$ git clone -n https://src.fedoraproject.org/rpms/ghc-cryptohash-sha1.git /var/lib/mock/f40-build-743578-111265/root/chroot_tmpdir/scmroot/ghc-cryptohash-sha1
Cloning into '/var/lib/mock/f40-build-743578-111265/root/chroot_tmpdir/scmroot/ghc-cryptohash-sha1'...
$ git fetch origin a5e458c92872ba3713755b96bec8f373dde0d219:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cryptohash-sha1
 * [new ref]         a5e458c92872ba3713755b96bec8f373dde0d219 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5e458c revised .cabal file