Support CachyOS

[Spirit2113]

Type: Bug

Issue Description

Cant get the C# Dev Kit to work with CachyOS. Dotnet but the OS detection isnt working for CachyOS.

Steps to Reproduce

Install CachyOS
install dotnet
install vscode

Expected Behavior

the OS detection includes CachyOS

Actual Behavior

.NET install tool can`t handle CachyOS

Logs

Could not find the architecture of the dotnet host /usr/share/dotnet/sdk. If this host does not match the architecture x64:
Please set the PATH to a dotnet host that matches the architecture x64. An incorrect architecture will cause instability for the extension ms-dotnettools.csharp.

Using configured .NET path: /usr/share/dotnet/sdk

Could not find the architecture of the dotnet host /usr/share/dotnet/sdk. If this host does not match the architecture x64:

exthost.zip

Please set the PATH to a dotnet host that matches the architecture x64. An incorrect architecture will cause instability for the extension ms-dotnettools.csharp.

Using configured .NET path: /usr/share/dotnet/sdk
Cancelled Installation of .NET notAnAcquisitionRequest-globalx64.
We are unable to detect the distro or version of your machine
Cancelled Installation of .NET notAnAcquisitionRequest-globalx64.
We are unable to detect the distro or version of your machine ... does /etc/os-release exist?
Cancelled Installation of .NET undefined.
An active-support version of dotnet couldn't be found. Discovered versions: []
Cancelled Installation of .NET notAnAcquisitionRequest-globalx64.
We are unable to detect the distro or version of your machine
Cancelled Installation of .NET notAnAcquisitionRequest-globalx64.
We are unable to detect the distro or version of your machine ... does /etc/os-release exist?
Cancelled Installation of .NET undefined.
An active-support version of dotnet couldn't be found. Discovered versions: []

C# log

2025-07-17 08:47:50.554 [info] Locating .NET runtime version 9.0.1
2025-07-17 08:47:50.669 [info] Dotnet path: /usr/share/dotnet/sdk
2025-07-17 08:47:50.669 [info] Activating C# + C# Dev Kit...
2025-07-17 08:47:50.923 [info] [stdout] info: Program[0]
Server started with process ID 5659

2025-07-17 08:47:51.138 [info] [stdout] {"pipeName":"/tmp/1f0bc658.sock"}

2025-07-17 08:47:51.138 [info] received named pipe information from server
2025-07-17 08:47:51.139 [info] client has connected to server
2025-07-17 08:47:51.219 [info] [Info - 08:47:51] [Program] Language server initialized

C# LSP Trace Logs

nothing

Environment information

VSCode version: 1.102.1
C# Extension: 2.84.19
Using OmniSharp: false

Dotnet Information

.NET SDK: Version: 9.0.301 Commit: a596cd22e2 Workload version: 9.0.300-manifests.fadeff71 MSBuild version: 17.14.5+edd3bbf37

Runtime Environment:
OS Name: cachyos
OS Version:
OS Platform: Linux
RID: linux-x64
Base Path: /usr/share/dotnet/sdk/9.0.301/

.NET workloads installed:
There are no installed workloads to display.
Configured to use loose manifests when installing new manifests.

Host:
Version: 9.0.6
Architecture: x64
Commit: 3875b54e7b

.NET SDKs installed:
8.0.115 [/usr/share/dotnet/sdk]
9.0.301 [/usr/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 9.0.6 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.15 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 9.0.6 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
DOTNET_ROOT [/usr/share/dotnet]

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Visual Studio Code Extensions

Extension	Author	Version	Folder Name
copilot	GitHub	1.344.0	github.copilot-1.344.0
copilot-chat	GitHub	0.29.1	github.copilot-chat-0.29.1
csdevkit	ms-dotnettools	1.30.44	ms-dotnettools.csdevkit-1.30.44-linux-x64
csharp	ms-dotnettools	2.84.19	ms-dotnettools.csharp-2.84.19-linux-x64
geminicodeassist	google	2.40.0	google.geminicodeassist-2.40.0
vscode-dotnet-runtime	ms-dotnettools	2.3.6	ms-dotnettools.vscode-dotnet-runtime-2.3.6

Extension version: 2.84.19
VS Code version: Code 1.102.1 (7adae6a56e34cb64d08899664b814cf620465925, 2025-07-15T16:41:17.147Z)
OS version: Linux x64 6.15.6-2-cachyos
Modes:

System Info

Item	Value
CPUs	AMD Ryzen 7 6800H with Radeon Graphics (16 x 3044)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off webnn: disabled_off
Load (avg)	1, 1, 0
Memory (System)	14.88GB (10.24GB free)
Process Argv	--crash-reporter-id bbe5be79-8b93-4c07-8c3e-f6545112c5a7
Screen Reader	no
VM	0%
DESKTOP_SESSION	plasma
XDG_CURRENT_DESKTOP	KDE
XDG_SESSION_DESKTOP	KDE
XDG_SESSION_TYPE	wayland

A/B Experiments

vsliv368:30146709
binariesv615:30325510
0bi6i642:31349325
2e7ec940:31000449
nativeloc1:31344060
5fd0e150:31155592
dwcopilot:31170013
6074i472:31201624
dwoutputs:31242946
hdaa2157:31222309
copilot_t_ci:31333650
e5gg6876:31282496
pythoneinst12:31285622
c7cif404:31314491
pythonpulldiag:31343502
996jf627:31283433
pythonrdcb7:31342333
usemplatestapi:31297334
0aa6g176:31307128
747dc170:31275177
aj953862:31281341
generatesymbolt:31295002
convertfstringf:31295003
9d2cg352:31346308
convertlamdat:31329272
usemarketplace:31343026
nesew2to5:31336538
agentclaude:31335815
82j33506:31327384
nes-diff-11:31337487
2j0jg872-first:31348500
replacestringexc:31348966
testaa123cf:31335227
6abeh943:31336334
yijiwantestdri0626-c:31336931
64bie973:31348971
4gdec884:31348710
editstats-enabled:31346257

[JoeRobich]

Using configured .NET path: /usr/share/dotnet/sdk

@Spirit2113 I would have expected the .NET path to be /usr/share/dotnet/dotnet. Did you manually configure this path? Did you rename the dotnet CLI in your install?

[JoeRobich]

Moving this to the .NET Install Tool repo

[nagilson]

What architecture / cpu is your machine using?

[nagilson]

jk got it, its amd64

[nagilson]

Can you try to go to the settings of the .NET Install Tool and check the setting 'Allow Invalid Paths'?

[nagilson]

If you want to the UI to work, we accept community contributions for that. We don't support the UI install in Arch atm for SDKs

[nagilson]

#2345 should fix the distro detect logic

[Spirit2113]

@JoeRobich
its the same failure.
did test various paths

@nagilson
that was one of the first things i configured
also: Allow Invalid Paths'

did ask gemini and chatgpt to fix this problem but cant get it running

[Spirit2113]

so a small update from me.
after adding the line VERSION_ID=rolling to /etc/os-release

thats the new failure

2025-07-23 23:44:13.443 [info] Locating .NET runtime version 9.0.1
2025-07-23 23:44:13.578 [info] Dotnet path: /usr/share/dotnet
2025-07-23 23:44:13.578 [info] Activating C# + C# Dev Kit...
2025-07-23 23:44:13.657 [error] [stderr] You must install .NET to run this application.

App: /home/flow/.vscode/extensions/ms-dotnettools.csharp-2.84.19-linux-x64/.roslyn/Microsoft.CodeAnalysis.LanguageServer
Architecture: x64
App host version: 9.0.5
.NET location: Not found

Learn more:
https://aka.ms/dotnet/app-launch-failed

Download the .NET runtime:
https://aka.ms/dotnet-core-applaunch?missing_runtime=true&arch=x64&rid=linux-x64&os=cachyos&apphost_version=9.0.5

2025-07-23 23:44:13.657 [info] Language server process exited with 131
2025-07-23 23:44:13.658 [info] [Error - 23:44:13] Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server.
2025-07-23 23:44:13.658 [info] Error: Language server process exited unexpectedly
    at ChildProcess.<anonymous> (/home/flow/.vscode/extensions/ms-dotnettools.csharp-2.84.19-linux-x64/dist/extension.js:1227:24605)
    at ChildProcess.emit (node:events:530:35)
    at Process.ChildProcess._handle.onexit (node:internal/child_process:293:12)

after this i added
/usr/share/dotnet
to the omnisharp.dotnetpath

and also
set -gx DOTNET_ROOT /usr/share/dotnet
to my ~/.config/fish/config.fish

but its not working and get the same output as befor

[nagilson]

/usr/share/dotnet seems like a better path than the prior one. Do you have the ASP.NET Core .NET 9 Runtime installed? Please install that. You can check by running /usr/share/dotnet --info.