$ git clone -n https://src.fedoraproject.org/rpms/ghc-cryptohash-md5.git /var/lib/mock/f40-build-743575-111265/root/chroot_tmpdir/scmroot/ghc-cryptohash-md5
Cloning into '/var/lib/mock/f40-build-743575-111265/root/chroot_tmpdir/scmroot/ghc-cryptohash-md5'...
$ git fetch origin 3e6ddd1397153fec549d6d20e7476667277a61ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cryptohash-md5
 * [new ref]         3e6ddd1397153fec549d6d20e7476667277a61ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e6ddd1 revised .cabal file