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cmd/docker: fix completion for --context 

registerCompletionFuncForGlobalFlags was called from newDockerCommand,
at which time no context-store is initialized yet, so it would return
a nil value, probably resulting in `store.Names` to panic, but these
errors are not shown when running the completion. As a result, the flag
completion would fall back to completing from filenames.

This patch changes the function to dynamically get the context-store;
this fixes the problem mentioned above, because at the time the completion
function is _invoked_, the CLI is fully initialized, and does have a
context-store available.

A (non-exported) interface is defined to allow the function to accept
alternative implementations (not requiring a full command.DockerCLI).

Before this patch:

    docker context create one
    docker context create two

    docker --context <TAB>
    .DS_Store                   .idea/                      Makefile
    .dockerignore               .mailmap                    build/
    ...

With this patch:

    docker context create one
    docker context create two

    docker --context <TAB>
    default  one      two

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 42b68a3ed7)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2024-07-05 14:57:19 +02:00
parent 4473f48847
commit 787caf2fe4
No known key found for this signature in database
GPG Key ID: 76698F39D527CE8C
2 changed files with 10 additions and 12 deletions
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16
cmd/docker/completions.go
View File

@ -6,17 +6,15 @@ import (
"github.com/spf13/cobra"
)
func registerCompletionFuncForGlobalFlags(contextStore store.Store, cmd *cobra.Command) error {
err := cmd.RegisterFlagCompletionFunc(
"context",
func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
names, err := store.Names(contextStore)
if err != nil {
return nil, cobra.ShellCompDirectiveError
type contextStoreProvider interface {
ContextStore() store.Store
}
func registerCompletionFuncForGlobalFlags(dockerCLI contextStoreProvider, cmd *cobra.Command) error {
err := cmd.RegisterFlagCompletionFunc("context", func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
names, _ := store.Names(dockerCLI.ContextStore())
return names, cobra.ShellCompDirectiveNoFileComp
},
)
})
if err != nil {
return err
}

2
cmd/docker/docker.go
View File

@ -102,7 +102,7 @@ func newDockerCommand(dockerCli *command.DockerCli) *cli.TopLevelCommand {
cmd.SetErr(dockerCli.Err())
opts, helpCmd = cli.SetupRootCommand(cmd)
_ = registerCompletionFuncForGlobalFlags(dockerCli.ContextStore(), cmd)
_ = registerCompletionFuncForGlobalFlags(dockerCli, cmd)
cmd.Flags().BoolP("version", "v", false, "Print version information and quit")
setFlagErrorFunc(dockerCli, cmd)