$ git clone -n https://src.fedoraproject.org/rpms/ghc-cmdargs.git /var/lib/mock/f39-build-1711635-41228/root/chroot_tmpdir/scmroot/ghc-cmdargs
Cloning into '/var/lib/mock/f39-build-1711635-41228/root/chroot_tmpdir/scmroot/ghc-cmdargs'...
$ git fetch origin 808763d5aefcc53a3d67c2bf3b55bc1e060b17ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cmdargs
 * [new ref]         808763d5aefcc53a3d67c2bf3b55bc1e060b17ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 808763d https://hackage.haskell.org/package/cmdargs-0.10.22/changelog