$ git clone -n https://src.fedoraproject.org/rpms/ghc-concurrent-extra.git /var/lib/mock/f31-build-99644-33187/root/chroot_tmpdir/scmroot/ghc-concurrent-extra
Cloning into '/var/lib/mock/f31-build-99644-33187/root/chroot_tmpdir/scmroot/ghc-concurrent-extra'...
$ git reset --hard f4da99d22d04b6464c641ac08c6867da1230c4a1
HEAD is now at f4da99d BR prof for lib and static for executable