$ git clone -n https://src.fedoraproject.org/rpms/libmks.git /var/lib/mock/f39-build-1602458-38570/root/chroot_tmpdir/scmroot/libmks
Cloning into '/var/lib/mock/f39-build-1602458-38570/root/chroot_tmpdir/scmroot/libmks'...
$ git fetch origin d90ba7786019f6a85f142def6f0ef06311a63489:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmks
 * [new ref]         d90ba7786019f6a85f142def6f0ef06311a63489 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d90ba77 [packit] 0.1.5 upstream release