$ git clone -n https://src.fedoraproject.org/rpms/c4fs.git /var/lib/mock/f45-build-4910-336/root/chroot_tmpdir/scmroot/c4fs
Cloning into '/var/lib/mock/f45-build-4910-336/root/chroot_tmpdir/scmroot/c4fs'...
$ git fetch origin c2c86e536c9725a943d7936cf11c8d6a8cb89ae0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/c4fs
 * [new ref]         c2c86e536c9725a943d7936cf11c8d6a8cb89ae0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2c86e5 Patched and rebuilt for c4core 0.6.0