Copies all tagged container images from one Azure Container Registry to another.

Copy-AzureContainerImages.ps1

<#
.SYNOPSIS
    Copies all the container images from one Azure Container Registry to another.
.DESCRIPTION
    The az CLI offers the ability to import one container registry image into an
    ACR instance at a time. The artifact transfer mechanism that might be used
    to bulk copy container images is in preview and is difficult to set up. This
    script offers the best of all worlds - a bulk execution of the `az import`
    command to bring all the images from one ACR into another.

    It is assumed you are authenticated and have access to perform the list
    operations on the source and import operations on the destination.
.PARAMETER Source
    The name of the container registry with the images to import into the destination.
.PARAMETER Destination
    The name of the container registry where images should go.
.EXAMPLE
    ./Copy-AzureContainerImages.ps1 `
      -Source "sourceacr" `
      -Destination "destinationacr"
#>
[CmdletBinding(SupportsShouldProcess = $False)]
Param(
    [Parameter(Mandatory = $True)]
    [ValidateNotNullOrEmpty()]
    [ValidateLength(5, 50)]
    [ValidatePattern('[a-z0-9]+')]
    [string]
    $Source,

    [Parameter(Mandatory = $True)]
    [ValidateNotNullOrEmpty()]
    [ValidateLength(5, 50)]
    [ValidatePattern('[a-z0-9]+')]
    [string]
    $Destination
)

Begin {
    Write-Verbose "Checking for az CLI."
    If ($null -eq (Get-Command "az")) {
        Throw "The az CLI was not found. Install here: https://docs.microsoft.com/en-us/cli/azure/install-azure-cli"
        Exit 1
    }
}
Process {
    Write-Progress -Activity "Copying Azure Container Registry Images" -Status "Getting images from $Source" -CurrentOperation "Retrieving repository list" -PercentComplete 1
    $SourceRepoListJson = az acr repository list -n $Source
    If ($LASTEXITCODE -ne 0) {
        Throw "Unable to read repository list from $Source."
        Exit 1
    }

    $SourceRepoList = $SourceRepoListJson | ConvertFrom-Json -NoEnumerate
    Write-Verbose "Found $($SourceRepoList.Length) repositories in $Source."
    $ImagesToImport = @()
    for($i = 1; $i -le $SourceRepoList.Length; $i++) {
        $RepositoryName = $SourceRepoList[$i - 1]
        $PercentComplete = 25 * ($i / $SourceRepoList.Length)
        Write-Progress -Activity "Copying Azure Container Registry Images" -Status "Getting image tags from $Source" -CurrentOperation "Retrieving tags for $RepositoryName" -PercentComplete $PercentComplete
        $TagListJson = az acr repository show-tags -n $Source --repository $RepositoryName --orderby time_asc
        If ($LASTEXITCODE -ne 0) {
            Throw "Unable to read repository tags for $RepositoryName from $Source."
            Exit 1
        }

        $TagList = $TagListJson | ConvertFrom-Json -NoEnumerate
        Write-Verbose "Found $($TagList.Length) tags for $RepositoryName."
        $TagList | ForEach-Object {
            $Tag = $_
            $ImagesToImport += "$RepositoryName`:$Tag"
        }
    }

    for ($i = 1; $i -le $ImagesToImport.Length; $i++) {
        $ImageName = $ImagesToImport[$i - 1]
        $PercentComplete = 25 + 75 * ($i / $ImagesToImport.Length)
        Write-Progress -Activity "Copying Azure Container Registry Images" -Status "Importing images to $Destination" -CurrentOperation "Importing $ImageName" -PercentComplete $PercentComplete
        az acr import --name $Destination --source "$Source.azurecr.io/$ImageName" --image $ImageName | Out-Null
        If ($LASTEXITCODE -ne 0) {
            Throw "Failed to import $ImageName to $Destination."
            Exit 1
        }
    }

    Write-Progress -Activity "Copying Azure Container Registry Images" -Completed
}