$ git clone -n https://src.fedoraproject.org/rpms/ghc-torrent.git /var/lib/mock/f38-build-side-42-init-devel-982921-29048/root/chroot_tmpdir/scmroot/ghc-torrent
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-982921-29048/root/chroot_tmpdir/scmroot/ghc-torrent'...
$ git fetch origin 194d95cdd6e777d19a32c0bfb8f2060020295ea8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-torrent
 * [new ref]         194d95cdd6e777d19a32c0bfb8f2060020295ea8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 194d95c Convert to %autorelease and %autochangelog