Check upstream image every 6h.

Dockerfile

@@ -1,6 +1,6 @@
-FROM nginx:alpine
+FROM nginx:alpine-perl
 
-RUN apk add --upgrade --no-cache gettext inotify-tools
+RUN apk add --upgrade --no-cache bash gettext inotify-tools
 RUN mv /etc/nginx /etc/nginx.tmpl
 RUN touch /etc/envsubst.conf
 

ci/pipeline.yml

@@ -5,10 +5,27 @@ resources:
   source:
     uri: https://gitea.redxef.at/redxef/nginx-envsubst
     branch: master
+    fetch_tags: true
 - name: upstream-image
   type: registry-image
+  check_every: 6h
   source:
-    repository: alpine
+    repository: nginx
+    tag: alpine
+- name: image
+  type: oci-image
+  source:
+    repository: redxef/nginx-envsubst
+    tag: latest
+    username: ((docker.username))
+    password: ((docker.password))
+
+resource_types:
+- name: oci-image
+  type: registry-image
+  source:
+    repository: redxef/concourse-oci-resource
+    tag: latest
 
 jobs:
 - name: build-push
@@ -51,16 +68,18 @@ jobs:
       - name: source
         path: .
       - name: docker-tags
+      outputs:
+      - name: build-output
       params:
-        username: ((docker.username))
+        dest: build-output/image.tar
-        password: ((docker.password))
-        repository: docker.io/redxef/nginx-envsubst
-        tag: latest
-        additional_tags: docker-tags/tags.txt
-        push: true
         platform: aarch64,arm,i386,ppc64le,s390x,x86_64
-        context: .
-        manual: false
       run:
         path: build
+  - put: image
+    inputs:
+    - build-output
+    - docker-tags
+    params:
+      image: build-output/image.tar
+      additional_tags: docker-tags/tags.txt
 

start-nginx.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
 pids=""
 
@@ -36,10 +36,16 @@ run_nginx() {
 }
 
 run_inotifywait() {
-    while find "$dstdir" -type f -exec \
+    while :; do
-        sed -En '/ssl_certificate/ s/^\s*ssl_certificate(_key)? (.*);.*$/\2/p' {} \; | sort | uniq | \
+        wait_files="$(find "$dstdir" -type f -exec \
-        inotifywait --fromfile=-; do
+            sed -En '/ssl_certificate/ s/^\s*ssl_certificate(_key)? (.*);.*$/\2/p' {} \; | sort -u)"
+        wait_directories="$(echo "$wait_files" | xargs -n 1 dirname | sort -u)"
+        echo "monitoring the following files:"
+        echo "$wait_files"
+        matched_files="$(echo "$wait_directories" | inotifywait --fromfile=- -e close_write -e modify -e create)"
+        if [[ -n "$(comm -12 <(sort -u <<< "$matched_files") <(echo "$wait_files"))" ]]; then
             nginx -s reload
+        fi
     done
 }