Merge #17176: ci: Cleanup macOS runs

fa677d1801fb9153a95a1fc9855fd5f21fc440c0 ci: Remove redundant check for TRAVIS_OS_NAME (MarcoFalke)
fadccb263baf6b8694f750623add42f966e423a3 doc: Document that GNU tools are required for linters (MarcoFalke)
4444704ca9f66cdc24ab2d444941354db1dfed06 ci: Cleanup macOS runs (MarcoFalke)

Pull request description:

  * Remove a commented out cleanup task in `before_cache`
  * Remove the linter run on macOS, and document that GNU tools are required to run the linters

ACKs for top commit:
  Sjors:
    Code review ACK fa677d1801fb9153a95a1fc9855fd5f21fc440c0
  laanwj:
    ACK fa677d1801fb9153a95a1fc9855fd5f21fc440c0
  ryanofsky:
    Code review ACK fa677d1801fb9153a95a1fc9855fd5f21fc440c0 for new third commit replacing TRAVIS_OS_NAME check with NO_DEPENDS setting

Tree-SHA512: 9122a63bbe7887d9e379123152ea4ba44324cb18033b9e6b45bfdb1af665c10ea598564b9fcd57330d208a08e4696e41b4d6175f05f0843a3a76530da114f8c6

.travis.yml

@@ -202,28 +202,6 @@ after_success:
       script:
         - set -o errexit; source ./ci/extended_lint/06_script.sh
 
-    - stage: extended-lint
-      name: 'lint macOS 10.12 (compat)'
-      os: osx
-      # Use the earliest macOS that can build our lint dependencies:
-      # Xcode 8.3.3, macOS 10.12, JDK 1.8.0_112-b16
-      # https://docs.travis-ci.com/user/reference/osx/#OS-X-Version
-      osx_image: xcode8.3
-      # TODO: if you're updating osx_image, try using "rvm:" to supply the
-      # version of ruby required by homebrew. Despite this "rvm:" declaration,
-      # brew update installs ruby 2.3.7 as its first action.
-      language: ruby
-      rvm:
-        - 2.3.7
-      env:
-      cache: false
-      install:
-        - set -o errexit; source ./ci/lint/04_install.sh
-      before_script:
-        - set -o errexit; source ./ci/lint/05_before_script.sh
-      script:
-        - set -o errexit; source ./ci/lint/06_script.sh
-
     - stage: test
       name: 'ARM  [GOAL: install]  [unit tests, no functional tests]'
       env: >-

ci/lint/04_install.sh

@@ -6,24 +6,11 @@
 
 export LC_ALL=C
 
-if [ "$TRAVIS_OS_NAME" == "osx" ]; then
-  # update first to install required ruby dependency
-  travis_retry brew update
-  travis_retry brew reinstall git -- --with-pcre2 # for  --perl-regexp
-  travis_retry brew install grep # gnu grep for --perl-regexp support
-  PATH="$(brew --prefix grep)/libexec/gnubin:$PATH"
-  travis_retry brew install shellcheck
-  travis_retry brew upgrade python
-  PATH="$(brew --prefix python)/bin:$PATH"
-  export PATH
-else
-  SHELLCHECK_VERSION=v0.7.1
-  curl -sL "https://github.com/koalaman/shellcheck/releases/download/${SHELLCHECK_VERSION}/shellcheck-${SHELLCHECK_VERSION}.linux.x86_64.tar.xz" | tar --xz -xf - --directory /tmp/
-  PATH="/tmp/shellcheck-${SHELLCHECK_VERSION}:${PATH}"
-  export PATH
-fi
-
 travis_retry pip3 install codespell==1.17.1
 travis_retry pip3 install flake8==3.8.3
 travis_retry pip3 install vulture==2.3
 travis_retry pip3 install yq
+
+SHELLCHECK_VERSION=v0.6.0
+curl -s "https://storage.googleapis.com/shellcheck/shellcheck-${SHELLCHECK_VERSION}.linux.x86_64.tar.xz" | tar --xz -xf - --directory /tmp/
+export PATH="/tmp/shellcheck-${SHELLCHECK_VERSION}:${PATH}"

test/lint/README.md

@@ -7,6 +7,8 @@ Check for missing documentation of command line options.
 commit-script-check.sh
 ======================
 Verification of [scripted diffs](/doc/developer-notes.md#scripted-diffs).
+Scripted diffs are only assumed to run on the latest LTS release of Ubuntu. Running them on other operating systems
+might require installing GNU tools, such as GNU sed.
 
 git-subtree-check.sh
 ====================