What's the actual path of a Node app when using a builldpack?

pier · May 31, 2022, 9:34pm

I’m trying to use statics with a Node app.

I thought the buildpack would copy the Node app into an /app folder but this doesn’t work and I’m getting 404 errors:

[[statics]]
  guest_path = "/app/src/server/static"
  url_prefix = "/"

AFAIK Fly is using Heroku buildpacks and from all the references I’ve seen on Github, it seems like the work dir should indeed be /app.

Edit:

Indeed the work dir is /app but the statics just don’t work.

github.com

superfly/flyctl/blob/master/internal/build/imgsrc/builtins/defaultbuiltins.go#L12

      
        
            
            
var basicbuiltins = []Builtin{
            	{
            		Name:        "node",
            		Description: "Nodejs builtin",
            		Details: `Requires package.json, package-lock.json and an app in server.js. 
            Runs a production npm install and copies all files across. 
            When run will call npm start to start the application.
            Uses and exposes port 8080 internally.`,
            		Template: `FROM node:current-slim
            WORKDIR /app			
            COPY package.json .
            COPY package-lock.json .
            RUN npm install --production
            COPY . .
            RUN npm run build --if-present
            ENV PORT=8080
            EXPOSE 8080
            CMD [ "npm","start" ]
            	`,
            	},

Edit:

I’ve tried using guest_path = "./app/src/server/static" but it didn’t work either.

pier · May 31, 2022, 9:58pm

I ended up doing a console.log() and the workdir is /workspace.

Hopefully this will save others some time.

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What's the actual path of a Node app when using a builldpack?

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