$ git clone -n https://src.fedoraproject.org/rpms/lld17.git /var/lib/mock/f40-build-799380-142308/root/chroot_tmpdir/scmroot/lld17
Cloning into '/var/lib/mock/f40-build-799380-142308/root/chroot_tmpdir/scmroot/lld17'...
$ git fetch origin 5f82a89438ad0a26a49965cf3fa38b9c1b1970c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lld17
 * [new ref]         5f82a89438ad0a26a49965cf3fa38b9c1b1970c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f82a89 Import from lld repo