$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-repsn.git /var/lib/mock/f39-build-1542526-36519/root/chroot_tmpdir/scmroot/gap-pkg-repsn
Cloning into '/var/lib/mock/f39-build-1542526-36519/root/chroot_tmpdir/scmroot/gap-pkg-repsn'...
$ git fetch origin 155b3534fd07a4fd635ad432006b3964d5a8e6e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-repsn
 * [new ref]         155b3534fd07a4fd635ad432006b3964d5a8e6e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 155b353 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild