Azure Container Registry - Cleanup

acr-cleanup.ps1

# utils:
filter timestamp {"$(Get-Date -UFormat '%T') | $_"}

$acrName=''
$acrMaxImageTags=3

if ($(az acr list --query "[?name=='$acrName']" | ConvertFrom-Json).Length -gt 0) {
  
  echo "Pruning old image tags from: $acrName" | timestamp

  $repositories = az acr repository list --name $acrName --output tsv
  foreach ($repository in $repositories) {

      echo "Pruning repository $repository" | timestamp
      $tags = az acr repository show-tags --name $acrName --repository $repository --output tsv --orderby time_desc | where {$_ -ne 'latest'}

      if ($tags.length -gt $acrMaxImageTags) {
          echo "Repository tag count: $($tags.length); max tags: $acrMaxImageTags; pruning excess"
          for ($i=$acrMaxImageTags; $i -lt $tags.length; $i++) {
              $imageName = "$($repository):$($tags[$i])"
              echo "Deleting: $imageName" | timestamp
              az acr repository delete --name $acrName --image $imageName --yes --only-show-errors
          }
      }
  }
  echo "Done pruning ACR $acrName" | timestamp
}

# credits:
# https://github.com/andrew-kelleher/azurecontainerregistry-cleanup/blob/master/acr-cleanup.ps1