$ git clone -n https://src.fedoraproject.org/rpms/libcdr.git /var/lib/mock/f45-build-15980-481/root/chroot_tmpdir/scmroot/libcdr
Cloning into '/var/lib/mock/f45-build-15980-481/root/chroot_tmpdir/scmroot/libcdr'...
$ git fetch origin 7817c6b6b33a8967cdf8eb9e823857c95c75db52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcdr
 * [new ref]         7817c6b6b33a8967cdf8eb9e823857c95c75db52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7817c6b Update to new upstream release