$ git clone -n https://src.fedoraproject.org/rpms/ghc-hjsmin.git /var/lib/mock/f39-build-2097782-50435/root/chroot_tmpdir/scmroot/ghc-hjsmin
Cloning into '/var/lib/mock/f39-build-2097782-50435/root/chroot_tmpdir/scmroot/ghc-hjsmin'...
$ git fetch origin 2964fd1919304db9d2dffcd0a4970f79d3feb1b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hjsmin
 * [new ref]         2964fd1919304db9d2dffcd0a4970f79d3feb1b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2964fd1 https://hackage.haskell.org/package/hjsmin-0.2.1/changelog