$ git clone -n https://src.fedoraproject.org/rpms/libfabric.git /var/lib/mock/f40-build-786258-134210/root/chroot_tmpdir/scmroot/libfabric
Cloning into '/var/lib/mock/f40-build-786258-134210/root/chroot_tmpdir/scmroot/libfabric'...
$ git fetch origin 6712b680cdf160331e2d7da92f80162fe3edbcd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libfabric
 * [new ref]         6712b680cdf160331e2d7da92f80162fe3edbcd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6712b68 Update to 1.20.1