$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-singular.git /var/lib/mock/f40-build-2693798-69026/root/chroot_tmpdir/scmroot/gap-pkg-singular
Cloning into '/var/lib/mock/f40-build-2693798-69026/root/chroot_tmpdir/scmroot/gap-pkg-singular'...
$ git fetch origin e91074d1d62dd394af1fcadaaf43774cb1633f9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-singular
 * [new ref]         e91074d1d62dd394af1fcadaaf43774cb1633f9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e91074d Rebuild for gap 4.13.0