$ git clone -n https://src.fedoraproject.org/rpms/calibre.git /var/lib/mock/f41-build-1465514-23647/root/chroot_tmpdir/scmroot/calibre
Cloning into '/var/lib/mock/f41-build-1465514-23647/root/chroot_tmpdir/scmroot/calibre'...
$ git fetch origin 3906868a220e1b6a71eed1d2f8f8d20184fc8357:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/calibre
 * [new ref]         3906868a220e1b6a71eed1d2f8f8d20184fc8357 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3906868 correct path for liberation fonts