ContainerInfo/Get-NavContainerImageLabels.ps1
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.Synopsis Get Labels for an image from the registry .Description Get the labels for an image from the registry without pulling the image This is also the best way to check whether a new version of an image is available .Parameter imageName Name of the image for which you want to get the labels .Parameter registryCredential Credentials for the registry if you are using a private registry (incl. bcinsider) .Example $created = (Get-BcContainerImageLabels -imageName myimage:mytag).created #> function Get-BcContainerImageLabels { Param ( [string] $imageName, [PSCredential] $registryCredential ) [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12 $webclient = New-Object System.Net.WebClient if ($imageName.IndexOf('/') -ge 0) { $registry = $imageName.Split("/")[0] $repository = $imageName.Substring($registry.Length+1).Split(":")[0] $tag = $imageName.Split(":")[1] if ("$tag" -eq "") { $tag = "w1" } $authorization = "" if ("$registry" -eq "mcr.microsoft.com") { # public repository - no authorization needed } elseif ($registryCredential) { $credentials = [Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes($registryCredential.UserName + ":" + [System.Runtime.InteropServices.Marshal]::PtrToStringBSTR([System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($registryCredential.Password)))) $authorization = "Basic $credentials" } elseif ("$registry" -eq "bcinsider.azurecr.io" -or "$registry" -eq "bcprivate.azurecr.io") { throw "$registry registry requires authorization. Please specify username and password for the registry in registryCredential." } else { $repository = "$registry/$repository" $registry = "registry.hub.docker.com" $token = ($webclient.DownloadString("https://auth.docker.io/token?scope=repository:$($repository):pull&service=registry.docker.io") | ConvertFrom-Json).token $authorization = "Bearer $token" } $webclient.Headers.Add('Accept', “application/vnd.docker.distribution.manifest.v1+json”) if ($authorization) { $webclient.Headers.Add("Authorization", $authorization ) } try { return (($webclient.DownloadString("https://$registry/v2/$repository/manifests/$tag") | ConvertFrom-Json).history[0].v1Compatibility | ConvertFrom-Json).container_config.Labels } catch { } } try { return (docker inspect $imageName | ConvertFrom-Json).Config.Labels } catch { } } Set-Alias -Name Get-NavContainerImageLabels -Value Get-BcContainerImageLabels Export-ModuleMember -Function Get-BcContainerImageLabels -Alias Get-NavContainerImageLabels |