$ git clone -n https://src.fedoraproject.org/rpms/ghc-STMonadTrans.git /var/lib/mock/f31-build-53943-27924/root/chroot_tmpdir/scmroot/ghc-STMonadTrans
Cloning into '/var/lib/mock/f31-build-53943-27924/root/chroot_tmpdir/scmroot/ghc-STMonadTrans'...
$ git reset --hard c39254a396daa5bbd16c6aa810131a4e18cb8e3b
HEAD is now at c39254a refresh to cabal-rpm-0.13