$ git clone -n https://src.fedoraproject.org/rpms/exim.git /var/lib/mock/f31-build-96354-32806/root/thebuilddir/tmp/scmroot/exim
Cloning into '/var/lib/mock/f31-build-96354-32806/root/thebuilddir/tmp/scmroot/exim'...
$ git reset --hard 1b7d96c8266ad63952ac2fbd187f873f1a0ba367
HEAD is now at 1b7d96c New version