104 lines
3.7 KiB
Markdown
104 lines
3.7 KiB
Markdown
# Jsonnet Sandboxed API
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This library was sandboxed as part of Google's summer 2020 internship program
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([blog post](https://security.googleblog.com/2020/12/improving-open-source-security-during.html)).
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This directory contains a sandbox for the
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[Jsonnet](https://github.com/google/jsonnet) library.
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## How to use from an existing Project
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If your project does not include Sandboxed API as a dependency yet, add the
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following lines to the main `CMakeLists.txt`:
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```cmake
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include(FetchContent)
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FetchContent_Declare(sandboxed-api
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GIT_REPOSITORY https://github.com/google/sandboxed-api
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GIT_TAG main # Or pin a specific commit/tag
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)
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FetchContent_MakeAvailable(sandboxed-api) # CMake 3.14 or higher
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add_sapi_subdirectory(contrib/jsonnet)
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```
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The `add_sapi_subdirectory()` macro sets up the source and binary directories
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for the sandboxed jsonnet targets.
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Afterwards your project's code can link to `sapi_contrib::jsonnet` and use the
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corresponding header `contrib/jsonnet/jsonnet_base_sandbox.h`.
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## Examples
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The `examples/` directory contains code to produce three command-line tools --
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`jsonnet_sandboxed`, `jsonnet_yaml_stream_sandboxed` and
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`jsonnet_multiple_files_sandboxed` to evaluate jsonnet code. The first one
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enables the user to evaluate jsonnet code held in one file and writing to one
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output file. The second evaluates one jsonnet file into one file, which can be
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interepreted as YAML stream. The third one is for evaluating one jsonnet file
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into multiple output files. All three tools are based on what can be found
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[here](https://github.com/google/jsonnet/blob/master/cmd/jsonnet.cpp).
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Apart from these, there is also a file producing `jsonnet_formatter_sandboxed`
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executable. It is based on a tool found from
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[here](https://github.com/google/jsonnet/blob/master/cmd/jsonnetfmt.cpp). It is
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a jsonnet code formatter -- it changes poorly written jsonnet files into their
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canonical form.
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### Build as part of Sandboxed API
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To build these examples, after cloning the whole Sandbox API project, run this
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in the `contrib/jsonnet` directory:
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```
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mkdir -p build && cd build
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cmake .. -G Ninja -Wno-dev -DSAPI_BUILD_TESTING=ON
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ninja
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```
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To run `jsonnet_sandboxed` (or `jsonnet_yaml_stream_sandboxed` or
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`jsonnet_formatter_sandboxed` in a similar way):
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```
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cd examples
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./jsonnet_sandboxed \
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absolute/path/to/the/input_file.jsonnet \
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absolute/path/to/the/output_file
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```
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To run `jsonnet_mutiple_files_sandboxed`:
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```
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cd examples
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./jsonnet_mutiple_files_sandboxed \
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absolute/path/to/the/input_file.jsonnet \
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absolute/path/to/the/output_directory
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```
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All three tools support evaluating one input file (possibly relying on multiple
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other files, e.x. by jsonnet `import` command; the files must be held in the
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same directory as input file) into one or more output files. Example jsonnet
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codes to evaluate in a one-in-one-out manner can be found
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[here](https://github.com/google/jsonnet/tree/master/examples). Example code
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producing multiple output files or YAML stream files can be found in the
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`examples/jsonnet_codes` directory (along with some other examples copied with
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minimal changes from the library files), in files called
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`multiple_files_example.jsonnet` and `yaml_stream_example.jsonnet`,
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respectively. In the `examples/jsonnet_codes_expected_output` directory one can
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found outputs the mentioned above files' evaluation should produce.
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The formatter reads one input file and produces one output file as a result.
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Example code for this tool can also be found in `examples/jsonnet_codes`
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directory, in a file called `formatter_example.jsonnet`.
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### Running the tests
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A few tests prepared with a use of
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[Google Test](https://github.com/google/googletest) framework are included. To
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run them type:
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```
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ctest -R JsonnetTest.
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```
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