From 2145909d9f80043bb1a986b3ac2e1715fa44e4e3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=20Gl=C3=A4=C3=9F-St=C3=B6cker?= <micha@stoecker.me>
Date: Fri, 6 Aug 2021 17:43:26 +0200
Subject: [PATCH] correct the docker image tagging and only build if there is a
 newer version available

---
 .gitlab-ci.yml | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index cb9477f..3db72eb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -12,14 +12,22 @@ build:
   stage: build
   variables:
     IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
-    D_IMAGE_TAG: egon0/writefreely-multiarch:$CI_COMMIT_REF_SLUG
+    D_IMAGE_TAG: egon0/writefreely-multiarch
     D_LATEST_TAG: egon0/writefreely-multiarch:latest
   script:
-    - apk add --no-cache jq wget
-    - VERSION=$(wget --quiet "https://api.github.com/repos/writefreely/writefreely/releases/latest" -O - |  jq -r '.tag_name') && wget https://github.com/writefreely/writefreely/archive/${VERSION}.tar.gz -O /tmp/writefreely.tar.gz
-    - tar xf /tmp/writefreely.tar.gz --strip-components=1
-    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
-    - docker login -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
-    - sed -i 's/nodejs-npm/npm/g' Dockerfile
-    - docker buildx create --use --name A$CI_COMMIT_SHORT_SHA
-    - docker buildx build --platform $BUILD_PLATFORMS --push -t $IMAGE_TAG -t $CI_REGISTRY_IMAGE:latest -t $D_IMAGE_TAG -t $D_LATEST_TAG .
+      - >
+        apk add --no-cache jq wget;
+        LATEST_GITHUB=$(wget --quiet "https://api.github.com/repos/writefreely/writefreely/releases/latest" -O - |  jq -r '.tag_name');
+        LATEST_DHUB=$(wget -q https://registry.hub.docker.com/v1/repositories/$D_IMAGE_TAG/tags -O - | sed -e 's/[][]//g' -e 's/"//g' -e 's/ //g' | tr '}' '\n' | awk -F: '{print $3}' | tail -n1);
+        if [ "$LATEST_GITHUB" != "$LATEST_DHUB" ]
+         then
+          wget https://github.com/writefreely/writefreely/archive/${VERSION}.tar.gz -O /tmp/writefreely.tar.gz
+          tar xf /tmp/writefreely.tar.gz --strip-components=1
+          sed -i 's/nodejs-npm/npm/g' Dockerfile
+          docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+          docker login -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
+          docker buildx create --use --name A$CI_COMMIT_SHORT_SHA
+          docker buildx build --platform $BUILD_PLATFORMS --push -t $IMAGE_TAG:$LATEST_GITHUB -t $CI_REGISTRY_IMAGE:latest -t $D_IMAGE_TAG:$LATEST_GITHUB -t $D_LATEST_TAG .
+        else
+          return 0
+        fi