$ git clone -n https://src.fedoraproject.org/rpms/libgexiv2.git /var/lib/mock/f41-build-813763-148788/root/chroot_tmpdir/scmroot/libgexiv2
Cloning into '/var/lib/mock/f41-build-813763-148788/root/chroot_tmpdir/scmroot/libgexiv2'...
$ git fetch origin 65e6af14e958a4c08c308ec177257ae6e344a25c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgexiv2
 * [new ref]         65e6af14e958a4c08c308ec177257ae6e344a25c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65e6af1 Update to 0.14.3