$ git clone -n https://src.fedoraproject.org/rpms/rubygem-safe_yaml.git /var/lib/mock/f41-build-746391-13355/root/chroot_tmpdir/scmroot/rubygem-safe_yaml
Cloning into '/var/lib/mock/f41-build-746391-13355/root/chroot_tmpdir/scmroot/rubygem-safe_yaml'...
$ git fetch origin d387042483068622281324f3547341e4f7e31331:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-safe_yaml
 * [new ref]         d387042483068622281324f3547341e4f7e31331 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d387042 Eliminate use of obsolete %patchN syntax (#2283636)