$ git clone -n https://src.fedoraproject.org/rpms/ghc-call-stack.git /var/lib/mock/f31-build-99580-33178/root/chroot_tmpdir/scmroot/ghc-call-stack
Cloning into '/var/lib/mock/f31-build-99580-33178/root/chroot_tmpdir/scmroot/ghc-call-stack'...
$ git reset --hard 708fe7d3aaa9e17d831ab35c14723b030e7ea1f8
HEAD is now at 708fe7d BR prof for lib and static for executable