git: add zola runner to automatically build & depoly the blog

2 files changed, 47 insertions, 0 deletions

diff --git a/roles/git/files/runner-zola/Dockerfile b/roles/git/files/runner-zola/Dockerfile
new file mode 100644
index 0000000..be1eb6e
--- /dev/null
+++ b/roles/git/files/runner-zola/Dockerfile
@@ -0,0 +1,11 @@
+FROM alpine:latest
+
+RUN apk add --update-cache --upgrade --no-cache --purge \
+      zola git                                          \
+    && rm -rf /var/cache/apk
+
+EXPOSE 80
+WORKDIR /tmp
+
+COPY webhook.sh /
+ENTRYPOINT ["/webhook.sh"]
diff --git a/roles/git/files/runner-zola/webhook.sh b/roles/git/files/runner-zola/webhook.sh
new file mode 100755
index 0000000..6f20c8c
--- /dev/null
+++ b/roles/git/files/runner-zola/webhook.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# Simple webhook to build and deploy latest blog version.
+# The webhook allows to pass an optional ref as url path.
+#
+# Examples:
+#   curl <host>             ; Will deploy main ref
+#   curl <host>/blub        ; Will deploy blub ref
+
+while true; do
+    echo "Wait for webhook trigger ..."
+
+    # Wait until webhook is triggered and parse out optional branch info.
+    # The branch info can be passed via the url path, an example is:
+    #   GET /blub HTTP/1.1
+    REF=$(echo -e "HTTP/1.0 204 No Content\r\nConnection: close\r\n\r" | nc -l -p 80 | awk '/GET/ { print $2; }' | tr -d '/')
+    # If we got a ref use it else default to main.
+    REF=${REF:-main}
+
+    if [ ! -d blog ]; then
+        git clone https://git.memzero.de/blog
+    fi
+    git -C blog submodule init
+    git -C blog submodule update
+    git -C blog fetch --prune
+    echo "Checking out ref: $REF"
+    git -C blog checkout $REF || continue
+
+    zola --root blog build || continue
+
+    # webroot must be mounted at /www.
+    rm -rf /www/blog
+    mv blog/public /www/blog
+
+    echo "SUCCESS: Updated /www/blog"
+done