$ git clone -n https://src.fedoraproject.org/rpms/plasma-workspace-wallpapers.git /var/lib/mock/f40-build-2078163-49592/root/chroot_tmpdir/scmroot/plasma-workspace-wallpapers
Cloning into '/var/lib/mock/f40-build-2078163-49592/root/chroot_tmpdir/scmroot/plasma-workspace-wallpapers'...
$ git fetch origin 474e4a94040d4bcc8f375f48b5968ebbf3e6fc80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-workspace-wallpapers
 * [new ref]         474e4a94040d4bcc8f375f48b5968ebbf3e6fc80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 474e4a9 fix: upload missing sources