Public/Invoke-DockerPull.ps1
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function Invoke-DockerPull { [CmdletBinding()] param ( [Parameter(ValueFromPipelineByPropertyName = $true)] [String] $Registry = '', # Pull by name, by name + tag, by name + digest [Parameter(mandatory = $true, ParameterSetName = 'WithImageOnly', ValueFromPipelineByPropertyName = $true)] [Parameter(mandatory = $true, ParameterSetName = 'WithImageAndDigest', ValueFromPipelineByPropertyName = $true)] [Parameter(mandatory = $true, ParameterSetName = 'WithImageAndTag', ValueFromPipelineByPropertyName = $true)] [String] $ImageName, [ValidateNotNullOrEmpty()] [Parameter(mandatory = $true, ParameterSetName = 'WithImageAndTag', ValueFromPipelineByPropertyName = $true)] [String] $Tag = 'latest', [ValidateNotNullOrEmpty()] [Parameter(mandatory = $true, ParameterSetName = 'WithImageAndDigest')] [String] $Digest = '' ) if ($ImageName.Contains(':') -or $ImageName.Contains('@')) { throw [System.ArgumentException]::new('Image name cannot contain colon or at-sign.') } $postfixedRegistry = Add-Postfix -Value $Registry # Pulls by tag by default $imageToPull = "${postfixedRegistry}${ImageName}:${Tag}" # Digest cannot be used together with Tag if (-Not [String]::IsNullOrEmpty($Digest)) { $validDigest = Test-DockerDigest -Digest $Digest if (-Not $validDigest) { throw "Invalid digest provided, digest: ${Digest}" } $imageToPull = "${postfixedRegistry}${ImageName}@${Digest}" } $commandResult = Invoke-Command "docker pull ${imageToPull}" Assert-ExitCodeOk $commandResult $result = [PSCustomObject]@{ 'Result' = $commandResult 'ImageName' = $ImageName 'Tag' = $Tag 'Registry' = $postfixedRegistry 'Digest' = $Digest } return $result } |