$ git clone -n https://src.fedoraproject.org/rpms/fbg2.git /var/lib/mock/f40-build-791634-137676/root/chroot_tmpdir/scmroot/fbg2
Cloning into '/var/lib/mock/f40-build-791634-137676/root/chroot_tmpdir/scmroot/fbg2'...
$ git fetch origin 7fff1529a56ef302c6e6e406d1567ae2ad000390:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fbg2
 * [new ref]         7fff1529a56ef302c6e6e406d1567ae2ad000390 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7fff152 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild