Fix bug where New-AzBatchApplicationPackage wouldn't work if allowUpdates was False

[KennethHarmon]

Description

This PR fixes #23809

Problem:

This issue was caused by a logical error in this function:

azure-powershell/src/Batch/Batch/Models/BatchClient.ApplicationPackages.cs

Lines 192 to 233 in 784c5e0

	private string GetStorageUrl(string resourceGroupName, string accountName, string applicationName, string version, out bool didCreateAppPackage)
	{
	try
	{
	// Checks to see if the package exists
	var response = BatchManagementClient.ApplicationPackage.Get(
	resourceGroupName,
	accountName,
	applicationName,
	version);
	didCreateAppPackage = false;
	return response.StorageUrl;
	}
	catch (CloudException exception)
	{
	// If the application package is not found we want to create a new application package.
	if (exception.Response.StatusCode != HttpStatusCode.NotFound)
	{
	var message = string.Format(Resources.FailedToGetApplicationPackage, applicationName, version, exception.Message);
	throw new CloudException(message, exception);
	}
	}
	try
	{
	var addResponse = BatchManagementClient.ApplicationPackage.Create(
	resourceGroupName,
	accountName,
	applicationName,
	version);
	// If Application was created we need to return a flag.
	didCreateAppPackage = true;
	return addResponse.StorageUrl;
	}
	catch (Exception exception)
	{
	var message = string.Format(Resources.FailedToAddApplicationPackage, applicationName, version, exception.Message);
	throw new NewApplicationPackageException(message, exception);
	}
	}

The flag it is outputting reflects whether or not it created a new app package in the absence of one.
However in it's caller:

azure-powershell/src/Batch/Batch/Models/BatchClient.ApplicationPackages.cs

Lines 116 to 121 in 784c5e0

	var storageUrl = GetStorageUrl(resourceGroupName, accountName, applicationName, version, out appPackageAlreadyExists);
	if (appPackageAlreadyExists)
	{
	CheckApplicationAllowsUpdates(resourceGroupName, accountName, applicationName, version);
	}

This flag is being interpreted as whether the application package already existed.
This means that if the package didn't exist, this flag would return true, causing a check on whether updates are allowed for this application, resulting in an error if allowUpdates is false.

Solution:

This fix renames the flag and changes the logic to properly reflect whether the application package already existed or not, preserving the existing logic in the caller method.

Mandatory Checklist

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[KennethHarmon]

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[NoriZC]

/azp run azure-powershell - security-tools

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Azure Pipelines successfully started running 1 pipeline(s).

[NoriZC]

Hi @KennethHarmon, for this issue, why do we update the function itself rather than the calling for the original method? Because there might be another place calling this function, your update might break other behaviors.

[KennethHarmon]

Hey @NoriZC, I considered that, but it made more sense semantically for me to return whether the package existed already rather than if one was created (I'm aware this is basically the same thing). It's a private function anyway and when I searched only had one reference (the one in this class). Could definitely change it to modify the caller if you'd prefer.

[NoriZC]

/azp run azure-powershell - security-tools

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Azure Pipelines successfully started running 1 pipeline(s).