如何以递归方式查找PowerShell中包含.hg文件夹的所有文件夹

Question

I am trying to write a script in PowerShell to backup our collection of Mercurial repositories.

I started with this:

$repos=Get-ChildItem C:\hgrepos|Where-Object { $_.PSIsContainer }

This will get the first level of folders under C:\\hgrepos, which normally would be fine, as this is where our repositories are located. However, subrepositories exist. So I need to go recursive. And most importantly, only folders containing a .hg subfolder should be listed .

Answer 1

You can use the -recurse flag in Get-ChildItem

It will be something like this:

gci c:\hgrepos -recurse -include ".hg" | %{$_.Parent}

Answer 2

I wrote this PowerShell function to backup our Mercurial repositories:

function BackupHg
{
    param($repositoryRoot, $destination)

    # The path to the Hg executable
    $hg = """C:\Python26\hg.bat"""

    # Get the list of repos
    Get-ChildItem $repositoryRoot | 
        Where { $_.psIsContainer -eq $true } |
        ForEach -Process { 
            $repo = $_.FullName 
            $folder = $_.Name

            if (Test-Path "$repo\.hg") {
                $cmdLine = "$hg clone -U $repo $destination\$folder"
                cmd /c $cmdLine
            }
            else {
                New-Item "$destination\$folder" -type directory
                BackupHg "$repositoryRoot\$folder" "$destination\$folder"
            }
        }    
}

You pass in the root folder and backup destination and it finds all folders, tests if it is a Mercurial repo (looking for a .hg directory) and clones the repo to the backup destination. If the folder is not a Mercurial repo then it does the recursion itself.

It's done like this because we use folders to organise our repos so all the code for each client is in its own folder separate from other clients.

One last point. The presence of Mercurial sub-repositories doesn't mean that you need to recurse. Unless you have a repository with a working copy, your sub-repo won't be stored in the repository and should be backed up by whatever system it is stored on. If that is the same system as the repository then it will be another repository in your repositories folder and will be backup up by the above script.

For example, we have a WebApp repository with a WebControls sub-repository for a client and the file structure is as follows:

C:\Repositories\Hg\Client\WebApp
C:\Repositories\Hg\Client\WebControls

WebControls is not stored in the WebApp folder even though it is a sub-repository of it.

Answer 3

I ended up using the script below. Thanks to Steve Kaye and manojlds for providing much needed feedback!

function BackupHg
{
    param($repositoryRoot, $destination)

    Remove-Item "$destination\*" -recurse

    # The path to the Hg executable
    $hg = """C:\Python27\Scripts\hg.bat"""

    # Get the list of repos
    Get-ChildItem $repositoryRoot -recurse | 
        Where { $_.psIsContainer -eq $true } |
        ForEach -Process { 
            $repo = $_.FullName 
            $folder = $_.FullName.Replace($repositoryRoot, $destination)


            if (Test-Path "$repo\.hg") {
                if (!(Test-Path "$folder")) {
                    New-Item "$folder" -type directory
                }
                $cmdLine = "$hg clone -U $repo $folder"
                write-host $cmdLine
                cmd /c $cmdLine
            }
        }    
}