在Windows下用Scoop安装软件 // 无名空间

简介

工欲善其事，必先利其器。

使用电脑从安装软件开始，目前有多种安装软件的方式，主流方式即通过下载安装包安装所需软件，不赘述；此外，亦可通过命令行方式进行。在Windows平台上常见的命令行安装方式包括 Chocolatey 与 Scoop 等，前者出现较早，限制颇多，故本文采用后者。

Scoop 是一款 Windows 平台上基于命令行的软件包管理器，类似 macOS 与 Linux 平台上的 Homebrew ，可用于管理软件的安装、卸载、更新等，具有如下特点：

简洁：纯命令行操作，可批量管理软件，无需通过访问网页方式下载安装；
省心：自动管理依赖关系、自动设置环境变量、自动识别 32/64 位；
绿色：不污染系统环境（注册表），所有相关文件（包括已安装软件与配置文件等）均在指定路径下；
便携：便于在重装系统后或在新电脑上快速恢复或迁移已安装软件（包括部分配置信息）；
丰富：除官方仓库外，尚支持第三方自定义仓库，极大程度丰富了可管理软件的种类。

安装与卸载

前提条件

系统中必须有最新版的 PowerShell 或 Windows PowerShell 5.1 及以上版本
为允许执行安装程序，PowerShell执行策略必须是以下之一：Unrestricted,RemoteSigned 或 ByPass，一般选用RemoteSigned
- 在 PowerShell 中输入：
```
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
```
- 输入y表示同意

安装Scoop

注意：鉴于目前国内网络环境问题，若无法科学上网，可参考高级安装或迁移与维护。

默认安装

该方式集下载、安装于一体，且安装至C:\Users\<你的用户名>\scoop路径下。

以非管理员账户运行 PowerShell 并输入以下命令：
```
irm get.scoop.sh | iex
```
若遇网络问题，可加入代理选项（亦适用于下述高级安装）：
```
irm get.scoop.sh -Proxy 'http://<IP地址:端口号>' | iex
```

高级安装

该方式可将各步骤拆分完成，且可自定义安装路径、权限等。

首先下载所需安装脚本并另存为scoop-installer.ps1（文件名随意）：
注意：若因网络原因无法下载，可直接参考附录部分列出的源码。
```
irm get.scoop.sh -outfile 'scoop-installer.ps1'
```
在利用该脚本安装时按需设置安装参数，如设置普通软件与全局软件的安装路径、网络代理等信息：
```
.\scoop-installer.ps1 -ScoopDir 'D:\scoop' -ScoopGlobalDir 'D:\scoop-global' -Proxy 'http://<IP地址:端口号>'
```

测试

重新打开 PowerShell 并输入scoop命令，若出现帮助提示，则说明安装成功：

Usage: scoop <command> [<args>]

Available commands are listed below.

Type 'scoop help <command>' to get more help for a specific command.

Command    Summary
-------    -------
alias      Manage scoop aliases
bucket     Manage Scoop buckets
cache      Show or clear the download cache
...

卸载Scoop

卸载Scoop将同时卸载所有通过Scoop安装的软件与相关配置文件：
```
scoop uninstall scoop
```

基本用法

搜索、安装与卸载

在安装前，一般需确认待安装软件是否存在于远程仓库中，可在官网按关键字搜索；亦可通过search子命令，如搜索git，则会列出所有与git相关的软件：
```
scoop search git
```
在确认所需软件确实存在后，可直接通过install子命令与通过搜索列出的完整软件名安装所需软件，如安装git：
```
scoop install git
```
若需卸载，则可通过uninstall子命令与完整软件名进行：
```
scoop uninstall git
```

更新、查看与维护

若软件有新版本，可通过update子命令实现对指定已安装软件进行更新，如更新git与7zip：
```
scoop update git 7zip
```
若需批量更新全部已安装软件，可用正则表达式匹配：
```
scoop update *
```
若只更新 Scoop 本身，则无需其他参数：
```
scoop update
```
可通过checkup子命令查看可能出现的问题：
```
scoop checkup
```
可通过cleanup子命令删除旧版本软件，如清理所有旧版本软件：
```
scoop cleanup *
```
可通过cache子命令管理缓存文件夹，如清理所有缓存文件：
```
scoop cache rm *
```

扩展仓库

在 Scoop 中称bucket为软件仓库，用于存放各种软件的安装脚本信息。在默认情况下只支持main仓库，该库中仅包含少量基本的非图形界面工具软件，如git、7zip等，可通过加入其他仓库丰富软件资源：

官方仓库：由官方维护，软件质量有保障，但软件数量较少，可通过下述命令查看支持的官方仓库：
```
scoop bucket known
```
第三方仓库：任何人均可创建自己的仓库并发布，可发现许多无法在官方仓库找到的软件，但无法保证软件质量。

添加、查看与删除仓库

在添加官方仓库时，只需加入仓库名作为参数即可，如加入extras仓库：
```
scoop bucket add extras
```
若需添加第三方仓库，则需同时加入仓库名与仓库地址作为参数，如加入KarasuShin/scoop-bucket仓库（在本地命名该仓库为KarasuShin_scoop-bucket）：
```
scoop bucket add KarasuShin_scoop-bucket https://github.com/KarasuShin/scoop-bucket
```
可用list子命令查看已添加仓库：
```
scoop bucket list
```
若需删除仓库，需指定待删除仓库名，如删除KarasuShin/scoop-bucket仓库：
```
scoop bucket rm KarasuShin_scoop-bucket
```

迁移与维护

注意：若有他人已安装的 Scoop 软件，则无法通过网络安装的读者可采用该方法迁移安装。

因 Scoop 本身绿色环保，故当装或重装新系统后可通过如下简单步骤迁移已安装软件与配置文件至新平台，以便快速进入工作状态：

在已有平台上的准备工作

进入通过 Scoop 安装的应用程序路径（如D:\scoop\apps），该路径中包括所有通过 Scoop 安装的软件，依次进入每个文件夹（scoop文件夹除外）并删除其内的current快捷方式，否则在压缩时该快捷方式将变成实际文件夹，并与原始文件夹重复，造成压缩文件翻倍；
利用 Windows 自带工具压缩 Scoop 文件夹（如D:\scoop）为zip文件（如scoop.zip），以便在新系统中能顺利解压，其他压缩格式可能无法顺利解压。

在新平台上所作的工作

做好安装与卸载的前提条件小节中的准备工作；
将scoop.zip压缩包解压至指定安装路径（如D:\newscoop），并确保该路径下包含apps、buckets、persist、shims等文件夹；
修改环境变量，以让系统识别scoop命令：
- 添加新环境变量SCOOP，其值为上述解压路径（如D:\newscoop）；
- 修改环境变量PATH的值，在该值中添加新项%SCOOP%\shims；
重启 PowerShell 并用reset子命令重置所有软件快捷方式：
```
scoop reset *
```

总结

Scoop 为在 Windows 平台上安装软件提供了一种新思路，具有简洁、省心、绿色、便携、丰富等优势，值得尝试。

附录

以防因网络问题无法访问，现将scoop-installer.ps1文件内容列出如下：

# Issue Tracker: https://github.com/ScoopInstaller/Install/issues
# Unlicense License:
#
# This is free and unenAcumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
# For more information, please refer to <http://unlicense.org/>

<#
.SYNOPSIS
    Scoop installer.
.DESCRIPTION
    The installer of Scoop. For details please check the website and wiki.
.PARAMETER ScoopDir
    Specifies Scoop root path.
    If not specified, Scoop will be installed to '$env:USERPROFILE\scoop'.
.PARAMETER ScoopGlobalDir
    Specifies directory to store global apps.
    If not specified, global apps will be installed to '$env:ProgramData\scoop'.
.PARAMETER ScoopCacheDir
    Specifies cache directory.
    If not specified, caches will be downloaded to '$ScoopDir\cache'.
.PARAMETER NoProxy
    Bypass system proxy during the installation.
.PARAMETER Proxy
    Specifies proxy to use during the installation.
.PARAMETER ProxyCredential
    Specifies credential for the given prxoy.
.PARAMETER ProxyUseDefaultCredentials
    Use the credentials of the current user for the proxy server that is specified by the -Proxy parameter.
.PARAMETER RunAsAdmin
    Force to run the installer as administrator.
.LINK
    https://scoop.sh
.LINK
    https://github.com/ScoopInstaller/Scoop/wiki
#>
param(
    [String] $ScoopDir,
    [String] $ScoopGlobalDir,
    [String] $ScoopCacheDir,
    [Switch] $NoProxy,
    [Uri] $Proxy,
    [System.Management.Automation.PSCredential] $ProxyCredential,
    [Switch] $ProxyUseDefaultCredentials,
    [Switch] $RunAsAdmin
)

# Disable StrictMode in this script
Set-StrictMode -Off

function Write-InstallInfo {
    param(
        [Parameter(Mandatory = $True, Position = 0)]
        [String] $String,
        [Parameter(Mandatory = $False, Position = 1)]
        [System.ConsoleColor] $ForegroundColor = $host.UI.RawUI.ForegroundColor
    )

    $backup = $host.UI.RawUI.ForegroundColor

    if ($ForegroundColor -ne $host.UI.RawUI.ForegroundColor) {
        $host.UI.RawUI.ForegroundColor = $ForegroundColor
    }

    Write-Output "$String"

    $host.UI.RawUI.ForegroundColor = $backup
}

function Deny-Install {
    param(
        [String] $message,
        [Int] $errorCode = 1
    )

    Write-InstallInfo -String $message -ForegroundColor DarkRed
    Write-InstallInfo "Abort."

    # Don't abort if invoked with iex that would close the PS session
    if ($IS_EXECUTED_FROM_IEX) {
        break
    } else {
        exit $errorCode
    }
}

function Test-ValidateParameter {
    if ($null -eq $Proxy -and ($null -ne $ProxyCredential -or $ProxyUseDefaultCredentials)) {
        Deny-Install "Provide a valid proxy URI for the -Proxy parameter when using the -ProxyCredential or -ProxyUseDefaultCredentials."
    }

    if ($ProxyUseDefaultCredentials -and $null -ne $ProxyCredential) {
        Deny-Install "ProxyUseDefaultCredentials is conflict with ProxyCredential. Don't use the -ProxyCredential and -ProxyUseDefaultCredentials together."
    }
}

function Test-IsAdministrator {
    return ([Security.Principal.WindowsPrincipal]`
            [Security.Principal.WindowsIdentity]::GetCurrent()`
    ).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator) -and $env:USERNAME -ne 'WDAGUtilityAccount'
}

function Test-Prerequisite {
    # Scoop requires PowerShell 5 at least
    if (($PSVersionTable.PSVersion.Major) -lt 5) {
        Deny-Install "PowerShell 5 or later is required to run Scoop. Go to https://microsoft.com/powershell to get the latest version of PowerShell."
    }

    # Scoop requires TLS 1.2 SecurityProtocol, which exists in .NET Framework 4.5+
    if ([System.Enum]::GetNames([System.Net.SecurityProtocolType]) -notcontains 'Tls12') {
        Deny-Install "Scoop requires .NET Framework 4.5+ to work. Go to https://microsoft.com/net/download to get the latest version of .NET Framework."
    }

    # Ensure Robocopy.exe is accessible
    if (!([bool](Get-Command -Name 'robocopy' -ErrorAction SilentlyContinue))) {
        Deny-Install "Scoop requires 'C:\Windows\System32\Robocopy.exe' to work. Please make sure 'C:\Windows\System32' is in your PATH."
    }

    # Detect if RunAsAdministrator, there is no need to run as administrator when installing Scoop.
    if (!$RunAsAdmin -and (Test-IsAdministrator)) {
        Deny-Install "Running the installer as administrator is disabled by default, see https://github.com/ScoopInstaller/Install#for-admin for details."
    }

    # Show notification to change execution policy
    $allowedExecutionPolicy = @('Unrestricted', 'RemoteSigned', 'ByPass')
    if ((Get-ExecutionPolicy).ToString() -notin $allowedExecutionPolicy) {
        Deny-Install "PowerShell requires an execution policy in [$($allowedExecutionPolicy -join ", ")] to run Scoop. For example, to set the execution policy to 'RemoteSigned' please run 'Set-ExecutionPolicy RemoteSigned -Scope CurrentUser'."
    }

    # Test if scoop is installed, by checking if scoop command exists.
    if ([bool](Get-Command -Name 'scoop' -ErrorAction SilentlyContinue)) {
        Deny-Install "Scoop is already installed. Run 'scoop update' to get the latest version."
    }
}

function Optimize-SecurityProtocol {
    # .NET Framework 4.7+ has a default security protocol called 'SystemDefault',
    # which allows the operating system to choose the best protocol to use.
    # If SecurityProtocolType contains 'SystemDefault' (means .NET4.7+ detected)
    # and the value of SecurityProtocol is 'SystemDefault', just do nothing on SecurityProtocol,
    # 'SystemDefault' will use TLS 1.2 if the webrequest requires.
    $isNewerNetFramework = ([System.Enum]::GetNames([System.Net.SecurityProtocolType]) -contains 'SystemDefault')
    $isSystemDefault = ([System.Net.ServicePointManager]::SecurityProtocol.Equals([System.Net.SecurityProtocolType]::SystemDefault))

    # If not, change it to support TLS 1.2
    if (!($isNewerNetFramework -and $isSystemDefault)) {
        # Set to TLS 1.2 (3072), then TLS 1.1 (768), and TLS 1.0 (192). Ssl3 has been superseded,
        # https://docs.microsoft.com/en-us/dotnet/api/system.net.securityprotocoltype?view=netframework-4.5
        [System.Net.ServicePointManager]::SecurityProtocol = 3072 -bor 768 -bor 192
        Write-Verbose "SecurityProtocol has been updated to support TLS 1.2"
    }
}

function Get-Downloader {
    $downloadSession = New-Object System.Net.WebClient

    # Set proxy to null if NoProxy is specificed
    if ($NoProxy) {
        $downloadSession.Proxy = $null
    } elseif ($Proxy) {
        # Prepend protocol if not provided
        if (!$Proxy.IsAbsoluteUri) {
            $Proxy = New-Object System.Uri("http://" + $Proxy.OriginalString)
        }

        $Proxy = New-Object System.Net.WebProxy($Proxy)

        if ($null -ne $ProxyCredential) {
            $Proxy.Credentials = $ProxyCredential.GetNetworkCredential()
        } elseif ($ProxyUseDefaultCredentials) {
            $Proxy.UseDefaultCredentials = $true
        }

        $downloadSession.Proxy = $Proxy
    }

    return $downloadSession
}

function Test-isFileLocked {
    param(
        [String] $path
    )

    $file = New-Object System.IO.FileInfo $path

    if (!(Test-Path $path)) {
        return $false
    }

    try {
        $stream = $file.Open(
            [System.IO.FileMode]::Open,
            [System.IO.FileAccess]::ReadWrite,
            [System.IO.FileShare]::None
        )
        if ($stream) {
            $stream.Close()
        }
        return $false
    } catch {
        # The file is locked by a process.
        return $true
    }
}

function Expand-ZipArchive {
    param(
        [String] $path,
        [String] $to
    )

    if (!(Test-Path $path)) {
        Deny-Install "Unzip failed: can't find $path to unzip."
    }

    # Check if the zip file is locked, by antivirus software for example
    $retries = 0
    while ($retries -le 10) {
        if ($retries -eq 10) {
            Deny-Install "Unzip failed: can't unzip because a process is locking the file."
        }
        if (Test-isFileLocked $path) {
            Write-InstallInfo "Waiting for $path to be unlocked by another process... ($retries/10)"
            $retries++
            Start-Sleep -Seconds 2
        } else {
            break
        }
    }

    # Workaround to suspend Expand-Archive verbose output,
    # upstream issue: https://github.com/PowerShell/Microsoft.PowerShell.Archive/issues/98
    $oldVerbosePreference = $VerbosePreference
    $global:VerbosePreference = 'SilentlyContinue'

    # Disable progress bar to gain performance
    $oldProgressPreference = $ProgressPreference
    $global:ProgressPreference = 'SilentlyContinue'

    # PowerShell 5+: use Expand-Archive to extract zip files
    Microsoft.PowerShell.Archive\Expand-Archive -Path $path -DestinationPath $to -Force
    $global:VerbosePreference = $oldVerbosePreference
    $global:ProgressPreference = $oldProgressPreference
}

function Out-UTF8File {
    param(
        [Parameter(Mandatory = $True, Position = 0)]
        [Alias("Path")]
        [String] $FilePath,
        [Switch] $Append,
        [Switch] $NoNewLine,
        [Parameter(ValueFromPipeline = $True)]
        [PSObject] $InputObject
    )
    process {
        if ($Append) {
            [System.IO.File]::AppendAllText($FilePath, $InputObject)
        } else {
            if (!$NoNewLine) {
                # Ref: https://stackoverflow.com/questions/5596982
                # Performance Note: `WriteAllLines` throttles memory usage while
                # `WriteAllText` needs to keep the complete string in memory.
                [System.IO.File]::WriteAllLines($FilePath, $InputObject)
            } else {
                # However `WriteAllText` does not add ending newline.
                [System.IO.File]::WriteAllText($FilePath, $InputObject)
            }
        }
    }
}

function Import-ScoopShim {
    Write-InstallInfo "Creating shim..."
    # The scoop executable
    $path = "$SCOOP_APP_DIR\bin\scoop.ps1"

    if (!(Test-Path $SCOOP_SHIMS_DIR)) {
        New-Item -Type Directory $SCOOP_SHIMS_DIR | Out-Null
    }

    # The scoop shim
    $shim = "$SCOOP_SHIMS_DIR\scoop"

    # Convert to relative path
    Push-Location $SCOOP_SHIMS_DIR
    $relativePath = Resolve-Path -Relative $path
    Pop-Location
    $absolutePath = Resolve-Path $path

    # if $path points to another drive resolve-path prepends .\ which could break shims
    $ps1text = if ($relativePath -match '^(\.\\)?\w:.*$') {
        @(
            "# $absolutePath",
            "`$path = `"$path`"",
            "if (`$MyInvocation.ExpectingInput) { `$input | & `$path $arg @args } else { & `$path $arg @args }",
            "exit `$LASTEXITCODE"
        )
    } else {
        @(
            "# $absolutePath",
            "`$path = Join-Path `$PSScriptRoot `"$relativePath`"",
            "if (`$MyInvocation.ExpectingInput) { `$input | & `$path $arg @args } else { & `$path $arg @args }",
            "exit `$LASTEXITCODE"
        )
    }
    $ps1text -join "`r`n" | Out-UTF8File "$shim.ps1"

    # make ps1 accessible from cmd.exe
    @(
        "@rem $absolutePath",
        "@echo off",
        "setlocal enabledelayedexpansion",
        "set args=%*",
        ":: replace problem characters in arguments",
        "set args=%args:`"='%",
        "set args=%args:(=``(%",
        "set args=%args:)=``)%",
        "set invalid=`"='",
        "if !args! == !invalid! ( set args= )",
        "where /q pwsh.exe",
        "if %errorlevel% equ 0 (",
        "    pwsh -noprofile -ex unrestricted -file `"$absolutePath`" $arg %args%",
        ") else (",
        "    powershell -noprofile -ex unrestricted -file `"$absolutePath`" $arg %args%",
        ")"
    ) -join "`r`n" | Out-UTF8File "$shim.cmd"

    @(
        "#!/bin/sh",
        "# $absolutePath",
        "if command -v pwsh.exe > /dev/null 2>&1; then",
        "    pwsh.exe -noprofile -ex unrestricted -file `"$absolutePath`" $arg `"$@`"",
        "else",
        "    powershell.exe -noprofile -ex unrestricted -file `"$absolutePath`" $arg `"$@`"",
        "fi"
    ) -join "`n" | Out-UTF8File $shim -NoNewLine
}

function Get-Env {
    param(
        [String] $name,
        [Switch] $global
    )

    $target = if ($global) { 'Machine' } else { 'User' }
    return [Environment]::GetEnvironmentVariable($name, $target)
}

function Add-ShimsDirToPath {
    # Get $env:PATH of current user
    $userEnvPath = Get-Env 'PATH'

    if ($userEnvPath -notmatch [Regex]::Escape($SCOOP_SHIMS_DIR)) {
        $h = (Get-PSProvider 'FileSystem').Home
        if (!$h.EndsWith('\')) {
            $h += '\'
        }

        if (!($h -eq '\')) {
            $friendlyPath = "$SCOOP_SHIMS_DIR" -Replace ([Regex]::Escape($h)), "~\"
            Write-InstallInfo "Adding $friendlyPath to your path."
        } else {
            Write-InstallInfo "Adding $SCOOP_SHIMS_DIR to your path."
        }

        # For future sessions
        [System.Environment]::SetEnvironmentVariable('PATH', "$SCOOP_SHIMS_DIR;$userEnvPath", 'User')
        # For current session
        $env:PATH = "$SCOOP_SHIMS_DIR;$env:PATH"
    }
}

function Use-Config {
    if (!(Test-Path $SCOOP_CONFIG_FILE)) {
        return $null
    }

    try {
        return (Get-Content $SCOOP_CONFIG_FILE -Raw | ConvertFrom-Json -ErrorAction Stop)
    } catch {
        Deny-Install "ERROR loading $SCOOP_CONFIG_FILE`: $($_.Exception.Message)"
    }
}

function Add-Config {
    param (
        [Parameter(Mandatory = $True, Position = 0)]
        [String] $Name,
        [Parameter(Mandatory = $True, Position = 1)]
        [String] $Value
    )

    $scoopConfig = Use-Config

    if ($scoopConfig -is [System.Management.Automation.PSObject]) {
        if ($Value -eq [bool]::TrueString -or $Value -eq [bool]::FalseString) {
            $Value = [System.Convert]::ToBoolean($Value)
        }
        if ($null -eq $scoopConfig.$Name) {
            $scoopConfig | Add-Member -MemberType NoteProperty -Name $Name -Value $Value
        } else {
            $scoopConfig.$Name = $Value
        }
    } else {
        $baseDir = Split-Path -Path $SCOOP_CONFIG_FILE
        if (!(Test-Path $baseDir)) {
            New-Item -Type Directory $baseDir | Out-Null
        }

        $scoopConfig = New-Object PSObject
        $scoopConfig | Add-Member -MemberType NoteProperty -Name $Name -Value $Value
    }

    if ($null -eq $Value) {
        $scoopConfig.PSObject.Properties.Remove($Name)
    }

    ConvertTo-Json $scoopConfig | Set-Content $SCOOP_CONFIG_FILE -Encoding ASCII
    return $scoopConfig
}

function Add-DefaultConfig {
    # If user-level SCOOP env not defined, save to root_path
    if (!(Get-Env 'SCOOP')) {
        if ($SCOOP_DIR -ne "$env:USERPROFILE\scoop") {
            Write-Verbose "Adding config root_path: $SCOOP_DIR"
            Add-Config -Name 'root_path' -Value $SCOOP_DIR | Out-Null
        }
    }

    # Use system SCOOP_GLOBAL, or set system SCOOP_GLOBAL
    # with $env:SCOOP_GLOBAL if RunAsAdmin, otherwise save to global_path
    if (!(Get-Env 'SCOOP_GLOBAL' -global)) {
        if ((Test-IsAdministrator) -and $env:SCOOP_GLOBAL) {
            Write-Verbose "Setting System Environment Variable SCOOP_GLOBAL: $env:SCOOP_GLOBAL"
            [Environment]::SetEnvironmentVariable('SCOOP_GLOBAL', $env:SCOOP_GLOBAL, 'Machine')
        } else {
            if ($SCOOP_GLOBAL_DIR -ne "$env:ProgramData\scoop") {
                Write-Verbose "Adding config global_path: $SCOOP_GLOBAL_DIR"
                Add-Config -Name 'global_path' -Value $SCOOP_GLOBAL_DIR | Out-Null
            }
        }
    }

    # Use system SCOOP_CACHE, or set system SCOOP_CACHE
    # with $env:SCOOP_CACHE if RunAsAdmin, otherwise save to cache_path
    if (!(Get-Env 'SCOOP_CACHE' -global)) {
        if ((Test-IsAdministrator) -and $env:SCOOP_CACHE) {
            Write-Verbose "Setting System Environment Variable SCOOP_CACHE: $env:SCOOP_CACHE"
            [Environment]::SetEnvironmentVariable('SCOOP_CACHE', $env:SCOOP_CACHE, 'Machine')
        } else {
            if ($SCOOP_CACHE_DIR -ne "$SCOOP_DIR\cache") {
                Write-Verbose "Adding config cache_path: $SCOOP_CACHE_DIR"
                Add-Config -Name 'cache_path' -Value $SCOOP_CACHE_DIR | Out-Null
            }
        }
    }

    # save current datatime to last_update
    Add-Config -Name 'last_update' -Value ([System.DateTime]::Now.ToString('o')) | Out-Null
}

function Install-Scoop {
    Write-InstallInfo "Initializing..."
    # Validate install parameters
    Test-ValidateParameter
    # Check prerequisites
    Test-Prerequisite
    # Enable TLS 1.2
    Optimize-SecurityProtocol

    # Download scoop zip from GitHub
    Write-InstallInfo "Downloading..."
    $downloader = Get-Downloader
    # 1. download scoop
    $scoopZipfile = "$SCOOP_APP_DIR\scoop.zip"
    if (!(Test-Path $SCOOP_APP_DIR)) {
        New-Item -Type Directory $SCOOP_APP_DIR | Out-Null
    }
    Write-Verbose "Downloading $SCOOP_PACKAGE_REPO to $scoopZipfile"
    $downloader.downloadFile($SCOOP_PACKAGE_REPO, $scoopZipfile)
    # 2. download scoop main bucket
    $scoopMainZipfile = "$SCOOP_MAIN_BUCKET_DIR\scoop-main.zip"
    if (!(Test-Path $SCOOP_MAIN_BUCKET_DIR)) {
        New-Item -Type Directory $SCOOP_MAIN_BUCKET_DIR | Out-Null
    }
    Write-Verbose "Downloading $SCOOP_MAIN_BUCKET_REPO to $scoopMainZipfile"
    $downloader.downloadFile($SCOOP_MAIN_BUCKET_REPO, $scoopMainZipfile)

    # Extract files from downloaded zip
    Write-InstallInfo "Extracting..."
    # 1. extract scoop
    $scoopUnzipTempDir = "$SCOOP_APP_DIR\_tmp"
    Write-Verbose "Extracting $scoopZipfile to $scoopUnzipTempDir"
    Expand-ZipArchive $scoopZipfile $scoopUnzipTempDir
    Copy-Item "$scoopUnzipTempDir\scoop-*\*" $SCOOP_APP_DIR -Recurse -Force
    # 2. extract scoop main bucket
    $scoopMainUnzipTempDir = "$SCOOP_MAIN_BUCKET_DIR\_tmp"
    Write-Verbose "Extracting $scoopMainZipfile to $scoopMainUnzipTempDir"
    Expand-ZipArchive $scoopMainZipfile $scoopMainUnzipTempDir
    Copy-Item "$scoopMainUnzipTempDir\Main-*\*" $SCOOP_MAIN_BUCKET_DIR -Recurse -Force

    # Cleanup
    Remove-Item $scoopUnzipTempDir -Recurse -Force
    Remove-Item $scoopZipfile
    Remove-Item $scoopMainUnzipTempDir -Recurse -Force
    Remove-Item $scoopMainZipfile

    # Create the scoop shim
    Import-ScoopShim
    # Finially ensure scoop shims is in the PATH
    Add-ShimsDirToPath
    # Setup initial configuration of Scoop
    Add-DefaultConfig

    Write-InstallInfo "Scoop was installed successfully!" -ForegroundColor DarkGreen
    Write-InstallInfo "Type 'scoop help' for instructions."
}

function Write-DebugInfo {
    param($BoundArgs)

    Write-Verbose "-------- PSBoundParameters --------"
    $BoundArgs.GetEnumerator() | ForEach-Object { Write-Verbose $_ }
    Write-Verbose "-------- Environment Variables --------"
    Write-Verbose "`$env:USERPROFILE: $env:USERPROFILE"
    Write-Verbose "`$env:ProgramData: $env:ProgramData"
    Write-Verbose "`$env:SCOOP: $env:SCOOP"
    Write-Verbose "`$env:SCOOP_CACHE: $SCOOP_CACHE"
    Write-Verbose "`$env:SCOOP_GLOBAL: $env:SCOOP_GLOBAL"
    Write-Verbose "-------- Selected Variables --------"
    Write-Verbose "SCOOP_DIR: $SCOOP_DIR"
    Write-Verbose "SCOOP_CACHE_DIR: $SCOOP_CACHE_DIR"
    Write-Verbose "SCOOP_GLOBAL_DIR: $SCOOP_GLOBAL_DIR"
    Write-Verbose "SCOOP_CONFIG_HOME: $SCOOP_CONFIG_HOME"
}

# Prepare variables
$IS_EXECUTED_FROM_IEX = ($null -eq $MyInvocation.MyCommand.Path)

# Scoop root directory
$SCOOP_DIR = $ScoopDir, $env:SCOOP, "$env:USERPROFILE\scoop" | Where-Object { -not [String]::IsNullOrEmpty($_) } | Select-Object -First 1
# Scoop global apps directory
$SCOOP_GLOBAL_DIR = $ScoopGlobalDir, $env:SCOOP_GLOBAL, "$env:ProgramData\scoop" | Where-Object { -not [String]::IsNullOrEmpty($_) } | Select-Object -First 1
# Scoop cache directory
$SCOOP_CACHE_DIR = $ScoopCacheDir, $env:SCOOP_CACHE, "$SCOOP_DIR\cache" | Where-Object { -not [String]::IsNullOrEmpty($_) } | Select-Object -First 1
# Scoop shims directory
$SCOOP_SHIMS_DIR = "$SCOOP_DIR\shims"
# Scoop itself directory
$SCOOP_APP_DIR = "$SCOOP_DIR\apps\scoop\current"
# Scoop main bucket directory
$SCOOP_MAIN_BUCKET_DIR = "$SCOOP_DIR\buckets\main"
# Scoop config file location
$SCOOP_CONFIG_HOME = $env:XDG_CONFIG_HOME, "$env:USERPROFILE\.config" | Select-Object -First 1
$SCOOP_CONFIG_FILE = "$SCOOP_CONFIG_HOME\scoop\config.json"

# TODO: Use a specific version of Scoop and the main bucket
$SCOOP_PACKAGE_REPO = "https://github.com/ScoopInstaller/Scoop/archive/master.zip"
$SCOOP_MAIN_BUCKET_REPO = "https://github.com/ScoopInstaller/Main/archive/master.zip"

# Quit if anything goes wrong
$oldErrorActionPreference = $ErrorActionPreference
$ErrorActionPreference = 'Stop'

# Logging debug info
Write-DebugInfo $PSBoundParameters
# Bootstrap function
Install-Scoop

# Reset $ErrorActionPreference to original value
$ErrorActionPreference = $oldErrorActionPreference