$ git clone -n https://src.fedoraproject.org/rpms/opam.git /var/lib/mock/f31-build-48856-27197/root/thebuilddir/tmp/scmroot/opam
Cloning into '/var/lib/mock/f31-build-48856-27197/root/thebuilddir/tmp/scmroot/opam'...
$ git reset --hard b715f6d6b2440e514c760e1ced5b5b138043bbd3
HEAD is now at b715f6d - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild