public string InstallAndPurgeSnapshots()

in src/DependencyManagement/BackgroundDependencySnapshotMaintainer.cs [60:119]
44 lines of code
5 McCabe index (conditional complexity)

        public string InstallAndPurgeSnapshots(Func<PowerShell> pwshFactory, ILogger logger)
        {
            try
            {
                if (!_getShouldPerformManagedDependencyUpgrades())
                {
                    logger.Log(
                        isUserOnlyLog: false,
                        RpcLog.Types.Level.Warning,
                        PowerShellWorkerStrings.AutomaticUpgradesAreDisabled);

                    // Shutdown the timer that calls this method after the EOL date
                    if (_installAndPurgeTimer is not null)
                    {
                        _installAndPurgeTimer.Dispose();
                        _installAndPurgeTimer = null;
                    }

                    return null;
                }

                // Purge before installing a new snapshot, as we may be able to free some space.
                _purger.Purge(logger);

                if (IsAnyInstallationStartedRecently())
                {
                    return null;
                }

                var nextSnapshotPath = _storage.CreateNewSnapshotPath();

                using (var pwsh = pwshFactory())
                {
                    _installer.InstallSnapshot(
                        _dependencyManifest,
                        nextSnapshotPath,
                        pwsh,
                        // Background dependency upgrades are optional because the current
                        // worker already has a good enough snapshot, and nothing depends on
                        // the new snapshot yet, so installation failures will not affect
                        // function invocations.
                        DependencySnapshotInstallationMode.Optional,
                        logger);
                }

                // Now that a new snapshot has been installed, there is a chance an old snapshot can be purged.
                _purger.Purge(logger);

                return nextSnapshotPath;
            }
            catch (Exception e)
            {
                logger.Log(
                    isUserOnlyLog: false,
                    RpcLog.Types.Level.Warning,
                    string.Format(PowerShellWorkerStrings.DependenciesUpgradeSkippedMessage, e.Message));

                return null;
            }
        }