How to verify whether the share has write access? - powershell

Question

I am having share with write access. I am writing a powershell script to write a log file in that share.
I would like to check the condition whether i am having write access to this share before writing in it.
How to check for write access/Full control using powershell?
I have tried with Get-ACL cmdlet.
$Sharing= GEt-ACL "\\Myshare\foldername
If ($Sharing.IsReadOnly) { "REadonly access" , you can't write" }
It has Isreadonly property, But is there any way to ensure that the user has Fullcontrol access?

Answer 1

This does the same thing as #Christian's C# just without compiling C#.
function Test-Write {
[CmdletBinding()]
param (
[parameter()] [ValidateScript({[IO.Directory]::Exists($_.FullName)})]
[IO.DirectoryInfo] $Path
)
try {
$testPath = Join-Path $Path ([IO.Path]::GetRandomFileName())
[IO.File]::Create($testPath, 1, 'DeleteOnClose') > $null
# Or...
<# New-Item -Path $testPath -ItemType File -ErrorAction Stop > $null #>
return $true
} catch {
return $false
} finally {
Remove-Item $testPath -ErrorAction SilentlyContinue
}
}
Test-Write '\\server\share'
I'd like to look into implementing GetEffectiveRightsFromAcl in PowerShell because that will better answer the question....

Answer 2

I use this way to check if current user has write access to a path:
# add this type in powershell
add-type #"
using System;
using System.IO;
public class CheckFolderAccess {
public static string HasAccessToWrite(string path)
{
try
{
using (FileStream fs = File.Create(Path.Combine(path, "Testing.txt"), 1, FileOptions.DeleteOnClose))
{ }
return "Allowed";
}
catch (Exception e)
{
return e.Message;
}
}
}
"#
# use it in this way:
if ([checkfolderaccess]::HasAccessToWrite( "\\server\share" ) -eq "Allowed") { ..do this stuff } else { ..do this other stuff.. }
Code doesn't check ACL but just if is possible to write a file in the path, if it is possible returns string 'allowed' else return the exception's message error.

Answer 3

Here's a pretty simple function I built. It returns "Read", "Write", "ReadWrite", and "" (for no access):
function Test-Access()
{
param([String]$Path)
$guid = [System.Guid]::NewGuid()
$d = dir $Path -ea SilentlyContinue -ev result
if ($result.Count -eq 0){
$access += "Read"
}
Set-Content $Path\$guid -Value $null -ea SilentlyContinue -ev result
if ($result.Count -eq 0){
$access += "Write";
Remove-Item -Force $Path\$guid
}
$access
}