$ git clone -n https://src.fedoraproject.org/rpms/ghc-haskell-src-exts.git /var/lib/mock/f33-build-160884-43420/root/chroot_tmpdir/scmroot/ghc-haskell-src-exts
Cloning into '/var/lib/mock/f33-build-160884-43420/root/chroot_tmpdir/scmroot/ghc-haskell-src-exts'...
$ git reset --hard 6d9516e4b3751dc81a1681f2b4371712920fb994
HEAD is now at 6d9516e update to 1.21.1