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protoc

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Prototool wraps protoc for much of it's functionality, and manages the downloading and caching of protoc and the Well-Known Types definitions.

Prototool will automatically download and cache protoc if it has not already been downloaded, however the command prototool cache update can manually manage this process See faq.md for more details.

protoc is downloaded to the following directories based on flags and environment variables:

  • If --cache-path is set, then this directory will be used. The user is expected to manually manage this directory, and prototool cache delete will have no effect on it.
  • Otherwise, if $PROTOTOOL_CACHE_PATH is set, then this directory will be used. The user is expected to manually manage this directory, and prototool cache delete will have no effect on it.
  • Otherwise, if $XDG_CACHE_HOME is set, then $XDG_CACHE_HOME/prototool will be used.
  • Otherwise, if on Linux, $HOME/.cache/prototool will be used, or on Darwin, $HOME/Library/Caches/prototool will be used.

By default, protoc version 3.8.0 is downloaded, however this is configurable in your prototool.yaml file.

protoc:
  version: 3.8.0

Downloads are safe to run concurrently across processes, for example if using from Bazel, as Prototool implements file locking to make sure there is no contention on writing to the cache.

If one prefers to download and manage protoc and the Well-Known Types outside of Prototool, this can be done in one of three ways.

  • By setting the --protoc-url flag to provide an alternate URL to download the protoc ZIP file from instead of GitHub Releases. This can be prefixed with file://, http://, or https://, so one can either download the relevant protoc ZIP file from GitHub Releases and store it locally, or upload the relevant protoc ZIP file to i.e. s3 and download from therel.
  • By setting the --protoc-bin-path and --protoc-wkt-path flags at runtime for relevant commands. The Well-Known Type path should be the directory that includes the google/protobuf directory containing the Well-Known Types.
  • By setting the PROTOTOOL_PROTOC_BIN_PATH and PROTOTOOL_PROTOC_WKT_PATH environment variables, as we do in the provided Docker image. These variables are analagous to the --protoc-bin-path and --protoc-wkt-path flags, however the flags take precedence.

If any of these options are set, the protoc.version option in the prototool.yaml file is ignored.