$ git clone -n https://src.fedoraproject.org/rpms/ghc-hakyll.git /var/lib/mock/f41-build-840850-160994/root/chroot_tmpdir/scmroot/ghc-hakyll
Cloning into '/var/lib/mock/f41-build-840850-160994/root/chroot_tmpdir/scmroot/ghc-hakyll'...
$ git fetch origin 623c9ba38f6033645f837cf1365a3abfdc6b0b42:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hakyll
 * [new ref]         623c9ba38f6033645f837cf1365a3abfdc6b0b42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 623c9ba https://hackage.haskell.org/package/hakyll-4.16.2.2/changelog