Functions/Test-PathIsJunction.ps1
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# Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function Test-PathIsJunction { <# .SYNOPSIS Tests if a path is a junction. .DESCRIPTION The `Test-PathIsJunction` function tests if path is a junction (i.e. reparse point). If the path doesn't exist, returns `$false`. Carbon adds an `IsJunction` extension method on `DirectoryInfo` objects, which you can use instead e.g. Get-ChildItem -Path $env:Temp | Where-Object { $_.PsIsContainer -and $_.IsJunction } would return all the junctions under the current user's temporary directory. The `LiteralPath` parameter was added in Carbon 2.2.0. Use it to check paths that contain wildcard characters. .EXAMPLE Test-PathIsJunction -Path C:\I\Am\A\Junction Returns `$true`. .EXAMPLE Test-PathIsJunction -Path C:\I\Am\Not\A\Junction Returns `$false`. .EXAMPLE Get-ChildItem * | Where-Object { $_.PsIsContainer -and $_.IsJunction } Demonstrates an alternative way of testing for junctions. Uses Carbon's `IsJunction` extension method on the `DirectoryInfo` type to check if any directories under the current directory are junctions. .EXAMPLE Test-PathIsJunction -LiteralPath 'C:\PathWithWildcards[]' Demonstrates how to test if a path with wildcards is a junction. #> [CmdletBinding(DefaultParameterSetName='Path')] param( [Parameter(Mandatory=$true,ParameterSetName='Path',Position=0)] [string] # The path to check. Wildcards allowed. If using wildcards, returns `$true` if all paths that match the wildcard are junctions. Otherwise, return `$false`. $Path, [Parameter(Mandatory=$true,ParameterSetName='LiteralPath')] [string] # The literal path to check. Use this parameter to test a path that contains wildcard characters. # # This parameter was added in Carbon 2.2.0. $LiteralPath ) Set-StrictMode -Version 'Latest' Use-CallerPreference -Cmdlet $PSCmdlet -Session $ExecutionContext.SessionState if( $PSCmdlet.ParameterSetName -eq 'Path' ) { if( [Management.Automation.WildcardPattern]::ContainsWildcardCharacters($Path) ) { $junctions = Get-Item -Path $Path -Force | Where-Object { $_.PsIsContainer -and $_.IsJunction } return ($junctions -ne $null) } return Test-PathIsJunction -LiteralPath $Path } if( Test-Path -LiteralPath $LiteralPath -PathType Container ) { return (Get-Item -LiteralPath $LiteralPath -Force).IsJunction } return $false } |