Get-AzResourceGroup returns false positive

[florinangelescu]

Description

When using unconventional names for the resource group value (URLs), the cmdlet doesn't return anything as result.

Steps to reproduce

Resource group RG1 exists.
Resource group RG2 does not exists.

Get-AzResourceGroup -Name "RG1"

Returns the details of the resource group.

Get-AzResourceGroup -Name "RG2"

Fails and says the provided resource group does not exist.

Get-AzResourceGroup -Name "https://RG1?default"

Doesn't return anything, but it also doesn't fail.
In an automation we have, we are validating the resource group name and you can imagine this leads to false positive results (when the cmdlet doesn't fail).
Also, logically, this doesn't have any sense. It should either return the results of the resource group details or fail. How can it be that it has a 3rd option?

Environment data

Name                           Value                                                            
----                           -----                                                            
PSVersion                      5.1.19041.1151                                                   
PSEdition                      Desktop                                                          
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                          
BuildVersion                   10.0.19041.1151                                                  
CLRVersion                     4.0.30319.42000                                                  
WSManStackVersion              3.0                                                              
PSRemotingProtocolVersion      2.3                                                              
SerializationVersion           1.1.0.1  

Module versions

ModuleType Version    Name                                ExportedCommands                      
---------- -------    ----                                ----------------                      
Script     2.5.2      Az.Accounts                         {Add-AzEnvironment, Clear-AzContext...
Script     4.3.0      Az.Resources                        {Add-AzADGroupMember, Export-AzReso...
Script     0.0        cdsa.azure                          {Add-cdsaAzureNetworkSecurityGroupR...
Script     0.0        cdsa.devops                         {Copy-cdsaAzureDevOpsBaseAppModifie...
Script     1.0.0.0    ISE                                 {Get-IseSnippet, Import-IseSnippet,...
Manifest   3.1.0.0    Microsoft.PowerShell.Management     {Add-Computer, Add-Content, Checkpo...
Manifest   3.0.0.0    Microsoft.PowerShell.Security       {ConvertFrom-SecureString, ConvertT...
Manifest   3.1.0.0    Microsoft.PowerShell.Utility        {Add-Member, Add-Type, Clear-Variab...
Manifest   3.0.0.0    Microsoft.WSMan.Management          {Connect-WSMan, Disable-WSManCredSS...

Debug output

Error output

[dingmeng-xue]

It is a very popular cmdlet and should not have issue. @florinangelescu , please share the debug message of cmdlet execution. You can turn on it via $DebugPreference = "Continue"

[dingmeng-xue]

We have reproduce this issue. When the name is invalid, it goes through all resource groups and return null if no hit. It should be a bug and will be fixed.

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @armleads-azure.

Issue Details

---

Description

When using unconventional names for the resource group value (URLs), the cmdlet doesn't return anything as result.

Steps to reproduce

Resource group RG1 exists.
Resource group RG2 does not exists.

Get-AzResourceGroup -Name "RG1"

Returns the details of the resource group.

Get-AzResourceGroup -Name "RG2"

Fails and says the provided resource group does not exist.

Get-AzResourceGroup -Name "https://RG1?default"

Doesn't return anything, but it also doesn't fail.
In an automation we have, we are validating the resource group name and you can imagine this leads to false positive results (when the cmdlet doesn't fail).
Also, logically, this doesn't have any sense. It should either return the results of the resource group details or fail. How can it be that it has a 3rd option?

Environment data

Name                           Value                                                            
----                           -----                                                            
PSVersion                      5.1.19041.1151                                                   
PSEdition                      Desktop                                                          
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                          
BuildVersion                   10.0.19041.1151                                                  
CLRVersion                     4.0.30319.42000                                                  
WSManStackVersion              3.0                                                              
PSRemotingProtocolVersion      2.3                                                              
SerializationVersion           1.1.0.1  

Module versions

ModuleType Version    Name                                ExportedCommands                      
---------- -------    ----                                ----------------                      
Script     2.5.2      Az.Accounts                         {Add-AzEnvironment, Clear-AzContext...
Script     4.3.0      Az.Resources                        {Add-AzADGroupMember, Export-AzReso...
Script     0.0        cdsa.azure                          {Add-cdsaAzureNetworkSecurityGroupR...
Script     0.0        cdsa.devops                         {Copy-cdsaAzureDevOpsBaseAppModifie...
Script     1.0.0.0    ISE                                 {Get-IseSnippet, Import-IseSnippet,...
Manifest   3.1.0.0    Microsoft.PowerShell.Management     {Add-Computer, Add-Content, Checkpo...
Manifest   3.0.0.0    Microsoft.PowerShell.Security       {ConvertFrom-SecureString, ConvertT...
Manifest   3.1.0.0    Microsoft.PowerShell.Utility        {Add-Member, Add-Type, Clear-Variab...
Manifest   3.0.0.0    Microsoft.WSMan.Management          {Connect-WSMan, Disable-WSManCredSS...

Debug output

Error output

Author:	florinangelescu
Assignees:	-
Labels:	Service Attention, bug, question, ARM - Core, customer-reported
Milestone:	-

[dingmeng-xue]

According to current implementation

azure-powershell/src/Resources/ResourceManager/SdkClient/ResourceManagerSdkClient.cs

Line 883 in 5794114

if (string.IsNullOrEmpty(name) || WildcardPattern.ContainsWildcardCharacters(name))

, the parameter -Name has 2 usages. If it is just the normal string, cmdlet gets resource group by that name. If the value contains wildcard characters, it executes query and compares the return result. Get-AzResourceGroup -Name "https://RG1?default" is the second case that it triggers the query and return null because there is no matched result.