mirror of https://github.com/docker/docs.git
129 lines
3.8 KiB
Go
129 lines
3.8 KiB
Go
package daemon
|
|
|
|
import (
|
|
"strings"
|
|
"sync"
|
|
|
|
"github.com/Sirupsen/logrus"
|
|
"github.com/docker/docker/container"
|
|
"github.com/docker/docker/pkg/graphdb"
|
|
)
|
|
|
|
// linkIndex stores link relationships between containers, including their specified alias
|
|
// The alias is the name the parent uses to reference the child
|
|
type linkIndex struct {
|
|
// idx maps a parent->alias->child relationship
|
|
idx map[*container.Container]map[string]*container.Container
|
|
// childIdx maps child->parent->aliases
|
|
childIdx map[*container.Container]map[*container.Container]map[string]struct{}
|
|
mu sync.Mutex
|
|
}
|
|
|
|
func newLinkIndex() *linkIndex {
|
|
return &linkIndex{
|
|
idx: make(map[*container.Container]map[string]*container.Container),
|
|
childIdx: make(map[*container.Container]map[*container.Container]map[string]struct{}),
|
|
}
|
|
}
|
|
|
|
// link adds indexes for the passed in parent/child/alias relationships
|
|
func (l *linkIndex) link(parent, child *container.Container, alias string) {
|
|
l.mu.Lock()
|
|
|
|
if l.idx[parent] == nil {
|
|
l.idx[parent] = make(map[string]*container.Container)
|
|
}
|
|
l.idx[parent][alias] = child
|
|
if l.childIdx[child] == nil {
|
|
l.childIdx[child] = make(map[*container.Container]map[string]struct{})
|
|
}
|
|
if l.childIdx[child][parent] == nil {
|
|
l.childIdx[child][parent] = make(map[string]struct{})
|
|
}
|
|
l.childIdx[child][parent][alias] = struct{}{}
|
|
|
|
l.mu.Unlock()
|
|
}
|
|
|
|
// unlink removes the requested alias for the given parent/child
|
|
func (l *linkIndex) unlink(alias string, child, parent *container.Container) {
|
|
l.mu.Lock()
|
|
delete(l.idx[parent], alias)
|
|
delete(l.childIdx[child], parent)
|
|
l.mu.Unlock()
|
|
}
|
|
|
|
// children maps all the aliases-> children for the passed in parent
|
|
// aliases here are the aliases the parent uses to refer to the child
|
|
func (l *linkIndex) children(parent *container.Container) map[string]*container.Container {
|
|
l.mu.Lock()
|
|
children := l.idx[parent]
|
|
l.mu.Unlock()
|
|
return children
|
|
}
|
|
|
|
// parents maps all the aliases->parent for the passed in child
|
|
// aliases here are the aliases the parents use to refer to the child
|
|
func (l *linkIndex) parents(child *container.Container) map[string]*container.Container {
|
|
l.mu.Lock()
|
|
|
|
parents := make(map[string]*container.Container)
|
|
for parent, aliases := range l.childIdx[child] {
|
|
for alias := range aliases {
|
|
parents[alias] = parent
|
|
}
|
|
}
|
|
|
|
l.mu.Unlock()
|
|
return parents
|
|
}
|
|
|
|
// delete deletes all link relationships referencing this container
|
|
func (l *linkIndex) delete(container *container.Container) {
|
|
l.mu.Lock()
|
|
for _, child := range l.idx[container] {
|
|
delete(l.childIdx[child], container)
|
|
}
|
|
delete(l.idx, container)
|
|
delete(l.childIdx, container)
|
|
l.mu.Unlock()
|
|
}
|
|
|
|
// migrateLegacySqliteLinks migrates sqlite links to use links from HostConfig
|
|
// when sqlite links were used, hostConfig.Links was set to nil
|
|
func (daemon *Daemon) migrateLegacySqliteLinks(db *graphdb.Database, container *container.Container) error {
|
|
// if links is populated (or an empty slice), then this isn't using sqlite links and can be skipped
|
|
if container.HostConfig == nil || container.HostConfig.Links != nil {
|
|
return nil
|
|
}
|
|
|
|
logrus.Debugf("migrating legacy sqlite link info for container: %s", container.ID)
|
|
|
|
fullName := container.Name
|
|
if fullName[0] != '/' {
|
|
fullName = "/" + fullName
|
|
}
|
|
|
|
// don't use a nil slice, this ensures that the check above will skip once the migration has completed
|
|
links := []string{}
|
|
children, err := db.Children(fullName, 0)
|
|
if err != nil {
|
|
if !strings.Contains(err.Error(), "Cannot find child for") {
|
|
return err
|
|
}
|
|
// else continue... it's ok if we didn't find any children, it'll just be nil and we can continue the migration
|
|
}
|
|
|
|
for _, child := range children {
|
|
c, err := daemon.GetContainer(child.Entity.ID())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
links = append(links, c.Name+":"+child.Edge.Name)
|
|
}
|
|
|
|
container.HostConfig.Links = links
|
|
return container.WriteHostConfig()
|
|
}
|