ci: Skip .base-build job if no source code or configurations are changed

utils/tests/gitlab-ci-alpine.yml

@@ -21,7 +21,7 @@
       bash
       iproute2 linux-headers
       openmpi openmpi-dev
-      openssh
+      openssh git
   variables:
     COMPILER: g++
 

utils/tests/gitlab-ci-clang.yml

@@ -24,7 +24,7 @@
       libgsl-dev $LIBGSL gsl-bin
       libsqlite3-dev sqlite3
       libxml2 libxml2-dev
-      ssh
+      ssh git
   variables:
     COMPILER: clang++-$CLANG
 

utils/tests/gitlab-ci-fedora.yml

@@ -28,6 +28,7 @@
       python python-devel
       pygobject3-devel python3-gobject gobject-introspection-devel
       graphviz-devel graphviz ipython
+      git
     - source /etc/profile.d/modules.sh
     - module load mpi/openmpi-x86_64
   variables:

utils/tests/gitlab-ci-gcc.yml

@@ -36,7 +36,7 @@
       libsqlite3-dev sqlite3
       libeigen3-dev
       qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools
-      ssh
+      ssh git
 
 weekly-gcc:
   rules:

utils/tests/gitlab-ci-per-commit.yml

@@ -15,7 +15,7 @@
       base-devel gcc clang libc++ cmake ninja ccache
       python
       boost gsl gtk3 openmpi
-      openssh
+      openssh git
 
 # Build stage
 per-commit-clang-optimized-libc++:

utils/tests/gitlab-ci-scheduled.yml

@@ -16,7 +16,7 @@
       python
       boost gsl gtk3 openmpi
       glibc-debug
-      openssh
+      openssh git
   script:
     - mkdir -p $CCACHE_BASEDIR_VALUE
     - export CCACHE_BASEDIR=${PWD}

utils/tests/gitlab-ci-ubuntu.yml

@@ -28,7 +28,7 @@
       libsqlite3-dev sqlite3
       libeigen3-dev
       qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools
-      ssh
+      ssh git
 
 weekly-ubuntu:
   rules:

utils/tests/gitlab-ci.yml

@@ -45,6 +45,22 @@ workflow:
 # MODE (debug, default, optimized)
 .base-build:
   script:
+    - if (git remote | grep -qw upstream) ; then
+      git remote remove upstream ;
+      fi
+    - git remote add -t $CI_DEFAULT_BRANCH --no-tags -f upstream https://gitlab.com/nsnam/ns-3-dev.git
+    - git diff --name-only upstream/$CI_DEFAULT_BRANCH > $FILES_CHANGED
+
+    # Run this job in the following cases: 1) default branch, 2) changes to source code, 3) changes to configurations.
+    # Skip this job in the opposite cases.
+    # File paths generated by git diff are relative to the working tree.
+    - |
+      if [[ $CI_COMMIT_BRANCH != $CI_DEFAULT_BRANCH ]] &&
+         !(grep -qE ".*\.(cc|h)|CMakeLists.txt|build-support/|ns3|utils/tests/.*\.(yaml|yml)" $FILES_CHANGED) ; then
+        echo "No source code or configurations changes found in this MR. Skipping this job.";
+        exit 0;
+      fi
+
     - mkdir -p $CCACHE_BASEDIR_VALUE
     - export CCACHE_BASEDIR=${PWD}
     - export CCACHE_DIR=${PWD}/$CCACHE_BASEDIR_VALUE
@@ -82,11 +98,13 @@ workflow:
   timeout: 12h
   variables:
     CCACHE_BASEDIR_VALUE: ns-3-ccache-storage
+    FILES_CHANGED: git-diff-name-only.txt
   artifacts:
     expire_in: 2 day
     paths:
       - build/
       - .lock-*
+      - $FILES_CHANGED
 
 # Weekly jobs for other distribution and compilers
 include: