|  | @@ -100,5 +100,19 @@ RUN /bin/bash -l -c "rvm all do gem install ronn rake"
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				|  |  |  RUN curl -sS https://getcomposer.org/installer | php
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				|  |  |  RUN mv composer.phar /usr/local/bin/composer
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				|  |  |  
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				|  |  | +# Download the patched PHP protobuf so that PHP gRPC clients can be generated
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				|  |  | +# from proto3 schemas.
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				|  |  | +RUN git clone https://github.com/stanley-cheung/Protobuf-PHP.git /var/local/git/protobuf-php
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				|  |  | +
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				|  |  | +RUN /bin/bash -l -c "rvm use ruby-2.1 \
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				|  |  | +  && cd /var/local/git/protobuf-php \
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				|  |  | +  && rvm all do rake pear:package version=1.0 \
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				|  |  | +  && pear install Protobuf-1.0.tgz"
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				|  |  | +
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				|  |  | +# As an attempt to work around #4212, try to prefetch Protobuf-PHP dependency
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				|  |  | +# into composer cache to prevent "composer install" from cloning on each build.
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				|  |  | +RUN git clone --mirror https://github.com/stanley-cheung/Protobuf-PHP.git \
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				|  |  | +  /root/.composer/cache/vcs/git-github.com-stanley-cheung-Protobuf-PHP.git/
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				|  |  | +
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				|  |  |  # Define the default command.
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				|  |  |  CMD ["bash"]
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