From 4c6ea303b2458d21f4a1f676199263ff2f28885d Mon Sep 17 00:00:00 2001
From: Vasilis Tsiligiannis <acinonyx@openwrt.gr>
Date: Mon, 11 Feb 2019 18:36:21 +0200
Subject: [PATCH] Utilize Docker cache to speed up building

Signed-off-by: Vasilis Tsiligiannis <acinonyx@openwrt.gr>
---
 .gitlab-ci.yml           |  4 +++-
 docker-compose.cache.yml | 12 ++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 docker-compose.cache.yml

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a63282f..71f6701 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -56,7 +56,9 @@ docker:
     - apk --update add py-pip
     - pip install docker-compose
   script:
-    - docker-compose build --no-cache --pull
+    - CACHE_IMAGE="${CI_REGISTRY_IMAGE:+$CI_REGISTRY_IMAGE/satnogs-db:$CI_COMMIT_REF_NAME}"; export CACHE_IMAGE
+    - docker-compose -f docker-compose.yml -f docker-compose.cache.yml pull cache_image || true
+    - docker-compose -f docker-compose.yml -f docker-compose.cache.yml build --pull
     - |
       [ -z "$CI_REGISTRY_IMAGE" ] || {
           docker login -u $CI_REGISTRY_USER -p $CI_JOB_TOKEN $CI_REGISTRY
diff --git a/docker-compose.cache.yml b/docker-compose.cache.yml
new file mode 100644
index 0000000..e8ce348
--- /dev/null
+++ b/docker-compose.cache.yml
@@ -0,0 +1,12 @@
+version: '3.2'
+services:
+  cache_image:
+    image: '$CACHE_IMAGE'
+  web:
+    build:
+      cache_from:
+        - '$CACHE_IMAGE'
+  celery:
+    build:
+      cache_from:
+        - '$CACHE_IMAGE'