dotnet publish fails when RunAOTCompilation is set to true

[veertien]

Describe the bug

In my docker container, the dotnet publish command fails here:

...
dotnet/sdk#19 22.00   [29/29] System.Private.CoreLib.dll -> System.Private.CoreLib.dll.bc
dotnet/sdk#19 22.07 /usr/share/dotnet/packs/Microsoft.NET.Runtime.WebAssembly.Sdk/6.0.0-rc.1.21451.13/Sdk/WasmApp.Native.targets(394,5): error MSB3073: The command "emcc --version" exited with code 1. [/src/Client/example1.Client.csproj]
------
executor failed running [/bin/sh -c dotnet publish "example1.Server.csproj" -c Release -o /app/publish]: exit code: 1
C:\git\example1>

To Reproduce

Create blazor wasm project with

dotnet new blazorwasm --hosted 

• Add a Dockerfile with the dotnet 6 sdk

  • Install the wasm-tools workload

• Update the Client project file to include:

  <RunAOTCompilation>true</RunAOTCompilation>

build the image

See this repo: https://github.com/veertien/example-blazor-aot

Exceptions (if any)

error MSB3073: The command "emcc --version" exited with code 1. 

Further technical details

docker run mcr.microsoft.com/dotnet/sdk:6.0 dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.100-rc.1.21458.32
 Commit:    d7c22323c4

Runtime Environment:
 OS Name:     debian
 OS Version:  11
 OS Platform: Linux
 RID:         debian.11-x64
 Base Path:   /usr/share/dotnet/sdk/6.0.100-rc.1.21458.32/

Host (useful for support):
  Version: 6.0.0-rc.1.21451.13
  Commit:  d7619cd4b1

.NET SDKs installed:
  6.0.100-rc.1.21458.32 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.0-rc.1.21452.15 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.0-rc.1.21451.13 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

[dotnet-issue-labeler]

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[dotnet-issue-labeler]

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[pranavkm]

FYI @radical

[ghost]

Tagging subscribers to 'arch-wasm': @lewing
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Describe the bug

In my docker container, the dotnet publish command fails here:

...
dotnet/sdk#19 22.00   [29/29] System.Private.CoreLib.dll -> System.Private.CoreLib.dll.bc
dotnet/sdk#19 22.07 /usr/share/dotnet/packs/Microsoft.NET.Runtime.WebAssembly.Sdk/6.0.0-rc.1.21451.13/Sdk/WasmApp.Native.targets(394,5): error MSB3073: The command "emcc --version" exited with code 1. [/src/Client/example1.Client.csproj]
------
executor failed running [/bin/sh -c dotnet publish "example1.Server.csproj" -c Release -o /app/publish]: exit code: 1
C:\git\example1>

To Reproduce

Create blazor wasm project with

dotnet new blazorwasm --hosted 

• Add a Dockerfile with the dotnet 6 sdk

  • Install the wasm-tools workload

• Update the Client project file to include:

  <RunAOTCompilation>true</RunAOTCompilation>

build the image

See this repo: https://github.com/veertien/example-blazor-aot

Exceptions (if any)

error MSB3073: The command "emcc --version" exited with code 1. 

Further technical details

docker run mcr.microsoft.com/dotnet/sdk:6.0 dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.100-rc.1.21458.32
 Commit:    d7c22323c4

Runtime Environment:
 OS Name:     debian
 OS Version:  11
 OS Platform: Linux
 RID:         debian.11-x64
 Base Path:   /usr/share/dotnet/sdk/6.0.100-rc.1.21458.32/

Host (useful for support):
  Version: 6.0.0-rc.1.21451.13
  Commit:  d7619cd4b1

.NET SDKs installed:
  6.0.100-rc.1.21458.32 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.0-rc.1.21452.15 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.0-rc.1.21451.13 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Author:	veertien
Assignees:	-
Labels:	arch-wasm, untriaged, area-Build-mono
Milestone:	-

[radical]

@veertien Could you please share the binlog? Run the build with -bl adding to the command line, and attach the generated msbuild.binlog.

[veertien]

@radical , attached is the msbuild.binlog you requested.
msbuild.zip

[radical]

@veertien thank you for the log! From the log:

Environment Variables passed to tool: (TaskId:476)
...
  PATH=/usr/share/dotnet/packs/Microsoft.NET.Runtime.Emscripten.2.0.23.Node.linux-x64/6.0.0-rc.2.21474.1/Sdk/../tools/bin:/usr/share/dotnet/packs/Microsoft.NET.Runtime.Emscripten.2.0.23.Sdk.linux-x64/6.0.0-rc.2.21474.1/Sdk/../tools/bin:/usr/share/dotnet/packs/Microsoft.NET.Runtime.Emscripten.2.0.23.Sdk.linux-x64/6.0.0-rc.2.21474.1/Sdk/../tools/emscripten:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin (TaskId:476)

emcc --version (TaskId:476)
unable to find python in $PATH (TaskId:476)

Python is not installed, or not available in $PATH.

note to self: fix our targets to better surface the error from emcc --version.

[radical]

emcc --version (TaskId:476)
unable to find python in $PATH (TaskId:476)

Python is not installed, or not available in $PATH.

Installing python, and making sure that it is in PATH should fix this issue. Please re-open, if it doesn't.

Closing this based on the above, and opened an issue for surfacing the errors to the user - #61067 .