Run drone only if source file changed

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

.drone.yml

@@ -3,8 +3,9 @@ name: generic
 
 steps:
   - name: generic
-    image: nextcloudci/android:android-48
+    image: nextcloudci/android:android-49
     commands:
+      - scripts/checkIfRunDrone.sh || exit 0
       - ./gradlew assembleGeneric
 
   - name: notify
@@ -42,7 +43,7 @@ name: gplay
 
 steps:
   - name: gplay
-    image: nextcloudci/android:android-48
+    image: nextcloudci/android:android-49
     privileged: true
     environment:
       LOG_USERNAME:
@@ -55,6 +56,7 @@ steps:
         from_secret: GIT_TOKEN
       ORG_GRADLE_PROJECT_coverage: ''
     commands:
+      - scripts/checkIfRunDrone.sh || exit 0
       - ./gradlew assembleGplay
       - emulator -avd android-27 -no-window -no-audio &
       - ./wait_for_emulator.sh
@@ -103,7 +105,7 @@ name: analysis
 
 steps:
   - name: analysis
-    image: nextcloudci/android:android-48
+    image: nextcloudci/android:android-49
     environment:
       GIT_USERNAME:
         from_secret: GIT_USERNAME
@@ -114,6 +116,7 @@ steps:
       LOG_PASSWORD:
         from_secret: LOG_PASSWORD
     commands:
+      - scripts/checkIfRunDrone.sh || exit 0
       - export BRANCH=$(scripts/analysis/getBranchName.sh $GIT_USERNAME $GIT_TOKEN $DRONE_PULL_REQUEST)
       - scripts/analysis/analysis-wrapper.sh $GIT_USERNAME $GIT_TOKEN $BRANCH $LOG_USERNAME $LOG_PASSWORD $DRONE_BUILD_NUMBER $DRONE_PULL_REQUEST
 
@@ -151,7 +154,7 @@ name: qa
 
 steps:
   - name: qa
-    image: nextcloudci/android:android-48
+    image: nextcloudci/android:android-49
     privileged: true
     environment:
       LOG_USERNAME:
@@ -167,6 +170,7 @@ steps:
       KEY_PASS:
         from_secret: KEY_PASS
     commands:
+      - scripts/checkIfRunDrone.sh || exit 0
       - sed -i "/qa/,/\}/ s/versionCode .*/versionCode $DRONE_BUILD_NUMBER/" build.gradle
       - sed -i "/qa/,/\}/ s/versionName .*/versionName \"$DRONE_BUILD_NUMBER\"/" build.gradle
       - ./gradlew assembleQaDebug

scripts/checkIfRunDrone.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+export BRANCH=$(scripts/analysis/getBranchName.sh $GIT_USERNAME $GIT_TOKEN $DRONE_PULL_REQUEST)
+[ $(git diff --name-only origin/$BRANCH | grep -c "^src") -eq 0 ] && echo "No source files changed" && exit 1