auto install powershell

Install-PowerShell.ps1

# -----------------------------------------------------------
# PowerShell 下载与安装脚本
# -----------------------------------------------------------

# 定义下载链接和目标文件名
$DownloadUrl = "https://github.com/PowerShell/PowerShell/releases/download/v7.5.4/PowerShell-7.5.4-win-x64.msi"
$FileName = "PowerShell-7.5.4-win-x64.msi"
$DownloadPath = Join-Path $env:TEMP $FileName

Write-Host "--- 1. 正在检查 PowerShell 版本 ---" -ForegroundColor Cyan

# 检查是否已安装该版本 (可选步骤，提供反馈)
$InstalledVersion = (Get-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\* | Where-Object { $_.DisplayName -like "PowerShell 7-x64" }).DisplayVersion
if ($InstalledVersion -eq "7.5.4") {
    Write-Host "PowerShell 7.5.4 已安装。脚本停止。" -ForegroundColor Green
    exit
}

Write-Host "--- 2. 正在下载文件: $FileName ---" -ForegroundColor Cyan
Write-Host "URL: $DownloadUrl"

try {
    # 使用 Invoke-WebRequest 进行下载
    # -OutFile 指定保存路径
    # -UseBasicParsing 避免在旧版PowerShell中出现警告
    Invoke-WebRequest -Uri $DownloadUrl -OutFile $DownloadPath -UseBasicParsing
    
    Write-Host "下载成功！文件保存到: $DownloadPath" -ForegroundColor Green

} catch {
    Write-Host "下载失败！请检查网络连接或URL是否正确。" -ForegroundColor Red
    Write-Host $_.Exception.Message -ForegroundColor Red
    exit 1
}

Write-Host "--- 3. 正在安装 PowerShell ---" -ForegroundColor Cyan
Write-Host "请稍候，安装程序可能需要管理员权限 UAC 提示。"

# 执行 MSI 安装程序
# /i: 安装
# /qb: 静默安装，只显示进度条和完成信息 (如果需要完全静默，请使用 /qn)
$InstallerArguments = @(
    "/i",
    "`"$DownloadPath`"",
    "/qb"
)

try {
    # 启动 msiexec.exe 进行安装
    $Process = Start-Process -FilePath msiexec.exe -ArgumentList $InstallerArguments -Wait -PassThru
    
    if ($Process.ExitCode -eq 0) {
        Write-Host "PowerShell 7.5.4 安装完成！" -ForegroundColor Green
    } else {
        Write-Host "安装失败。MSI 退出码: $($Process.ExitCode)" -ForegroundColor Red
    }

} catch {
    Write-Host "安装程序启动失败。" -ForegroundColor Red
    Write-Host $_.Exception.Message -ForegroundColor Red
    exit 1
}

Write-Host "--- 4. 清理下载文件 ---" -ForegroundColor Cyan

try {
    Remove-Item $DownloadPath -Force
    Write-Host "临时文件已清理。" -ForegroundColor Yellow
} catch {
    Write-Host "无法清理临时文件: $DownloadPath" -ForegroundColor Yellow
}

Write-Host "安装流程结束。您现在可以打开 'pwsh' 来运行新的 PowerShell 7。" -ForegroundColor Cyan
# -----------------------------------------------------------