roles/blog: fix updateBlog

roles/blog/tasks/main.yml

@@ -4,18 +4,18 @@
     repo: "https://github.com/CPunch/openpunk.git"
     dest: "/var/www/{{ domain }}"
 
-# TODO: make idempotent (call the updateBlog script !!)
-- name: Build blog
-  command:
-    cmd: hugo
-    chdir: "/var/www/{{ domain }}"
-
 - name: Install updateBlog script
   template:
     src: templates/updateBlog
     dest: /usr/local/bin/updateBlog
     mode: u+rx
 
+- name: Build blog
+  command:
+    cmd: updateBlog
+  register: blog_out
+  changed_when: blog_out.stdout != "up to date"
+
 # Rebuild blog every hour
 - name: Setup blog cron job
   cron:

roles/blog/templates/updateBlog

@@ -1,8 +1,32 @@
 #!/bin/bash
 cd /var/www/{{ domain }}
-/usr/bin/git fetch origin
-/usr/bin/git reset --hard origin/main
 
-# build sites
-/usr/bin/hugo --cleanDestinationDir --minify -d public -b https://{{ domain }}
-/usr/bin/hugo --cleanDestinationDir --minify -d tor -b {{ onionDomain }}
+PUBLIC_DIR=public
+TOR_DIR=tor
+
+buildBlog () {
+    hugo --cleanDestinationDir --minify -d $PUBLIC_DIR -b https://{{ domain }}
+    hugo --cleanDestinationDir --minify -d $TOR_DIR -b {{ onionDomain }}
+}
+
+git fetch origin
+UPSTREAM=${1:-'@{u}'}
+LOCAL=$(git rev-parse @)
+REMOTE=$(git rev-parse "$UPSTREAM")
+BASE=$(git merge-base @ "$UPSTREAM")
+if [ $LOCAL = $REMOTE ]; then
+    # this string is hardcoded && checked by the 'Build blog' task
+    # to check for changes (changed_when)
+    echo "up to date"
+elif [ $LOCAL = $BASE ]; then
+    # there are changes to reset too so we need to rebuild
+    echo "missing changes !!"
+    git reset --hard origin/main
+    buildBlog
+fi
+
+if [ ! -d "$PUBLIC_DIR" ] || [ ! -d "$TOR_DIR" ]; then
+    # probably first time setup
+    echo "missing directories !!"
+    buildBlog
+fi