Merge #20691: ci, doc: Travis CI features and mentions cleanup

95487b055328b590ba83f258de9637ab0f9a2f17 doc: Drop mentions of Travis CI as it is no longer used (Hennadii Stepanov)
09d105ef0f8b4b06bf248721a1209c9e16e9db75 ci: Drop travis_fold feature as Travis CI is no longer used (Hennadii Stepanov)

Pull request description:

  As Travis CI is no longer used, this PR:
  - drops `travis_fold` feature
  - drops mentions of Travis CI in docs

ACKs for top commit:
  MarcoFalke:
    ACK 95487b055328b590ba83f258de9637ab0f9a2f17

Tree-SHA512: 2e259bb8b1e37bcefc1251737bb2716f06ddb57c490010b373825c4e70f42ca38efae69a2f63f21f577d7cee3725b94097bdddbd313f8ebf499281cf97c53cef

10 files changed, 7 insertions, 61 deletions

diff --git a/.cirrus.yml b/.cirrus.yml
index 0507d664f1..34541011e9 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -72,8 +72,6 @@ task:
   << : *CREDITS_TEMPLATE
   setup_script:
     - set -o errexit; source ./ci/test/00_setup_env.sh
-  before_install_script:
-    - set -o errexit; source ./ci/test/03_before_install.sh
   install_script:
     - set -o errexit; source ./ci/lint/04_install.sh
   before_script:
diff --git a/README.md b/README.md
index 312e2d00ec..c73e25c429 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,8 @@ There are also [regression and integration tests](/test), written
 in Python, that are run automatically on the build server.
 These tests can be run (if the [test dependencies](/test) are installed) with: `test/functional/test_runner.py`
 
-The Travis CI system makes sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.
+The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS,
+and that unit/sanity tests are run automatically.
 
 ### Manual Quality Assurance (QA) Testing
 
diff --git a/ci/test/03_before_install.sh b/ci/test/03_before_install.sh
deleted file mode 100755
index 80806aab75..0000000000
--- a/ci/test/03_before_install.sh
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/usr/bin/env bash
-#
-# Copyright (c) 2018-2019 The Bitcoin Core developers
-# Distributed under the MIT software license, see the accompanying
-# file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-export LC_ALL=C.UTF-8
-
-BEGIN_FOLD () {
-  echo ""
-  CURRENT_FOLD_NAME=$1
-  echo "travis_fold:start:${CURRENT_FOLD_NAME}"
-}
-
-END_FOLD () {
-  RET=$?
-  echo "travis_fold:end:${CURRENT_FOLD_NAME}"
-  if [ $RET != 0 ]; then
-    echo "${CURRENT_FOLD_NAME} failed with status code ${RET}"
-  fi
-}
-
diff --git a/ci/test/05_before_script.sh b/ci/test/05_before_script.sh
index d7dd5d9dec..4644f28a4e 100755
--- a/ci/test/05_before_script.sh
+++ b/ci/test/05_before_script.sh
@@ -47,7 +47,5 @@ if [ -z "$NO_DEPENDS" ]; then
   DOCKER_EXEC $SHELL_OPTS make $MAKEJOBS -C depends HOST=$HOST $DEP_OPTS
 fi
 if [ -n "$PREVIOUS_RELEASES_TO_DOWNLOAD" ]; then
-  BEGIN_FOLD previous-versions
   DOCKER_EXEC test/get_previous_releases.py -b -t "$PREVIOUS_RELEASES_DIR" "${PREVIOUS_RELEASES_TO_DOWNLOAD}"
-  END_FOLD
 fi
diff --git a/ci/test/06_script_a.sh b/ci/test/06_script_a.sh
index d99068cb10..7986f7665a 100755
--- a/ci/test/06_script_a.sh
+++ b/ci/test/06_script_a.sh
@@ -12,30 +12,22 @@ if [ -z "$NO_WERROR" ]; then
 fi
 DOCKER_EXEC "ccache --zero-stats --max-size=$CCACHE_SIZE"
 
-BEGIN_FOLD autogen
 if [ -n "$CONFIG_SHELL" ]; then
   DOCKER_EXEC "$CONFIG_SHELL" -c "./autogen.sh"
 else
   DOCKER_EXEC ./autogen.sh
 fi
-END_FOLD
 
 DOCKER_EXEC mkdir -p "${BASE_BUILD_DIR}"
 export P_CI_DIR="${BASE_BUILD_DIR}"
 
-BEGIN_FOLD configure
 DOCKER_EXEC "${BASE_ROOT_DIR}/configure" --cache-file=config.cache $BITCOIN_CONFIG_ALL $BITCOIN_CONFIG || ( (DOCKER_EXEC cat config.log) && false)
-END_FOLD
 
-BEGIN_FOLD distdir
 DOCKER_EXEC make distdir VERSION=$HOST
-END_FOLD
 
 export P_CI_DIR="${BASE_BUILD_DIR}/bitcoin-$HOST"
 
-BEGIN_FOLD configure
 DOCKER_EXEC ./configure --cache-file=../config.cache $BITCOIN_CONFIG_ALL $BITCOIN_CONFIG || ( (DOCKER_EXEC cat config.log) && false)
-END_FOLD
 
 set -o errtrace
 trap 'DOCKER_EXEC "cat ${BASE_SCRATCH_DIR}/sanitizer-output/* 2> /dev/null"' ERR
@@ -48,12 +40,8 @@ if [[ ${USE_MEMORY_SANITIZER} == "true" ]]; then
   DOCKER_EXEC 'grep -v HAVE_SYS_GETRANDOM src/config/bitcoin-config.h > src/config/bitcoin-config.h.tmp && mv src/config/bitcoin-config.h.tmp src/config/bitcoin-config.h'
 fi
 
-BEGIN_FOLD build
 DOCKER_EXEC make $MAKEJOBS $GOAL || ( echo "Build failure. Verbose build follows." && DOCKER_EXEC make $GOAL V=1 ; false )
-END_FOLD
 
-BEGIN_FOLD cache_stats
 DOCKER_EXEC "ccache --version | head -n 1 && ccache --show-stats"
 DOCKER_EXEC du -sh "${DEPENDS_DIR}"/*/
 DOCKER_EXEC du -sh "${PREVIOUS_RELEASES_DIR}"
-END_FOLD
diff --git a/ci/test/06_script_b.sh b/ci/test/06_script_b.sh
index 7aea21f257..194b14beab 100755
--- a/ci/test/06_script_b.sh
+++ b/ci/test/06_script_b.sh
@@ -7,55 +7,39 @@
 export LC_ALL=C.UTF-8
 
 if [[ $HOST = *-mingw32 ]]; then
-  BEGIN_FOLD wrap-wine
   # Generate all binaries, so that they can be wrapped
   DOCKER_EXEC make $MAKEJOBS -C src/secp256k1 VERBOSE=1
   DOCKER_EXEC make $MAKEJOBS -C src/univalue VERBOSE=1
   DOCKER_EXEC "${BASE_ROOT_DIR}/ci/test/wrap-wine.sh"
-  END_FOLD
 fi
 
 if [ -n "$QEMU_USER_CMD" ]; then
-  BEGIN_FOLD wrap-qemu
   # Generate all binaries, so that they can be wrapped
   DOCKER_EXEC make $MAKEJOBS -C src/secp256k1 VERBOSE=1
   DOCKER_EXEC make $MAKEJOBS -C src/univalue VERBOSE=1
   DOCKER_EXEC "${BASE_ROOT_DIR}/ci/test/wrap-qemu.sh"
-  END_FOLD
 fi
 
 if [ -n "$USE_VALGRIND" ]; then
-  BEGIN_FOLD wrap-valgrind
   DOCKER_EXEC "${BASE_ROOT_DIR}/ci/test/wrap-valgrind.sh"
-  END_FOLD
 fi
 
 if [ "$RUN_UNIT_TESTS" = "true" ]; then
-  BEGIN_FOLD unit-tests
   DOCKER_EXEC ${TEST_RUNNER_ENV} DIR_UNIT_TEST_DATA=${DIR_UNIT_TEST_DATA} LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib make $MAKEJOBS check VERBOSE=1
-  END_FOLD
 fi
 
 if [ "$RUN_UNIT_TESTS_SEQUENTIAL" = "true" ]; then
-  BEGIN_FOLD unit-tests-seq
   DOCKER_EXEC ${TEST_RUNNER_ENV} DIR_UNIT_TEST_DATA=${DIR_UNIT_TEST_DATA} LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib "${BASE_BUILD_DIR}/bitcoin-*/src/test/test_bitcoin*" --catch_system_errors=no -l test_suite
-  END_FOLD
 fi
 
 if [ "$RUN_FUNCTIONAL_TESTS" = "true" ]; then
-  BEGIN_FOLD functional-tests
   DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib ${TEST_RUNNER_ENV} test/functional/test_runner.py --ci $MAKEJOBS --tmpdirprefix "${BASE_SCRATCH_DIR}/test_runner/" --ansi --combinedlogslen=4000 --timeout-factor=${TEST_RUNNER_TIMEOUT_FACTOR} ${TEST_RUNNER_EXTRA} --quiet --failfast
-  END_FOLD
 fi
 
 if [ "$RUN_SECURITY_TESTS" = "true" ]; then
-  BEGIN_FOLD security-tests
   DOCKER_EXEC make test-security-check
-  END_FOLD
 fi
 
 if [ "$RUN_FUZZ_TESTS" = "true" ]; then
-  BEGIN_FOLD fuzz-tests
   DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib test/fuzz/test_runner.py ${FUZZ_TESTS_CONFIG} $MAKEJOBS -l DEBUG ${DIR_FUZZ_IN}
-  END_FOLD
 fi
diff --git a/ci/test_run_all.sh b/ci/test_run_all.sh
index a1d4bd1952..304950a0b2 100755
--- a/ci/test_run_all.sh
+++ b/ci/test_run_all.sh
@@ -7,7 +7,6 @@
 export LC_ALL=C.UTF-8
 
 set -o errexit; source ./ci/test/00_setup_env.sh
-set -o errexit; source ./ci/test/03_before_install.sh
 set -o errexit; source ./ci/test/04_install.sh
 set -o errexit; source ./ci/test/05_before_script.sh
 set -o errexit; source ./ci/test/06_script_a.sh
diff --git a/doc/developer-notes.md b/doc/developer-notes.md
index 9cb416bb30..1f29bfffc4 100644
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -543,7 +543,7 @@ General Bitcoin Core
   - *Rationale*: RPC allows for better automatic testing. The test suite for
     the GUI is very limited.
 
-- Make sure pull requests pass Travis CI before merging.
+- Make sure pull requests pass CI before merging.
 
   - *Rationale*: Makes sure that they pass thorough testing, and that the tester will keep passing
      on the master branch. Otherwise, all new pull requests will start failing the tests, resulting in
@@ -1036,7 +1036,7 @@ Scripted diffs
 --------------
 
 For reformatting and refactoring commits where the changes can be easily automated using a bash script, we use
-scripted-diff commits. The bash script is included in the commit message and our Travis CI job checks that
+scripted-diff commits. The bash script is included in the commit message and our CI job checks that
 the result of the script is identical to the commit. This aids reviewers since they can verify that the script
 does exactly what it is supposed to do. It is also helpful for rebasing (since the same script can just be re-run
 on the new master commit).
diff --git a/doc/release-process.md b/doc/release-process.md
index cedb36d51d..92845bcc82 100644
--- a/doc/release-process.md
+++ b/doc/release-process.md
@@ -307,9 +307,9 @@ bitcoin.org (see below for bitcoin.org update instructions).
   - First, check to see if the Bitcoin.org maintainers have prepared a
     release: https://github.com/bitcoin-dot-org/bitcoin.org/labels/Core
 
-      - If they have, it will have previously failed their Travis CI
+      - If they have, it will have previously failed their CI
         checks because the final release files weren't uploaded.
-        Trigger a Travis CI rebuild---if it passes, merge.
+        Trigger a CI rebuild---if it passes, merge.
 
   - If they have not prepared a release, follow the Bitcoin.org release
     instructions: https://github.com/bitcoin-dot-org/bitcoin.org/blob/master/docs/adding-events-release-notes-and-alerts.md#release-notes
diff --git a/test/functional/README.md b/test/functional/README.md
index 2764acbf18..2d04413eb2 100644
--- a/test/functional/README.md
+++ b/test/functional/README.md
@@ -23,7 +23,7 @@ don't have test cases for.
 - The oldest supported Python version is specified in [doc/dependencies.md](/doc/dependencies.md).
   Consider using [pyenv](https://github.com/pyenv/pyenv), which checks [.python-version](/.python-version),
   to prevent accidentally introducing modern syntax from an unsupported Python version.
-  The Travis linter also checks this, but [possibly not in all cases](https://github.com/bitcoin/bitcoin/pull/14884#discussion_r239585126).
+  The CI linter job also checks this, but [possibly not in all cases](https://github.com/bitcoin/bitcoin/pull/14884#discussion_r239585126).
 - See [the python lint script](/test/lint/lint-python.sh) that checks for violations that
   could lead to bugs and issues in the test code.
 - Use [type hints](https://docs.python.org/3/library/typing.html) in your code to improve code readability