$ git clone -n https://src.fedoraproject.org/rpms/plasma-thunderbolt.git /var/lib/mock/f40-build-2078147-49592/root/chroot_tmpdir/scmroot/plasma-thunderbolt
Cloning into '/var/lib/mock/f40-build-2078147-49592/root/chroot_tmpdir/scmroot/plasma-thunderbolt'...
$ git fetch origin df126c2170aa23d19b60e5847b6688aa1b3ccf99:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-thunderbolt
 * [new ref]         df126c2170aa23d19b60e5847b6688aa1b3ccf99 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df126c2 fix: upload missing sources