$ git clone -n https://src.fedoraproject.org/rpms/ghc-Diff.git /var/lib/mock/f38-build-side-42-init-devel-737665-27649/root/chroot_tmpdir/scmroot/ghc-Diff
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-737665-27649/root/chroot_tmpdir/scmroot/ghc-Diff'...
$ git fetch origin 098630208213626ae921e5f62532e545d9220091:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-Diff
 * [new ref]         098630208213626ae921e5f62532e545d9220091 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0986302 Convert to %autorelease and %autochangelog