Allow '/' to prefix container names to match Docker

[rhatdan]

Fixes: #16663

Signed-off-by: Daniel J Walsh dwalsh@redhat.com

Does this PR introduce a user-facing change?

Podman now supports container names beginning with a '/' to match Docker behaviour.

[vrothberg]

I think there's more to unpack since Docker strips off the leading '/'. '/foo' create the name "foo" and it will also be stripped of in regexes. Yet ^/foo$ is not a valid regex to me.

[Luap99]

I think there's more to unpack since Docker strips off the leading '/'. '/foo' create the name "foo" and it will also be stripped of in regexes. Yet ^/foo$ is not a valid regex to me.

docker always stores the name with a leading /, if you look at the API response they always include the slash. see the compat API for example

podman/pkg/api/handlers/compat/containers.go

Line 497 in 1b677c5

Name: fmt.Sprintf("/%s", l.Name()),

So if you apply a filter via docker api we must also add the slash to the name before running the filter regex.

[mheon]

Can initialize this with make([]string, 0, len(input)) to ensure we only do one allocation

[rhatdan]

@vrothberg @Luap99 @mheon PTAL

[mheon]

Code LGTM

[rhatdan]

@containers/podman-maintainers PTAL

[rhatdan]

@vrothberg @giuseppe @flouthoc @ashley-cui PTAL

[flouthoc]

LGTM

[openshift-ci]

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[baude]

/cherry-pick v4.4

[openshift-cherrypick-robot]

@baude: #16820 failed to apply on top of branch "v4.4":

Applying: Allow '/' to prefix container names to match Docker
Using index info to reconstruct a base tree...
M	cmd/podman/containers/attach.go
M	cmd/podman/containers/checkpoint.go
M	cmd/podman/containers/commit.go
M	cmd/podman/containers/exec.go
M	cmd/podman/containers/exists.go
M	cmd/podman/containers/export.go
M	cmd/podman/containers/init.go
M	cmd/podman/containers/kill.go
M	cmd/podman/containers/logs.go
M	cmd/podman/containers/mount.go
M	cmd/podman/containers/pause.go
M	cmd/podman/containers/port.go
M	cmd/podman/containers/prune.go
M	cmd/podman/containers/rename.go
M	cmd/podman/containers/restart.go
M	cmd/podman/containers/restore.go
M	cmd/podman/containers/rm.go
M	cmd/podman/containers/runlabel.go
M	cmd/podman/containers/start.go
M	cmd/podman/containers/stats.go
M	cmd/podman/containers/stop.go
M	cmd/podman/containers/top.go
M	cmd/podman/containers/unmount.go
M	cmd/podman/containers/unpause.go
M	cmd/podman/containers/update.go
M	cmd/podman/containers/wait.go
M	cmd/podman/utils/utils.go
M	libpod/options.go
M	libpod/runtime_ctr.go
M	pkg/domain/filters/containers.go
M	test/system/030-run.bats
Falling back to patching base and 3-way merge...
Auto-merging test/system/030-run.bats
CONFLICT (content): Merge conflict in test/system/030-run.bats
Auto-merging pkg/domain/filters/containers.go
Auto-merging libpod/runtime_ctr.go
Auto-merging libpod/options.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Allow '/' to prefix container names to match Docker
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick v4.4

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[vrothberg]

This is already in the v4.4 branch