$ git clone -n https://src.fedoraproject.org/rpms/libre.git /var/lib/mock/f41-build-856254-167516/root/chroot_tmpdir/scmroot/libre
Cloning into '/var/lib/mock/f41-build-856254-167516/root/chroot_tmpdir/scmroot/libre'...
$ git fetch origin a2b423cdb24f54b5d5db48df68898e636e728b59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libre
 * [new ref]         a2b423cdb24f54b5d5db48df68898e636e728b59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2b423c Upgrade to 3.16.0 (#2316094)