Quiet option to only print to console in case of error

Steps to reproduce

Run dotnet restore --v:q or dotnet build --v:q.

Expected behavior

Do not print to console unless there are errors.

Actual behavior

Prints to console:

Restoring packages for /xxx/app.csproj...
Generating MSBuild file /xxx/
Generating MSBuild file /xxx/
Writing lock file to disk. Path: /xxx/
Restore completed in 998.62 ms for /xxx/
  
NuGet Config files used:
    /Users/lutzroeder/.nuget/NuGet/NuGet.Config
  
Feeds used:
    https://api.nuget.org/v3/index.json

Environment data

.NET Command Line Tools (1.0.1)

Product Information: Version: 1.0.1 Commit SHA-1 hash: 005db40cd1

Runtime Environment: OS Name: Mac OS X OS Version: 10.12 OS Platform: Darwin RID: osx.10.12-x64 Base Path: /usr/local/share/dotnet/sdk/1.0.1

[vincentwoo]

Seconded. That verbosity on quiet still prints pointless banner text is very odd:

root@64e3de0498da:~# dotnet build --verbosity q
Microsoft (R) Build Engine version 15.3.409.57025 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.


Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:01.31

[rainersigwald]

@0xced fyi, that particular message is emitted by MSBuild and suppressible by -nologo since .NET Core SDK 1.0.

You can also disable the summary with -consoleLoggerParameters:NoSummary.

I’m going to close this issue. It’s not the default behavior (MSBuild on Windows was designed to be super chatty, not really following the UNIXy output-only-on-error philosophy), but it’s accomplishable:

$ dotnet build -nologo -consoleLoggerParameters:NoSummary -verbosity:quiet

$ echo $?
0

$ echo "syntax error">> Class1.cs

$ dotnet build -nologo -consoleLoggerParameters:NoSummary -verbosity:quiet
Class1.cs(9,13): error CS1002: ; expected [/Users/raines/src/quiet/quiet.csproj]

$ echo $?
1

You can use a Directory.Build.rsp to make that the default for your repo if you like.