$ git clone -n https://src.fedoraproject.org/rpms/jc.git /var/lib/mock/f40-build-2670403-67319/root/chroot_tmpdir/scmroot/jc
Cloning into '/var/lib/mock/f40-build-2670403-67319/root/chroot_tmpdir/scmroot/jc'...
$ git fetch origin 3da2e4eefa4ea23a5185a7f1148432ef7b6101a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jc
 * [new ref]         3da2e4eefa4ea23a5185a7f1148432ef7b6101a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3da2e4e Update to v1.25.2