private bool IsZipDeployment(out bool isScmRunFromPackage)
{
// Check app settings for run from package.
bool runFromPkgConfigured = Utility.IsValidZipSetting(_environment.GetEnvironmentVariable(AzureWebsiteZipDeployment)) ||
Utility.IsValidZipSetting(_environment.GetEnvironmentVariable(AzureWebsiteAltZipDeployment)) ||
Utility.IsValidZipSetting(_environment.GetEnvironmentVariable(AzureWebsiteRunFromPackage));
if (!_environment.IsLinuxConsumption())
{
isScmRunFromPackage = false;
// This check is strong enough for SKUs other than Linux Consumption.
return(runFromPkgConfigured);
}
// The following logic only applies to Linux Consumption, since currently SCM_RUN_FROM_PACKAGE is always set even if we are not using it.
if (runFromPkgConfigured)
{
isScmRunFromPackage = false;
return(true);
}
// If SCM_RUN_FROM_PACKAGE is set to a valid value and the blob exists, it's a zip deployment.
var url = _environment.GetEnvironmentVariable(ScmRunFromPackage);
if (string.IsNullOrEmpty(url))
{
LinuxContainerEventGenerator.LogEvent(message: $"{nameof(ScmRunFromPackage)} is empty.", source: nameof(ScriptApplicationHostOptionsSetup));
isScmRunFromPackage = false;
return(false);
}
if (Utility.TryCleanUrl(url, out string cleanedUrl))
{
LinuxContainerEventGenerator.LogEvent(message: $"{nameof(ScmRunFromPackage)} = {cleanedUrl}", source: nameof(ScriptApplicationHostOptionsSetup));
}
var isValidZipSetting = Utility.IsValidZipSetting(url);
LinuxContainerEventGenerator.LogEvent(message: $"{nameof(ScmRunFromPackage)} isValidZipSetting = {isValidZipSetting}", source: nameof(ScriptApplicationHostOptionsSetup));
if (!isValidZipSetting)
{
isScmRunFromPackage = false;
// Return early so we don't call storage if it isn't absolutely necessary.
return(false);
}
var blobExists = BlobExists(url);
LinuxContainerEventGenerator.LogEvent(message: $"{nameof(ScmRunFromPackage)} blobExists = {blobExists}", source: nameof(ScriptApplicationHostOptionsSetup));
bool scmRunFromPkgConfigured = isValidZipSetting && blobExists;
isScmRunFromPackage = scmRunFromPkgConfigured;
return(scmRunFromPkgConfigured);
}
public virtual bool BlobExists(string url)
{
if (string.IsNullOrEmpty(url))
{
return(false);
}
try
{
BlobClient blobClient = new BlobClient(new Uri(url));
int attempt = 0;
while (true)
{
try
{
return(blobClient.Exists());
}
catch (Exception ex) when(!ex.IsFatal())
{
LinuxContainerEventGenerator.LogEvent(message: $"Exception when checking if {nameof(ScmRunFromPackage)} blob exists", e: ex,
logLevel: LogLevel.Error, source: nameof(ScriptApplicationHostOptionsSetup));
if (++attempt > 2)
{
return(false);
}
Thread.Sleep(TimeSpan.FromSeconds(0.3));
}
}
}
catch (Exception ex)
{
LinuxContainerEventGenerator.LogEvent(message: $"Failed to check status of {nameof(ScmRunFromPackage)}", e: ex,
logLevel: LogLevel.Error, source: nameof(ScriptApplicationHostOptionsSetup));
return(false);
}
}
