$ git clone -n https://src.fedoraproject.org/rpms/ghc-call-stack.git /var/lib/mock/f31-build-54118-27957/root/chroot_tmpdir/scmroot/ghc-call-stack
Cloning into '/var/lib/mock/f31-build-54118-27957/root/chroot_tmpdir/scmroot/ghc-call-stack'...
$ git reset --hard 309378b6e7962b27e908a79fa79743e78be4fc36
HEAD is now at 309378b refresh to cabal-rpm-0.13