91 lines
1.9 KiB
PowerShell
91 lines
1.9 KiB
PowerShell
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#Requires -Version 6.0
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Set-StrictMode -Version 2
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<#
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.SYNOPSIS
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Returns whether the specified command exists in the current environment.
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.DESCRIPTION
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Get-CommandExists takes a string as a parameter,
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and returns whether it exists in the current environment;
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either a function, alias, or an executable in the path.
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It's somewhat equivalent to `which`.
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.PARAMETER Name
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Specifies the name of the command which may or may not exist.
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.INPUTS
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System.String
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The name of the command.
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.OUTPUTS
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System.Boolean
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Whether the command exists.
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#>
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function Get-CommandExists
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{
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[CmdletBinding()]
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[OutputType([Boolean])]
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Param(
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[Parameter(ValueFromPipeline)]
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[String]$Name
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)
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$null -ne (Get-Command -Name $Name -ErrorAction SilentlyContinue)
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}
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<#
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.SYNOPSIS
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Downloads a file and checks its hash.
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.DESCRIPTION
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Get-RemoteFile takes a URI and a hash,
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downloads the file at that URI to OutFile,
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and checks that the hash of the downloaded file.
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It then returns a FileInfo object corresponding to the downloaded file.
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.PARAMETER OutFile
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Specifies the file path to download to.
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.PARAMETER Uri
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The URI to download from.
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.PARAMETER Sha256
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The expected SHA256 of the downloaded file.
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.INPUTS
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None
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.OUTPUTS
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System.IO.FileInfo
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The FileInfo for the downloaded file.
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#>
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function Get-RemoteFile
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{
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[CmdletBinding(PositionalBinding=$False)]
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[OutputType([System.IO.FileInfo])]
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Param(
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[Parameter(Mandatory=$True)]
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[String]$OutFile,
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[Parameter(Mandatory=$True)]
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[String]$Uri,
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[Parameter(Mandatory=$True)]
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[String]$Sha256
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)
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Invoke-WebRequest -OutFile $OutFile -Uri $Uri
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$actualHash = Get-FileHash -Algorithm SHA256 -Path $OutFile
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if ($actualHash.Hash -ne $Sha256) {
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throw @"
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Invalid hash for file $OutFile;
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expected: $Sha256
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found: $($actualHash.Hash)
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Please make sure that the hash in the powershell file is correct.
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"@
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}
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Get-Item $OutFile
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}
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