Rootless users cannot set the `security.ima` xattr on files
(presumably for security reasons, they get an EPERM on trying to
do so). We will normally try and preserve that xattr, so when
trying to add a file with an IMA xattr to a build on a Buildah
without this patch, you get an error. With this patch, the error
is downgraded to a warning, as it's better to successfully build
with a missing xattr than blocking all builds which want to
include the offending file.
The urgency on this has become somewhat higher as it seems like
F41/Rawhide are installing rpm-plugin-ima by default, which is
setting IMA xattrs on some files that Podman relies on - for
example, the catatonit binary we use for pid pause images.
Without this patch, building the pause image as rootless will
always fail on a system with rpm-plugin-ima installed.
Fixes: https://github.com/containers/podman/issues/18543
<MH: Cherry picked back to release-1.37, conflicts fixed>
Signed-off-by: Matt Heon <mheon@redhat.com>
8165aae9e8