.travis.yml: Simplify Travis CI.

* Remove CI functions for make test-all.
  I want to simplify the `.travis.yml` for us to maintain it easily. When we
  need to skip a test, we can fix the test file directly.
  I removed the `tool/ci_functions.sh` too. I confirmed the file is not used in
  any other files.
* .travis.yml: Remove a notification for IRC channel.
  GitHub Actions don't use this notification. The setting is outdated.
* Fix to skip the commit including the document keyword.
  There were 2 `if` syntax lines in the file.
* Remove ccache.

1 files changed, 14 insertions, 115 deletions

diff --git a/.travis.yml b/.travis.yml
index bfae9130f3..a2a4dd3f55 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,44 +6,27 @@
 # conditions  mentioned in  the file  COPYING are  met.  Consult  the  file for
 # details.
 
-# We only manage non-amd64 free pipelines.
+# Note we only manage non-amd64 free pipelines.
 # https://docs.travis-ci.com/user/billing-overview/
 
+# We enable Travis on the specific branches or forked repositories here.
+if: (repo = ruby/ruby AND (branch = master OR branch =~ /^ruby_\d_\d$/)) OR repo != ruby/ruby OR commit_message !~ /\[DOC\]/
+
 language: c
 
 os: linux
 
-if: commit_message !~ /\[DOC\]/
-
 dist: focal
 
 git:
   quiet: true
 
-cache:
-  ccache: true
-  directories:
-    - $HOME/config_2nd
-    - $HOME/.downloaded-cache
-
 env:
   global:
-    # The tests skipped in `make test-all`.
-    - TEST_ALL_SKIPPED_TESTS=
-    # The tests executed separately by `make test-all`.
-    - TEST_ALL_SEPARATED_TESTS=
-    # Reset timestamps early
-    - _=$(touch NEWS && find . -type f -exec touch -r NEWS {} +)
-    - CONFIGURE_TTY=no
-    - CCACHE_COMPILERCHECK=none
-    - CCACHE_NOCOMPRESS=1
-    - CCACHE_MAXSIZE=512Mi
-    - NPROC="`nproc`"
+    - NPROC="$(nproc)"
     # JOBS and SETARCH are overridden when necessary; see below.
     - JOBS=-j$((1+${NPROC}))
     - SETARCH=
-    - RUBY_PREFIX=/tmp/ruby-prefix
-    - GEMS_FOR_TEST='timezone tzinfo'
     # https://github.com/travis-ci/travis-build/blob/e411371dda21430a60f61b8f3f57943d2fe4d344/lib/travis/build/bash/travis_apt_get_options.bash#L7
     - travis_apt_get_options='--allow-downgrades --allow-remove-essential --allow-change-held-packages'
     - travis_apt_get_options="-yq --no-install-suggests --no-install-recommends $travis_apt_get_options"
@@ -51,16 +34,15 @@ env:
     - optflags=-O1
     # -g0 disables backtraces when SEGV.  Do not set that.
     - debugflags=-ggdb3
+    - RUBY_TESTOPTS="$JOBS -q --tty=no"
 
 .org.ruby-lang.ci.matrix-definitions:
-
   - &gcc-10
     compiler: gcc-10
     before_install:
       - tool/travis_retry.sh sudo bash -c "rm -rf '${TRAVIS_ROOT}/var/lib/apt/lists/'* && exec apt-get update -yq"
       - >-
         tool/travis_retry.sh sudo -E apt-get $travis_apt_get_options install
-        ccache
         gcc-10
         g++-10
         libffi-dev
@@ -72,8 +54,6 @@ env:
         openssl
         zlib1g-dev
 
-  # --------
-
   - &arm64-linux
     name: arm64-linux
     arch: arm64
@@ -102,15 +82,11 @@ env:
     compiler: arm-linux-gnueabihf-gcc
     env:
       - SETARCH='setarch linux32 --verbose --32bit'
-      # The "TestReadline#test_interrupt_in_other_thread" started failing on arm32
-      # from https://www.travis-ci.com/github/ruby/ruby/jobs/529005145
-      - TEST_ALL_SKIPPED_TESTS=test_interrupt_in_other_thread
     before_install:
       - sudo dpkg --add-architecture armhf
       - tool/travis_retry.sh sudo bash -c "rm -rf '${TRAVIS_ROOT}/var/lib/apt/lists/'* && exec apt-get update -yq"
       - >-
         tool/travis_retry.sh sudo -E apt-get $travis_apt_get_options install
-        ccache
         crossbuild-essential-armhf
         libc6:armhf
         libstdc++-10-dev:armhf
@@ -132,105 +108,28 @@ matrix:
     - <<: *ppc64le-linux
     - <<: *s390x-linux
   allow_failures:
-    # We see multiple errors indicating errors on the Travis environment itself in a short while:
-    # https://app.travis-ci.com/github/ruby/ruby/jobs/544382885
-    # https://app.travis-ci.com/github/ruby/ruby/jobs/544361370
-    # It's not a fault of Ruby's arm32 support but just Travis arm32 seems unsable.
+    # Allow failures for the unstable jobs.
     - name: arm32-linux
     # - name: arm64-linux
-    # We see "Some worker was crashed." in about 40% of recent ppc64le-linux jobs
-    # e.g. https://app.travis-ci.com/github/ruby/ruby/jobs/530959548
     - name: ppc64le-linux
-    # Tentatively disable, because often hungs up **after** all tests
-    # have finished successfully and saving caches.
     - name: s390x-linux
   fast_finish: true
 
 before_script:
-  - . tool/ci_functions.sh
-  - |-
-    if [ -n "${TEST_ALL_SKIPPED_TESTS}" ]; then
-      TEST_ALL_OPTS="${TEST_ALL_OPTS} $(ci_to_excluded_test_opts "${TEST_ALL_SKIPPED_TESTS}")"
-      if [ -z "${TEST_ALL_SEPARATED_TESTS}" ]; then
-        TEST_ALL_SEPARATED_TESTS="${TEST_ALL_SKIPPED_TESTS}"
-      fi
-    fi
-  - |-
-    if [ -n "${TEST_ALL_SEPARATED_TESTS}" ]; then
-      TEST_ALL_OPTS_SEPARATED="$(ci_to_included_test_opts "${TEST_ALL_SEPARATED_TESTS}")"
-    fi
-  - echo TEST_ALL_OPTS="${TEST_ALL_OPTS}" TEST_ALL_OPTS_SEPARATED="${TEST_ALL_OPTS_SEPARATED}"
-  - rm -fr .ext autom4te.cache
-  - |-
-    [ -d ~/.downloaded-cache ] ||
-    mkdir ~/.downloaded-cache
-  - ln -s ~/.downloaded-cache
-  - "> config.status"
-  - "> .rbconfig.time"
-  - sed -f tool/prereq.status template/Makefile.in common.mk > Makefile
-  - make -s $JOBS up
-  - make -s $JOBS srcs
-  - rm -f config.status Makefile rbconfig.rb .rbconfig.time
-  - |-
-    if [ -d ~/config_2nd ]; then
-      cp -pr ~/config_2nd build
-    else
-      mkdir build
-    fi
-  - mkdir config_1st config_2nd gems/src
-  - chmod -R a-w .
-  - chmod -R u+w build config_1st config_2nd gems/src .bundle
+  - ./autogen.sh
+  - mkdir build
   - cd build
-  - |-
-    case "$CC" in
-    gcc*)   CC="ccache $CC${GCC_FLAGS:+ }$GCC_FLAGS -fno-diagnostics-color";;
-    clang*) CC="ccache $CC${GCC_FLAGS:+ }$GCC_FLAGS -fno-color-diagnostics";;
-    esac
-  - |-
-    [ ! -f config.cache ] ||
-    [ "$CC" = "`sed -n s/^ac_cv_prog_CC=//p config.cache`" ] ||
-    (set -x; exec rm config.cache)
-  - $SETARCH ../configure -C --disable-install-doc --prefix=$RUBY_PREFIX $CONFIG_FLAG
-  - cp -pr config.cache config.status .ext/include ../config_1st
-  - $SETARCH make reconfig
-  - cp -pr config.cache config.status .ext/include ../config_2nd
-  - (cd .. && exec diff -ru config_1st config_2nd)
-  - chmod u+w ..
-  - rm -rf ~/config_2nd
-  - mv ../config_2nd ~
-  - chmod u-w ..
+  - $SETARCH ../configure -C --disable-install-doc --prefix=$(pwd)/install
   - $SETARCH make -s $JOBS
-  - make -s install
-  - |-
-    [ -z "${GEMS_FOR_TEST}" ] ||
-    $RUBY_PREFIX/bin/gem install --no-document $GEMS_FOR_TEST
-  - echo "raise 'do not load ~/.irbrc in test'" > ~/.irbrc
+  - make -s $JOBS install
 
 script:
-  - $SETARCH make -s test -o showflags TESTOPTS="${TESTOPTS=$JOBS -q --tty=no}"
-  - ../tool/travis_wait.sh $SETARCH make -s test-all -o exts TESTOPTS="$JOBS -q --tty=no ${TEST_ALL_OPTS}" RUBYOPT="-w"
-  # Run the failing tests separately returning ok status to check if it works,
-  # visualize them.
-  - |
-    if [ -n "${TEST_ALL_OPTS_SEPARATED}" ]; then
-      $SETARCH make -s test-all -o exts TESTOPTS="$JOBS -v --tty=no ${TEST_ALL_OPTS_SEPARATED}" RUBYOPT="-w" || :
-    fi
-  - $SETARCH make -s test-spec # not using `-j` because sometimes `mspec -j` silently dies
-  - $SETARCH make -s -o showflags leaked-globals
-
-# We enable Travis on the specific branches or forked repositories here.
-if: (repo = ruby/ruby AND (branch = master OR branch =~ /^ruby_\d_\d$/)) OR repo != ruby/ruby
+  - $SETARCH make -s test
+  - ../tool/travis_wait.sh $SETARCH make -s test-all RUBYOPT="-w"
+  - $SETARCH make -s test-spec
 
 # We want to be notified when something happens.
 notifications:
-  irc:
-    channels:
-      - "chat.freenode.net#ruby-core"
-    on_success: change # [always|never|change] # default: always
-    on_failure: always # [always|never|change] # default: always
-    template:
-      - "%{message} by @%{author}: See %{build_url}"
-
   webhooks:
     urls:
       - secure: mRsoS/UbqDkKkW5p3AEqM27d4SZnV6Gsylo3bm8T/deltQzTsGzZwrm7OIBXZv0UFZdE68XmPlyHfZFLSP2V9QZ7apXMf9/vw0GtcSe1gchtnjpAPF6lYBn7nMCbVPPx9cS0dwL927fjdRM1vj7IKZ2bk4F0lAJ25R25S6teqdk= # ruby-lang slack: ruby/simpler-alerts-bot (travis)