$ git clone -n https://src.fedoraproject.org/rpms/gambit-c.git /var/lib/mock/f45-build-9413-403/root/chroot_tmpdir/scmroot/gambit-c
Cloning into '/var/lib/mock/f45-build-9413-403/root/chroot_tmpdir/scmroot/gambit-c'...
$ git fetch origin bb1a2d7dc6d87d9a3ad0cd8a3cb5abed53622e87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gambit-c
 * [new ref]         bb1a2d7dc6d87d9a3ad0cd8a3cb5abed53622e87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb1a2d7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild