$ git clone -n https://src.fedoraproject.org/rpms/rubygem-activestorage.git /var/lib/mock/f38-build-side-42-init-devel-662500-26636/root/chroot_tmpdir/scmroot/rubygem-activestorage
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-662500-26636/root/chroot_tmpdir/scmroot/rubygem-activestorage'...
$ git fetch origin aeac8318d148880d92cc263cbaccc11bd6f5a066:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-activestorage
 * [new ref]         aeac8318d148880d92cc263cbaccc11bd6f5a066 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aeac831 Enable tests.