$ git clone -n https://src.fedoraproject.org/rpms/gpac.git /var/lib/mock/f45-build-12919-444/root/chroot_tmpdir/scmroot/gpac
Cloning into '/var/lib/mock/f45-build-12919-444/root/chroot_tmpdir/scmroot/gpac'...
$ git fetch origin d578b292dab7b3934a46df14abab74b73477fe40:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gpac
 * [new ref]         d578b292dab7b3934a46df14abab74b73477fe40 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d578b29 backport upstream patch to unbreak external code using string functions