$ git clone -n https://src.fedoraproject.org/rpms/ghc-StateVar.git /var/lib/mock/f38-build-side-42-init-devel-925595-28744/root/chroot_tmpdir/scmroot/ghc-StateVar
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-925595-28744/root/chroot_tmpdir/scmroot/ghc-StateVar'...
$ git fetch origin 19d096173acb322e243d41d59e221c704b9f8ace:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-StateVar
 * [new ref]         19d096173acb322e243d41d59e221c704b9f8ace -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19d0961 Convert to %autorelease and %autochangelog