web.config PowerShell 更新函式庫中,我借用 git diff 比對 web.config 修改前後變化。由於並非所有主機都會安裝 Git for Windows,我想到讓工具自帶可攜版 Git for Windows Portable 的解法,但有點美中不足,Git for Windows Portable 容量高遠 271MB:

為了簡單的異動對照功能,包進 6052 個檔案佔用近 300MB 超不划算,但 git diff 已用得順手,實在不想花時間找替代方案,於是我把腦筋動到「整理一份能跑 git diff 的最精簡版本」。

方法不難,只需要夠強的動機跟一點耐心。用 Process Monitor 觀察 Git for Windows 執行 git diff 過程讀到哪些檔案:(小技巧:Filter 條件可設定檔案路徑 (Path) 以 GitPortal 起始 + Result 等於 SUCCESS,聚焦成功讀取的檔案)

git diff 過程動用了 git.exe 跟 less.exe 兩個執行檔、一些 dll 程式庫及設定檔。Process Monitor 可將存取記錄匯出成 PML( Process Monitor 專屬格式)、XML 或 CSV,大家知道我要做什麼了吧?

沒錯,那就寫一段 PowerShell 將用到的檔案自動打包吧!

$dupCheck = @{}
Get-Content D:\GitFileLog.CSV | ConvertFrom-Csv | 
ForEach-Object {
    $srcPath = $_.Path
    if (Test-Path $srcPath -PathType Leaf) {
        $dstPath = $srcPath.Replace('X:\Github\PSLab\IisConfig\GitPortable\', 'D:\GitCompact\')
        if (!$dupCheck.ContainsKey($dstPath)) {
            $dupCheck.Add($dstPath, $true)
            [System.IO.Directory]::CreateDirectory([System.IO.Path]::GetDirectoryName($dstPath)) | Out-Null
            Copy-Item $srcPath $dstPath
        }
    }
}

精簡版共 16 個檔案合計 9.5MB,體積縮小到原來的 3.5%,實測也能順利跑完 git diff,大成功!

I want to use git diff but Git for Windows Portable take more than 270MB, so I use Process Monitor to pick required file to create a minimal version for git diff.


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