#2361: Improved dotnet installation

[MeShehi]

This PR fixes #2361

Implemented changes:

• Added DOTNET_ROOT environment variable
• Added test for correct setup of environment variables

Testing instructions

Run the cli configuration with the following:

1. uninstall dotnet
2. install dotnet
3. env
4. Check that both DOTNET_HOME and DOTNET_ROOT have an exported path
5. Check also on ide dotnet --info

---

Checklist for this PR

Make sure everything is checked before merging this PR. For further info please also see
our DoD.

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat and not feature/921 fixed setup.bat). If no issue ID exists, title only.
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  with internal
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[coveralls]

Coverage Report for CI Build 32739066120

Coverage increased (+0.01%) to 73.504%

Details

• Coverage increased (+0.01%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 2 coverage regressions across 2 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

2 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
com/devonfw/tools/ide/tool/dotnet/DotNet.java	1	83.33%
com/devonfw/tools/ide/version/VersionSegment.java	1	91.86%

---

Coverage Stats

Relevant Lines:	18035
Covered Lines:	13860
Line Coverage:	76.85%
Relevant Branches:	8007
Covered Branches:	5282
Branch Coverage:	65.97%
Branches in Coverage %:	Yes
Coverage Strength:	3.28 hits per line

---

💛 - Coveralls

[majesteSil]

Thanks for the PR. Aside from the wrong positioning of the Changelog entry, I tested the changes on both Windows and Linux (WSL).Here are my findings:
The first three commands (ide uninstall dotnet, ide install dotnet, and ide env) work as expected on both operating systems.
However, running ide dotnet --info still throws an error on Linux (WSL). Since this ticket is specifically about making dotnet fully functional on Linux, we should look into this.
I have attached the log files for both Windows and Linux to this comment. Tip: You can use lnav or fzf to navigate through them easily. It might be an edge case with my specific WSL configuration, though I suspect it could be a general Linux issue.

My Suggestions, Could you please double-check the command on Linux? If this requires specific local setup, it would be great to update the PR description with the necessary prerequisites for testing.
IDEasy-ide-dotnet-09-42-56.log
IDEasy-ide-dotnet-09-44-21.log

[MeShehi]

However, running ide dotnet --info still throws an error on Linux (WSL).

I think we need to give this an extra look. I'm testing on Arch, could it be something to do with WSL? Regardless, I'll give it a proper look tomorrow morning

[MeShehi]

Afer a call with Majeste we confirmed that his issue was because of a missing library on his setup, moving this to Review

[hohwille]

@MeShehi thanks for your PR. Nice improvement. 👍 Seems that Microsoft with .NET does not follow common convetions to use DOTNET_HOME variable but DOTNET_ROOT.
Therefore your PR is a reasonable improvement. However, as I mentioned you are associating the wrong issue here.

[MeShehi]

I created a new issue and changed the referenced issue in this PR

[majesteSil]

Successfully tested with 2026.08.002 on Windows:
ide env
output:

...
 DOTNET_HOME=C:\Users\$USER\projects\IDEasy\software\dotnet
DOTNET_ROOT=C:\Users\$USER\projects\IDEasy\software\dotnet
DOTNET_VERSION=10*
...

ide dotnet --info

No CVEs found for version 10.0.400 of tool dotnet.
.NET SDK:
 Version:           10.0.400
 Commit:            14fbf8d527
 Workload version:  10.0.400-manifests.330ea142
 MSBuild version:   18.9.6+14fbf8d52

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.26200
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Users\$USER\projects\IDEasy\software\dotnet\sdk\10.0.400\
...
Environment variables:
  DOTNET_HOME                              [C:\Users\$USER\projects\_ide\software\default\dotnet\dotnet\10.0.400]
  DOTNET_ROOT                              [C:\Users\$USER\projects\_ide\software\default\dotnet\dotnet\10.0.400]
...

[majesteSil]

Successfully tested with 2026.08.002 on Linux(WSL):
ide env
output:

...
export DOTNET_HOME="/home/$USER/projects/IDEasy/software/dotnet"
export DOTNET_ROOT="/home/$USER/projects/IDEasy/software/dotnet"
DOTNET_VERSION="10*"
...

ide dotnet --info

...
.NET SDK:
 Version:           10.0.400
 Commit:            14fbf8d527
 Workload version:  10.0.400-manifests.330ea142
 MSBuild version:   18.9.6+14fbf8d52

Runtime Environment:
 OS Name:     ubuntu
 OS Version:  26.04
 OS Platform: Linux
 RID:         linux-x64
 Base Path:   /home/$USER/projects/_ide/software/default/dotnet/dotnet/10.0.400/sdk/10.0.400/
...