323 lines
9.0 KiB
Go
323 lines
9.0 KiB
Go
package main
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/containers/buildah"
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"github.com/containers/buildah/imagebuildah"
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buildahcli "github.com/containers/buildah/pkg/cli"
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"github.com/containers/libpod/cmd/podman/cliconfig"
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"github.com/containers/libpod/pkg/adapter"
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"github.com/docker/go-units"
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"github.com/opencontainers/runtime-spec/specs-go"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"github.com/spf13/cobra"
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)
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var (
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buildCommand cliconfig.BuildValues
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buildDescription = "Builds an OCI or Docker image using instructions from one or more Dockerfiles and a specified build context directory."
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layerValues buildahcli.LayerResults
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budFlagsValues buildahcli.BudResults
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fromAndBudValues buildahcli.FromAndBudResults
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userNSValues buildahcli.UserNSResults
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namespaceValues buildahcli.NameSpaceResults
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_buildCommand = &cobra.Command{
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Use: "build [flags] CONTEXT",
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Short: "Build an image using instructions from Dockerfiles",
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Long: buildDescription,
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RunE: func(cmd *cobra.Command, args []string) error {
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buildCommand.InputArgs = args
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buildCommand.GlobalFlags = MainGlobalOpts
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buildCommand.BudResults = &budFlagsValues
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buildCommand.UserNSResults = &userNSValues
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buildCommand.FromAndBudResults = &fromAndBudValues
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buildCommand.LayerResults = &layerValues
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buildCommand.NameSpaceResults = &namespaceValues
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return buildCmd(&buildCommand)
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},
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Example: `podman build .
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podman build --cert-dir ~/auth --creds=username:password -t imageName -f Dockerfile.simple .
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podman build --layers --force-rm --tag imageName .`,
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}
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)
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func init() {
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buildCommand.Command = _buildCommand
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buildCommand.SetHelpTemplate(HelpTemplate())
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buildCommand.SetUsageTemplate(UsageTemplate())
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flags := buildCommand.Flags()
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flags.SetInterspersed(true)
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budFlags := buildahcli.GetBudFlags(&budFlagsValues)
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flag := budFlags.Lookup("pull")
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flag.Value.Set("true")
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flag.DefValue = "true"
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layerFlags := buildahcli.GetLayerFlags(&layerValues)
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flag = layerFlags.Lookup("layers")
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flag.Value.Set(useLayers())
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flag.DefValue = (useLayers())
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flag = layerFlags.Lookup("force-rm")
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flag.Value.Set("true")
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flag.DefValue = "true"
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fromAndBugFlags := buildahcli.GetFromAndBudFlags(&fromAndBudValues, &userNSValues, &namespaceValues)
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flags.AddFlagSet(&budFlags)
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flags.AddFlagSet(&layerFlags)
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flags.AddFlagSet(&fromAndBugFlags)
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}
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func getDockerfiles(files []string) []string {
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var dockerfiles []string
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for _, f := range files {
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if f == "-" {
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dockerfiles = append(dockerfiles, "/dev/stdin")
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} else {
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dockerfiles = append(dockerfiles, f)
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}
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}
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return dockerfiles
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}
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func getNsValues(c *cliconfig.BuildValues) ([]buildah.NamespaceOption, error) {
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var ret []buildah.NamespaceOption
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if c.Network != "" {
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if c.Network == "host" {
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ret = append(ret, buildah.NamespaceOption{
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Name: string(specs.NetworkNamespace),
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Host: true,
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})
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} else if c.Network[0] == '/' {
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ret = append(ret, buildah.NamespaceOption{
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Name: string(specs.NetworkNamespace),
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Path: c.Network,
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})
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} else {
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return nil, fmt.Errorf("unsupported configuration network=%s", c.Network)
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}
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}
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return ret, nil
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}
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func buildCmd(c *cliconfig.BuildValues) error {
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// The following was taken directly from containers/buildah/cmd/bud.go
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// TODO Find a away to vendor more of this in rather than copy from bud
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output := ""
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tags := []string{}
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if c.Flag("tag").Changed {
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tags = c.Tag
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if len(tags) > 0 {
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output = tags[0]
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tags = tags[1:]
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}
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}
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pullPolicy := imagebuildah.PullNever
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if c.Pull {
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pullPolicy = imagebuildah.PullIfMissing
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}
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if c.PullAlways {
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pullPolicy = imagebuildah.PullAlways
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}
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args := make(map[string]string)
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if c.Flag("build-arg").Changed {
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for _, arg := range c.BuildArg {
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av := strings.SplitN(arg, "=", 2)
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if len(av) > 1 {
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args[av[0]] = av[1]
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} else {
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delete(args, av[0])
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}
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}
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}
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dockerfiles := getDockerfiles(c.File)
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format, err := getFormat(&c.PodmanCommand)
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if err != nil {
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return nil
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}
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contextDir := ""
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cliArgs := c.InputArgs
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layers := c.Layers // layers for podman defaults to true
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// Check to see if the BUILDAH_LAYERS environment variable is set and override command-line
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if _, ok := os.LookupEnv("BUILDAH_LAYERS"); ok {
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layers = buildahcli.UseLayers()
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}
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if len(cliArgs) > 0 {
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// The context directory could be a URL. Try to handle that.
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tempDir, subDir, err := imagebuildah.TempDirForURL("", "buildah", cliArgs[0])
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if err != nil {
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return errors.Wrapf(err, "error prepping temporary context directory")
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}
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if tempDir != "" {
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// We had to download it to a temporary directory.
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// Delete it later.
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defer func() {
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if err = os.RemoveAll(tempDir); err != nil {
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logrus.Errorf("error removing temporary directory %q: %v", contextDir, err)
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}
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}()
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contextDir = filepath.Join(tempDir, subDir)
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} else {
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// Nope, it was local. Use it as is.
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absDir, err := filepath.Abs(cliArgs[0])
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if err != nil {
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return errors.Wrapf(err, "error determining path to directory %q", cliArgs[0])
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}
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contextDir = absDir
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}
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cliArgs = Tail(cliArgs)
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} else {
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// No context directory or URL was specified. Try to use the
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// home of the first locally-available Dockerfile.
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for i := range dockerfiles {
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if strings.HasPrefix(dockerfiles[i], "http://") ||
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strings.HasPrefix(dockerfiles[i], "https://") ||
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strings.HasPrefix(dockerfiles[i], "git://") ||
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strings.HasPrefix(dockerfiles[i], "github.com/") {
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continue
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}
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absFile, err := filepath.Abs(dockerfiles[i])
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if err != nil {
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return errors.Wrapf(err, "error determining path to file %q", dockerfiles[i])
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}
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contextDir = filepath.Dir(absFile)
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dockerfiles[i], err = filepath.Rel(contextDir, absFile)
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if err != nil {
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return errors.Wrapf(err, "error determining path to file %q", dockerfiles[i])
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}
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break
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}
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}
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if contextDir == "" {
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return errors.Errorf("no context directory specified, and no dockerfile specified")
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}
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if len(dockerfiles) == 0 {
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dockerfiles = append(dockerfiles, filepath.Join(contextDir, "Dockerfile"))
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}
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runtime, err := adapter.GetRuntime(&c.PodmanCommand)
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if err != nil {
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return errors.Wrapf(err, "could not get runtime")
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}
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runtimeFlags := []string{}
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for _, arg := range c.RuntimeFlags {
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runtimeFlags = append(runtimeFlags, "--"+arg)
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}
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// end from buildah
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defer runtime.Shutdown(false)
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var stdout, stderr, reporter *os.File
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stdout = os.Stdout
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stderr = os.Stderr
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reporter = os.Stderr
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if c.Flag("logfile").Changed {
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f, err := os.OpenFile(c.Logfile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
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if err != nil {
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return errors.Errorf("error opening logfile %q: %v", c.Logfile, err)
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}
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defer f.Close()
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logrus.SetOutput(f)
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stdout = f
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stderr = f
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reporter = f
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}
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var memoryLimit, memorySwap int64
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if c.Flags().Changed("memory") {
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memoryLimit, err = units.RAMInBytes(c.Memory)
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if err != nil {
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return err
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}
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}
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if c.Flags().Changed("memory-swap") {
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memorySwap, err = units.RAMInBytes(c.MemorySwap)
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if err != nil {
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return err
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}
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}
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nsValues, err := getNsValues(c)
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if err != nil {
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return err
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}
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buildOpts := buildah.CommonBuildOptions{
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AddHost: c.AddHost,
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CgroupParent: c.CgroupParent,
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CPUPeriod: c.CPUPeriod,
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CPUQuota: c.CPUQuota,
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CPUShares: c.CPUShares,
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CPUSetCPUs: c.CPUSetCPUs,
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CPUSetMems: c.CPUSetMems,
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Memory: memoryLimit,
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MemorySwap: memorySwap,
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ShmSize: c.ShmSize,
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Ulimit: c.Ulimit,
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Volumes: c.Volume,
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}
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options := imagebuildah.BuildOptions{
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CommonBuildOpts: &buildOpts,
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AdditionalTags: tags,
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Annotations: c.Annotation,
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Args: args,
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CNIConfigDir: c.CNIConfigDir,
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CNIPluginPath: c.CNIPlugInPath,
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Compression: imagebuildah.Gzip,
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ContextDirectory: contextDir,
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DefaultMountsFilePath: c.GlobalFlags.DefaultMountsFile,
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Err: stderr,
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ForceRmIntermediateCtrs: c.ForceRm,
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IIDFile: c.Iidfile,
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Labels: c.Label,
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Layers: layers,
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NamespaceOptions: nsValues,
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NoCache: c.NoCache,
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Out: stdout,
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Output: output,
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OutputFormat: format,
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PullPolicy: pullPolicy,
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Quiet: c.Quiet,
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RemoveIntermediateCtrs: c.Rm,
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ReportWriter: reporter,
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RuntimeArgs: runtimeFlags,
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SignaturePolicyPath: c.SignaturePolicy,
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Squash: c.Squash,
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Target: c.Target,
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}
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return runtime.Build(getContext(), c, options, dockerfiles)
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}
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// Tail returns a string slice after the first element unless there are
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// not enough elements, then it returns an empty slice. This is to replace
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// the urfavecli Tail method for args
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func Tail(a []string) []string {
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if len(a) >= 2 {
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return []string(a)[1:]
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}
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return []string{}
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}
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// useLayers returns false if BUILDAH_LAYERS is set to "0" or "false"
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// otherwise it returns true
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func useLayers() string {
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layers := os.Getenv("BUILDAH_LAYERS")
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if strings.ToLower(layers) == "false" || layers == "0" {
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return "false"
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}
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return "true"
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}
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