When setting up my blog, I decided that the only action I wanted to do to update the live version was to do git push.

To implement this, I skipped setting up a webhook server because I didn’t want to install the webhook server directly on the host : this would have used a port and required manual configuration of my reverse proxy (I use traefik).

Instead, I implemented it with :

Git hook

There is no post-push hook, that’s a point where using a Gitlab webhook would have been best. Instead I used the pre-push hook (in .git/hooks/pre-push) :

#! /usr/bin/env bash

ssh host /src/docker-services/active/personal-website/update.sh

Remote script

#! /usr/bin/env bash

SCRIPT_FOLDER=${0%/*}
SCRIPT_NAME=${0##*/}

DEBUG=1
ERROR_LOG_FILE=$SCRIPT_FOLDER/error-log.txt

# Cleanup
rm -f $ERROR_LOG_FILE

if [[ $1 != "--async-update" ]]; then
  cd $SCRIPT_FOLDER
  screen -S personal-website-update -d -m ./$SCRIPT_NAME --async-update
else
  sleep 10 # Wait for git push to complete

  LOG="$LOG Starting git pull"
  LOG+="\n $(git -C ./src pull 2>&1)"
  if [[ $? != 0 ]]; then
    LOG+="\n /!\ Error with git pull"
    echo -e "$LOG" > $ERROR_LOG_FILE
    exit 1
  fi

  # echo "Starting docker-compose up -d --build"
  LOG+="\n $(docker-compose up -d --build)"
  if [[ $? != 0 ]]; then
    LOG+="\n /!\ Error with docker-compose"
    echo -e "$LOG" > $SCRIPT_FOLDER/error-log.txt
    exit 1
  fi

  [[ $DEBUG == 1 ]] && echo -e "$LOG" > $SCRIPT_FOLDER/log.txt
  exit 0
fi

Blog docker image

As you can see in the script, I build an image and update the running container. Here are the Dockerfile and the docker-compose :

FROM klakegg/hugo:ext-alpine-onbuild AS hugo

FROM nginx
COPY --from=hugo /target /usr/share/nginx/html

services:
  blog:
    build:
      context: .
      args:
        HUGO_ENV_ARG: "production"
        HUGO_CMD: "-s /src/hugo-src"
    ports:
      - 8080:80

Note: This is note my actual docker-compose.yml file, I use labels to expose it through Traefik