$ git clone -n https://src.fedoraproject.org/rpms/exiv2.git /var/lib/mock/f45-build-8543-390/root/chroot_tmpdir/scmroot/exiv2
Cloning into '/var/lib/mock/f45-build-8543-390/root/chroot_tmpdir/scmroot/exiv2'...
$ git fetch origin be37401175499ee4f646e36d3e29611b03066358:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/exiv2
 * [new ref]         be37401175499ee4f646e36d3e29611b03066358 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be37401 Update to 0.28.9