$ git clone -n https://src.fedoraproject.org/rpms/gauche.git /var/lib/mock/f45-build-9622-406/root/chroot_tmpdir/scmroot/gauche
Cloning into '/var/lib/mock/f45-build-9622-406/root/chroot_tmpdir/scmroot/gauche'...
$ git fetch origin 8897d5a49ecb7745fbf7c486d427d954c8847e4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gauche
 * [new ref]         8897d5a49ecb7745fbf7c486d427d954c8847e4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8897d5a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild