isokit/.gitea/workflows/deploy-web.yml

name: Deploy web Studio

# Builds the web Studio (tools/build_web.py -> dist/web) and publishes it to
# https://isokit.buildfor.life/ on the buildfor.life web server (s1): the
# same Caddy, deploy user and two-directory swap as the blog and cnxvinyl.lol.
# One-time server setup (Caddy vhost, web root): deploy/Caddyfile.
#
# Secrets (repo or org level), the same ones the blog and cnx_vinyl use:
#   VPS_HOST, VPS_USER, VPS_SSH_KEY   required
#   VPS_PORT                          optional, default 22
#   VPS_KNOWN_HOSTS                   optional pinned host key line(s);
#                                     without it the key is scanned per run

on:
  push:
    branches: [master]
    paths:
      - "crates/**"
      - "studio/**"
      - "viewer/**"
      - "web/**"
      - "examples/demo/**"
      - "tools/build_web.py"
      - "Cargo.toml"
      - "Cargo.lock"
      - ".gitea/workflows/deploy-web.yml"
  workflow_dispatch:

# A newer push supersedes a running deploy. Safe to cancel mid-run: rsync
# writes the non-live directory and the rename swap happens last.
concurrency:
  group: deploy-isokit-web
  cancel-in-progress: true

jobs:
  deploy:
    runs-on: ubuntu-latest
    env:
      VPS_HOST: ${{ secrets.VPS_HOST }}
      VPS_USER: ${{ secrets.VPS_USER }}
      VPS_PORT: ${{ secrets.VPS_PORT }}
      SITE_DIR: /var/www/isokit.buildfor.life
      SITE_URL: https://isokit.buildfor.life
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install curl, python3, rsync if missing
        run: |
          missing=""
          for c in curl python3 rsync; do
            command -v "$c" > /dev/null || missing="$missing $c"
          done
          if [ -n "$missing" ]; then
            sudo=""
            [ "$(id -u)" = 0 ] || sudo=sudo
            # shellcheck disable=SC2086
            $sudo apt-get update && $sudo apt-get install -y $missing
          fi

      - name: Install Rust (rustup, wasm32 target) and the wasm-bindgen CLI
        # build_web.py wants rustup's cargo and the wasm-bindgen CLI at the
        # version in Cargo.lock; the CLI comes prebuilt from its GitHub release.
        run: |
          cargo_home=${CARGO_HOME:-$HOME/.cargo}
          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs |
            sh -s -- -y --profile minimal --default-toolchain stable --target wasm32-unknown-unknown --no-modify-path
          "$cargo_home/bin/rustup" target add wasm32-unknown-unknown
          echo "$cargo_home/bin" >> "$GITHUB_PATH"
          ver=$(grep -A1 '^name = "wasm-bindgen"$' Cargo.lock | sed -n 's/^version = "\(.*\)"$/\1/p')
          [ -n "$ver" ] || { echo "::error::no wasm-bindgen version in Cargo.lock"; exit 1; }
          tmp=$(mktemp -d)
          curl -sSfL "https://github.com/wasm-bindgen/wasm-bindgen/releases/download/$ver/wasm-bindgen-$ver-x86_64-unknown-linux-musl.tar.gz" |
            tar xz -C "$tmp"
          install -m 755 "$tmp/wasm-bindgen-$ver-x86_64-unknown-linux-musl/wasm-bindgen" "$cargo_home/bin/"
          "$cargo_home/bin/rustc" --version
          "$cargo_home/bin/wasm-bindgen" --version

      - name: Build dist/web
        run: |
          python3 tools/build_web.py
          echo "$GITHUB_SHA" > dist/web/version.txt

      - name: Set up SSH
        env:
          VPS_SSH_KEY: ${{ secrets.VPS_SSH_KEY }}
          VPS_KNOWN_HOSTS: ${{ secrets.VPS_KNOWN_HOSTS }}
        run: |
          if [ -z "$VPS_HOST" ] || [ -z "$VPS_USER" ] || [ -z "$VPS_SSH_KEY" ]; then
            echo "::error::VPS_HOST, VPS_USER and VPS_SSH_KEY must be set as Actions secrets (the blog's / cnx_vinyl's values)"
            exit 1
          fi
          port=${VPS_PORT:-22}
          mkdir -p ~/.ssh && chmod 700 ~/.ssh
          printf '%s\n' "$VPS_SSH_KEY" | tr -d '\r' > ~/.ssh/deploy_key
          chmod 600 ~/.ssh/deploy_key
          # Fail here, not at the server, when the secret is not a usable key,
          # and log its (public) fingerprint for comparison with
          # `ssh-keygen -lf ~deploy/.ssh/authorized_keys` on the server.
          if ! ssh-keygen -y -P "" -f ~/.ssh/deploy_key > ~/.ssh/deploy_key.pub 2> /dev/null; then
            echo "::error::VPS_SSH_KEY does not load as an unencrypted private key; paste the whole OpenSSH-format key including the BEGIN/END lines"
            exit 1
          fi
          echo "key in VPS_SSH_KEY: $(ssh-keygen -lf ~/.ssh/deploy_key.pub)"
          if [ -n "$VPS_KNOWN_HOSTS" ]; then
            printf '%s\n' "$VPS_KNOWN_HOSTS" >> ~/.ssh/known_hosts
          else
            for i in 1 2 3; do
              ssh-keyscan -T 10 -p "$port" "$VPS_HOST" > ~/.ssh/keyscan.out && [ -s ~/.ssh/keyscan.out ] && break
              echo "ssh-keyscan attempt $i failed; retrying in 15 s" >&2
              sleep 15
            done
            if [ ! -s ~/.ssh/keyscan.out ]; then
              echo "::error::ssh-keyscan could not reach $VPS_HOST:$port (server down or runner IP blocked?)"
              exit 1
            fi
            cat ~/.ssh/keyscan.out >> ~/.ssh/known_hosts
          fi
          {
            echo "Host webhost"
            echo "  HostName $VPS_HOST"
            echo "  User $VPS_USER"
            echo "  Port $port"
            echo "  IdentityFile ~/.ssh/deploy_key"
            echo "  IdentitiesOnly yes"
            echo "  BatchMode yes"
          } > ~/.ssh/config

      - name: Deploy (rsync to the idle copy, then rename swap)
        # Two persistent directories alternate as live and previous: rsync
        # only ever writes the one that is not live, and the swap is three
        # same-filesystem renames, so Caddy never serves a half-written tree.
        # The previous build stays on disk for rollback.
        run: |
          # SC2029: the paths are meant to expand on the runner side
          # shellcheck disable=SC2029
          ssh webhost "mkdir -p '$SITE_DIR' '$SITE_DIR-prev' && rm -rf '$SITE_DIR-tmp'"
          rsync -az --delete dist/web/ "webhost:$SITE_DIR-prev/"
          # shellcheck disable=SC2029
          ssh webhost "mv '$SITE_DIR' '$SITE_DIR-tmp' && mv '$SITE_DIR-prev' '$SITE_DIR' && mv '$SITE_DIR-tmp' '$SITE_DIR-prev'"
          # shellcheck disable=SC2029
          live=$(ssh webhost "cat '$SITE_DIR/version.txt'")
          echo "live on server: $live"
          [ "$live" = "$GITHUB_SHA" ] || { echo "::error::server holds $live, expected $GITHUB_SHA"; exit 1; }

      - name: Check the public URL
        # Warning only: DNS, Cloudflare or a login can make this fail while
        # the files on the server are already correct.
        run: |
          got=$(curl -sS --max-time 20 "$SITE_URL/version.txt?nocache=$GITHUB_SHA" || true)
          if [ "$got" = "$GITHUB_SHA" ]; then
            echo "$SITE_URL serves $GITHUB_SHA"
          else
            echo "::warning::$SITE_URL/version.txt returned '${got:0:80}', expected $GITHUB_SHA"
          fi