$ git clone -n https://src.fedoraproject.org/rpms/python-cramjam.git /var/lib/mock/f45-build-39728-751/root/chroot_tmpdir/scmroot/python-cramjam
Cloning into '/var/lib/mock/f45-build-39728-751/root/chroot_tmpdir/scmroot/python-cramjam'...
$ git fetch origin 1347c7256f1b45b5ed92fc12d699be893c578ba4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-cramjam
 * [new ref]         1347c7256f1b45b5ed92fc12d699be893c578ba4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1347c72 Update to 2.13.0 (close RHBZ#2543263)