如何从 TFVC 存储库中挑选到 Git 存储库？

Question

我们刚刚从 TFVC 迁移到 Git，马上就遇到了一个问题——如何挑选 TFVC 提交到 Git？

给定

• TFVC 分支$/Alice
• TFVC 分支$/Bob
• 带有$/Alice 的Git 存储库迁移为alice 分支和$/Bob - 作为bob 分支。
• TFVC 历史未迁移，因此“$/Alice”的整个 TFVC 历史只是一次 Git 提交。 $\Bob 也是如此。

问题

现在我们在 $/Alice 中发现了一个 TFVC 提交，它在迁移之前没有合并到 $/Bob。现在在迁移之后，我们意识到我们需要将它放在bob 分支中。大败笔。

我说的是一个很大的变化——很多文件。因此，手动区分文件并复制更改不是很可行。我需要尽可能地自动化这个过程。

到目前为止我做了什么

我想我应该为有问题的 TFVC 变更集创建一个补丁。所以，这里是代码（假设我需要挑选提交 123）：

$files = (tf changeset /noprompt 123 | sls '\$/') -replace '^[^$]+',''
$files |% { tf diff /version:C122~C123 /format:unified $_ } >> 123.diff

（我一个一个文件一个文件来做，因为它比使用/r标志运行tf diff要快得多）

无论如何，我得到一个像这样的补丁文件：

File: BackgroundJobTests\BackgroundJobTests.csproj
===================================================================
--- Server: BackgroundJobTests.csproj;115493
+++ Server: BackgroundJobTests.csproj;389742
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
===================================================================
File: BI\a8i\a8i.csproj
===================================================================
--- Server: a8i.csproj;342293
+++ Server: a8i.csproj;389742
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" />
...

一个典型的 Git 存储补丁看起来有点不同：

diff --git a/Yogi.txt b/Yogi.txt
index 056fd9e..1f73d44 100644
--- a/Yogi.txt
+++ b/Yogi.txt
@@ -1 +1 @@
-yaba daba do
+yaba daba doo
diff --git a/hello.txt b/hello.txt
index ce01362..980a0d5 100644
--- a/hello.txt
+++ b/hello.txt
@@ -1 +1 @@
-hello
+Hello World!

我觉得我需要一些指导。也许我做错了，有一个现成的解决方案可以解决我的痛苦。或者也许我的方向是正确的，我所需要的只是一种“欺骗”Git 接受我的补丁作为隐藏补丁的方法。但魔鬼在细节中，我缺少它们。

Answer 1

我最终得到了以下 Powershell 脚本：

param(
    [Parameter(Mandatory = $true, Position = 0)]$SrcBaseDir, 
    [Parameter(Mandatory = $true, Position = 1)]$SrcRepo,
    [Parameter(Mandatory = $true, Position = 2)]$DstBaseDir, 
    [Parameter(Mandatory = $true, Position = 3)][int]$Changeset)

[io.directory]::SetCurrentDirectory($DstBaseDir)
cd $SrcBaseDir
$files = @((tf changeset /noprompt $Changeset | sls '\$/') -replace '^[^$]+','')
Write-Host -ForegroundColor Green "Found $($files.Length) files"

cd $DstBaseDir
$GitStatus = git status --porcelain
$FailedPatches = @{}
$PatchFilePathPrefix = "$env:TEMP\$(Get-Date -Format 'yyyyMMddHHmmss')_"
$NotFound = @()
$Modified = @()
$i = 0
$files |% {
    ++$i
    $TargetFile = $_.Substring($SrcRepo.Length)
    if (!(Test-Path $TargetFile))
    {
        Write-Host -ForegroundColor Yellow "[$i] not found skipped $TargetFile"
        $NotFound += $TargetFile
    }
    elseif ($GitStatus | sls -SimpleMatch $TargetFile)
    {
        # Very important - git status returns wrong result if the case is different
        # This is why I pipe it through PowerShell Select-String command which lets me check
        # the status case insensitively
        Write-Host -ForegroundColor Yellow "[$i] already modified skipped $TargetFile"
        $Modified += $TargetFile
    }
    else 
    {
        Write-Host -ForegroundColor Green "[$i] $TargetFile"
        pushd $SrcBaseDir
        try
        {
            $patch = tf diff /version:"C$($Changeset - 1)~C$Changeset" /format:unified $_
        }
        finally
        {
            popd
        }

        $PatchFileName = "${PatchFilePathPrefix}$($TargetFile -replace '[\\/]','_').patch"
        $patch `
            -replace "^--- Server: .*","--- a/$TargetFile" `
            -replace "^\+\+\+ Server: .*","+++ b/$TargetFile" | Out-File -Encoding utf8 $PatchFileName

        $res = git apply --whitespace=nowarn $PatchFileName 2>&1
        $failed = $LASTEXITCODE
        if ($failed)
        {
            $bytes = [io.file]::ReadAllBytes($TargetFile)
            $BOMCount = 0
            while ($bytes[$BOMCount] -gt 127)
            {
                ++$BOMCount
            }
            if ($BOMCount)
            {
                $fs = [io.file]::Create($TargetFile)
                $fs.Write($bytes, $BOMCount, $bytes.Length - $BOMCount)
                $fs.Close()
                $res = git apply --whitespace=nowarn $PatchFileName 2>&1
                $failed = $LASTEXITCODE
                if ($failed)
                {
                    [io.file]::WriteAllBytes($TargetFile, $bytes)
                }
                else
                {
                    $NewBytes = [io.file]::ReadAllBytes($TargetFile)
                    $fs = [io.file]::Create($TargetFile)
                    $fs.Write($bytes, 0, $BOMCount)
                    $fs.Write($NewBytes, 0, $NewBytes.Length)
                    $fs.Close();
                }
            }
        }
        if ($failed)
        {
            $res |% {
                if ($_ -is [Management.Automation.ErrorRecord])
                {
                    $_.Exception.Message
                }
                else
                {
                    $_
                }
            } | Write-Host -ForegroundColor Red
            $FailedPatches[$TargetFile] = $PatchFileName
        }
        else 
        {
            del $PatchFileName
        }
    }
}
@{
    Failed = $FailedPatches
    NotFound = $NotFound
    AlreadyModified = $Modified
}