Publish airgapped image using stripped down preview server (#3264)

* Publish airgapped image using stripped down preview server

* update scripts

* move test port back to 8000

* uncomment again

* isolate air_gapped build scripts

* ensure preview/build.sh is still called

* ?? null coelescing does not work on older nodejs versions

Author: Mpdreamz

air_gapped/Dockerfile

@@ -1,48 +1,14 @@
-FROM docker.elastic.co/docs/preview:latest AS build
+FROM cgr.dev/chainguard/wolfi-base
 
-COPY air_gapped/work/target_repo.git /docs_build/.repos/target_repo.git
-
-FROM chainguard/wolfi-base:latest
-#FROM perl:5.42-bookworm
-RUN apk update
-RUN apk add perl
-RUN apk add curl
-RUN apk add perl-app-cpanminus
-
-RUN apk add gcc make git patch perl-dev wget
-RUN apk add openssl-dev
-RUN apk add zlib-dev
-RUN apk add perl-net-ssleay
-
-ENV PERL5LIB=/usr/local/lib/perl5
-ENV PATH=/usr/local/bin:$PATH
+RUN apk update && apk add nodejs git npm
 
-WORKDIR /
-RUN cpanm -n XML::LibXML
-RUN cpanm -n File::Copy::Recursive
-RUN cpanm -n Path::Class
-RUN cpanm -n Parallel::ForkManager
-RUN cpanm -n YAML
-#RUN apt update -y
-#RUN apt-get install -y perl
-#RUN apt-get install -y nginx
-#RUN apt-get install -y nodejs
-#RUN apt-get install -y git
-
-#RUN apt-get install -y libxml-simple-perl
-#RUN apt-get install -y libfile-copy-recursive-perl
-#RUN apt-get install -y libpath-class-perl
-#RUN apt-get install -y libcapture-tiny-perl
-#RUN apt-get install -y libparallel-forkmanager-perl
-#RUN apt-get install -y libyaml-perl
-
-RUN apk add nginx
-RUN apk add nodejs
-
-COPY --from=build /docs_build /docs_build
-COPY --from=build /node_modules /node_modules
+WORKDIR /app
+COPY air_gapped/work/target_repo.git /docs_build/.repos/target_repo.git
+COPY --chown=node:node preview /app/preview/
+COPY --chown=node:node template /app/template/
+COPY --chown=node:node preview/package.json /app/package.json
+WORKDIR /app
+RUN npm install
 
-RUN adduser -D nginx
-RUN mkdir -p /var/lib/nginx/tmp/
+ENTRYPOINT ["node", "preview/cli.js", "git", "/docs_build/.repos/target_repo.git"]
 
-CMD ["/docs_build/build_docs.pl", "--in_standard_docker", "--gapped", "--preview"]

air_gapped/Dockerfile.dockerignore

@@ -1,2 +1,4 @@
 *
 !air_gapped
+!preview
+!template

air_gapped/build.sh

@@ -19,6 +19,7 @@ mkdir air_gapped/work
 git clone --reference ~/.git-references/built-docs.git --dissociate \
   --depth 2 --branch master --bare \
   git@github.com:elastic/built-docs.git air_gapped/work/target_repo.git
+
 GIT_DIR=air_gapped/work/target_repo.git git fetch
 
 # Build the images

air_gapped/build_bk.sh

@@ -15,6 +15,7 @@ mkdir air_gapped/work
 git clone --reference /opt/git-mirrors/built-docs.git --dissociate \
   --depth 2 --branch master --bare \
   git@github.com:elastic/built-docs.git air_gapped/work/target_repo.git
+
 GIT_DIR=air_gapped/work/target_repo.git git fetch
 
 # Build the images

air_gapped/test.sh

@@ -10,10 +10,8 @@ set -e
 cd $(git rev-parse --show-toplevel)
 
 source ./air_gapped/build.sh
-id=$(docker run --rm \
-          --publish 8000:8000/tcp \
-          -d \
-          $AIR_GAPPED)
+id=$(docker run --rm --publish 8000:8000/tcp -d $AIR_GAPPED)
+
 echo "Started the air gapped docs. Some useful commands:"
 echo "   docker kill $id"
 echo "   docker logs -tf $id"

preview/package.json

@@ -0,0 +1,8 @@
+{
+  "license": "SEE LICENSE IN README.asciidoc",
+  "dependencies": {
+    "yargs": "^14.0.0",
+    "dedent": "^0.7.0",
+    "recursive-copy": "^2.0.10"
+  }
+}

preview/preview.js

@@ -188,7 +188,12 @@ const checkRedirects = async (core, path) => {
 
 module.exports = Core => {
   const server = http.createServer((request, response) => {
-    const parsedUrl = url.parse(request.url);
+    let host = process.env.HOST;
+    if (host == null || host === "") {
+      host = "localhost";
+    }
+
+    const parsedUrl = new URL(`http://${host}${request.url}`);
     const prefix = hostPrefix(request.headers['host']);
     const core = Core(prefix);
     requestHandler(core, parsedUrl, response)