"node: command not found" when using nvm and sudo/root

[Markshall]

I'm running an npm install script inside a directory that I've cloned from git, one of the dependancies is Sharp, but when I run npm install, it tells me that node and node-gyp commands don't exist and yells at me about an install script that Sharp tries to execute:
(node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)

My computer is running node 14.15.0 and npm 7.5.2 and it works fine there.
When I try on an Amazon Linux 2 EC2 instance to serve this app on the internet, running node 14.15.0 and npm 6.14.8 (through nvm), I get this crashing error.

---

Did you see the documentation relating to installation?
Yes

Have you ensured the architecture and platform of Node.js used for npm install is the same as the architecture and platform of Node.js used at runtime?
Yes (I think?). Using node 14.15.0 (npm 6.14.8) via nvm

Are you using the latest version? Is the version currently in use as reported by npm ls sharp the same as the latest version as reported by npm view sharp dist-tags.latest?
Yes (0.27.2)

If you are using npm v6 or earlier and installing as a root or sudo user, have you tried with the npm install --unsafe-perm flag?
Yes, I get the same error

If you are using npm v7, does the user running npm install own the directory it is run in?
N/A

If you are using the ignore-scripts feature of npm, have you tried with the npm install --ignore-scripts=false flag?
I don't use ignore-scripts, but I tried the flag regardless and got the same error.

What is the complete output of running npm install --verbose sharp? Have you checked this output for useful error messages?

npm info it worked if it ends with ok
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npm info lifecycle array-flatten@3.0.0~install: array-flatten@3.0.0
npm info lifecycle color@3.1.3~install: color@3.1.3
npm info lifecycle node-addon-api@3.1.0~install: node-addon-api@3.1.0
npm info lifecycle prebuild-install@6.0.1~install: prebuild-install@6.0.1
npm info lifecycle semver@7.3.4~install: semver@7.3.4
npm info lifecycle simple-get@4.0.0~install: simple-get@4.0.0
npm info lifecycle sharp@0.27.2~install: sharp@0.27.2

> sharp@0.27.2 install /var/www/html/node_modules/sharp
> (node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)

sh: node: command not found
sh: node-gyp: command not found
npm verb lifecycle sharp@0.27.2~install: unsafe-perm in lifecycle false
npm verb lifecycle sharp@0.27.2~install: PATH: /root/.nvm/versions/node/v14.15.0/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/var/www/html/node_modules/sharp/node_modules/.bin:/var/www/html/node_modules/.bin:/root/.nvm/versions/node/v14.15.0/bin:/sbin:/bin:/usr/sbin:/usr/bin
npm verb lifecycle sharp@0.27.2~install: CWD: /var/www/html/node_modules/sharp
npm info lifecycle sharp@0.27.2~install: Failed to exec install script
npm timing action:install Completed in 38ms
npm verb unlock done using /root/.npm/_locks/staging-dff8604cf3b8aea3.lock for /var/www/html/node_modules/.staging
npm timing stage:rollbackFailedOptional Completed in 101ms
npm timing stage:runTopLevelLifecycles Completed in 2618ms

npm verb stack Error: sharp@0.27.2 install: `(node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)`
npm verb stack spawn ENOENT
npm verb stack     at ChildProcess.<anonymous> (/root/.nvm/versions/node/v14.15.0/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:48:18)
npm verb stack     at ChildProcess.emit (events.js:315:20)
npm verb stack     at maybeClose (internal/child_process.js:1048:16)
npm verb stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:288:5)
npm verb pkgid sharp@0.27.2
npm verb cwd /var/www/html
npm verb Linux 4.14.219-164.354.amzn2.x86_64
npm verb argv "/root/.nvm/versions/node/v14.15.0/bin/node" "/root/.nvm/versions/node/v14.15.0/bin/npm" "install" "--verbose" "sharp"
npm verb node v14.15.0
npm verb npm  v6.14.8
npm ERR! code ELIFECYCLE
npm ERR! syscall spawn
npm ERR! file sh
npm ERR! errno ENOENT
npm ERR! sharp@0.27.2 install: `(node install/libvips && node install/dll-copy && prebuild-install) || (node-gyp rebuild && node install/dll-copy)`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the sharp@0.27.2 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm verb exit [ 1, true ]
npm timing npm Completed in 2995ms

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2021-03-22T14_04_57_489Z-debug.log

What is the output of running npx envinfo --binaries --system?

npx: installed 1 in 1.016s

  System:
    OS: Linux 4.14 Amazon Linux 2
    CPU: (2) x64 Intel(R) Xeon(R) CPU E5-2676 v3 @ 2.40GHz
    Memory: 2.48 GB / 3.85 GB
    Container: Yes
    Shell: 4.2.46 - /bin/bash
  Binaries:
    Node: 14.15.0 - ~/.nvm/versions/node/v14.15.0/bin/node
    npm: 6.14.8 - ~/.nvm/versions/node/v14.15.0/bin/npm

[lovell]

Hello, the salient part of the error is:

sh: node: command not found

Please can you ensure that Node.js has been installed correctly. I notice you're using nvm and running as sudo/root - check that it has modified the PATH correctly - you might have run into nvm-sh/nvm#43

[Markshall]

@lovell thanks for your quick reply. Weirdly, I think I've fixed it. I changed my node version to 14.15.0 on my EC2 instance, but installed the latest version of npm using nvm install --latest-npm which brought me to npm version 7.6.3 which I think solved my issue.
I had to run npm rebuild sharp and then managed to do npm install and it seemed to work no problem for me.

Not sure what the overriding issue was, perhaps a mismatch in npm versions?

Either way, this is solved for me for now so I'll close the comment. Loving Sharp by the way!