$ git clone -n https://src.fedoraproject.org/rpms/ghc-formatting.git /var/lib/mock/f39-build-1507651-35285/root/chroot_tmpdir/scmroot/ghc-formatting
Cloning into '/var/lib/mock/f39-build-1507651-35285/root/chroot_tmpdir/scmroot/ghc-formatting'...
$ git fetch origin 52c2e198dfb09efeb7998ad1e41acb87a51c7db3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-formatting
 * [new ref]         52c2e198dfb09efeb7998ad1e41acb87a51c7db3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52c2e19 https://hackage.haskell.org/package/formatting-7.2.0/changelog