dotnet publish编译时间太长 · Issue #24057 · dotnet/sdk

Describe the bug

我使用命令 dotnet publish "myprojectname" -c release -o "out/to/path" -f netcoreapp2.1 发布我的Asp.net core 2.1 的网站，但是耗时非常的长，几乎都在10分钟以上，有时候甚至达到40分钟以上。
我的项目是一个前后端混合的结构，大概如下：
|-- web
      |-- node_modules
      |-- Controllers
      |-- src #这个目录用于存放前端代码
      |-- wwwroot 前端打包后的输出目录 
后端代码的编译过程很快2分钟以内结束，但是到了输出目录阶段就变得很慢。
我已经预先排查过原因，最后发现是，dotnet会扫描 node_modules目录，主要的消耗时间都是因为它。但是我试过了多种禁用手段都无法禁止dotnet扫描node_modules。
我的项目配置如下：
<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
	  <DefaultItemExcludes>$(DefaultItemExcludes);node_modules**</DefaultItemExcludes>
  </PropertyGroup>
  <ItemGroup>
    <Compile Remove="node_modules\**" />
    <Content Remove="node_modules\**" />
    <EmbeddedResource Remove="node_modules\**" />
    <None Remove="node_modules\**" />
  </ItemGroup>
	<ItemGroup>
		<Content Update="node_modules\**\*.*" CopyToPublishDirectory="Never" />
	</ItemGroup>
  <ItemGroup>
    <Folder Include="wwwroot\" />
  </ItemGroup>
  <ItemGroup>
    <!--其他依赖-->
    <PackageReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />
  </ItemGroup>
</Project>
Further technical details
Include the output of dotnet --info
> dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.102
 Commit:    02d5242ed7
Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.17763
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\6.0.102\
Host (useful for support):
  Version: 6.0.2
  Commit:  839cdfb0ec
.NET SDKs installed:
  2.1.818 [C:\Program Files\dotnet\sdk]
  6.0.102 [C:\Program Files\dotnet\sdk]
.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download
Partial translation:
Describe the bug
I'm using commandline dotnet publish "myprojectname" -c release -o "out/to/path" -f netcoreapp2.1 publishing my Asp.net core 2.1 website，but it took very long，almost cases needs more than 10 minuites，sometimes even need more than 40 minuites。
Here is my project structure：
|-- web
      |-- node_modules
      |-- Controllers
      |-- src  // This folder contains frontend code
      |-- wwwroot // This folder contains built frontend
Backend can be built in 2min, 但是到了输出目录阶段就变得很慢。
我已经预先排查过原因，最后发现是，dotnet scans folder node_modules, this is the main issue that wastes time。但是我试过了多种禁用手段都 can't stop dotnet from scanning node_modules。
Here is my project configuration：
<PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
	  <DefaultItemExcludes>$(DefaultItemExcludes);node_modules**</DefaultItemExcludes>
  </PropertyGroup>
  <ItemGroup>
    <Compile Remove="node_modules\**" />
    <Content Remove="node_modules\**" />
    <EmbeddedResource Remove="node_modules\**" />
    <None Remove="node_modules\**" />
  </ItemGroup>
	<ItemGroup>
		<Content Update="node_modules\**\*.*" CopyToPublishDirectory="Never" />
	</ItemGroup>
  <ItemGroup>
    <Folder Include="wwwroot\" />
  </ItemGroup>
  <ItemGroup>
    <!-- Other dependencies -->
    <PackageReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />
  </ItemGroup>
</Project>
Further technical details
Include the output of dotnet --info
dotnet --info

.NET SDK (reflecting any global.json):

Version:   6.0.102

Commit:    02d5242
Runtime Environment:

OS Name:     Windows

OS Version:  10.0.17763

OS Platform: Windows

RID:         win10-x64

Base Path:   C:\Program Files\dotnet\sdk\6.0.102\
Host (useful for support):

Version: 6.0.2

Commit:  839cdfb0ec
.NET SDKs installed:

2.1.818 [C:\Program Files\dotnet\sdk]

6.0.102 [C:\Program Files\dotnet\sdk]
.NET runtimes installed:

Microsoft.AspNetCore.All 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]

Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]

Microsoft.AspNetCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]

Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]

Microsoft.AspNetCore.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]

Microsoft.NETCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

Microsoft.NETCore.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

Microsoft.WindowsDesktop.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
To install additional .NET runtimes or SDKs:

https://aka.ms/dotnet-download
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Happy Coding!
          @chiikin 我这个项目没有用jenkins做自动化，用bat文件里面加了publish命令，每次手动点击做发布。

上午publish的时候加了 -v diag 参数排查了一下，主要下面两个target命令执行时间过长影响了发布时间
5479 毫秒 _FilterRestoreGraphProjectInputItems           1 次调用
74464 毫秒 _IncludePrePublishGeneratedContent         1 次调用
查了些资料，应该是发布时文件过多造成检查时间过长，目前通过禁用EnableDefaultContentItems的方式解决了。

需要复制到发布文件夹的内容通过Content Include加进去
PropertyGroup ->
<EnableDefaultContentItems>false</EnableDefaultContentItems>
<DefaultItemExcludes>$(DefaultItemExcludes);wwwroot/**/node_modules/**</DefaultItemExcludes>
ItemGroup ->
<Content Include="wwwroot/**" CopyToPublishDirectory="PreserveNewest" Exclude="$(DefaultItemExcludes);$(DefaultExcludesInProjectFolder)" />
如果通过jenkins命令来做全量复制的话，可以把上面的CopyToPublishDirectory设置为Never，这样省去检查的时间，会更快一些。
参考issue：#12488