On Windows, FileSystemProvider's implementation of ItemExists does not work with long paths. #3891
Description
On Windows, the overridden method ItemExists in FileSystemProvider does not properly handle paths with lengths in excess of MAX_PATH (260) characters. This adversely affects several cmdlets, including Test-Path, Set-Location, and Remove-Item, as well as TAB expansion.
Steps to reproduce
PS C:\Temp\longish-directory-name> $longname = 'a' * 250
PS C:\Temp\longish-directory-name> New-Item -ItemType Directory $longname
Directory: C:\temp\longish-directory-name
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 5/30/2017 8:59 PM aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaa
PS C:\Temp\longish-directory-name> Test-Path $longname
False
PS C:\Temp\longish-directory-name> Set-Location aa<TAB>
PS C:\Temp\longish-directory-name> Set-Location $longname
Set-Location : Cannot find path 'C:\temp\longish-directory-name\aaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'
because it does not exist.
At line:1 char:1
+ Set-Location $longname
+ ~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (C:\temp\longish...aaaaaaaaaaaaa
aa:String) [Set-Location], ItemNotFoundException
+ FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.SetLo
cationCommand
PS C:\Temp\longish-directory-name> Remove-Item $longname
Remove-Item : Cannot find path 'C:\temp\longish-directory-name\aaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'
because it does not exist.
At line:1 char:1
+ Remove-Item $longname
+ ~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (C:\temp\longish...aaaaaaaaaaaaa
aa:String) [Remove-Item], ItemNotFoundException
+ FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.Remov
eItemCommand
Expected behavior
The long-named sub-directory was successfully created, so
Test-Path $longnameshould return TrueSet-Location aa<TAB>should expand to the long directory nameSet-Location $longnameshould change to the long-named sub-directory- After returning to the parent directory,
Remove-Item $longnameshould delete the directory
All of these work correctly on Unix environments.
Actual behavior
Test-Path $longnamereturns FalseSet-Location aa<TAB>does nothingSet-Location $longnamefails with cannot-find-path errorRemove-Item $longnamefails with cannot-find-path error
Environment data
> $PSVersionTable
Name Value
---- -----
PSVersion 6.0.0-beta
PSEdition Core
BuildVersion 3.0.0.0
CLRVersion
GitCommitId v6.0.0-beta.1-32-g5cc46d9bcd9627f4a62b3c4825d...
OS Microsoft Windows 10.0.14393
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0