Merge #20658: ci: Move linter task to cirrus

4045a6722c884be779e86016313061ac6ff80808 ci: Use cpu=1 for linter (Dhruv Mehta)
739d39022d2959c1114c14a0065daebf4fe812c1 ci: Move linter task to cirrus (Dhruv Mehta)

Pull request description:

  Solves #20467: Move linter to Cirrus-CI as Travis-CI.org is shutting down

ACKs for top commit:
  MarcoFalke:
    ACK 4045a6722c884be779e86016313061ac6ff80808

Tree-SHA512: 9aa7487ac86c91fc68bb584d29134e304dbd46702514a5d47d1ef0de6b877d96d42b7589870fc67ad9a31f5d3a789728446da4418688f336111a9ba0f8de5feb

3 files changed, 14 insertions, 14 deletions

diff --git a/ci/lint/04_install.sh b/ci/lint/04_install.sh
index fae424051d..43d33b3f3b 100755
--- a/ci/lint/04_install.sh
+++ b/ci/lint/04_install.sh
@@ -6,14 +6,14 @@
 
 export LC_ALL=C
 
-travis_retry sudo apt update && sudo apt install -y clang-format-9
-sudo update-alternatives --install /usr/bin/clang-format      clang-format      $(which clang-format-9     ) 100
-sudo update-alternatives --install /usr/bin/clang-format-diff clang-format-diff $(which clang-format-diff-9) 100
+${CI_RETRY_EXE} apt update && apt install -y clang-format-9 python3-pip curl git
+update-alternatives --install /usr/bin/clang-format      clang-format      $(which clang-format-9     ) 100
+update-alternatives --install /usr/bin/clang-format-diff clang-format-diff $(which clang-format-diff-9) 100
 
-travis_retry pip3 install codespell==1.17.1
-travis_retry pip3 install flake8==3.8.3
-travis_retry pip3 install yq
-travis_retry pip3 install mypy==0.781
+${CI_RETRY_EXE} pip3 install codespell==1.17.1
+${CI_RETRY_EXE} pip3 install flake8==3.8.3
+${CI_RETRY_EXE} pip3 install yq
+${CI_RETRY_EXE} pip3 install mypy==0.781
 
 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/
diff --git a/ci/lint/05_before_script.sh b/ci/lint/05_before_script.sh
index 2987812c8e..8e5a177b01 100755
--- a/ci/lint/05_before_script.sh
+++ b/ci/lint/05_before_script.sh
@@ -6,4 +6,4 @@
 
 export LC_ALL=C
 
-git fetch --unshallow
+git fetch
diff --git a/ci/lint/06_script.sh b/ci/lint/06_script.sh
index 6f81ecb22e..ba582e7bf6 100755
--- a/ci/lint/06_script.sh
+++ b/ci/lint/06_script.sh
@@ -6,11 +6,11 @@
 
 export LC_ALL=C
 
-if [ "$TRAVIS_EVENT_TYPE" = "pull_request" ]; then
-  # TRAVIS_BRANCH will be present in a Travis environment. For builds triggered
+if [ -n "$CIRRUS_PR" ]; then
+  # CIRRUS_PR will be present in a Cirrus environment. For builds triggered
   # by a pull request this is the name of the branch targeted by the pull request.
-  # https://docs.travis-ci.com/user/environment-variables/
-  COMMIT_RANGE="$TRAVIS_BRANCH..HEAD"
+  # https://cirrus-ci.org/guide/writing-tasks/#environment-variables
+  COMMIT_RANGE="$CIRRUS_BRANCH..HEAD"
   test/lint/commit-script-check.sh $COMMIT_RANGE
 fi
 
@@ -25,8 +25,8 @@ test/lint/check-doc.py
 test/lint/check-rpc-mappings.py .
 test/lint/lint-all.sh
 
-if [ "$TRAVIS_REPO_SLUG" = "bitcoin/bitcoin" ] && [ "$TRAVIS_EVENT_TYPE" = "cron" ]; then
+if [ "$CIRRUS_REPO_FULL_NAME" = "bitcoin/bitcoin" ] && [ -n "$CIRRUS_CRON" ]; then
     git log --merges --before="2 days ago" -1 --format='%H' > ./contrib/verify-commits/trusted-sha512-root-commit
-    travis_retry gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys $(<contrib/verify-commits/trusted-keys) &&
+    ${CI_RETRY_EXE}  gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys $(<contrib/verify-commits/trusted-keys) &&
     ./contrib/verify-commits/verify-commits.py --clean-merge=2;
 fi