$ git clone -n https://src.fedoraproject.org/rpms/ghc-hakyll.git /var/lib/mock/f39-build-1937868-43139/root/chroot_tmpdir/scmroot/ghc-hakyll
Cloning into '/var/lib/mock/f39-build-1937868-43139/root/chroot_tmpdir/scmroot/ghc-hakyll'...
$ git fetch origin dfe765a607659be1ee4f5a4005f7e1df618d0d36:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hakyll
 * [new ref]         dfe765a607659be1ee4f5a4005f7e1df618d0d36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfe765a https://hackage.haskell.org/package/hakyll-4.16.2.0/changelog