Installation step doesn't detect PNPM in a monorepo

[markgaze]

Describe the bug

If you have a monorepo, you set the base directory to one of sub-directories which does not contain the pnpm-lock.yaml file, which is in the top-level directory. Therefore, Netlify doesn't detect PNPM and tries to install with NPM, which fails - in my use case with:

npm ERR! code EUNSUPPORTEDPROTOCOL
npm ERR! Unsupported URL Type "workspace:": workspace:*

Steps to reproduce

1. Create a monorepo using PNPM (I'm also using Turborepo)
2. Setup a Netlify project with one of the subdirectories as it's base directory
3. Configure the build to cd back up to the top-level before running the build (see config)
4. Run a build on Netlify

(I'm not sure 3 is necessary, as I think it will still fail to find the pnpm-lock.yaml file even if this isn't the case)

Configuration

[build]
command = "cd ../.. && NEXT_PUBLIC_REVIEW_ID=$REVIEW_ID NEXT_PUBLIC_BRANCH=$BRANCH pnpm build-docs --filter=\"docs\""

Deploy logs

2:41:52 PM: Build ready to start
2:41:55 PM: build-image version: d05976bd3309b73a86eaa327bf80e105ff13f5e4 (focal)
2:41:55 PM: build-image tag: v4.13.0
2:41:55 PM: buildbot version: a3df1bd789b72c6280ab972860704adbfa8b1f49
2:41:55 PM: Fetching cached dependencies
2:41:56 PM: Starting to download cache of 333.7MB
2:41:59 PM: Finished downloading cache in 3.138357703s
2:41:59 PM: Starting to extract cache
2:42:01 PM: Finished extracting cache in 1.963945185s
2:42:01 PM: Finished fetching cache in 5.1901731s
2:42:01 PM: Starting to prepare the repo for build
2:42:02 PM: Preparing Git Reference pull/274/head
2:42:04 PM: Parsing package.json dependencies
2:42:05 PM: Different publish path detected, going to use the one specified in the Netlify configuration file: 'apps/docs/build' versus '.next' in the Netlify UI
2:42:05 PM: Different build command detected, going to use the one specified in the Netlify configuration file: 'cd ../.. && NEXT_PUBLIC_REVIEW_ID=$REVIEW_ID NEXT_PUBLIC_BRANCH=$BRANCH pnpm build-docs --filter="docs"' versus '' in the Netlify UI
2:42:05 PM: Detected ignore command in Netlify configuration file. Proceeding with the specified command: 'node scripts/ignore-build.js'
2:42:05 PM: Changes detected, continuing with build
2:42:05 PM: Starting build script
2:42:05 PM: Installing dependencies
2:42:05 PM: Python version set to 2.7
2:42:06 PM: Started restoring cached node version
2:42:07 PM: Finished restoring cached node version
2:42:07 PM: Downloading and installing node v16.18.0...
2:42:07 PM: Downloading https://nodejs.org/dist/v16.18.0/node-v16.18.0-linux-x64.tar.xz...
2:42:08 PM: Computing checksum with sha256sum
2:42:08 PM: Checksums matched!
2:42:10 PM: Enabling node corepack
2:42:10 PM: Started restoring cached build plugins
2:42:10 PM: Finished restoring cached build plugins
2:42:10 PM: Attempting ruby version 2.7.2, read from environment
2:42:11 PM: Using ruby version 2.7.2
2:42:11 PM: Using PHP version 8.0
2:42:11 PM: No npm workspaces detected
2:42:11 PM: Started restoring cached node modules
2:42:11 PM: Finished restoring cached node modules
2:42:11 PM: Installing NPM modules using NPM version 8.19.2
2:42:13 PM: npm ERR! code EUNSUPPORTEDPROTOCOL
2:42:13 PM: npm ERR! Unsupported URL Type "workspace:": workspace:*
2:42:13 PM: npm ERR! A complete log of this run can be found in:
2:42:13 PM: npm ERR!     /opt/buildhome/.npm/_logs/2022-10-20T13_42_12_237Z-debug-0.log
2:42:13 PM: Error during NPM install
2:42:13 PM: Build was terminated: Build script returned non-zero exit code: 1
2:42:13 PM: Creating deploy upload records
2:42:13 PM: Failing build: Failed to build site
2:42:13 PM: Failed during stage 'building site': Build script returned non-zero exit code: 1 (https://ntl.fyi/exit-code-1)
2:42:13 PM: Finished processing build request in 17.650495802s

[lukasholzer]

Hey yea this can be done currently via setting the environment variable NETLIFY_USE_PNPM=true inside the UI.

We are currently working on auto detecting this case see: netlify/build-image#858 and #4643

[markgaze]

Hey yea this can be done currently via setting the environment variable NETLIFY_USE_PNPM=true inside the UI.

We are currently working on auto detecting this case see: netlify/build-image#858 and #4643

Great stuff! Thanks for the workaround, I'll give that a go now and keep an eye out for that PR going in 🙂

[markgaze]

Worked a treat! 😄 Thanks again!