$ git clone -n https://src.fedoraproject.org/rpms/ghc-haskell-src-meta.git /var/lib/mock/f40-build-770344-125843/root/chroot_tmpdir/scmroot/ghc-haskell-src-meta
Cloning into '/var/lib/mock/f40-build-770344-125843/root/chroot_tmpdir/scmroot/ghc-haskell-src-meta'...
$ git fetch origin 273dc690a2ce2aea0008e8640ed6897696d30477:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-haskell-src-meta
 * [new ref]         273dc690a2ce2aea0008e8640ed6897696d30477 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 273dc69 https://hackage.haskell.org/package/haskell-src-meta-0.8.12/changelog