$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-aclib.git /var/lib/mock/f40-build-2590446-62621/root/chroot_tmpdir/scmroot/gap-pkg-aclib
Cloning into '/var/lib/mock/f40-build-2590446-62621/root/chroot_tmpdir/scmroot/gap-pkg-aclib'...
$ git fetch origin e1004ea6e6e78df6e38f0eb9d5f31e0bb4e74f80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-aclib
 * [new ref]         e1004ea6e6e78df6e38f0eb9d5f31e0bb4e74f80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1004ea Rebuild for gap 4.13.0