With .Net 6 Preview7, failed to open '/etc/dotnet/install_location' when running dotnet tool

[WenJunJi01]

Repro steps:

1. Install .NET 6 Preview7 SDK(6.0.100-preview.7.21369.19)
2. Run below commands:
   dotnet tool install -g doTNetsay
   dotnet tool list -g
   dotnetsay

Expected Result:
Tool dotnetsay can be run successfully

Actual Result:
Failed to open '/etc/dotnet/install_location' when running dotnet tool:
The install_location file ['/etc/dotnet/install_location'] failed to open: No such file or directory.

Note: Not repro Windows10

Dotnet info:
.NET SDK (reflecting any global.json):
Version: 6.0.100-preview.7.21369.19
Commit: cdbd475cb6

Runtime Environment:
OS Name: ubuntu
OS Version: 18.04
OS Platform: Linux
RID: ubuntu.18.04-x64
Base Path: /usr/share/dotnet/sdk/6.0.100-preview.7.21369.19/

Host (useful for support):
Version: 6.0.0-preview.7.21368.2
Commit: 8d3afa3

.NET SDKs installed:
6.0.100-preview.7.21369.19 [/usr/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.0-preview.7.21369.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.0-preview.7.21368.2 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
https://aka.ms/dotnet-download

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[wli3]

@mikem8361 could you look into this install_location issue?

[wli3]

@vitek-karas

[mikem8361]

Why did I get assigned this issue?

[ghost]

Tagging subscribers to this area: @vitek-karas, @agocke, @VSadov
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Repro steps:

1. Install .NET 6 Preview7 SDK(6.0.100-preview.7.21369.19)
2. Run below commands:
   dotnet tool install -g doTNetsay
   dotnet tool list -g
   dotnetsay

Expected Result:
Tool dotnetsay can be run successfully

Actual Result:
Failed to open '/etc/dotnet/install_location' when running dotnet tool:
The install_location file ['/etc/dotnet/install_location'] failed to open: No such file or directory.

Note: Not repro Windows10

Dotnet info:
.NET SDK (reflecting any global.json):
Version: 6.0.100-preview.7.21369.19
Commit: cdbd475cb6

Runtime Environment:
OS Name: ubuntu
OS Version: 18.04
OS Platform: Linux
RID: ubuntu.18.04-x64
Base Path: /usr/share/dotnet/sdk/6.0.100-preview.7.21369.19/

Host (useful for support):
Version: 6.0.0-preview.7.21368.2
Commit: 8d3afa3

.NET SDKs installed:
6.0.100-preview.7.21369.19 [/usr/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.0-preview.7.21369.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.0-preview.7.21368.2 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
https://aka.ms/dotnet-download

Author:	WenJunJi01
Assignees:	mateoatr
Labels:	area-Host, untriaged
Milestone:	-

[vitek-karas]

I'm gonna give this a shot of fixing (to refresh my linux debugging non-skills).

[agocke]

Looks like that error should not be printed, but it is not causing any other side effects (the process is not exiting) so I don't think this is blocking

[vitek-karas]

It is blocking - we can't alter an output (stderr or stdout) of a console app if it works - the entire functionality of the app might be to print something to stderr and if something else tries to parse it it would be broken.

[mateoatr]

We must change this to info:

runtime/src/native/corehost/hostmisc/pal.unix.cpp

Lines 441 to 445 in 09e1608

	if (install_location_file == nullptr)
	{
	trace::error(_X("The install_location file ['%s'] failed to open: %s."), install_location_file_path.c_str(), pal::strerror(errno));
	return false;
	}

[agocke]

This is blocking Preview 7?

[vitek-karas]

I have a candidate fix https://github.com/dotnet/runtime/compare/main...vitek-karas:FixErrorOnInstallLocation?expand=1

Trying to test it.

[vitek-karas]

Blocking Preview 7 - don't know - it might. It's pretty bad and there's really no work around (creating the file is one, but one needs to know what to put into it).