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https://github.com/moby/moby.git
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600ad5c1b7
Steps to reproduce:
```
# docker run -tid --name aaa ubuntu
57bfd00ac5559f72eec8c1b32a01fe38427d66687940f74611e65137414f0ada
# docker run -tid --name bbb --link aaa ubuntu
23ad18362950f39b638206ab4d1885fd4f50cbd1d16aac9cab8e97e0c8363471
# docker ps --no-trunc
CONTAINER ID IMAGE
COMMAND CREATED STATUS PORTS
NAMES
23ad18362950f39b638206ab4d1885fd4f50cbd1d16aac9cab8e97e0c8363471
ubuntu "/bin/bash" 4 seconds ago Up 3 seconds
bbb
57bfd00ac5559f72eec8c1b32a01fe38427d66687940f74611e65137414f0ada
ubuntu "/bin/bash" 14 seconds ago Up 14
seconds aaa,bbb/aaa
# docker rm -f bbb
bbb
# docker ps --no-trunc
CONTAINER ID IMAGE
COMMAND CREATED STATUS PORTS
NAMES
57bfd00ac5559f72eec8c1b32a01fe38427d66687940f74611e65137414f0ada
ubuntu "/bin/bash" 29 seconds ago Up 28
seconds aaa,bbb/aaa
# docker rm --link bbb/aaa
Error response from daemon: Cannot get parent /bbb for name /bbb/aaa
```
When we rm container `bbb`, we can still see `bbb/aaa` in `docker ps
--no-trunc`. And this link cannot be deleted since container `bbb` has
already been removed.
We should remove links of a container when it is deleted.
Signed-off-by: Yuanhong Peng <pengyuanhong@huawei.com>
91 lines
2.6 KiB
Go
91 lines
2.6 KiB
Go
package daemon
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import (
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"sync"
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"github.com/docker/docker/container"
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)
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// linkIndex stores link relationships between containers, including their specified alias
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// The alias is the name the parent uses to reference the child
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type linkIndex struct {
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// idx maps a parent->alias->child relationship
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idx map[*container.Container]map[string]*container.Container
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// childIdx maps child->parent->aliases
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childIdx map[*container.Container]map[*container.Container]map[string]struct{}
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mu sync.Mutex
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}
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func newLinkIndex() *linkIndex {
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return &linkIndex{
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idx: make(map[*container.Container]map[string]*container.Container),
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childIdx: make(map[*container.Container]map[*container.Container]map[string]struct{}),
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}
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}
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// link adds indexes for the passed in parent/child/alias relationships
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func (l *linkIndex) link(parent, child *container.Container, alias string) {
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l.mu.Lock()
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if l.idx[parent] == nil {
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l.idx[parent] = make(map[string]*container.Container)
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}
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l.idx[parent][alias] = child
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if l.childIdx[child] == nil {
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l.childIdx[child] = make(map[*container.Container]map[string]struct{})
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}
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if l.childIdx[child][parent] == nil {
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l.childIdx[child][parent] = make(map[string]struct{})
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}
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l.childIdx[child][parent][alias] = struct{}{}
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l.mu.Unlock()
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}
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// unlink removes the requested alias for the given parent/child
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func (l *linkIndex) unlink(alias string, child, parent *container.Container) {
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l.mu.Lock()
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delete(l.idx[parent], alias)
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delete(l.childIdx[child], parent)
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l.mu.Unlock()
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}
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// children maps all the aliases-> children for the passed in parent
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// aliases here are the aliases the parent uses to refer to the child
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func (l *linkIndex) children(parent *container.Container) map[string]*container.Container {
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l.mu.Lock()
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children := l.idx[parent]
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l.mu.Unlock()
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return children
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}
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// parents maps all the aliases->parent for the passed in child
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// aliases here are the aliases the parents use to refer to the child
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func (l *linkIndex) parents(child *container.Container) map[string]*container.Container {
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l.mu.Lock()
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parents := make(map[string]*container.Container)
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for parent, aliases := range l.childIdx[child] {
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for alias := range aliases {
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parents[alias] = parent
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}
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}
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l.mu.Unlock()
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return parents
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}
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// delete deletes all link relationships referencing this container
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func (l *linkIndex) delete(container *container.Container) []string {
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l.mu.Lock()
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var aliases []string
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for alias, child := range l.idx[container] {
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aliases = append(aliases, alias)
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delete(l.childIdx[child], container)
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}
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delete(l.idx, container)
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delete(l.childIdx, container)
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l.mu.Unlock()
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return aliases
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}
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