[BZ #2083997] pod: build pause image in custom user NS

[vrothberg]

Use the host UID and host GID mapping when building the local pause
image for a Pod with a custom mapping. Otherwise, the mappings are off
and the build fails. Propagating the mapping to the build container is
not needed since the pause image ships merely a copied catatonit from
the host.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2083997
Signed-off-by: Valentin Rothberg vrothberg@redhat.com

Does this PR introduce a user-facing change?

Fix a bug where the pause image of a Pod with a custom ID mapping could not be built (https://bugzilla.redhat.com/show_bug.cgi?id=2083997).

[openshift-ci]

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[vrothberg]

@giuseppe @rhatdan @TomSweeneyRedHat PTAL

@mheon FYI, probably a backport candidate for v4.1. Probably v4.0 (RHEL) if the council wishes.

[mheon]

LGTM, but your tests are red

[vrothberg]

@rhatdan @TomSweeneyRedHat PTAL

[rhatdan]

/lgtm
/hold

[vrothberg]

/hold cancel

[vrothberg]

/cherry-pick v4.1

[openshift-cherrypick-robot]

@vrothberg: once the present PR merges, I will cherry-pick it on top of v4.1 in a new PR and assign it to you.

In response to this:

/cherry-pick v4.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-cherrypick-robot]

@vrothberg: #14232 failed to apply on top of branch "v4.1":

Applying: pod: build pause image in custom user NS
Using index info to reconstruct a base tree...
A	pkg/specgen/generate/pause_image.go
Falling back to patching base and 3-way merge...
CONFLICT (modify/delete): pkg/specgen/generate/pause_image.go deleted in HEAD and modified in pod: build pause image in custom user NS. Version pod: build pause image in custom user NS of pkg/specgen/generate/pause_image.go left in tree.
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 pod: build pause image in custom user NS
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 v4.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.