$ git clone -n https://src.fedoraproject.org/rpms/cjs.git /var/lib/mock/f31-build-61548-28936/root/thebuilddir/tmp/scmroot/cjs
Cloning into '/var/lib/mock/f31-build-61548-28936/root/thebuilddir/tmp/scmroot/cjs'...
$ git reset --hard ef2d22b204c258f51e96f07bde17db53ef7484db
HEAD is now at ef2d22b - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild