Merge branch 'trunk' into compiler_warningscompiler_warnings

2 files changed, 53 insertions, 4 deletions

diff --git a/.circleci/config.yml b/.circleci/config.yml
index bb542a94d..986ffa2c2 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -14,10 +14,17 @@ jobs:
       - run:
           name: Run CheckStyle Test
           command: ./gradlew checkstyleMain
+      - store_artifacts:
+          name: Store checkstyle report
+          path: navit/android/checkstyle
+          destination: reports
   build_linux:
     <<: *defaults
     steps:
       - checkout
+      - run: |
+          apt-get update && apt-get install -y git
+          if scripts/check_need_build.sh; then circleci step halt; fi
       - run:
           name: Id
           command: cat /etc/*release
@@ -39,6 +46,7 @@ jobs:
     <<: *defaults
     steps:
       - checkout
+      - run: if scripts/check_need_build.sh; then circleci step halt; fi
       - run:
           name: Install doxygen and other essentials
           command: apt-get update && apt-get -y install doxygen ca-certificates git rsync
@@ -54,6 +62,7 @@ jobs:
     machine: true
     steps:
       - checkout
+      - run: if scripts/check_need_build.sh; then circleci step halt; fi
       - run:
           name: install docker
           command: circleci-install docker
@@ -75,6 +84,7 @@ jobs:
       GRADLE_OPTS: '-Dorg.gradle.jvmargs="-Xmx2048m -XX:+HeapDumpOnOutOfMemoryError"'
     steps:
       - checkout
+      - run: if scripts/check_need_build.sh; then circleci step halt; fi
       - run:
           name: Id
           command: cat /etc/*release
@@ -116,10 +126,6 @@ jobs:
           name: Store Lint reports
           path: navit/android/build/reports
           destination: reports
-      - store_artifacts:
-          name: Store checkstyle report
-          path: /home/circleci/code/navit/android/checkstyle
-          destination: reports
       - store_test_results:
           path: test-results
       - run:
@@ -131,6 +137,9 @@ jobs:
       - image: ubuntu:14.04
     steps:
       - checkout
+      - run: |
+          apt-get update && apt-get install -y git
+          if scripts/check_need_build.sh; then circleci step halt; fi
       - run:
           name: Prepare the Windows build environment
           command: |
@@ -154,6 +163,9 @@ jobs:
       - image: navit/dockerfiles:wince
     steps:
       - checkout
+      - run: |
+          apt-get update && apt-get install -y git-core
+          if scripts/check_need_build.sh; then circleci step halt; fi
       - run:
           name: Prepare the WinCE build environment
           command: |
@@ -173,6 +185,7 @@ jobs:
       - image: navit/tomtom-ng
     steps:
       - checkout
+      - run: if scripts/check_need_build.sh; then circleci step halt; fi
       - run:
           name: Setup common requirements
           command: |
@@ -193,6 +206,7 @@ jobs:
       - image: navit/tomtom-ng
     steps:
       - checkout
+      - run: if scripts/check_need_build.sh; then circleci step halt; fi
       - run:
           name: Setup common requirements
           command: |
diff --git a/scripts/check_need_build.sh b/scripts/check_need_build.sh
new file mode 100755
index 000000000..124722e9a
--- /dev/null
+++ b/scripts/check_need_build.sh
@@ -0,0 +1,35 @@
+#!/bin/bash -e
+# ################################################################################################################### #
+# This file exits 1 if there are files of interest that should trigger a build and exits normally otherwise.          #
+# The idea is also to build if the exit code is different from 0 as it means we cannot get a filtered list properly.  #
+# ################################################################################################################### #
+
+# If we are on a tag, just exit 1 as we want to go on with the build
+git describe --exact-match --tags HEAD 2>&1 2>/dev/null && exit 1 || echo "Not on a tag, checking files diff"
+
+# This block constructs the list of files that differ from the trunk branch.
+# Note that if you are on the trunk or master branch it will return the files modified by the last commit.
+declare -a file_list=$(git diff --name-only refs/remotes/origin/trunk)
+# If there is no diff that might just mean that you are on the trunk or master branch
+# so you just want to check the last commit. This way we still have that check more
+# or less working when pushing directly to trunk or when merging in master.
+if [[ -z "$file_list" ]]; then
+    file_list=$(git diff --name-only HEAD^)
+fi
+
+# This block filters out those don't match the pattern we use to exclude files that should not trigger a build.
+declare -a filters=('^docs/.*' '.*\.md$' '.*\.rst$')
+for f in ${file_list[@]}; do
+    for filter in "${filters[@]}" ; do
+        echo "checking $f with filter $filter"
+        if [[ "$f" =~ $filter ]]; then
+            # This removes the element from the element matching the filter
+            file_list=(${file_list[@]/$f})
+            echo "filtering out $f"
+            break
+        fi
+    done
+done
+
+# exits with a 0 if the list is empty
+[[ -z "${file_list}" ]]