$ git clone -n https://src.fedoraproject.org/rpms/ghc-regex-base.git /var/lib/mock/f40-build-742317-110720/root/chroot_tmpdir/scmroot/ghc-regex-base
Cloning into '/var/lib/mock/f40-build-742317-110720/root/chroot_tmpdir/scmroot/ghc-regex-base'...
$ git reset --hard c3797655b99dc212b6f9403ae89f17fad7c2024a
HEAD is now at c379765 revised .cabal file