$ git clone -n https://src.fedoraproject.org/rpms/ghc-xml-hamlet.git /var/lib/mock/f39-build-1714624-41228/root/chroot_tmpdir/scmroot/ghc-xml-hamlet
Cloning into '/var/lib/mock/f39-build-1714624-41228/root/chroot_tmpdir/scmroot/ghc-xml-hamlet'...
$ git fetch origin fe3494a4e56b42f4f3b8efb06cfd33b6e8efd631:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-xml-hamlet
 * [new ref]         fe3494a4e56b42f4f3b8efb06cfd33b6e8efd631 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe3494a bump release