NTFS: Rename-Item: does not support 255 Characters #3862
Description
On NTFS, Rename-Item just supports 254 characters (per path-segment, I guess).
If we try to rename a Direcotry with 255 characters, Rename-Item throws an Exception (even if the underlying APS probably does not :-() (Why is PowerShell doing the same tests which the underlying API is doing anyway? It would be less error-prone to just use the well tested API)
The same Problem exists in Remove-Item: it throws an exception if it has to handle 255 characters.
Steps to reproduce
PS C:\temp> New-Item -Type Directory -Path "c:\Temp\$('a' * 255)"
Directory: C:\Temp
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 25.05.2017 12:44 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
PS C:\temp> Rename-Item -Path "c:\Temp\$('a' * 255)" -NewName "c:\Temp\abc"
Rename-Item : The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.
At line:1 char:1
+ Rename-Item -Path "c:\Temp\$('a' * 255)" -NewName "c:\Temp\abc"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : WriteError: (C:\Temp\aaaaaaa...aaaaaaaaaaaaaaa:String) [Rename-Item], PathTooLongException
+ FullyQualifiedErrorId : RenameItemIOError,Microsoft.PowerShell.Commands.RenameItemCommand
PS C:\temp>Btw: 254 Characters are supported:
PS C:\temp> New-Item -Type Directory -Path "c:\Temp\$('a' * 254)"
Directory: C:\Temp
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 25.05.2017 12:46 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
PS C:\temp> Rename-Item -Path "c:\Temp\$('a' * 254)" -NewName "c:\Temp\abc"
PS C:\temp> # Rename-Item worked perfectlyExpected behavior
Because 255 Characters are supported by NTFS, PowerShell should support 255 Characters, too.
Actual behavior
PowerShell just supports 254 Characters (per path segment, I guess)
Environment data
> $PSVersionTable
Name Value
---- -----
PSVersion 5.1.14393.693
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.14393.693
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1