$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-sla.git /var/lib/mock/f45-build-9577-406/root/chroot_tmpdir/scmroot/gap-pkg-sla
Cloning into '/var/lib/mock/f45-build-9577-406/root/chroot_tmpdir/scmroot/gap-pkg-sla'...
$ git fetch origin 1818ac3646a7947d166495bcd7fd03850abd6cc6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-sla
 * [new ref]         1818ac3646a7947d166495bcd7fd03850abd6cc6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1818ac3 Use the GAP declarative buildsystem