From 9621afd8f2ffc64766e945762b900596a2a2deef Mon Sep 17 00:00:00 2001
From: Eduardo Almeida <enmsa@outlook.pt>
Date: Mon, 19 Feb 2024 17:49:45 +0000
Subject: [PATCH] ci: Skip .base-build job if no source code or configurations
 are changed

---
 utils/tests/gitlab-ci-alpine.yml     |  2 +-
 utils/tests/gitlab-ci-clang.yml      |  2 +-
 utils/tests/gitlab-ci-fedora.yml     |  1 +
 utils/tests/gitlab-ci-gcc.yml        |  2 +-
 utils/tests/gitlab-ci-per-commit.yml |  2 +-
 utils/tests/gitlab-ci-scheduled.yml  |  2 +-
 utils/tests/gitlab-ci-ubuntu.yml     |  2 +-
 utils/tests/gitlab-ci.yml            | 18 ++++++++++++++++++
 8 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/utils/tests/gitlab-ci-alpine.yml b/utils/tests/gitlab-ci-alpine.yml
index e14352423..f2426476b 100644
--- a/utils/tests/gitlab-ci-alpine.yml
+++ b/utils/tests/gitlab-ci-alpine.yml
@@ -21,7 +21,7 @@
       bash
       iproute2 linux-headers
       openmpi openmpi-dev
-      openssh
+      openssh git
   variables:
     COMPILER: g++
 
diff --git a/utils/tests/gitlab-ci-clang.yml b/utils/tests/gitlab-ci-clang.yml
index 403102685..e66ea374e 100644
--- a/utils/tests/gitlab-ci-clang.yml
+++ b/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
 
diff --git a/utils/tests/gitlab-ci-fedora.yml b/utils/tests/gitlab-ci-fedora.yml
index 7627654fa..90dd261de 100644
--- a/utils/tests/gitlab-ci-fedora.yml
+++ b/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:
diff --git a/utils/tests/gitlab-ci-gcc.yml b/utils/tests/gitlab-ci-gcc.yml
index 64318ca8f..e0d29a94c 100644
--- a/utils/tests/gitlab-ci-gcc.yml
+++ b/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:
diff --git a/utils/tests/gitlab-ci-per-commit.yml b/utils/tests/gitlab-ci-per-commit.yml
index e5f0b4a55..fca441bd4 100644
--- a/utils/tests/gitlab-ci-per-commit.yml
+++ b/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++:
diff --git a/utils/tests/gitlab-ci-scheduled.yml b/utils/tests/gitlab-ci-scheduled.yml
index fc4c076cc..b3fef4ee3 100644
--- a/utils/tests/gitlab-ci-scheduled.yml
+++ b/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}
diff --git a/utils/tests/gitlab-ci-ubuntu.yml b/utils/tests/gitlab-ci-ubuntu.yml
index 72bd1c2e0..ff8825f70 100644
--- a/utils/tests/gitlab-ci-ubuntu.yml
+++ b/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:
diff --git a/utils/tests/gitlab-ci.yml b/utils/tests/gitlab-ci.yml
index b657e242d..9171df0b3 100644
--- a/utils/tests/gitlab-ci.yml
+++ b/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: