public static bool TryExtractDateFromFileName(string filePath, out DateTime lastModified)
{
// file name format: 2017-06-01-00-00-00
// legacy incremental backup format: 2017-06-01-00-00-00-0
var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(filePath);
var match = FileNameRegex.Match(fileNameWithoutExtension);
if (match.Success)
{
fileNameWithoutExtension = match.Value;
}
if (DateTime.TryParseExact(
fileNameWithoutExtension,
BackupTask.GetDateTimeFormat(fileNameWithoutExtension),
CultureInfo.InvariantCulture,
DateTimeStyles.None,
out lastModified) == false)
{
return(false);
}
return(true);
}
private bool UpdateFoldersToDelete(GetFoldersResult folders, DateTime now, List <string> foldersToDelete)
{
var firstDateInRetentionRange = now - _retentionPolicy.MinimumBackupAgeToKeep.Value;
foreach (var folder in folders.List)
{
CancellationToken.ThrowIfCancellationRequested();
var folderName = GetFolderName(folder);
var folderDetails = RestorePointsBase.ParseFolderName(folderName);
if (folderDetails.BackupTimeAsString == null)
{
if (Logger.IsInfoEnabled)
{
Logger.Info($"Failed to get backup date time for folder: {folder}");
}
continue;
}
if (DateTime.TryParseExact(
folderDetails.BackupTimeAsString,
BackupTask.GetDateTimeFormat(folderDetails.BackupTimeAsString),
CultureInfo.InvariantCulture,
DateTimeStyles.None,
out var backupTime) == false)
{
if (Logger.IsInfoEnabled)
{
Logger.Info($"Failed to parse backup date time for folder: {folder}");
}
continue;
}
if (now - backupTime < _retentionPolicy.MinimumBackupAgeToKeep)
{
// all backups are sorted by date
return(false);
}
if (string.Equals(folderDetails.DatabaseName, _databaseName, StringComparison.OrdinalIgnoreCase) == false)
{
continue; // a backup for a different database
}
var backupFiles = GetBackupFilesInFolder(folder, firstDateInRetentionRange);
if (backupFiles == null)
{
continue; // folder is empty
}
var hasFullBackupOrSnapshot = BackupUtils.IsFullBackupOrSnapshot(backupFiles.FirstFile);
if (hasFullBackupOrSnapshot == false)
{
continue; // no snapshot or full backup
}
if (GotFreshIncrementalBackup(backupFiles, now))
{
continue;
}
foldersToDelete.Add(folder);
}
return(true);
}