trigger-lt-qcom-openembedded-images: implement local git polling trigger

There's still issue with detecting git remote changes with multiple SCM.
As discussed in the past, one way to resolve this issue is to do the logic
in the trigger job directly.

Change-Id: I3e0bf5545421a76a5f6c124673a3e72e6478d87c
Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>

1 files changed, 38 insertions, 78 deletions

diff --git a/trigger-lt-qcom-openembedded-images.yaml b/trigger-lt-qcom-openembedded-images.yaml
index 58c7f61c38..ba23ce3abb 100644
--- a/trigger-lt-qcom-openembedded-images.yaml
+++ b/trigger-lt-qcom-openembedded-images.yaml
@@ -1,87 +1,25 @@
-- scm:
-    name: oe-core
-    scm:
-        - git:
-            url: https://github.com/openembedded/openembedded-core
-            refspec: +refs/heads/*:refs/remotes/oe-core/*
-            name: oe-core
-            branches:
-                - remotes/oe-core/morty
-            skip-tag: true
-            shallow-clone: true
-            wipe-workspace: false
-- scm:
-    name: meta-oe
-    scm:
-        - git:
-            url: https://github.com/openembedded/meta-openembedded
-            refspec: +refs/heads/*:refs/remotes/meta-oe/*
-            name: meta-oe
-            branches:
-                - remotes/meta-oe/morty
-            skip-tag: true
-            shallow-clone: true
-            wipe-workspace: false
-- scm:
-    name: meta-qcom
-    scm:
-        - git:
-            url: https://github.com/ndechesne/meta-qcom
-            refspec: +refs/heads/*:refs/remotes/meta-qcom/*
-            name: meta-qcom
-            branches:
-                - remotes/meta-qcom/morty
-            skip-tag: true
-            shallow-clone: true
-            wipe-workspace: false
-- scm:
-    name: meta-rpb
-    scm:
-        - git:
-            url: https://github.com/96boards/meta-rpb
-            refspec: +refs/heads/*:refs/remotes/meta-rpb/*
-            name: meta-rpb
-            branches:
-                - remotes/meta-rpb/morty
-            skip-tag: true
-            shallow-clone: true
-            wipe-workspace: false
-- scm:
-    name: meta-backports
-    scm:
-        - git:
-            url: https://git.linaro.org/openembedded/meta-backports
-            refspec: +refs/heads/*:refs/remotes/meta-backports/*
-            name: meta-backports
-            branches:
-                - remotes/meta-backports/morty
-            skip-tag: true
-            shallow-clone: true
-            wipe-workspace: false
 - job:
     name: trigger-lt-qcom-openembedded-images
     project-type: freestyle
     defaults: global
-    logrotate:
-        daysToKeep: 30
-        numToKeep: 30
     properties:
         - authorization:
             anonymous:
                 - job-read
                 - job-extended-read
-                - job-workspace
+        - build-discarder:
+            days-to-keep: 1
+            num-to-keep: 30
+            artifact-num-to-keep: 30
+    parameters:
+        - string:
+            name: FORCE_TRIGGER
+            default: ''
     disabled: false
     node: master
     display-name: 'Trigger for Qualcomm OE builds'
-    scm:
-        - oe-core
-        - meta-oe
-        - meta-qcom
-        - meta-rpb
-        - meta-backports
     triggers:
-        - pollscm: 'H/5 * * * *'
+        - timed: 'H/5 * * * *'
     wrappers:
         - timestamps
     builders:
@@ -90,10 +28,32 @@
 
             set -e
 
-            printf "${GIT_URL} ${GIT_BRANCH} ${GIT_COMMIT}\n"
-            printf "${GIT_URL_1} ${GIT_BRANCH_1} ${GIT_COMMIT_1}\n"
-            printf "${GIT_URL_2} ${GIT_BRANCH_2} ${GIT_COMMIT_2}\n"
-            printf "${GIT_URL_3} ${GIT_BRANCH_3} ${GIT_COMMIT_3}\n"
-            printf "${GIT_URL_4} ${GIT_BRANCH_4} ${GIT_COMMIT_4}\n"
-        - trigger-builds:
-            - project: 'lt-qcom-openembedded-rpb-morty'
+            GIT_BRANCH="refs/heads/morty"
+            git ls-remote --heads https://github.com/openembedded/openembedded-core ${GIT_BRANCH} > git-polling.txt
+            git ls-remote --heads https://github.com/openembedded/meta-openembedded ${GIT_BRANCH} >> git-polling.txt
+            git ls-remote --heads https://github.com/ndechesne/meta-qcom  ${GIT_BRANCH} >> git-polling.txt
+            git ls-remote --heads https://github.com/96boards/meta-rpb ${GIT_BRANCH} >> git-polling.txt
+            git ls-remote --heads https://git.linaro.org/openembedded/meta-backports ${GIT_BRANCH} >> git-polling.txt
+
+            rm -f git-changes-detected
+            # Check the file existence
+            if wget -q --spider "${JOB_URL}lastSuccessfulBuild/artifact/git-polling.txt"; then
+              # Download the file
+              wget -q "${JOB_URL}lastSuccessfulBuild/artifact/git-polling.txt" -O git-polling-latest.txt
+              # Compare latest git polling with current
+              cmp -s git-polling-latest.txt git-polling.txt || touch git-changes-detected
+            else
+              echo "Remote file does not exist. Skip comparison and trigger."
+            fi
+
+            # Allow to force manually the build
+            [ -z "${FORCE_TRIGGER}" ] || touch git-changes-detected
+        - conditional-step:
+            condition-kind: file-exists
+            condition-filename: git-changes-detected
+            steps:
+                - trigger-builds:
+                    - project: 'lt-qcom-openembedded-rpb-morty'
+    publishers:
+        - archive:
+            artifacts: 'git-polling.txt'