$ git clone -n https://src.fedoraproject.org/rpms/ghc-SafeSemaphore.git /var/lib/mock/f31-build-53944-27924/root/chroot_tmpdir/scmroot/ghc-SafeSemaphore
Cloning into '/var/lib/mock/f31-build-53944-27924/root/chroot_tmpdir/scmroot/ghc-SafeSemaphore'...
$ git reset --hard c8f6c0eeca31e4a22b133ba7a6e2c4018299876e
HEAD is now at c8f6c0e refresh to cabal-rpm-0.13