$ git clone -n https://src.fedoraproject.org/rpms/nordugrid-arc.git /var/lib/mock/f39-build-1629189-39524/root/chroot_tmpdir/scmroot/nordugrid-arc
Cloning into '/var/lib/mock/f39-build-1629189-39524/root/chroot_tmpdir/scmroot/nordugrid-arc'...
$ git fetch origin 7bcba0b546affd3ca80cfb4f587b3f669805d6fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nordugrid-arc
 * [new ref]         7bcba0b546affd3ca80cfb4f587b3f669805d6fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7bcba0b Update to version 6.18.0