$ git clone -n https://src.fedoraproject.org/rpms/cantor.git /var/lib/mock/f40-build-708224-13010/root/chroot_tmpdir/scmroot/cantor
Cloning into '/var/lib/mock/f40-build-708224-13010/root/chroot_tmpdir/scmroot/cantor'...
$ git fetch origin e60b6b9634818a05f83d4ac87d7ca6697c34b0f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cantor
 * [new ref]         e60b6b9634818a05f83d4ac87d7ca6697c34b0f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e60b6b9 R-maint-sig mass rebuild