$ git clone -n https://src.fedoraproject.org/rpms/ghc-dataenc.git /var/lib/mock/f38-build-side-42-init-devel-763634-27709/root/chroot_tmpdir/scmroot/ghc-dataenc
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-763634-27709/root/chroot_tmpdir/scmroot/ghc-dataenc'...
$ git fetch origin 66a68baf84b83b648a518e88bfcdf2d225fe32c4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-dataenc
 * [new ref]         66a68baf84b83b648a518e88bfcdf2d225fe32c4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66a68ba Convert to %autorelease and %autochangelog