commit ce8b7af46b82567c077611bae2e1285e04cfa7f2
author Thomas Van Lenten <thomasvl@google.com> Fri Jun 05 16:35:54 2020 -0400
committer Thomas Van Lenten <thomasvl@google.com> Tue Jun 09 09:57:17 2020 -0400
tree a88baae2fac19a1e87d5ed4e491ad1741b5b5917
parent 2655a0aa0f3a8984a80c886642f9969450aeccb2

Update the brew workflow

- Remove the `brew install`; the kokoro image already has it, just
  update/upgrade instead.
- Remove `prune`, logs had:
    """
    Error: Unknown command: prune
    """
- Remove `uninstall`, logs had:
    """
    Error: Refusing to uninstall /usr/local/Cellar/cmake/3.16.4 and /usr/local/Cellar/icu4c/64.2
    because they are required by ceres-solver, ffmpeg, harfbuzz, libass and opencv, which are currently installed.
    You can override this and force removal with:
      brew uninstall --ignore-dependencies node icu4c cmake wget
    """
- Skip installing some things since they are already in the base image, logs
  had:
    """
    Warning: gflags 2.2.2 is already installed and up-to-date
    To reinstall 2.2.2, run `brew reinstall gflags`
    Warning: openssl@1.1 1.1.1g is already installed and up-to-date
    To reinstall 1.1.1g, run `brew reinstall openssl@1.1`
    Warning: pcre 8.44 is already installed and up-to-date
    To reinstall 8.44, run `brew reinstall pcre`
    """
- Don't install gpg gpg2 as gnupg is already installed, also use gpg instead of
  gpg2 for commands (and update the commands), logs had:
    """
    kokoro/macos/prepare_build_macos_rc: line 44: gpg2: command not found
    kokoro/macos/prepare_build_macos_rc: line 45: gpg2: command not found
    """
- Add env guards to control all the option installs and only request them be
  installed in the cases that need it.  This avoids having to install/update
  the things like ruby when some other tool only needed in some configs is
  install differently and could have conflicts.
- Switch to brew for cocoapods to avoid compat issues on the supporting
  libraries.