support skip ci in azure pipelines

.github/workflows/ci_packages.yml

@@ -1,6 +1,9 @@
 name: Packages CI
 on: [push, pull_request]
 
+
+
+
 jobs:
   build:
     if: |

azure-pipelines.yml

@@ -7,6 +7,11 @@ pr:
     include:
     - '*'
 
+variables:
+    SKIP_CI_FILTER: '[skip ci]'
+
+
+
 jobs:
 - job: packages
 
@@ -52,10 +57,27 @@ jobs:
   steps:
     - bash: git config --global core.autocrlf false
       displayName: 'Disable auto conversion to CRLF by git (Windows-only)'
-      condition: eq(variables['Agent.OS'], 'Windows_NT')
+      condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'))
 
     - checkout: self
-      fetchDepth: 1
+      fetchDepth: 2
+
+    - bash: |
+        # refs https://github.com/microsoft/azure-pipelines-agent/issues/2944
+        # --no-merges needed to avoid merge commits which occur for PR's.
+        # $(Build.SourceVersionMessage) isn't helpful
+        echo "ok1c"
+        git log -5 --pretty=format:"%s"
+        echo "ok2"
+        echo "\nok2b"
+        git log --no-merges -5 --pretty=format:"%s"
+        echo
+        echo "ok3"
+        commitMsg=$(git log --no-merges -1 --pretty=format:"%s")
+        echo commitMsg: $commitMsg
+        echo $commitMsg | grep -v '\[skip ci\]'
+      condition: and(succeeded(), eq(variables['Build.Reason'], 'PullRequest'))
+      displayName: 'Check whether to skip CI'
 
     - bash: git clone --depth 1 https://github.com/nim-lang/csources
       displayName: 'Checkout Nim csources'
@@ -73,7 +95,7 @@ jobs:
           echo_run sudo apt-fast install --no-install-recommends -yq \
             libcurl4-openssl-dev libgc-dev libsdl1.2-dev libsfml-dev valgrind libc6-dbg
       displayName: 'Install dependencies (amd64 Linux)'
-      condition: and(eq(variables['Agent.OS'], 'Linux'), eq(variables['CPU'], 'amd64'))
+      condition: and(succeeded(), eq(variables['Agent.OS'], 'Linux'), eq(variables['CPU'], 'amd64'))
 
     - bash: |
         set -e
@@ -113,11 +135,11 @@ jobs:
         echo_run chmod 755 bin/g++
 
       displayName: 'Install dependencies (i386 Linux)'
-      condition: and(eq(variables['Agent.OS'], 'Linux'), eq(variables['CPU'], 'i386'))
+      condition: and(succeeded(), eq(variables['Agent.OS'], 'Linux'), eq(variables['CPU'], 'i386'))
 
     - bash: brew install boehmgc make sfml
       displayName: 'Install dependencies (OSX)'
-      condition: eq(variables['Agent.OS'], 'Darwin')
+      condition: and(succeeded(), eq(variables['Agent.OS'], 'Darwin'))
 
     - bash: |
         set -e
@@ -130,7 +152,7 @@ jobs:
         echo_run echo '##vso[task.prependpath]$(System.DefaultWorkingDirectory)/dist/mingw64/bin'
 
       displayName: 'Install dependencies (Windows)'
-      condition: eq(variables['Agent.OS'], 'Windows_NT')
+      condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'))
 
     - bash: echo '##vso[task.prependpath]$(System.DefaultWorkingDirectory)/bin'
       displayName: 'Add build binaries to PATH'

doc/contributing.rst

@@ -461,9 +461,10 @@ Continuous Integration (CI)
 
 1. Continuous Integration is by default run on every push in a PR; this clogs
    the CI pipeline and affects other PR's; if you don't need it (e.g. for WIP or
-   documentation only changes), add `[ci skip]` to your commit message title.
-   This convention is supported by `Appveyor
-   <https://www.appveyor.com/docs/how-to/filtering-commits/#skip-directive-in-commit-message>`_
+   documentation only changes), add `[skip ci]` to your commit message title.
+   This convention is supported by our github actions pipelines, as well as other piplines
+   (now unused in this repository):
+   `Appveyor <https://www.appveyor.com/docs/how-to/filtering-commits/#skip-directive-in-commit-message>`_
    and `Travis <https://docs.travis-ci.com/user/customizing-the-build/#skipping-a-build>`_.
 
 2. Consider enabling CI (azure, GitHub actions and builds.sr.ht) in your own Nim fork, and