Bullet Proof File Handling - Directory Iteraction

Question

Hi
I have a cleanup script which I got and modified from the .net. The problem was only some files were being actioned.
I fired up powergui and tried various errorlevels, try / catch but can't beat it..
i.e if gets an error and aborts further recursion
What I want to happen is :
- all directories and files (top level and sub directory) to be deleted UNLESS the files happen to end with *.msi
- if a directory contains files AFTER deletion attempts (this will either me *.msi or files which are locked - in use) the directory is not deleted
- locked etc, access denied should not be reported and skipped over but the recursion itself should not stop
>> What do you recommend ?
Thanks
Get-ChildItem "C:\users\$env:USERNAME\AppData\Local\Temp\" -Exclude *.msi -Recurse -Force -ErrorAction Ignore | foreach {
#Write-Host "File is $_ try
remove-item -Path $_ -Exclude *.msi -Verbose -Force -recurse -ErrorAction SilentlyContinue
catch
File is C:\users\me\AppData\Local\Temp\OneNoteRuntimeCache\15.0
VERBOSE: Performing operation "Remove Directory" on Target "C:\users\me\AppData\Local\Temp\OneNoteRuntimeCache\15.0".
VERBOSE: Performing operation "Remove file" on Target "C:\users\Sme\AppData\Local\Temp\OneNoteRuntimeCache\15.0\OneNoteRuntimeCache.onecache".
Get-ChildItem : Access is denied
At D:\Projects\PowerShell\test2.ps1:3 char:4
+ Get-ChildItem "C:\users\$env:USERNAME\AppData\Local\Temp\" -Exclude *.msi -Re ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Get-ChildItem], UnauthorizedAccessException

Answer 1

The following works and gives finer control but requires more code.
The previous approach still caused the script to stop.
I have written in a general sense with comments so others can modify.
$ErrorActionPreference
=
"SilentlyContinue"
$global:LevelCount
= 0
$global:MaxLevelCount
= 0
$global:TotalFileCount
= 0
$global:TotalDirCount
= 0
$global:TotalFileSize
= 0
$DirFlag
= [int]([System.Io.FileAttributes]::Directory)
$JunctionFlag
= [int]([System.Io.FileAttributes]::ReparsePoint)
<#
.SYNOPSIS
Recurse direcory, first go through all the files then each directory
.DESCRIPTION
Recurse direcory, first go through all the files then each directory
then repeat this patterm in subdirectories, the code has a section for file and dir handling
.NOTES
 Authors:  Greg Roberts
.PARAMETER String Path
 Path to top level directory
.PARAMETER Int Recurse_Flag
 Used internally, do not add
 #>
Function
Recurse_Files{
Param(
[Parameter(Mandatory=$True)]
[string]$Path,
[Parameter(Mandatory=$False)]
[int]$Recurse_Flag
= 0
if ($Recurse_Flag
-eq 0)
# first time...
$global:TotalFileCount
= 0
$global:TotalDirCount
= 0
$global:TotalFileSize
= 0
$global:MaxLevelCount
= 0
$global:LevelCount++
if ($global:LevelCount
-gt
$global:MaxLevelCount)
$global:MaxLevelCount
=
$global:LevelCount
$Files
= 0
$Dirs
= 0
$FileSize
= 0
[int[]]
$theStats
= 0,0,0
Write-Host
"Inside "
$Path
# Exclusions can be added here (-Exclude *.msi) or in the logic below
ForEach($file
in (Get-ChildItem
$Path
-force
-ErrorAction
silentlycontinue))
try
# Do not follow reparse points, i.e. junctions
if (([int]$file.Attributes
-band
$JunctionFlag)
-eq 1)
Continue
if (([int]$file.Attributes
-band
$DirFlag)
-eq
$DirFlag)
# Directory section
# Continue down to bottom so that we do things bottom up
# By placing this Recusion call on the other side of the "work" you can drill top down
Recurse_Files
$file.FullName 1
$Dirs++
$global:TotalDirCount++
# Do File work here, NB: this will not include the original parent directory called
if ((Get-ChildItem
$file.FullName).Count
-eq 0)
Write-Host
"Deleting "
$file.FullName
remove-item
-Path
$file.FullName
-Exclude *.msi
-Verbose
-Force
-Recurse
-ErrorAction
SilentlyContinue
else
Write-Host
"NOT Deleting "
$file.FullName
else
# File section
$Files++
$global:TotalFileCount++
$global:TotalFileSize
+=
$file.Length
$FileSize
+=
$file.Length
# Do file work here
if ($file.ModifyTime
-gt $(Get-Date).AddDays(-7))
Write-Host
"Deleting "
$file.FullName
remove-item
-Path
$file.FullName
-Exclude *.msi
-Verbose
-Force
-ErrorAction
SilentlyContinue
else
Write-Host
"Not deleting because modified recently "
$file.FullName
catch
$global:LevelCount--
# When this is zero we are back to the top level if something needs to be done
Recurse_Files
"C:\users\$env:USERNAME\AppData\Local\Temp\" 
Write-Host
Write-Host
"Stats Dirs "
$global:TotalDirCount
", files "
$global:TotalFileCount