$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-ace.git /var/lib/mock/f39-build-1585534-38146/root/chroot_tmpdir/scmroot/gap-pkg-ace
Cloning into '/var/lib/mock/f39-build-1585534-38146/root/chroot_tmpdir/scmroot/gap-pkg-ace'...
$ git fetch origin 451ee0a25047f288d2d8787c218a6dfcd238887b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-ace
 * [new ref]         451ee0a25047f288d2d8787c218a6dfcd238887b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 451ee0a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild