From 5e2cec7b4de5b797e3af3a981a4c40c92c1aeb09 Mon Sep 17 00:00:00 2001 From: Solomon Hykes Date: Wed, 13 Feb 2013 14:58:32 -0800 Subject: [PATCH 1/5] Beefed up the README with down-to-earth material. Features, use cases, under the hood. --- README.md | 115 ++++++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 103 insertions(+), 12 deletions(-) diff --git a/README.md b/README.md index 3979c1e8d4..40cb55955b 100644 --- a/README.md +++ b/README.md @@ -3,31 +3,63 @@ Docker: a self-sufficient runtime for linux containers -Docker is a runtime for Standard Containers. More specifically, it is a daemon which automates the creation of and deployment of linux Standard Containers (SCs) via a remote API. +Docker is a process manager with superpowers. It is designed to run heterogeneous payloads on an heterogenous fleet of servers, with strong guarantees of isolation and repeatability. +It is designed to be used as a reliable building block for the automation of distributed systems: large web deployments, database clusters, continuous deployment, private PaaS, service-oriented architectures, etc. -Standard Containers are a fundamental unit of software delivery, in much the same way that shipping containers (http://bricks.argz.com/ins/7823-1/12) are a fundamental unit of physical delivery. +* Heterogeneous payloads: any combination of binaries, libraries, configuration files, scripts, virtualenvs, jars, gems, tarballs, you name it. No more juggling between domain-specific tools. Docker can deploy and run them all. + +* Heterogeneous set of servers: docker can run on any x64 machine with a modern linux kernel - whether it's a laptop, a bare metal server or a VM. This makes it perfect for multi-cloud deployments. + +* Isolation: docker isolates processes from each other and from the underlying host, using lightweight containers. + +* Repeatability: because containers start from a known filesystem state, and are highly isolated, their behavior will be the same regardless of where they run, when they run, and what else is running. -1. STANDARD OPERATIONS ----------------------- + +Notable features +----------------- + +* Filesystem isolation: each process container runs in a completely separate root filesystem. + +* Resource isolation: system resources like cpu and memory can be allocated differently to each process container, using cgroups. + +* Network isolation: each process container runs in its own network namespace, with a virtual interface and IP address of its own (COMING SOON) + +* Copy-on-write: root filesystems are created using copy-on-write, which makes deployment extremeley fast, memory-cheap and disk-cheap. + +* Logging: the standard streams (stdout/stderr/stdin) of each process container is collected and logged for real-time or batch retrieval. + +* Change management: changes to a container's filesystem can be committed into a new image and re-used to create more containers. No templating or manual configuration required. + +* Interactive shell: docker can allocate a pseudo-tty and attach to the standard input of any container, for example to run a throaway interactive shell. + + +What is a Standard Container? +----------------------------- + +Docker defines a unit of software delivery called a Standard Container. The goal of a Standard Container is to encapsulate a software component and all its dependencies in +a format that is self-describing and portable, so that any compliant runtime can run it without extra dependency, regardless of the underlying machine and the contents of the container. + +The spec for Standard Containers is currently work in progress, but it is very straightforward. It mostly defines 1) an image format, 2) a set of standard operations, and 3) an execution environment. + +A great analogy for this is the shipping container. Just like Standard Containers are a fundamental unit of software delivery, shipping containers (http://bricks.argz.com/ins/7823-1/12) are a fundamental unit of physical delivery. + +### 1. STANDARD OPERATIONS Just like shipping containers, Standard Containers define a set of STANDARD OPERATIONS. Shipping containers can be lifted, stacked, locked, loaded, unloaded and labelled. Similarly, standard containers can be started, stopped, copied, snapshotted, downloaded, uploaded and tagged. -2. CONTENT-AGNOSTIC ------------------- +### 2. CONTENT-AGNOSTIC Just like shipping containers, Standard Containers are CONTENT-AGNOSTIC: all standard operations have the same effect regardless of the contents. A shipping container will be stacked in exactly the same way whether it contains Vietnamese powder coffe or spare Maserati parts. Similarly, Standard Containers are started or uploaded in the same way whether they contain a postgres database, a php application with its dependencies and application server, or Java build artifacts. -3. INFRASTRUCTURE-AGNOSTIC --------------------------- +### 3. INFRASTRUCTURE-AGNOSTIC Both types of containers are INFRASTRUCTURE-AGNOSTIC: they can be transported to thousands of facilities around the world, and manipulated by a wide variety of equipment. A shipping container can be packed in a factory in Ukraine, transported by truck to the nearest routing center, stacked onto a train, loaded into a German boat by an Australian-built crane, stored in a warehouse at a US facility, etc. Similarly, a standard container can be bundled on my laptop, uploaded to S3, downloaded, run and snapshotted by a build server at Equinix in Virginia, uploaded to 10 staging servers in a home-made Openstack cluster, then sent to 30 production instances across 3 EC2 regions. -4. DESIGNED FOR AUTOMATION --------------------------- +### 4. DESIGNED FOR AUTOMATION Because they offer the same standard operations regardless of content and infrastructure, Standard Containers, just like their physical counterpart, are extremely well-suited for automation. In fact, you could say automation is their secret weapon. @@ -36,14 +68,73 @@ Many things that once required time-consuming and error-prone human effort can n Similarly, before Standard Containers, by the time a software component ran in production, it had been individually built, configured, bundled, documented, patched, vendored, templated, tweaked and instrumented by 10 different people on 10 different computers. Builds failed, libraries conflicted, mirrors crashed, post-it notes were lost, logs were misplaced, cluster updates were half-broken. The process was slow, inefficient and cost a fortune - and was entirely different depending on the language and infrastructure provider. -5. INDUSTRIAL-GRADE DELIVERY ----------------------------- +### 5. INDUSTRIAL-GRADE DELIVERY There are 17 million shipping containers in existence, packed with every physical good imaginable. Every single one of them can be loaded on the same boats, by the same cranes, in the same facilities, and sent anywhere in the World with incredible efficiency. It is embarrassing to think that a 30 ton shipment of coffee can safely travel half-way across the World in *less time* than it takes a software team to deliver its code from one datacenter to another sitting 10 miles away. With Standard Containers we can put an end to that embarrassment, by making INDUSTRIAL-GRADE DELIVERY of software a reality. + +Under the hood +-------------- + +Under the hood, Docker is built on the following components: + + +* The [cgroup](http://blog.dotcloud.com/kernel-secrets-from-the-paas-garage-part-24-c) and [namespacing](http://blog.dotcloud.com/under-the-hood-linux-kernels-on-dotcloud-part) capabilities of the Linux kernel; + +* [AUFS](http://aufs.sourceforge.net/aufs.html), a powerful union filesystem with copy-on-write capabilities; + +* The [Go](http://golang.org) programming language; + +* [lxc](http://lxc.sourceforge.net/), a set of convenience scripts to simplify the creation of linux containers. + + +Standard Container Specification +-------------------------------- + +(TODO) + +### Image format + + +### Standard operations + +* Copy +* Run +* Stop +* Wait +* Commit +* Attach standard streams +* List filesystem changes +* ... + +### Execution environment + +#### Root filesystem + +#### Environment variables + +#### Process arguments + +#### Networking + +#### Process namespacing + +#### Resource limits + +#### Process monitoring + +#### Logging + +#### Signals + +#### Pseudo-terminal allocation + +#### Security + + Setup instructions ================== From 0ea4f3cc765077559cd42f38dc24e71dfb330c29 Mon Sep 17 00:00:00 2001 From: Solomon Hykes Date: Wed, 13 Feb 2013 15:07:15 -0800 Subject: [PATCH 2/5] Fine-tuning the README --- README.md | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/README.md b/README.md index 40cb55955b..4266f977af 100644 --- a/README.md +++ b/README.md @@ -1,19 +1,19 @@ -Docker: a self-sufficient runtime for linux containers -====================================================== +Docker is a process manager with superpowers +============================================ -Docker is a process manager with superpowers. It is designed to run heterogeneous payloads on an heterogenous fleet of servers, with strong guarantees of isolation and repeatability. +Docker is a process manager with superpowers. It encapsulates heterogeneous payloads in Standard Containers, and runs them on any server with strong guarantees of isolation and repeatability. + It is designed to be used as a reliable building block for the automation of distributed systems: large web deployments, database clusters, continuous deployment, private PaaS, service-oriented architectures, etc. -* Heterogeneous payloads: any combination of binaries, libraries, configuration files, scripts, virtualenvs, jars, gems, tarballs, you name it. No more juggling between domain-specific tools. Docker can deploy and run them all. +* *Heterogeneous payloads*: any combination of binaries, libraries, configuration files, scripts, virtualenvs, jars, gems, tarballs, you name it. No more juggling between domain-specific tools. Docker can deploy and run them all. -* Heterogeneous set of servers: docker can run on any x64 machine with a modern linux kernel - whether it's a laptop, a bare metal server or a VM. This makes it perfect for multi-cloud deployments. +* *Any server*: docker can run on any x64 machine with a modern linux kernel - whether it's a laptop, a bare metal server or a VM. This makes it perfect for multi-cloud deployments. -* Isolation: docker isolates processes from each other and from the underlying host, using lightweight containers. - -* Repeatability: because containers start from a known filesystem state, and are highly isolated, their behavior will be the same regardless of where they run, when they run, and what else is running. +* *Isolation*: docker isolates processes from each other and from the underlying host, using lightweight containers. +* *Repeatability*: because containers are isolated in their own filesystem, they behave the same regardless of where, when, and alongside what they run. Notable features From 23e55d27555c07584fcd737d3f9a7fbb8c71eabf Mon Sep 17 00:00:00 2001 From: Solomon Hykes Date: Wed, 13 Feb 2013 15:10:39 -0800 Subject: [PATCH 3/5] More README tweaking --- README.md | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index 4266f977af..0764c60d6a 100644 --- a/README.md +++ b/README.md @@ -1,12 +1,12 @@ Docker is a process manager with superpowers ============================================ +It encapsulates heterogeneous payloads in Standard Containers, and runs them on any server with strong guarantees of isolation and repeatability. + +Is is a great building block for automating distributed systems: large-scale web deployments, database clusters, continuous deployment systems, private PaaS, service-oriented architectures, etc. + -Docker is a process manager with superpowers. It encapsulates heterogeneous payloads in Standard Containers, and runs them on any server with strong guarantees of isolation and repeatability. - -It is designed to be used as a reliable building block for the automation of distributed systems: large web deployments, database clusters, continuous deployment, private PaaS, service-oriented architectures, etc. - * *Heterogeneous payloads*: any combination of binaries, libraries, configuration files, scripts, virtualenvs, jars, gems, tarballs, you name it. No more juggling between domain-specific tools. Docker can deploy and run them all. * *Any server*: docker can run on any x64 machine with a modern linux kernel - whether it's a laptop, a bare metal server or a VM. This makes it perfect for multi-cloud deployments. From ffc8d1e7b97bd9fce380f310e18dcd1402c7c9ac Mon Sep 17 00:00:00 2001 From: Solomon Hykes Date: Wed, 13 Feb 2013 16:38:50 -0800 Subject: [PATCH 4/5] .gitignore --- .gitignore | 2 ++ 1 file changed, 2 insertions(+) create mode 100644 .gitignore diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000000..2b75f797f5 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +.*.swp +a.out From e1b25e9b084a2375640b811a27b75b89d57666d9 Mon Sep 17 00:00:00 2001 From: Solomon Hykes Date: Wed, 13 Feb 2013 17:10:00 -0800 Subject: [PATCH 5/5] Moved server and client logic into sub-packages docker/server and docker/client, respectively. The UI is not affected. --- client/client.go | 123 ++++ client/term.go | 145 +++++ {docker => client}/termios_darwin.go | 2 +- {docker => client}/termios_linux.go | 2 +- docker/docker.go | 274 +-------- dockerd/dockerd.go | 837 +------------------------- filesystem.go | 2 +- mount_darwin.go | 7 + mount_linux.go | 8 + server/server.go | 841 +++++++++++++++++++++++++++ 10 files changed, 1140 insertions(+), 1101 deletions(-) create mode 100644 client/client.go create mode 100644 client/term.go rename {docker => client}/termios_darwin.go (85%) rename {docker => client}/termios_linux.go (85%) create mode 100644 mount_darwin.go create mode 100644 mount_linux.go create mode 100644 server/server.go diff --git a/client/client.go b/client/client.go new file mode 100644 index 0000000000..6c5e6c4c99 --- /dev/null +++ b/client/client.go @@ -0,0 +1,123 @@ +package client + +import ( + "github.com/dotcloud/docker/rcli" + "github.com/dotcloud/docker/future" + "io" + "io/ioutil" + "log" + "os" + "os/exec" + "path" + "path/filepath" +) + +// Run docker in "simple mode": run a single command and return. +func SimpleMode(args []string) error { + var oldState *State + var err error + if IsTerminal(0) && os.Getenv("NORAW") == "" { + oldState, err = MakeRaw(0) + if err != nil { + return err + } + defer Restore(0, oldState) + } + // FIXME: we want to use unix sockets here, but net.UnixConn doesn't expose + // CloseWrite(), which we need to cleanly signal that stdin is closed without + // closing the connection. + // See http://code.google.com/p/go/issues/detail?id=3345 + conn, err := rcli.Call("tcp", "127.0.0.1:4242", args...) + if err != nil { + return err + } + receive_stdout := future.Go(func() error { + _, err := io.Copy(os.Stdout, conn) + return err + }) + send_stdin := future.Go(func() error { + _, err := io.Copy(conn, os.Stdin) + if err := conn.CloseWrite(); err != nil { + log.Printf("Couldn't send EOF: " + err.Error()) + } + return err + }) + if err := <-receive_stdout; err != nil { + return err + } + if oldState != nil { + Restore(0, oldState) + } + if !IsTerminal(0) { + if err := <-send_stdin; err != nil { + return err + } + } + return nil +} + +// Run docker in "interactive mode": run a bash-compatible shell capable of running docker commands. +func InteractiveMode(scripts ...string) error { + // Determine path of current docker binary + dockerPath, err := exec.LookPath(os.Args[0]) + if err != nil { + return err + } + dockerPath, err = filepath.Abs(dockerPath) + if err != nil { + return err + } + + // Create a temp directory + tmp, err := ioutil.TempDir("", "docker-shell") + if err != nil { + return err + } + defer os.RemoveAll(tmp) + + // For each command, create an alias in temp directory + // FIXME: generate this list dynamically with introspection of some sort + // It might make sense to merge docker and dockerd to keep that introspection + // within a single binary. + for _, cmd := range []string{ + "help", + "run", + "ps", + "pull", + "put", + "rm", + "kill", + "wait", + "stop", + "logs", + "diff", + "commit", + "attach", + "info", + "tar", + "web", + "images", + "docker", + } { + if err := os.Symlink(dockerPath, path.Join(tmp, cmd)); err != nil { + return err + } + } + + // Run $SHELL with PATH set to temp directory + rcfile, err := ioutil.TempFile("", "docker-shell-rc") + if err != nil { + return err + } + io.WriteString(rcfile, "enable -n help\n") + os.Setenv("PATH", tmp) + os.Setenv("PS1", "\\h docker> ") + shell := exec.Command("/bin/bash", append([]string{"--rcfile", rcfile.Name()}, scripts...)...) + shell.Stdin = os.Stdin + shell.Stdout = os.Stdout + shell.Stderr = os.Stderr + if err := shell.Run(); err != nil { + return err + } + return nil +} diff --git a/client/term.go b/client/term.go new file mode 100644 index 0000000000..8b58611cd9 --- /dev/null +++ b/client/term.go @@ -0,0 +1,145 @@ +package client + +import ( + "syscall" + "unsafe" +) + +type Termios struct { + Iflag uintptr + Oflag uintptr + Cflag uintptr + Lflag uintptr + Cc [20]byte + Ispeed uintptr + Ospeed uintptr +} + + +const ( + // Input flags + inpck = 0x010 + istrip = 0x020 + icrnl = 0x100 + ixon = 0x200 + + // Output flags + opost = 0x1 + + // Control flags + cs8 = 0x300 + + // Local flags + icanon = 0x100 + iexten = 0x400 +) + +const ( + HUPCL = 0x4000 + ICANON = 0x100 + ICRNL = 0x100 + IEXTEN = 0x400 + BRKINT = 0x2 + CFLUSH = 0xf + CLOCAL = 0x8000 + CREAD = 0x800 + CS5 = 0x0 + CS6 = 0x100 + CS7 = 0x200 + CS8 = 0x300 + CSIZE = 0x300 + CSTART = 0x11 + CSTATUS = 0x14 + CSTOP = 0x13 + CSTOPB = 0x400 + CSUSP = 0x1a + IGNBRK = 0x1 + IGNCR = 0x80 + IGNPAR = 0x4 + IMAXBEL = 0x2000 + INLCR = 0x40 + INPCK = 0x10 + ISIG = 0x80 + ISTRIP = 0x20 + IUTF8 = 0x4000 + IXANY = 0x800 + IXOFF = 0x400 + IXON = 0x200 + NOFLSH = 0x80000000 + OCRNL = 0x10 + OFDEL = 0x20000 + OFILL = 0x80 + ONLCR = 0x2 + ONLRET = 0x40 + ONOCR = 0x20 + ONOEOT = 0x8 + OPOST = 0x1 +RENB = 0x1000 + PARMRK = 0x8 + PARODD = 0x2000 + + TOSTOP = 0x400000 + VDISCARD = 0xf + VDSUSP = 0xb + VEOF = 0x0 + VEOL = 0x1 + VEOL2 = 0x2 + VERASE = 0x3 + VINTR = 0x8 + VKILL = 0x5 + VLNEXT = 0xe + VMIN = 0x10 + VQUIT = 0x9 + VREPRINT = 0x6 + VSTART = 0xc + VSTATUS = 0x12 + VSTOP = 0xd + VSUSP = 0xa + VT0 = 0x0 + VT1 = 0x10000 + VTDLY = 0x10000 + VTIME = 0x11 + ECHO = 0x00000008 + + PENDIN = 0x20000000 +) + +type State struct { + termios Termios +} + +// IsTerminal returns true if the given file descriptor is a terminal. +func IsTerminal(fd int) bool { + var termios Termios + _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(getTermios), uintptr(unsafe.Pointer(&termios)), 0, 0, 0) + return err == 0 +} + +// MakeRaw put the terminal connected to the given file descriptor into raw +// mode and returns the previous state of the terminal so that it can be +// restored. +func MakeRaw(fd int) (*State, error) { + var oldState State + if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(getTermios), uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 { + return nil, err + } + + newState := oldState.termios + newState.Iflag &^= istrip | INLCR | ICRNL | IGNCR | IXON | IXOFF + newState.Lflag &^= ECHO | ICANON | ISIG + if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(setTermios), uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 { + return nil, err + } + + return &oldState, nil +} + + +// Restore restores the terminal connected to the given file descriptor to a +// previous state. +func Restore(fd int, state *State) error { + _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(setTermios), uintptr(unsafe.Pointer(&state.termios)), 0, 0, 0) + return err +} + + diff --git a/docker/termios_darwin.go b/client/termios_darwin.go similarity index 85% rename from docker/termios_darwin.go rename to client/termios_darwin.go index ba3aac0f4a..185687920c 100644 --- a/docker/termios_darwin.go +++ b/client/termios_darwin.go @@ -1,4 +1,4 @@ -package main +package client import "syscall" diff --git a/docker/termios_linux.go b/client/termios_linux.go similarity index 85% rename from docker/termios_linux.go rename to client/termios_linux.go index 882dee1276..36957c44a1 100644 --- a/docker/termios_linux.go +++ b/client/termios_linux.go @@ -1,4 +1,4 @@ -package main +package client import "syscall" diff --git a/docker/docker.go b/docker/docker.go index 973c2623ea..efc93620a4 100644 --- a/docker/docker.go +++ b/docker/docker.go @@ -1,288 +1,30 @@ package main import ( - "github.com/dotcloud/docker/rcli" - "github.com/dotcloud/docker/future" - "io" - "io/ioutil" + "flag" "log" "os" - "os/exec" - "syscall" - "unsafe" "path" - "path/filepath" - "flag" + "github.com/dotcloud/docker/client" ) - -type Termios struct { - Iflag uintptr - Oflag uintptr - Cflag uintptr - Lflag uintptr - Cc [20]byte - Ispeed uintptr - Ospeed uintptr -} - - -const ( - // Input flags - inpck = 0x010 - istrip = 0x020 - icrnl = 0x100 - ixon = 0x200 - - // Output flags - opost = 0x1 - - // Control flags - cs8 = 0x300 - - // Local flags - icanon = 0x100 - iexten = 0x400 -) - -const ( - HUPCL = 0x4000 - ICANON = 0x100 - ICRNL = 0x100 - IEXTEN = 0x400 - BRKINT = 0x2 - CFLUSH = 0xf - CLOCAL = 0x8000 - CREAD = 0x800 - CS5 = 0x0 - CS6 = 0x100 - CS7 = 0x200 - CS8 = 0x300 - CSIZE = 0x300 - CSTART = 0x11 - CSTATUS = 0x14 - CSTOP = 0x13 - CSTOPB = 0x400 - CSUSP = 0x1a - IGNBRK = 0x1 - IGNCR = 0x80 - IGNPAR = 0x4 - IMAXBEL = 0x2000 - INLCR = 0x40 - INPCK = 0x10 - ISIG = 0x80 - ISTRIP = 0x20 - IUTF8 = 0x4000 - IXANY = 0x800 - IXOFF = 0x400 - IXON = 0x200 - NOFLSH = 0x80000000 - OCRNL = 0x10 - OFDEL = 0x20000 - OFILL = 0x80 - ONLCR = 0x2 - ONLRET = 0x40 - ONOCR = 0x20 - ONOEOT = 0x8 - OPOST = 0x1 -RENB = 0x1000 - PARMRK = 0x8 - PARODD = 0x2000 - - TOSTOP = 0x400000 - VDISCARD = 0xf - VDSUSP = 0xb - VEOF = 0x0 - VEOL = 0x1 - VEOL2 = 0x2 - VERASE = 0x3 - VINTR = 0x8 - VKILL = 0x5 - VLNEXT = 0xe - VMIN = 0x10 - VQUIT = 0x9 - VREPRINT = 0x6 - VSTART = 0xc - VSTATUS = 0x12 - VSTOP = 0xd - VSUSP = 0xa - VT0 = 0x0 - VT1 = 0x10000 - VTDLY = 0x10000 - VTIME = 0x11 - ECHO = 0x00000008 - - PENDIN = 0x20000000 -) - -type State struct { - termios Termios -} - -// IsTerminal returns true if the given file descriptor is a terminal. -func IsTerminal(fd int) bool { - var termios Termios - _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(getTermios), uintptr(unsafe.Pointer(&termios)), 0, 0, 0) - return err == 0 -} - -// MakeRaw put the terminal connected to the given file descriptor into raw -// mode and returns the previous state of the terminal so that it can be -// restored. -func MakeRaw(fd int) (*State, error) { - var oldState State - if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(getTermios), uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 { - return nil, err - } - - newState := oldState.termios - newState.Iflag &^= istrip | INLCR | ICRNL | IGNCR | IXON | IXOFF - newState.Lflag &^= ECHO | ICANON | ISIG - if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(setTermios), uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 { - return nil, err - } - - return &oldState, nil -} - - -// Restore restores the terminal connected to the given file descriptor to a -// previous state. -func Restore(fd int, state *State) error { - _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(setTermios), uintptr(unsafe.Pointer(&state.termios)), 0, 0, 0) - return err -} - -var oldState *State - -func Fatal(err error) { - if oldState != nil { - Restore(0, oldState) - } - log.Fatal(err) -} - - func main() { if cmd := path.Base(os.Args[0]); cmd == "docker" { fl_shell := flag.Bool("i", false, "Interactive mode") flag.Parse() if *fl_shell { - if err := InteractiveMode(flag.Args()...); err != nil { + if err := client.InteractiveMode(flag.Args()...); err != nil { log.Fatal(err) } } else { - SimpleMode(os.Args[1:]) + if err := client.SimpleMode(os.Args[1:]); err != nil { + log.Fatal(err) + } } } else { - SimpleMode(append([]string{cmd}, os.Args[1:]...)) - } -} - -// Run docker in "simple mode": run a single command and return. -func SimpleMode(args []string) { - var err error - if IsTerminal(0) && os.Getenv("NORAW") == "" { - oldState, err = MakeRaw(0) - if err != nil { - panic(err) - } - defer Restore(0, oldState) - } - // FIXME: we want to use unix sockets here, but net.UnixConn doesn't expose - // CloseWrite(), which we need to cleanly signal that stdin is closed without - // closing the connection. - // See http://code.google.com/p/go/issues/detail?id=3345 - conn, err := rcli.Call("tcp", "127.0.0.1:4242", args...) - if err != nil { - Fatal(err) - } - receive_stdout := future.Go(func() error { - _, err := io.Copy(os.Stdout, conn) - return err - }) - send_stdin := future.Go(func() error { - _, err := io.Copy(conn, os.Stdin) - if err := conn.CloseWrite(); err != nil { - log.Printf("Couldn't send EOF: " + err.Error()) - } - return err - }) - if err := <-receive_stdout; err != nil { - Fatal(err) - } - if oldState != nil { - Restore(0, oldState) - } - if !IsTerminal(0) { - if err := <-send_stdin; err != nil { - Fatal(err) + if err := client.SimpleMode(append([]string{cmd}, os.Args[1:]...)); err != nil { + log.Fatal(err) } } } -// Run docker in "interactive mode": run a bash-compatible shell capable of running docker commands. -func InteractiveMode(scripts ...string) error { - // Determine path of current docker binary - dockerPath, err := exec.LookPath(os.Args[0]) - if err != nil { - return err - } - dockerPath, err = filepath.Abs(dockerPath) - if err != nil { - return err - } - - // Create a temp directory - tmp, err := ioutil.TempDir("", "docker-shell") - if err != nil { - return err - } - defer os.RemoveAll(tmp) - - // For each command, create an alias in temp directory - // FIXME: generate this list dynamically with introspection of some sort - // It might make sense to merge docker and dockerd to keep that introspection - // within a single binary. - for _, cmd := range []string{ - "help", - "run", - "ps", - "pull", - "put", - "rm", - "kill", - "wait", - "stop", - "logs", - "diff", - "commit", - "attach", - "info", - "tar", - "web", - "images", - "docker", - } { - if err := os.Symlink(dockerPath, path.Join(tmp, cmd)); err != nil { - return err - } - } - - // Run $SHELL with PATH set to temp directory - rcfile, err := ioutil.TempFile("", "docker-shell-rc") - if err != nil { - return err - } - io.WriteString(rcfile, "enable -n help\n") - os.Setenv("PATH", tmp) - os.Setenv("PS1", "\\h docker> ") - shell := exec.Command("/bin/bash", append([]string{"--rcfile", rcfile.Name()}, scripts...)...) - shell.Stdin = os.Stdin - shell.Stdout = os.Stdout - shell.Stderr = os.Stderr - if err := shell.Run(); err != nil { - return err - } - return nil -} diff --git a/dockerd/dockerd.go b/dockerd/dockerd.go index 41a81f19d5..744964cf73 100644 --- a/dockerd/dockerd.go +++ b/dockerd/dockerd.go @@ -1,851 +1,24 @@ package main import ( - "bufio" - "bytes" - "encoding/json" - "errors" - "flag" - "fmt" - "github.com/dotcloud/docker" - "github.com/dotcloud/docker/future" - "github.com/dotcloud/docker/image" - "github.com/dotcloud/docker/rcli" - "io" "log" - "net/http" - "net/url" - "os" - "path" - "strings" - "sync" - "text/tabwriter" - "time" + "flag" + "github.com/dotcloud/docker/server" + "github.com/dotcloud/docker" ) -const VERSION = "0.0.1" - -func (srv *Server) Name() string { - return "docker" -} - -func (srv *Server) Help() string { - help := "Usage: docker COMMAND [arg...]\n\nA self-sufficient runtime for linux containers.\n\nCommands:\n" - for _, cmd := range [][]interface{}{ - {"run", "Run a command in a container"}, - {"ps", "Display a list of containers"}, - {"pull", "Download a tarball and create a container from it"}, - {"put", "Upload a tarball and create a container from it"}, - {"rm", "Remove containers"}, - {"kill", "Kill a running container"}, - {"wait", "Wait for the state of a container to change"}, - {"stop", "Stop a running container"}, - {"logs", "Fetch the logs of a container"}, - {"diff", "Inspect changes on a container's filesystem"}, - {"commit", "Save the state of a container"}, - {"attach", "Attach to the standard inputs and outputs of a running container"}, - {"info", "Display system-wide information"}, - {"tar", "Stream the contents of a container as a tar archive"}, - {"web", "Generate a web UI"}, - {"images", "List images"}, - } { - help += fmt.Sprintf(" %-10.10s%s\n", cmd...) - } - return help -} - -// 'docker info': display system-wide information. -func (srv *Server) CmdInfo(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - fmt.Fprintf(stdout, "containers: %d\nversion: %s\nimages: %d\n", - len(srv.containers.List()), - VERSION, - len(srv.images.ById)) - return nil -} - -func (srv *Server) CmdStop(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "stop", "[OPTIONS] NAME", "Stop a running container") - if err := cmd.Parse(args); err != nil { - cmd.Usage() - return nil - } - if cmd.NArg() < 1 { - cmd.Usage() - return nil - } - for _, name := range cmd.Args() { - if container := srv.containers.Get(name); container != nil { - if err := container.Stop(); err != nil { - return err - } - fmt.Fprintln(stdout, container.Id) - } else { - return errors.New("No such container: " + name) - } - } - return nil -} - -func (srv *Server) CmdUmount(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "umount", "[OPTIONS] NAME", "umount a container's filesystem (debug only)") - if err := cmd.Parse(args); err != nil { - cmd.Usage() - return nil - } - if cmd.NArg() < 1 { - cmd.Usage() - return nil - } - for _, name := range cmd.Args() { - if container := srv.containers.Get(name); container != nil { - if err := container.Filesystem.Umount(); err != nil { - return err - } - fmt.Fprintln(stdout, container.Id) - } else { - return errors.New("No such container: " + name) - } - } - return nil -} - -func (srv *Server) CmdMount(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "umount", "[OPTIONS] NAME", "mount a container's filesystem (debug only)") - if err := cmd.Parse(args); err != nil { - cmd.Usage() - return nil - } - if cmd.NArg() < 1 { - cmd.Usage() - return nil - } - for _, name := range cmd.Args() { - if container := srv.containers.Get(name); container != nil { - if err := container.Filesystem.Mount(); err != nil { - return err - } - fmt.Fprintln(stdout, container.Id) - } else { - return errors.New("No such container: " + name) - } - } - return nil -} - -func (srv *Server) CmdCat(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "cat", "[OPTIONS] CONTAINER PATH", "write the contents of a container's file to standard output") - if err := cmd.Parse(args); err != nil { - cmd.Usage() - return nil - } - if cmd.NArg() < 2 { - cmd.Usage() - return nil - } - name, path := cmd.Arg(0), cmd.Arg(1) - if container := srv.containers.Get(name); container != nil { - if f, err := container.Filesystem.OpenFile(path, os.O_RDONLY, 0); err != nil { - return err - } else if _, err := io.Copy(stdout, f); err != nil { - return err - } - return nil - } - return errors.New("No such container: " + name) -} - -func (srv *Server) CmdWrite(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "write", "[OPTIONS] CONTAINER PATH", "write the contents of standard input to a container's file") - if err := cmd.Parse(args); err != nil { - cmd.Usage() - return nil - } - if cmd.NArg() < 2 { - cmd.Usage() - return nil - } - name, path := cmd.Arg(0), cmd.Arg(1) - if container := srv.containers.Get(name); container != nil { - if f, err := container.Filesystem.OpenFile(path, os.O_WRONLY|os.O_CREATE, 0600); err != nil { - return err - } else if _, err := io.Copy(f, stdin); err != nil { - return err - } - return nil - } - return errors.New("No such container: " + name) -} - -func (srv *Server) CmdLs(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "ls", "[OPTIONS] CONTAINER PATH", "List the contents of a container's directory") - if err := cmd.Parse(args); err != nil { - cmd.Usage() - return nil - } - if cmd.NArg() < 2 { - cmd.Usage() - return nil - } - name, path := cmd.Arg(0), cmd.Arg(1) - if container := srv.containers.Get(name); container != nil { - if files, err := container.Filesystem.ReadDir(path); err != nil { - return err - } else { - for _, f := range files { - fmt.Fprintln(stdout, f.Name()) - } - } - return nil - } - return errors.New("No such container: " + name) -} - -func (srv *Server) CmdInspect(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "inspect", "[OPTIONS] CONTAINER", "Return low-level information on a container") - if err := cmd.Parse(args); err != nil { - cmd.Usage() - return nil - } - if cmd.NArg() < 1 { - cmd.Usage() - return nil - } - name := cmd.Arg(0) - var obj interface{} - if container := srv.containers.Get(name); container != nil { - obj = container - } else if image := srv.images.Find(name); image != nil { - obj = image - } else { - return errors.New("No such container or image: " + name) - } - data, err := json.Marshal(obj) - if err != nil { - return err - } - indented := new(bytes.Buffer) - if err = json.Indent(indented, data, "", " "); err != nil { - return err - } - if _, err := io.Copy(stdout, indented); err != nil { - return err - } - return nil -} - -// 'docker rmi NAME' removes all images with the name NAME -func (srv *Server) CmdRmi(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "rmimage", "[OPTIONS] IMAGE", "Remove an image") - if err := cmd.Parse(args); err != nil { - cmd.Usage() - return nil - } - if cmd.NArg() < 1 { - cmd.Usage() - return nil - } - for _, name := range cmd.Args() { - image := srv.images.Find(name) - if image == nil { - return errors.New("No such image: " + name) - } - if err := srv.images.Delete(name); err != nil { - return err - } - } - return nil -} - -func (srv *Server) CmdRm(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "rm", "[OPTIONS] CONTAINER", "Remove a container") - if err := cmd.Parse(args); err != nil { - return nil - } - for _, name := range cmd.Args() { - container := srv.containers.Get(name) - if container == nil { - return errors.New("No such container: " + name) - } - if err := srv.containers.Destroy(container); err != nil { - fmt.Fprintln(stdout, "Error destroying container "+name+": "+err.Error()) - } - } - return nil -} - -// 'docker kill NAME' kills a running container -func (srv *Server) CmdKill(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "kill", "[OPTIONS] CONTAINER [CONTAINER...]", "Kill a running container") - if err := cmd.Parse(args); err != nil { - return nil - } - for _, name := range cmd.Args() { - container := srv.containers.Get(name) - if container == nil { - return errors.New("No such container: " + name) - } - if err := container.Kill(); err != nil { - fmt.Fprintln(stdout, "Error killing container "+name+": "+err.Error()) - } - } - return nil -} - -func (srv *Server) CmdPull(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "pull", "[OPTIONS] NAME", "Download a new image from a remote location") - fl_bzip2 := cmd.Bool("j", false, "Bzip2 compression") - fl_gzip := cmd.Bool("z", false, "Gzip compression") - if err := cmd.Parse(args); err != nil { - return nil - } - var compression image.Compression - if *fl_bzip2 { - compression = image.Bzip2 - } else if *fl_gzip { - compression = image.Gzip - } - name := cmd.Arg(0) - if name == "" { - return errors.New("Not enough arguments") - } - u, err := url.Parse(name) - if err != nil { - return err - } - if u.Scheme == "" { - u.Scheme = "http" - } - // FIXME: hardcode a mirror URL that does not depend on a single provider. - if u.Host == "" { - u.Host = "s3.amazonaws.com" - u.Path = path.Join("/docker.io/images", u.Path) - } - fmt.Fprintf(stdout, "Downloading %s from %s...\n", name, u.String()) - resp, err := http.Get(u.String()) - if err != nil { - return err - } - img, err := srv.images.Import(name, resp.Body, stdout, nil, compression) - if err != nil { - return err - } - fmt.Fprintln(stdout, img.Id) - return nil -} - -func (srv *Server) CmdPut(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "put", "[OPTIONS] NAME", "Import a new image from a local archive.") - fl_bzip2 := cmd.Bool("j", false, "Bzip2 compression") - fl_gzip := cmd.Bool("z", false, "Gzip compression") - if err := cmd.Parse(args); err != nil { - return nil - } - var compression image.Compression - if *fl_bzip2 { - compression = image.Bzip2 - } else if *fl_gzip { - compression = image.Gzip - } - name := cmd.Arg(0) - if name == "" { - return errors.New("Not enough arguments") - } - img, err := srv.images.Import(name, stdin, stdout, nil, compression) - if err != nil { - return err - } - fmt.Fprintln(stdout, img.Id) - return nil -} - -func (srv *Server) CmdImages(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "images", "[OPTIONS] [NAME]", "List images") - limit := cmd.Int("l", 0, "Only show the N most recent versions of each image") - quiet := cmd.Bool("q", false, "only show numeric IDs") - cmd.Parse(args) - if cmd.NArg() > 1 { - cmd.Usage() - return nil - } - var nameFilter string - if cmd.NArg() == 1 { - nameFilter = cmd.Arg(0) - } - w := tabwriter.NewWriter(stdout, 20, 1, 3, ' ', 0) - if !*quiet { - fmt.Fprintf(w, "NAME\tID\tCREATED\tPARENT\n") - } - for _, name := range srv.images.Names() { - if nameFilter != "" && nameFilter != name { - continue - } - for idx, img := range *srv.images.ByName[name] { - if *limit > 0 && idx >= *limit { - break - } - if !*quiet { - id := img.Id - if !img.IdIsFinal() { - id += "..." - } - for idx, field := range []string{ - /* NAME */ name, - /* ID */ id, - /* CREATED */ future.HumanDuration(time.Now().Sub(img.Created)) + " ago", - /* PARENT */ img.Parent, - } { - if idx == 0 { - w.Write([]byte(field)) - } else { - w.Write([]byte("\t" + field)) - } - } - w.Write([]byte{'\n'}) - } else { - stdout.Write([]byte(img.Id + "\n")) - } - } - } - if !*quiet { - w.Flush() - } - return nil - -} - -func (srv *Server) CmdPs(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, - "ps", "[OPTIONS]", "List containers") - quiet := cmd.Bool("q", false, "Only display numeric IDs") - fl_all := cmd.Bool("a", false, "Show all containers. Only running containers are shown by default.") - fl_full := cmd.Bool("notrunc", false, "Don't truncate output") - if err := cmd.Parse(args); err != nil { - return nil - } - w := tabwriter.NewWriter(stdout, 12, 1, 3, ' ', 0) - if !*quiet { - fmt.Fprintf(w, "ID\tIMAGE\tCOMMAND\tCREATED\tSTATUS\tCOMMENT\n") - } - for _, container := range srv.containers.List() { - comment := container.GetUserData("comment") - if !container.State.Running && !*fl_all { - continue - } - if !*quiet { - command := fmt.Sprintf("%s %s", container.Path, strings.Join(container.Args, " ")) - if !*fl_full { - command = docker.Trunc(command, 20) - } - for idx, field := range []string{ - /* ID */ container.Id, - /* IMAGE */ container.GetUserData("image"), - /* COMMAND */ command, - /* CREATED */ future.HumanDuration(time.Now().Sub(container.Created)) + " ago", - /* STATUS */ container.State.String(), - /* COMMENT */ comment, - } { - if idx == 0 { - w.Write([]byte(field)) - } else { - w.Write([]byte("\t" + field)) - } - } - w.Write([]byte{'\n'}) - } else { - stdout.Write([]byte(container.Id + "\n")) - } - } - if !*quiet { - w.Flush() - } - return nil -} - -func (srv *Server) CmdLayers(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, - "layers", "[OPTIONS]", - "List filesystem layers (debug only)") - if err := cmd.Parse(args); err != nil { - return nil - } - for _, layer := range srv.images.Layers.List() { - fmt.Fprintln(stdout, layer) - } - return nil -} - -func (srv *Server) CmdCp(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, - "cp", "[OPTIONS] IMAGE NAME", - "Create a copy of IMAGE and call it NAME") - if err := cmd.Parse(args); err != nil { - return nil - } - if newImage, err := srv.images.Copy(cmd.Arg(0), cmd.Arg(1)); err != nil { - return err - } else { - fmt.Fprintln(stdout, newImage.Id) - } - return nil -} - -func (srv *Server) CmdCommit(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, - "commit", "[OPTIONS] CONTAINER [DEST]", - "Create a new image from a container's changes") - if err := cmd.Parse(args); err != nil { - return nil - } - containerName, imgName := cmd.Arg(0), cmd.Arg(1) - if containerName == "" || imgName == "" { - cmd.Usage() - return nil - } - if container := srv.containers.Get(containerName); container != nil { - // FIXME: freeze the container before copying it to avoid data corruption? - rwTar, err := docker.Tar(container.Filesystem.RWPath) - if err != nil { - return err - } - // Create a new image from the container's base layers + a new layer from container changes - parentImg := srv.images.Find(container.GetUserData("image")) - img, err := srv.images.Import(imgName, rwTar, stdout, parentImg, image.Uncompressed) - if err != nil { - return err - } - fmt.Fprintln(stdout, img.Id) - return nil - } - return errors.New("No such container: " + containerName) -} - -func (srv *Server) CmdTar(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, - "tar", "CONTAINER", - "Stream the contents of a container as a tar archive") - fl_sparse := cmd.Bool("s", false, "Generate a sparse tar stream (top layer + reference to bottom layers)") - if err := cmd.Parse(args); err != nil { - return nil - } - if *fl_sparse { - return errors.New("Sparse mode not yet implemented") // FIXME - } - name := cmd.Arg(0) - if container := srv.containers.Get(name); container != nil { - data, err := container.Filesystem.Tar() - if err != nil { - return err - } - // Stream the entire contents of the container (basically a volatile snapshot) - if _, err := io.Copy(stdout, data); err != nil { - return err - } - return nil - } - return errors.New("No such container: " + name) -} - -func (srv *Server) CmdDiff(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, - "diff", "CONTAINER [OPTIONS]", - "Inspect changes on a container's filesystem") - if err := cmd.Parse(args); err != nil { - return nil - } - if cmd.NArg() < 1 { - return errors.New("Not enough arguments") - } - if container := srv.containers.Get(cmd.Arg(0)); container == nil { - return errors.New("No such container") - } else { - changes, err := container.Filesystem.Changes() - if err != nil { - return err - } - for _, change := range changes { - fmt.Fprintln(stdout, change.String()) - } - } - return nil -} - -func (srv *Server) CmdReset(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, - "reset", "CONTAINER [OPTIONS]", - "Reset changes to a container's filesystem") - if err := cmd.Parse(args); err != nil { - return nil - } - if cmd.NArg() < 1 { - return errors.New("Not enough arguments") - } - for _, name := range cmd.Args() { - if container := srv.containers.Get(name); container != nil { - if err := container.Filesystem.Reset(); err != nil { - return errors.New("Reset " + container.Id + ": " + err.Error()) - } - } - } - return nil -} - -func (srv *Server) CmdLogs(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "logs", "[OPTIONS] CONTAINER", "Fetch the logs of a container") - if err := cmd.Parse(args); err != nil { - return nil - } - if cmd.NArg() != 1 { - cmd.Usage() - return nil - } - name := cmd.Arg(0) - if container := srv.containers.Get(name); container != nil { - if _, err := io.Copy(stdout, container.StdoutLog()); err != nil { - return err - } - if _, err := io.Copy(stdout, container.StderrLog()); err != nil { - return err - } - return nil - } - return errors.New("No such container: " + cmd.Arg(0)) -} - -func (srv *Server) CreateContainer(img *image.Image, tty bool, openStdin bool, comment string, cmd string, args ...string) (*docker.Container, error) { - id := future.RandomId()[:8] - container, err := srv.containers.Create(id, cmd, args, img.Layers, - &docker.Config{Hostname: id, Tty: tty, OpenStdin: openStdin}) - if err != nil { - return nil, err - } - if err := container.SetUserData("image", img.Id); err != nil { - srv.containers.Destroy(container) - return nil, errors.New("Error setting container userdata: " + err.Error()) - } - if err := container.SetUserData("comment", comment); err != nil { - srv.containers.Destroy(container) - return nil, errors.New("Error setting container userdata: " + err.Error()) - } - return container, nil -} - -func (srv *Server) CmdAttach(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "attach", "[OPTIONS]", "Attach to a running container") - fl_i := cmd.Bool("i", false, "Attach to stdin") - fl_o := cmd.Bool("o", true, "Attach to stdout") - fl_e := cmd.Bool("e", true, "Attach to stderr") - if err := cmd.Parse(args); err != nil { - return nil - } - if cmd.NArg() != 1 { - cmd.Usage() - return nil - } - name := cmd.Arg(0) - container := srv.containers.Get(name) - if container == nil { - return errors.New("No such container: " + name) - } - var wg sync.WaitGroup - if *fl_i { - c_stdin, err := container.StdinPipe() - if err != nil { - return err - } - wg.Add(1) - go func() { io.Copy(c_stdin, stdin); wg.Add(-1) }() - } - if *fl_o { - c_stdout, err := container.StdoutPipe() - if err != nil { - return err - } - wg.Add(1) - go func() { io.Copy(stdout, c_stdout); wg.Add(-1) }() - } - if *fl_e { - c_stderr, err := container.StderrPipe() - if err != nil { - return err - } - wg.Add(1) - go func() { io.Copy(stdout, c_stderr); wg.Add(-1) }() - } - wg.Wait() - return nil -} - -func (srv *Server) CmdRun(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "run", "[OPTIONS] IMAGE COMMAND [ARG...]", "Run a command in a new container") - fl_attach := cmd.Bool("a", false, "Attach stdin and stdout") - fl_stdin := cmd.Bool("i", false, "Keep stdin open even if not attached") - fl_tty := cmd.Bool("t", false, "Allocate a pseudo-tty") - fl_comment := cmd.String("c", "", "Comment") - if err := cmd.Parse(args); err != nil { - return nil - } - name := cmd.Arg(0) - var cmdline []string - if len(cmd.Args()) >= 2 { - cmdline = cmd.Args()[1:] - } - // Choose a default image if needed - if name == "" { - name = "base" - } - // Choose a default command if needed - if len(cmdline) == 0 { - *fl_stdin = true - *fl_tty = true - *fl_attach = true - cmdline = []string{"/bin/bash", "-i"} - } - // Find the image - img := srv.images.Find(name) - if img == nil { - return errors.New("No such image: " + name) - } - // Create new container - container, err := srv.CreateContainer(img, *fl_tty, *fl_stdin, *fl_comment, cmdline[0], cmdline[1:]...) - if err != nil { - return errors.New("Error creating container: " + err.Error()) - } - if *fl_stdin { - cmd_stdin, err := container.StdinPipe() - if err != nil { - return err - } - if *fl_attach { - future.Go(func() error { - log.Printf("CmdRun(): start receiving stdin\n") - _, err := io.Copy(cmd_stdin, stdin) - log.Printf("CmdRun(): done receiving stdin\n") - cmd_stdin.Close() - return err - }) - } - } - // Run the container - if *fl_attach { - cmd_stderr, err := container.StderrPipe() - if err != nil { - return err - } - cmd_stdout, err := container.StdoutPipe() - if err != nil { - return err - } - if err := container.Start(); err != nil { - return err - } - sending_stdout := future.Go(func() error { - _, err := io.Copy(stdout, cmd_stdout) - return err - }) - sending_stderr := future.Go(func() error { - _, err := io.Copy(stdout, cmd_stderr) - return err - }) - err_sending_stdout := <-sending_stdout - err_sending_stderr := <-sending_stderr - if err_sending_stdout != nil { - return err_sending_stdout - } - if err_sending_stderr != nil { - return err_sending_stderr - } - container.Wait() - } else { - if err := container.Start(); err != nil { - return err - } - fmt.Fprintln(stdout, container.Id) - } - return nil -} - func main() { if docker.SelfPath() == "/sbin/init" { // Running in init mode docker.SysInit() return } - future.Seed() flag.Parse() - d, err := New() + d, err := server.New() if err != nil { log.Fatal(err) } - go func() { - if err := rcli.ListenAndServeHTTP("127.0.0.1:8080", d); err != nil { - log.Fatal(err) - } - }() - // FIXME: we want to use unix sockets here, but net.UnixConn doesn't expose - // CloseWrite(), which we need to cleanly signal that stdin is closed without - // closing the connection. - // See http://code.google.com/p/go/issues/detail?id=3345 - if err := rcli.ListenAndServe("tcp", "127.0.0.1:4242", d); err != nil { + if err := d.ListenAndServe(); err != nil { log.Fatal(err) } } - -func New() (*Server, error) { - images, err := image.New("/var/lib/docker/images") - if err != nil { - return nil, err - } - containers, err := docker.New() - if err != nil { - return nil, err - } - srv := &Server{ - images: images, - containers: containers, - } - return srv, nil -} - -func (srv *Server) CmdMirror(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - _, err := io.Copy(stdout, stdin) - return err -} - -func (srv *Server) CmdDebug(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - for { - if line, err := bufio.NewReader(stdin).ReadString('\n'); err == nil { - fmt.Printf("--- %s", line) - } else if err == io.EOF { - if len(line) > 0 { - fmt.Printf("--- %s\n", line) - } - break - } else { - return err - } - } - return nil -} - -func (srv *Server) CmdWeb(stdin io.ReadCloser, stdout io.Writer, args ...string) error { - cmd := rcli.Subcmd(stdout, "web", "[OPTIONS]", "A web UI for docker") - showurl := cmd.Bool("u", false, "Return the URL of the web UI") - if err := cmd.Parse(args); err != nil { - return nil - } - if *showurl { - fmt.Fprintln(stdout, "http://localhost:4242/web") - } else { - if file, err := os.Open("dockerweb.html"); err != nil { - return err - } else if _, err := io.Copy(stdout, file); err != nil { - return err - } - } - return nil -} - -type Server struct { - containers *docker.Docker - images *image.Store -} diff --git a/filesystem.go b/filesystem.go index f73fe38d26..c775fa0c18 100644 --- a/filesystem.go +++ b/filesystem.go @@ -44,7 +44,7 @@ func (fs *Filesystem) Mount() error { roBranches += fmt.Sprintf("%v=ro:", layer) } branches := fmt.Sprintf("br:%v:%v", rwBranch, roBranches) - if err := syscall.Mount("none", fs.RootFS, "aufs", 0, branches); err != nil { + if err := mount("none", fs.RootFS, "aufs", 0, branches); err != nil { return err } if !fs.IsMounted() { diff --git a/mount_darwin.go b/mount_darwin.go new file mode 100644 index 0000000000..aeac78cda5 --- /dev/null +++ b/mount_darwin.go @@ -0,0 +1,7 @@ +package docker + +import "errors" + +func mount(source string, target string, fstype string, flags uintptr, data string) (err error) { + return errors.New("mount is not implemented on darwin") +} diff --git a/mount_linux.go b/mount_linux.go new file mode 100644 index 0000000000..a5a24e8480 --- /dev/null +++ b/mount_linux.go @@ -0,0 +1,8 @@ +package docker + +import "syscall" + + +func mount(source string, target string, fstype string, flags uintptr, data string) (err error) { + return syscall.Mount(source, target, fstype, flags, data) +} diff --git a/server/server.go b/server/server.go new file mode 100644 index 0000000000..e5dcac0ab5 --- /dev/null +++ b/server/server.go @@ -0,0 +1,841 @@ +package server + +import ( + "github.com/dotcloud/docker" + "github.com/dotcloud/docker/rcli" + "github.com/dotcloud/docker/image" + "github.com/dotcloud/docker/future" + "bufio" + "errors" + "log" + "io" + "fmt" + "strings" + "text/tabwriter" + "os" + "time" + "net/http" + "encoding/json" + "bytes" + "sync" + "net/url" + "path" +) + +const VERSION = "0.0.1" + +func (srv *Server) ListenAndServe() error { + go rcli.ListenAndServeHTTP("127.0.0.1:8080", srv) + // FIXME: we want to use unix sockets here, but net.UnixConn doesn't expose + // CloseWrite(), which we need to cleanly signal that stdin is closed without + // closing the connection. + // See http://code.google.com/p/go/issues/detail?id=3345 + return rcli.ListenAndServe("tcp", "127.0.0.1:4242", srv) +} + +func (srv *Server) Name() string { + return "docker" +} + +func (srv *Server) Help() string { + help := "Usage: docker COMMAND [arg...]\n\nA self-sufficient runtime for linux containers.\n\nCommands:\n" + for _, cmd := range [][]interface{}{ + {"run", "Run a command in a container"}, + {"ps", "Display a list of containers"}, + {"pull", "Download a tarball and create a container from it"}, + {"put", "Upload a tarball and create a container from it"}, + {"rm", "Remove containers"}, + {"kill", "Kill a running container"}, + {"wait", "Wait for the state of a container to change"}, + {"stop", "Stop a running container"}, + {"logs", "Fetch the logs of a container"}, + {"diff", "Inspect changes on a container's filesystem"}, + {"commit", "Save the state of a container"}, + {"attach", "Attach to the standard inputs and outputs of a running container"}, + {"info", "Display system-wide information"}, + {"tar", "Stream the contents of a container as a tar archive"}, + {"web", "Generate a web UI"}, + {"images", "List images"}, + } { + help += fmt.Sprintf(" %-10.10s%s\n", cmd...) + } + return help +} + +// 'docker info': display system-wide information. +func (srv *Server) CmdInfo(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + fmt.Fprintf(stdout, "containers: %d\nversion: %s\nimages: %d\n", + len(srv.containers.List()), + VERSION, + len(srv.images.ById)) + return nil +} + +func (srv *Server) CmdStop(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "stop", "[OPTIONS] NAME", "Stop a running container") + if err := cmd.Parse(args); err != nil { + cmd.Usage() + return nil + } + if cmd.NArg() < 1 { + cmd.Usage() + return nil + } + for _, name := range cmd.Args() { + if container := srv.containers.Get(name); container != nil { + if err := container.Stop(); err != nil { + return err + } + fmt.Fprintln(stdout, container.Id) + } else { + return errors.New("No such container: " + name) + } + } + return nil +} + +func (srv *Server) CmdUmount(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "umount", "[OPTIONS] NAME", "umount a container's filesystem (debug only)") + if err := cmd.Parse(args); err != nil { + cmd.Usage() + return nil + } + if cmd.NArg() < 1 { + cmd.Usage() + return nil + } + for _, name := range cmd.Args() { + if container := srv.containers.Get(name); container != nil { + if err := container.Filesystem.Umount(); err != nil { + return err + } + fmt.Fprintln(stdout, container.Id) + } else { + return errors.New("No such container: " + name) + } + } + return nil +} + +func (srv *Server) CmdMount(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "umount", "[OPTIONS] NAME", "mount a container's filesystem (debug only)") + if err := cmd.Parse(args); err != nil { + cmd.Usage() + return nil + } + if cmd.NArg() < 1 { + cmd.Usage() + return nil + } + for _, name := range cmd.Args() { + if container := srv.containers.Get(name); container != nil { + if err := container.Filesystem.Mount(); err != nil { + return err + } + fmt.Fprintln(stdout, container.Id) + } else { + return errors.New("No such container: " + name) + } + } + return nil +} + +func (srv *Server) CmdCat(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "cat", "[OPTIONS] CONTAINER PATH", "write the contents of a container's file to standard output") + if err := cmd.Parse(args); err != nil { + cmd.Usage() + return nil + } + if cmd.NArg() < 2 { + cmd.Usage() + return nil + } + name, path := cmd.Arg(0), cmd.Arg(1) + if container := srv.containers.Get(name); container != nil { + if f, err := container.Filesystem.OpenFile(path, os.O_RDONLY, 0); err != nil { + return err + } else if _, err := io.Copy(stdout, f); err != nil { + return err + } + return nil + } + return errors.New("No such container: " + name) +} + +func (srv *Server) CmdWrite(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "write", "[OPTIONS] CONTAINER PATH", "write the contents of standard input to a container's file") + if err := cmd.Parse(args); err != nil { + cmd.Usage() + return nil + } + if cmd.NArg() < 2 { + cmd.Usage() + return nil + } + name, path := cmd.Arg(0), cmd.Arg(1) + if container := srv.containers.Get(name); container != nil { + if f, err := container.Filesystem.OpenFile(path, os.O_WRONLY|os.O_CREATE, 0600); err != nil { + return err + } else if _, err := io.Copy(f, stdin); err != nil { + return err + } + return nil + } + return errors.New("No such container: " + name) +} + + +func (srv *Server) CmdLs(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "ls", "[OPTIONS] CONTAINER PATH", "List the contents of a container's directory") + if err := cmd.Parse(args); err != nil { + cmd.Usage() + return nil + } + if cmd.NArg() < 2 { + cmd.Usage() + return nil + } + name, path := cmd.Arg(0), cmd.Arg(1) + if container := srv.containers.Get(name); container != nil { + if files, err := container.Filesystem.ReadDir(path); err != nil { + return err + } else { + for _, f := range files { + fmt.Fprintln(stdout, f.Name()) + } + } + return nil + } + return errors.New("No such container: " + name) +} + +func (srv *Server) CmdInspect(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "inspect", "[OPTIONS] CONTAINER", "Return low-level information on a container") + if err := cmd.Parse(args); err != nil { + cmd.Usage() + return nil + } + if cmd.NArg() < 1 { + cmd.Usage() + return nil + } + name := cmd.Arg(0) + var obj interface{} + if container := srv.containers.Get(name); container != nil { + obj = container + } else if image := srv.images.Find(name); image != nil { + obj = image + } else { + return errors.New("No such container or image: " + name) + } + data, err := json.Marshal(obj) + if err != nil { + return err + } + indented := new(bytes.Buffer) + if err = json.Indent(indented, data, "", " "); err != nil { + return err + } + if _, err := io.Copy(stdout, indented); err != nil { + return err + } + return nil +} + +// 'docker rmi NAME' removes all images with the name NAME +func (srv *Server) CmdRmi(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "rmimage", "[OPTIONS] IMAGE", "Remove an image") + if err := cmd.Parse(args); err != nil { + cmd.Usage() + return nil + } + if cmd.NArg() < 1 { + cmd.Usage() + return nil + } + for _, name := range cmd.Args() { + image := srv.images.Find(name) + if image == nil { + return errors.New("No such image: " + name) + } + if err := srv.images.Delete(name); err != nil { + return err + } + } + return nil +} + +func (srv *Server) CmdRm(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "rm", "[OPTIONS] CONTAINER", "Remove a container") + if err := cmd.Parse(args); err != nil { + return nil + } + for _, name := range cmd.Args() { + container := srv.containers.Get(name) + if container == nil { + return errors.New("No such container: " + name) + } + if err := srv.containers.Destroy(container); err != nil { + fmt.Fprintln(stdout, "Error destroying container " + name + ": " + err.Error()) + } + } + return nil +} + +// 'docker kill NAME' kills a running container +func (srv *Server) CmdKill(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "kill", "[OPTIONS] CONTAINER [CONTAINER...]", "Kill a running container") + if err := cmd.Parse(args); err != nil { + return nil + } + for _, name := range cmd.Args() { + container := srv.containers.Get(name) + if container == nil { + return errors.New("No such container: " + name) + } + if err := container.Kill(); err != nil { + fmt.Fprintln(stdout, "Error killing container " + name + ": " + err.Error()) + } + } + return nil +} + +func (srv *Server) CmdPull(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "pull", "[OPTIONS] NAME", "Download a new image from a remote location") + fl_bzip2 := cmd.Bool("j", false, "Bzip2 compression") + fl_gzip := cmd.Bool("z", false, "Gzip compression") + if err := cmd.Parse(args); err != nil { + return nil + } + var compression image.Compression + if *fl_bzip2 { + compression = image.Bzip2 + } else if *fl_gzip { + compression = image.Gzip + } + name := cmd.Arg(0) + if name == "" { + return errors.New("Not enough arguments") + } + u, err := url.Parse(name) + if err != nil { + return err + } + if u.Scheme == "" { + u.Scheme = "http" + } + // FIXME: hardcode a mirror URL that does not depend on a single provider. + if u.Host == "" { + u.Host = "s3.amazonaws.com" + u.Path = path.Join("/docker.io/images", u.Path) + } + fmt.Fprintf(stdout, "Downloading %s from %s...\n", name, u.String()) + resp, err := http.Get(u.String()) + if err != nil { + return err + } + img, err := srv.images.Import(name, resp.Body, stdout, nil, compression) + if err != nil { + return err + } + fmt.Fprintln(stdout, img.Id) + return nil +} + +func (srv *Server) CmdPut(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "put", "[OPTIONS] NAME", "Import a new image from a local archive.") + fl_bzip2 := cmd.Bool("j", false, "Bzip2 compression") + fl_gzip := cmd.Bool("z", false, "Gzip compression") + if err := cmd.Parse(args); err != nil { + return nil + } + var compression image.Compression + if *fl_bzip2 { + compression = image.Bzip2 + } else if *fl_gzip { + compression = image.Gzip + } + name := cmd.Arg(0) + if name == "" { + return errors.New("Not enough arguments") + } + img, err := srv.images.Import(name, stdin, stdout, nil, compression) + if err != nil { + return err + } + fmt.Fprintln(stdout, img.Id) + return nil +} + +func (srv *Server) CmdImages(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "images", "[OPTIONS] [NAME]", "List images") + limit := cmd.Int("l", 0, "Only show the N most recent versions of each image") + quiet := cmd.Bool("q", false, "only show numeric IDs") + cmd.Parse(args) + if cmd.NArg() > 1 { + cmd.Usage() + return nil + } + var nameFilter string + if cmd.NArg() == 1 { + nameFilter = cmd.Arg(0) + } + w := tabwriter.NewWriter(stdout, 20, 1, 3, ' ', 0) + if (!*quiet) { + fmt.Fprintf(w, "NAME\tID\tCREATED\tPARENT\n") + } + for _, name := range srv.images.Names() { + if nameFilter != "" && nameFilter != name { + continue + } + for idx, img := range *srv.images.ByName[name] { + if *limit > 0 && idx >= *limit { + break + } + if !*quiet { + id := img.Id + if !img.IdIsFinal() { + id += "..." + } + for idx, field := range []string{ + /* NAME */ name, + /* ID */ id, + /* CREATED */ future.HumanDuration(time.Now().Sub(img.Created)) + " ago", + /* PARENT */ img.Parent, + } { + if idx == 0 { + w.Write([]byte(field)) + } else { + w.Write([]byte("\t" + field)) + } + } + w.Write([]byte{'\n'}) + } else { + stdout.Write([]byte(img.Id + "\n")) + } + } + } + if (!*quiet) { + w.Flush() + } + return nil + +} + +func (srv *Server) CmdPs(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, + "ps", "[OPTIONS]", "List containers") + quiet := cmd.Bool("q", false, "Only display numeric IDs") + fl_all := cmd.Bool("a", false, "Show all containers. Only running containers are shown by default.") + fl_full := cmd.Bool("notrunc", false, "Don't truncate output") + if err := cmd.Parse(args); err != nil { + return nil + } + w := tabwriter.NewWriter(stdout, 12, 1, 3, ' ', 0) + if (!*quiet) { + fmt.Fprintf(w, "ID\tIMAGE\tCOMMAND\tCREATED\tSTATUS\tCOMMENT\n") + } + for _, container := range srv.containers.List() { + comment := container.GetUserData("comment") + if !container.State.Running && !*fl_all { + continue + } + if !*quiet { + command := fmt.Sprintf("%s %s", container.Path, strings.Join(container.Args, " ")) + if !*fl_full { + command = docker.Trunc(command, 20) + } + for idx, field := range[]string { + /* ID */ container.Id, + /* IMAGE */ container.GetUserData("image"), + /* COMMAND */ command, + /* CREATED */ future.HumanDuration(time.Now().Sub(container.Created)) + " ago", + /* STATUS */ container.State.String(), + /* COMMENT */ comment, + } { + if idx == 0 { + w.Write([]byte(field)) + } else { + w.Write([]byte("\t" + field)) + } + } + w.Write([]byte{'\n'}) + } else { + stdout.Write([]byte(container.Id + "\n")) + } + } + if (!*quiet) { + w.Flush() + } + return nil +} + +func (srv *Server) CmdLayers(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, + "layers", "[OPTIONS]", + "List filesystem layers (debug only)") + if err := cmd.Parse(args); err != nil { + return nil + } + for _, layer := range srv.images.Layers.List() { + fmt.Fprintln(stdout, layer) + } + return nil +} + + +func (srv *Server) CmdCp(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, + "cp", "[OPTIONS] IMAGE NAME", + "Create a copy of IMAGE and call it NAME") + if err := cmd.Parse(args); err != nil { + return nil + } + if newImage, err := srv.images.Copy(cmd.Arg(0), cmd.Arg(1)); err != nil { + return err + } else { + fmt.Fprintln(stdout, newImage.Id) + } + return nil +} + +func (srv *Server) CmdCommit(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, + "commit", "[OPTIONS] CONTAINER [DEST]", + "Create a new image from a container's changes") + if err := cmd.Parse(args); err != nil { + return nil + } + containerName, imgName := cmd.Arg(0), cmd.Arg(1) + if containerName == "" || imgName == "" { + cmd.Usage() + return nil + } + if container := srv.containers.Get(containerName); container != nil { + // FIXME: freeze the container before copying it to avoid data corruption? + rwTar, err := docker.Tar(container.Filesystem.RWPath) + if err != nil { + return err + } + // Create a new image from the container's base layers + a new layer from container changes + parentImg := srv.images.Find(container.GetUserData("image")) + img, err := srv.images.Import(imgName, rwTar, stdout, parentImg, image.Uncompressed) + if err != nil { + return err + } + fmt.Fprintln(stdout, img.Id) + return nil + } + return errors.New("No such container: " + containerName) +} + + +func (srv *Server) CmdTar(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, + "tar", "CONTAINER", + "Stream the contents of a container as a tar archive") + fl_sparse := cmd.Bool("s", false, "Generate a sparse tar stream (top layer + reference to bottom layers)") + if err := cmd.Parse(args); err != nil { + return nil + } + if *fl_sparse { + return errors.New("Sparse mode not yet implemented") // FIXME + } + name := cmd.Arg(0) + if container := srv.containers.Get(name); container != nil { + data, err := container.Filesystem.Tar() + if err != nil { + return err + } + // Stream the entire contents of the container (basically a volatile snapshot) + if _, err := io.Copy(stdout, data); err != nil { + return err + } + return nil + } + return errors.New("No such container: " + name) +} + +func (srv *Server) CmdDiff(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, + "diff", "CONTAINER [OPTIONS]", + "Inspect changes on a container's filesystem") + if err := cmd.Parse(args); err != nil { + return nil + } + if cmd.NArg() < 1 { + return errors.New("Not enough arguments") + } + if container := srv.containers.Get(cmd.Arg(0)); container == nil { + return errors.New("No such container") + } else { + changes, err := container.Filesystem.Changes() + if err != nil { + return err + } + for _, change := range changes { + fmt.Fprintln(stdout, change.String()) + } + } + return nil +} + +func (srv *Server) CmdReset(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, + "reset", "CONTAINER [OPTIONS]", + "Reset changes to a container's filesystem") + if err := cmd.Parse(args); err != nil { + return nil + } + if cmd.NArg() < 1 { + return errors.New("Not enough arguments") + } + for _, name := range cmd.Args() { + if container := srv.containers.Get(name); container != nil { + if err := container.Filesystem.Reset(); err != nil { + return errors.New("Reset " + container.Id + ": " + err.Error()) + } + } + } + return nil +} + + +func (srv *Server) CmdLogs(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "logs", "[OPTIONS] CONTAINER", "Fetch the logs of a container") + if err := cmd.Parse(args); err != nil { + return nil + } + if cmd.NArg() != 1 { + cmd.Usage() + return nil + } + name := cmd.Arg(0) + if container := srv.containers.Get(name); container != nil { + if _, err := io.Copy(stdout, container.StdoutLog()); err != nil { + return err + } + if _, err := io.Copy(stdout, container.StderrLog()); err != nil { + return err + } + return nil + } + return errors.New("No such container: " + cmd.Arg(0)) +} + + +func (srv *Server) CreateContainer(img *image.Image, tty bool, openStdin bool, comment string, cmd string, args ...string) (*docker.Container, error) { + id := future.RandomId()[:8] + container, err := srv.containers.Create(id, cmd, args, img.Layers, + &docker.Config{Hostname: id, Tty: tty, OpenStdin: openStdin}) + if err != nil { + return nil, err + } + if err := container.SetUserData("image", img.Id); err != nil { + srv.containers.Destroy(container) + return nil, errors.New("Error setting container userdata: " + err.Error()) + } + if err := container.SetUserData("comment", comment); err != nil { + srv.containers.Destroy(container) + return nil, errors.New("Error setting container userdata: " + err.Error()) + } + return container, nil +} + +func (srv *Server) CmdAttach(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "attach", "[OPTIONS]", "Attach to a running container") + fl_i := cmd.Bool("i", false, "Attach to stdin") + fl_o := cmd.Bool("o", true, "Attach to stdout") + fl_e := cmd.Bool("e", true, "Attach to stderr") + if err := cmd.Parse(args); err != nil { + return nil + } + if cmd.NArg() != 1 { + cmd.Usage() + return nil + } + name := cmd.Arg(0) + container := srv.containers.Get(name) + if container == nil { + return errors.New("No such container: " + name) + } + var wg sync.WaitGroup + if *fl_i { + c_stdin, err := container.StdinPipe() + if err != nil { + return err + } + wg.Add(1) + go func() { io.Copy(c_stdin, stdin); wg.Add(-1); }() + } + if *fl_o { + c_stdout, err := container.StdoutPipe() + if err != nil { + return err + } + wg.Add(1) + go func() { io.Copy(stdout, c_stdout); wg.Add(-1); }() + } + if *fl_e { + c_stderr, err := container.StderrPipe() + if err != nil { + return err + } + wg.Add(1) + go func() { io.Copy(stdout, c_stderr); wg.Add(-1); }() + } + wg.Wait() + return nil +} + +func (srv *Server) CmdRun(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "run", "[OPTIONS] IMAGE COMMAND [ARG...]", "Run a command in a new container") + fl_attach := cmd.Bool("a", false, "Attach stdin and stdout") + fl_stdin := cmd.Bool("i", false, "Keep stdin open even if not attached") + fl_tty := cmd.Bool("t", false, "Allocate a pseudo-tty") + fl_comment := cmd.String("c", "", "Comment") + if err := cmd.Parse(args); err != nil { + return nil + } + name := cmd.Arg(0) + var cmdline[]string + if len(cmd.Args()) >= 2 { + cmdline = cmd.Args()[1:] + } + // Choose a default image if needed + if name == "" { + name = "base" + } + // Choose a default command if needed + if len(cmdline) == 0 { + *fl_stdin = true + *fl_tty = true + *fl_attach = true + cmdline = []string{"/bin/bash", "-i"} + } + // Find the image + img := srv.images.Find(name) + if img == nil { + return errors.New("No such image: " + name) + } + // Create new container + container, err := srv.CreateContainer(img, *fl_tty, *fl_stdin, *fl_comment, cmdline[0], cmdline[1:]...) + if err != nil { + return errors.New("Error creating container: " + err.Error()) + } + if *fl_stdin { + cmd_stdin, err := container.StdinPipe() + if err != nil { + return err + } + if *fl_attach { + future.Go(func() error { + log.Printf("CmdRun(): start receiving stdin\n") + _, err := io.Copy(cmd_stdin, stdin); + log.Printf("CmdRun(): done receiving stdin\n") + cmd_stdin.Close() + return err + }) + } + } + // Run the container + if *fl_attach { + cmd_stderr, err := container.StderrPipe() + if err != nil { + return err + } + cmd_stdout, err := container.StdoutPipe() + if err != nil { + return err + } + if err := container.Start(); err != nil { + return err + } + sending_stdout := future.Go(func() error { + _, err := io.Copy(stdout, cmd_stdout); + return err + }) + sending_stderr := future.Go(func() error { + _, err := io.Copy(stdout, cmd_stderr); + return err + }) + err_sending_stdout := <-sending_stdout + err_sending_stderr := <-sending_stderr + if err_sending_stdout != nil { + return err_sending_stdout + } + if err_sending_stderr != nil { + return err_sending_stderr + } + container.Wait() + } else { + if err := container.Start(); err != nil { + return err + } + fmt.Fprintln(stdout, container.Id) + } + return nil +} + +func New() (*Server, error) { + future.Seed() + images, err := image.New("/var/lib/docker/images") + if err != nil { + return nil, err + } + containers, err := docker.New() + if err != nil { + return nil, err + } + srv := &Server{ + images: images, + containers: containers, + } + return srv, nil +} + +func (srv *Server) CmdMirror(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + _, err := io.Copy(stdout, stdin) + return err +} + +func (srv *Server) CmdDebug(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + for { + if line, err := bufio.NewReader(stdin).ReadString('\n'); err == nil { + fmt.Printf("--- %s", line) + } else if err == io.EOF { + if len(line) > 0 { + fmt.Printf("--- %s\n", line) + } + break + } else { + return err + } + } + return nil +} + +func (srv *Server) CmdWeb(stdin io.ReadCloser, stdout io.Writer, args ...string) error { + cmd := rcli.Subcmd(stdout, "web", "[OPTIONS]", "A web UI for docker") + showurl := cmd.Bool("u", false, "Return the URL of the web UI") + if err := cmd.Parse(args); err != nil { + return nil + } + if *showurl { + fmt.Fprintln(stdout, "http://localhost:4242/web") + } else { + if file, err := os.Open("dockerweb.html"); err != nil { + return err + } else if _, err := io.Copy(stdout, file); err != nil { + return err + } + } + return nil +} + + +type Server struct { + containers *docker.Docker + images *image.Store +} +