npm install on alpine is wrong

[kappelmi]

Hi
i am using this plugin on 2 instances of linux.
I have seen following error on 1 of the instance newly added to the system:

Task ':OlisWebGUI:npm_install' is not up-to-date because:
Task has not declared any outputs despite executing actions.
Starting process 'command '/home/jenkins/slave/workspace/test/workspace/OlisWeb/OlisWebGUI/.gradle/nodejs/node-v12.13.1-linux-x64/bin/npm''. Working directory: /home/jenkins/slave/workspace/test/workspace/OlisWeb/OlisWebGUI Command: /home/jenkins/slave/workspace/test/workspace/OlisWeb/OlisWebGUI/.gradle/nodejs/node-v12.13.1-linux-x64/bin/npm install
Successfully started process 'command '/home/jenkins/slave/workspace/test/workspace/OlisWeb/OlisWebGUI/.gradle/nodejs/node-v12.13.1-linux-x64/bin/npm''
env: can't execute 'node': No such file or directory
:OlisWebGUI:npm_install (Thread[Execution worker for ':' Thread 5,5,main]) completed. Took 0.066 secs.

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':OlisWebGUI:npm_install'.

Process 'command '/home/jenkins/slave/workspace/test/workspace/OlisWeb/OlisWebGUI/.gradle/nodejs/node-v12.13.1-linux-x64/bin/npm'' finished with non-zero exit value 127

after long debugging, i have found out, the linux i am using where this is failing is alpine, and it looks like, node original distro requires libc, but alpine uses musl

analyzing the official docker image from node:alpine it looks like, there is an unofficial distro for alpine linux.

would it be possible to fix the plugin, so it would detect alpine linux and download the proper distro from node/npm ?

Thanks,
kappelmi

[kappelmi]

pls also have a look in this file:
https://github.com/nodejs/docker-node/blob/c6bc44e84afcdb81d9749b7b034c60e916a519ad/10/alpine3.10/Dockerfile

[magro]

@kappelmi I'm experiencing the same issue on alpine, have you found a solution for this?

[deepy]

It's because alpine uses musl and there's no official nodejs for musl.
There's some more info in the fork at node-gradle/gradle-node-plugin#51