$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-loops.git /var/lib/mock/f40-build-2664435-67056/root/chroot_tmpdir/scmroot/gap-pkg-loops
Cloning into '/var/lib/mock/f40-build-2664435-67056/root/chroot_tmpdir/scmroot/gap-pkg-loops'...
$ git fetch origin 7f707d1f42d32846fb7d1bf92d7e29b9a2886cab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-loops
 * [new ref]         7f707d1f42d32846fb7d1bf92d7e29b9a2886cab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f707d1 Rebuild for gap 4.13.0