[Help] is there a way to install metals on vscode in centos7 offline?

[facebreeze]

Hi，
I need to run sbt built scala project in CentOS7 without internet connection, and I have successfully installed Vscode extension scala(Metals) with vsix file. After setup environment variable JAVA_HOME, the metals still can not start with following error:

OUTPUT.Metals

Metals version: 1.5.1
Fetching coursier
	% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
	                                 Dload  Upload   Total   Spent    Left  Speed
	
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
	0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
	0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
	curl: (6) Could not resolve host: github.com; Unknown error
	gzip: stdin: unexpected end of file
Failed to fetch coursier. You may want to try installing coursier manually and adding it to PATH.
Will try to use jar based coursier if Java is available on the machine.
Using coursier located at undefined
Checking Java in JAVA_HOME, which points to /workspace/xxx/tools/jvm/jdk-17.0.12
	java version "17.0.12" 2024-07-16 LTS
	Java(TM) SE Runtime Environment (build 17.0.12+8-LTS-286)
	Java HotSpot(TM) 64-Bit Server VM (build 17.0.12+8-LTS-286, mixed mode, sharing)
Using Java Home: /workspace/xxx/tools/jvm/jdk-17.0.12
Error while downloading https://repo1.maven.org/maven2/com/chuusai/shapeless_2.12/2.3.3/shapeless_2.12-2.3.3.jar: /workspace/xxx/COURSIER_HOME/.structure.lock (Permission denied), ignoring it
Downloading Metals failed with the following:
Process exited with code 255
  Metals version: 1.5.1  
  Server properties: -Xmx2G,-XX:+UseZGC,-XX:ZUncommitDelay=30,-XX:ZCollectionInterval=5,-XX:+IgnoreUnrecognizedVMOptions 
  Java configuration: 
    - coursier: /workspace/xxx/vscode_extensions/extensions/scalameta.metals-1.47.0/coursier-fallback.jar
    - coursier mirror: undefined
    - extra environment: [object Object]
    - java options: 
    - java path: /workspace/xxx/jvm/jdk-17.0.12/bin/java
    
Error, couldn't show release notes for Metals 1.5.1
Error: getaddrinfo ENOTFOUND api.github.com

OUTPUT.Extension Host:

2025-03-21 16:38:02.438 [info] Extension host with pid 62043 started
2025-03-21 16:38:02.438 [info] Skipping acquiring lock for /workspace/xxx/tools/VSCode-linux-x64-1.85/data/user-data/User/workspaceStorage/0487b1f6a393fcfebdba2604bf30bcd1.
2025-03-21 16:38:02.666 [info] ExtensionService#_doActivateExtension vscode.emmet, startup: false, activationEvent: 'onLanguage'
2025-03-21 16:38:02.682 [info] ExtensionService#_doActivateExtension vscode.json-language-features, startup: false, activationEvent: 'onLanguage:jsonc'
2025-03-21 16:38:02.730 [info] ExtensionService#_doActivateExtension vscode.typescript-language-features, startup: false, activationEvent: 'onLanguage:jsonc'
2025-03-21 16:38:03.497 [info] ExtensionService#_doActivateExtension vscode.git-base, startup: true, activationEvent: '*', root cause: vscode.git
2025-03-21 16:38:03.504 [info] ExtensionService#_doActivateExtension mjcrouch.perforce, startup: true, activationEvent: '*'
2025-03-21 16:38:03.562 [info] ExtensionService#_doActivateExtension scalameta.metals, startup: true, activationEvent: 'workspaceContains:build.sbt'
2025-03-21 16:38:06.761 [info] ExtensionService#_doActivateExtension vscode.git, startup: true, activationEvent: '*'
2025-03-21 16:38:06.805 [info] ExtensionService#_doActivateExtension vscode.github, startup: true, activationEvent: '*'
2025-03-21 16:38:11.630 [error] Error: Coursier exit: 255
	at ChildProcess.<anonymous> (/workspace/xxx/vscode_extensions/extensions/scalameta.metals-1.47.0/node_modules/metals-languageclient/lib/downloadProgress.js:24:19)
	at ChildProcess.emit (node:events:525:35)
	at maybeClose (node:internal/child_process:1091:16)
	at ChildProcess._handle.onexit (node:internal/child_process:302:5)
2025-03-21 16:38:13.431 [info] ExtensionService#_doActivateExtension vscode.debug-auto-launch, startup: false, activationEvent: 'onStartupFinished'
2025-03-21 16:38:13.438 [info] ExtensionService#_doActivateExtension vscode.merge-conflict, startup: false, activationEvent: 'onStartupFinished'
2025-03-21 16:38:13.456 [info] ExtensionService#_doActivateExtension monokai.theme-monokai-pro-vscode, startup: false, activationEvent: 'onStartupFinished'
2025-03-21 16:38:13.472 [info] ExtensionService#_doActivateExtension mshr-h.veriloghdl, startup: false, activationEvent: 'onStartupFinished'
2025-03-21 16:38:14.785 [info] ExtensionService#_doActivateExtension ScooterSoftware.bcompare-vscode, startup: false, activationEvent: 'onStartupFinished'
2025-03-21 16:38:14.857 [info] ExtensionService#_doActivateExtension vscodevim.vim, startup: false, activationEvent: 'onStartupFinished'
2025-03-21 16:38:15.055 [info] Eager extensions activated

Need help !!!

vscode version:

Version: 1.85.2
Commit: 8b3775030ed1a69b13e4f4c628c612102e30a681
Date: 2024-01-18T06:40:19.222Z
Electron: 25.9.7
ElectronBuildId: 26354273
Chromium: 114.0.5735.289
Node.js: 18.15.0
V8: 11.4.183.29-electron.0
OS: Linux x64 5.4.258-1.el7.elrepo.x86_64

Scala Metals:

[tgodzik]

The metals VS Code plugin doesn't contain the jars for the server, which is why it is trying to download it automatically 🤔 We currently do not have a way to make metals work without internet connection unfortunately. You would to download all dependencies beforehand, we do have a utility for that. It would probably be possible to have a separate extension, but it would be much larger.

[facebreeze]

Thanks a lot!

Some questions about what you mentioned:

1. Which utility can help download the dependencies needed by the plugin Metals?

2. In order to make Metals work, where should I put these downloaded jar files?

3. Is it possible to build a fat extension including all the dependencies which can work without internet connection ?

[tgodzik]

There is an alternative main you can use and with coursier it's cs launch --jvm 17 org.scalameta:metals_2.13:1.5.1 -M scala.meta.metals.DownloadDependencies`

you could potentially change the cache that coursier is using, copy that over and change again the cache location in metals properties. This should go like:
cs launch --jvm 17 org.scalameta:metals_2.13:1.5.1 -M scala.meta.metals.DownloadDependencies -- -J-Dcoursier.cache=./temp-cache-copy/ but I can't seem to force it to download things there 🤔

Is it possible to build a fat extension including all the dependencies which can work without internet connection ?

Should be possible, though nobody has done it yet.

[tgodzik]

Though, potentially, you could just use the output and copy those files. We haven't updated that recently so it's actually missing Scala 3 presentation compiler. We should add that to make more useful.

[tgodzik]

I added the missing jars and some better utility to scalameta/metals#7332

The problem I see that in order for Metals to work fully offline, we would need to download every possible combination of Scala version and tools needed for it. It is over 1GB of jars because of that, so it's not really viable to put that into an extension.

I could improve the utiity to have a list of versions to download for, which should reduce amount of needed jars, but that would only serve for specific user's needs. It wouldn't be all purpose.

[tgodzik]

I updated the PR to only download support for needed Scala versions, but we can't really get lower than 350 mb for all features to be supported. We could potentially just have a way of generating vsix files with the jars for specific Scala version, which could be useful in some cases

[facebreeze]

Hi,
Thanks! I'll try to download all these dependencies and copy these jar files to the offline machine to see if it works.

And it's meaningful to download specific version of dependencies since production environment usually do not update tool version unless necessary.