$ git clone -n git://pkgs.fedoraproject.org/rpms/esc /var/lib/mock/f29-build-2215-676/root/thebuilddir/tmp/scmroot/esc
Cloning into '/var/lib/mock/f29-build-2215-676/root/thebuilddir/tmp/scmroot/esc'...
$ git reset --hard 6dbb4cff1afb1fa775deea03d41742ec9b7aa629
HEAD is now at 6dbb4cf Exclude aarch64, because the former xulrunner package didn't support it either.