$ git clone -n https://src.fedoraproject.org/rpms/ghc-stm-chans.git /var/lib/mock/f33-build-289144-54272/root/chroot_tmpdir/scmroot/ghc-stm-chans
Cloning into '/var/lib/mock/f33-build-289144-54272/root/chroot_tmpdir/scmroot/ghc-stm-chans'...
$ git reset --hard 77a9dc94982fa9fbcc5c0d301521f980d474f95e
HEAD is now at 77a9dc9 - Second attempt - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild