$ git clone -n https://src.fedoraproject.org/rpms/ghc-scientific.git /var/lib/mock/f31-build-105493-33617/root/thebuilddir/tmp/scmroot/ghc-scientific
Cloning into '/var/lib/mock/f31-build-105493-33617/root/thebuilddir/tmp/scmroot/ghc-scientific'...
$ git reset --hard 44cac28810468833e2ee558215fbd0aed4d6cd81
HEAD is now at 44cac28 BR prof for lib and static for executable