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This is a tracking bug assuring the fix for [bug 1784950] gets applied in extras-rhel-7.8 branch of buildah.

I believe the RHEL7 image has FIPS support, not sure what the issue is?  If the link between /etc/system-fips and /run/secrets/system-fips is completed by the container engines and the kernel is in fips mode then the rhel7 content will go into fips mode.

RHEL7 does not support any of the new RHEL8 features of crypto libraries, but it should work in fips mode.

RHEL7 is in Maintenance mode.  Buildah 1.14.9 has support for this in RHEL8