`#` symbol in file path breaks Source Link during debugging.

[PathogenDavid]

Issue Description

When attempting to step into a method which is defined by a NuGet package with source link support, the debugger fails to load the file if its path includes a #.

Steps to Reproduce

1. Clone this repository https://github.com/PathogenPlayground/SourceLinkHashTagIssue
2. Place a breakpoint on line 6 of Program.cs
3. Start debugging
4. Attempt to step into FromInt32
5. Step back out to Program.cs
6. Attempt to step into Create

Expected Behavior

Stepping into both methods downloads and shows the source code files noted in the comments.

Actual Behavior

Stepping into FromInt32 works as expected.

Stepping into Create fails with the following error:

// Source file '/_/Biohazrd/#TypeReferences/TranslatedTypeReference.cs' could not be found
// on this computer. The PDB for this source file's module contained information to
// download the source file through Source Link, but the debugger's request to download
// this source file failed.
// 
// The request failed with HTTP status code 400 (BadRequest).
// 
// The URL where the source file will be downloaded from:
// https://raw.githubusercontent.com/MochiLibraries/Biohazrd/9e11ce098fa067438d7fbd032fb9a9cebffaab19/Biohazrd/#TypeReferences/TranslatedTypeReference.cs
// 
// For more information about Source Link and VS Code see:
// https://aka.ms/VSCode-DotNet-SourceLink

Based on the URL given in the error I would assume this is an issue of the # not being escaped as %23

Logs

OmniSharp log

Starting OmniSharp server at 6/24/2022, 3:10:49 PM
    Target: c:\Development\Playground\SourceLinkHashTagIssue\SourceLinkHashTagIssue.sln

OmniSharp server started with .NET 7.0.100-preview.5.22307.18
.
    Path: c:\Users\Pathogen-David\.vscode\extensions\ms-dotnettools.csharp-1.25.0-win32-x64\.omnisharp\1.39.0-net6.0\OmniSharp.dll
    PID: 30000

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on Windows 10.0.19044.0 (x64)
[info]: OmniSharp.Services.DotNetCliService
        Checking the 'DOTNET_ROOT' environment variable to find a .NET SDK
[info]: OmniSharp.Services.DotNetCliService
        Using the 'dotnet' on the PATH.
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 5 MSBuild instance(s)
            1: .NET Core SDK 7.0.100 17.3.0 - "C:\Program Files\dotnet\sdk\7.0.100-preview.5.22307.18\"
            2: .NET Core SDK 6.0.400 17.3.0 - "C:\Program Files\dotnet\sdk\6.0.400-preview.22301.10\"
            3: .NET Core SDK 6.0.301 17.2.0 - "C:\Program Files\dotnet\sdk\6.0.301\"
            4: .NET Core SDK 6.0.203 17.1.1 - "C:\Program Files\dotnet\sdk\6.0.203\"
            5: .NET Core SDK 6.0.202 17.1.1 - "C:\Program Files\dotnet\sdk\6.0.202\"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: .NET Core SDK 7.0.100 17.3.0 - "C:\Program Files\dotnet\sdk\7.0.100-preview.5.22307.18\"
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0
[info]: OmniSharp.MSBuild.ProjectSystem
        Detecting projects in 'c:\Development\Playground\SourceLinkHashTagIssue\SourceLinkHashTagIssue.sln'.
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'c:\Development\Playground\SourceLinkHashTagIssue\SourceLinkHashTagIssue\SourceLinkHashTagIssue.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
        Detecting CSX files in 'c:\Development\Playground\SourceLinkHashTagIssue'.
[info]: OmniSharp.Script.ScriptProjectSystem
        Did not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
        Configuration finished.
[info]: OmniSharp.Stdio.Host
        Omnisharp server running using Stdio at location 'c:\Development\Playground\SourceLinkHashTagIssue' on host 48820.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: c:\Development\Playground\SourceLinkHashTagIssue\SourceLinkHashTagIssue\SourceLinkHashTagIssue.csproj
[info]: OmniSharp.MSBuild.ProjectManager
        Successfully loaded project file 'c:\Development\Playground\SourceLinkHashTagIssue\SourceLinkHashTagIssue\SourceLinkHashTagIssue.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Adding project 'c:\Development\Playground\SourceLinkHashTagIssue\SourceLinkHashTagIssue\SourceLinkHashTagIssue.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Update project: SourceLinkHashTagIssue

C# log

(Log was empty)

Environment information

VSCode version: 1.68.1
C# Extension: 1.25.0

Dotnet Information

.NET SDK: Version: 7.0.100-preview.5.22307.18 Commit: bd8b088037

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19044
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\7.0.100-preview.5.22307.18\

global.json file:
Not found

Host:
Version: 7.0.0-preview.5.22301.12
Architecture: x64
Commit: 425fedc0fb

.NET SDKs installed:
1.0.3 [C:\Program Files\dotnet\sdk]
1.0.4 [C:\Program Files\dotnet\sdk]
1.1.0 [C:\Program Files\dotnet\sdk]
2.0.0 [C:\Program Files\dotnet\sdk]
2.0.2 [C:\Program Files\dotnet\sdk]
2.0.3 [C:\Program Files\dotnet\sdk]
2.1.2 [C:\Program Files\dotnet\sdk]
2.1.4 [C:\Program Files\dotnet\sdk]
2.1.100 [C:\Program Files\dotnet\sdk]
2.1.103 [C:\Program Files\dotnet\sdk]
2.1.104 [C:\Program Files\dotnet\sdk]
2.1.200 [C:\Program Files\dotnet\sdk]
2.1.201 [C:\Program Files\dotnet\sdk]
2.1.202 [C:\Program Files\dotnet\sdk]
2.1.400 [C:\Program Files\dotnet\sdk]
2.1.401 [C:\Program Files\dotnet\sdk]
2.1.402 [C:\Program Files\dotnet\sdk]
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2.1.526 [C:\Program Files\dotnet\sdk]
2.1.600 [C:\Program Files\dotnet\sdk]
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2.1.701 [C:\Program Files\dotnet\sdk]
2.1.818 [C:\Program Files\dotnet\sdk]
2.2.104 [C:\Program Files\dotnet\sdk]
2.2.105 [C:\Program Files\dotnet\sdk]
3.1.120 [C:\Program Files\dotnet\sdk]
3.1.420 [C:\Program Files\dotnet\sdk]
6.0.100-rc.2.20479.15 [C:\Program Files\dotnet\sdk]
5.0.103 [C:\Program Files\dotnet\sdk]
5.0.104 [C:\Program Files\dotnet\sdk]
5.0.202 [C:\Program Files\dotnet\sdk]
5.0.214 [C:\Program Files\dotnet\sdk]
5.0.303 [C:\Program Files\dotnet\sdk]
5.0.407 [C:\Program Files\dotnet\sdk]
5.0.408 [C:\Program Files\dotnet\sdk]
5.0.409 [C:\Program Files\dotnet\sdk]
7.0.202 [C:\Program Files\dotnet\sdk]
6.0.203 [C:\Program Files\dotnet\sdk]
6.0.301 [C:\Program Files\dotnet\sdk]
6.0.400-preview.22301.10 [C:\Program Files\dotnet\sdk]
8.0.100-preview.5.22307.18 [C:\Program Files\dotnet\sdk]

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Visual Studio Code Extensions

I'm fairly confident this isn't relevant. If there is concern that it is, I can repro in a fresh VSCode install with only Omnisharp.

[JoeRobich]

@davidwengier Is issue this on the Roslyn side or the debugger side?

[davidwengier]

I think this is probably an issue with the GitHub support in https://github.com/dotnet/sourcelink, and it needing to encode the URLs. I don't think the debugger could do it, because it would end up with https%3A%2F%2Fraw.githubusercontent.com%2FMochiLibraries%2FBiohazrd%2Fmain%2FBiohazrd%2F%23TypeReferences%2FTranslatedTypeReference.cs, as it wouldn't know what to encode and what not to.

/cc @tmat and @chuckries for their expert opinions.

[chuckries]

@davidwengier @tmat

The hash would be in the * portion of the source link json mapping, which is resolved by VS Debugger, so this is a debugger issue.

@tmat does dotnet/sourcelink already URL encode the portions of the URL that the debugger does not resolve? Is it safe to URL encode the * portion and concatenate the pieces?

[tmat]

SourceLinkMap does the escaping: https://github.com/dotnet/sourcelink/blob/main/src/SourceLink.Tools/SourceLinkMap.cs#L215

> Uri.EscapeDataString(@"Biohazrd/#TypeReferences/TranslatedTypeReference.cs")
"Biohazrd%2F%23TypeReferences%2FTranslatedTypeReference.cs"

[chuckries]

@tmat The VS Debugger does not currently leverage SourceLinkMap as our support predates it, this needs a fix in VS and the debugger portion of the C# Extension for VS Code.

[davidwengier]

Thank you both for the education :)

[tmat]

does dotnet/sourcelink already URL encode the portions of the URL that the debugger does not resolve? Is it safe to URL encode the * portion and concatenate the pieces?

The spec says "Each document is defined by a file path and a URL". The URL string should not need escaping when we read it from the JSON - it should already be well-formed URL (with special characters escaped as needed).

[tmat]

Test: https://github.com/dotnet/sourcelink/blob/main/src/SourceLink.Git.IntegrationTests/GitHubTests.cs#L217