diff --git a/AssemblyInfo.cs b/AssemblyInfo.cs new file mode 100644 index 0000000..139667d --- /dev/null +++ b/AssemblyInfo.cs @@ -0,0 +1,24 @@ +using System.Reflection; +using System.Runtime.CompilerServices; + +// Information about this assembly is defined by the following +// attributes. +[assembly: AssemblyTitle("baco")] +[assembly: AssemblyDescription("baco (BackupCopy), backup using copy and hard links.")] +[assembly: AssemblyConfiguration("")] +[assembly: AssemblyCompany("")] +[assembly: AssemblyProduct("baco (BackupCopy)")] +[assembly: AssemblyCopyright("Copyright © Udo Liess 2006, 2007, 2008")] +[assembly: AssemblyTrademark("")] +[assembly: AssemblyCulture("")] + // The assembly version has following format : +// Major.Minor.Build.Revision +// You can specify all values by your own or you can build default build and revision +// numbers with the '*' character (the default): +[assembly: AssemblyVersion("0.112.*")] + +// The following attributes specify the key for the sign of your assembly. See the +// .NET Framework documentation for more information about signing. +// This is not required, if you don't want signing let these attributes like they're. +[assembly: AssemblyDelaySign(false)] +[assembly: AssemblyKeyFile("")] diff --git a/baco.cs b/baco.cs new file mode 100755 index 0000000..ba058c1 --- /dev/null +++ b/baco.cs @@ -0,0 +1,567 @@ +/* +* baco (BackupCopy), backup using copy and hard links. +* +* Copyright (C) 2006..2008 Udo Liess (udo.liess@gmx.net) +* +* This program is free software; you can redistribute it and/or +* modify it under the terms of the GNU General Public License +* as published by the Free Software Foundation; either version 2 +* of the License, or any later version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with this program; if not, write to the Free Software +* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +* http://www.fsf.org/licensing/licenses/gpl.txt +*/ + +using System; +using System.Collections.Generic; +using System.Text; +using System.IO; +using System.Text.RegularExpressions; +using System.Xml; +using System.Collections; +using System.Reflection; +using System.Runtime.InteropServices; +using Mono.Unix.Native; +using System.Security.AccessControl; + +namespace baco +{ + class baco + { + static int Main(string[] args) { return new baco().Run(args); } + + struct Source + { + public Source(string alias, string path, string exclude) + { + this.file = Path.GetFileName(path); + this.directory = string.IsNullOrEmpty(this.file) ? path : Path.GetDirectoryName(path); + this.alias = string.IsNullOrEmpty(alias) ? UnrootPath(directory) : UnrootPath(alias); + this.exclude = string.IsNullOrEmpty(exclude) ? null : new Regex(exclude); + } + public string alias; + public string directory; + public string file; + public Regex exclude; + } + class Reduce : IComparable + { + public Reduce(string age, string span) + { + this.age = TimeSpan.Parse(age); + this.span = TimeSpan.Parse(span); + } + public Reduce(TimeSpan age) + { + this.age = age; + } + public TimeSpan age; + public TimeSpan span; + public int CompareTo(Reduce other) + { + return age.CompareTo(other.age); + } + } + + static string UnrootPath(string path) + { + if (Path.VolumeSeparatorChar != Path.DirectorySeparatorChar) + path = path.Replace(Path.VolumeSeparatorChar, Path.DirectorySeparatorChar).Replace(Path.DirectorySeparatorChar.ToString() + Path.DirectorySeparatorChar, Path.DirectorySeparatorChar.ToString()); + if (path.StartsWith(Path.DirectorySeparatorChar.ToString())) + path = path.Substring(1); + return path; + } + + int Run(string[] args) + { + DateTime start = DateTime.UtcNow; + try + { + bool useDefaultConfig = File.Exists(defaultConfig) && new FileInfo(defaultConfig).Length > 0; + Console.WriteLine(about); + destination = Directory.GetCurrentDirectory(); + createHardLinkDelegate = Environment.OSVersion.Platform == PlatformID.Unix ? (CreateHardLinkDelegate)CreateHardLinkUnix : (CreateHardLinkDelegate)CreateHardLinkWin; + copyFileAttributesDelegate = Environment.OSVersion.Platform == PlatformID.Unix ? (CopyAttributes)CopyAttributesUnix : (CopyAttributes)CopyFileAttributesWin; + copyDirAttributesDelegate = Environment.OSVersion.Platform == PlatformID.Unix ? (CopyAttributes)CopyAttributesUnix : (CopyAttributes)CopyDirAttributesWin; + bool readXmlDestination = true; + switch (args.Length) + { + default: + if (useDefaultConfig) + CreateBackup(defaultConfig, true); + else + { + Console.WriteLine(help); + return 2; + } + break; + case 1: + if (Directory.Exists(args[0])) + CopyBackup(args[0]); + else + CreateBackup(args[0], readXmlDestination); + break; + case 2: + destination = args[1]; + readXmlDestination = false; + goto case 1; + } + } + catch (Exception e) { Log(e); } + Console.WriteLine(); + Console.WriteLine(string.Format("{0} backup(s) deleted.", deleteCount)); + Console.WriteLine(string.Format("{0} byte(s) in {1} file(s) copied.", copySize, copyCount)); + Console.WriteLine(string.Format("{0} byte(s) in {1} file(s) linked.", linkSize, linkCount)); + TimeSpan duration = DateTime.UtcNow.Subtract(start); + Console.WriteLine(string.Format("{0} byte(s) in {1} file(s) backuped in {2} ({3} bytes/s).", copySize + linkSize, copyCount + linkCount, duration, (long)((copySize + linkSize) / duration.TotalSeconds))); + if (exceptionCount == 0) + Console.WriteLine("All OK."); + else + Console.WriteLine(string.Format("{0} error(s)! See log file for details.", exceptionCount)); + return exceptionCount > 0 ? 1 : 0; + } + + void CreateBackup(string settingsFile, bool readXmlDestination) + { + List sources = new List(); + List reduces = new List(); + // read xml config + XmlDocument doc = new XmlDocument(); + doc.Load(settingsFile); + XmlNode rootNode = doc.SelectSingleNode("baco"); + foreach (XmlNode reduceNode in rootNode.SelectNodes("reduce")) + { + XmlNode ageNode = reduceNode.SelectSingleNode("age"); + XmlNode distanceNode = reduceNode.SelectSingleNode("span"); + reduces.Add(new Reduce(ageNode.InnerText, distanceNode.InnerText)); + } + XmlNode destinationNode = rootNode.SelectSingleNode("destination"); + if (readXmlDestination && destinationNode != null) + destination = destinationNode.InnerText; + foreach (XmlNode sourceNode in rootNode.SelectNodes("source")) + { + XmlNode aliasNode = sourceNode.SelectSingleNode("alias"); + XmlNode excludeNode = sourceNode.SelectSingleNode("exclude"); + sources.Add(new Source(aliasNode != null ? aliasNode.InnerText : null, sourceNode.SelectSingleNode("path").InnerText, excludeNode != null ? excludeNode.InnerText : null)); + } + // start + Console.WriteLine(); + DateTime now = DateTime.Now; + try { Directory.CreateDirectory(destination); } + catch (Exception e) { Log(e, "CreateDirectory()", destination); } + List oldBackups; + // reduce + try + { + oldBackups = OldBackups(destination); + reduces.Sort(); + string lastDir = null; + DateTime lastDateTime = default(DateTime); + foreach (string curDir in oldBackups) + { + DateTime curDateTime = DateTime.ParseExact(Path.GetFileNameWithoutExtension(curDir), dateTimeFormat, null); + bool delete = false; + int entry = reduces.BinarySearch(new Reduce(now - curDateTime)); + entry = entry < 0 ? ~entry - 1 : entry; + if (entry >= 0) + { + if (reduces[entry].span < TimeSpan.Zero) + delete = true; + else + if (lastDir != null) + if ((curDateTime - lastDateTime) < reduces[entry].span) + delete = true; + } + if (delete) + { + try + { + SetFilesNormal(curDir); + Directory.Delete(curDir, true); + Console.WriteLine("delete: {0}", curDir); + ++deleteCount; + } + catch (Exception e) { Log(e); } + } + else + { + lastDir = curDir; + lastDateTime = curDateTime; + } + } + } + catch (Exception e) { Log(e); } + // prepare backup + oldBackups = OldBackups(destination); + string referenceBase = oldBackups.Count > 0 ? oldBackups[oldBackups.Count - 1] : null; + string destinationBase = Path.Combine(destination, now.ToString(dateTimeFormat)); + if (Directory.Exists(destinationBase)) + throw new ApplicationException("There is already a backup with current time stamp: " + destinationBase); + Console.WriteLine("destination: {0}", destinationBase); + // process + foreach (Source source in sources) + try { Do(source.directory, source.file, referenceBase != null ? Path.Combine(referenceBase, source.alias) : null, Path.Combine(destinationBase, source.alias), source.exclude); } + catch (Exception e) { Log(e); } + } + + void SetFilesNormal(string path) + { + foreach (string dirName in Directory.GetDirectories(path)) + SetFilesNormal(dirName); + foreach (string fileName in Directory.GetFiles(path)) + File.SetAttributes(fileName, FileAttributes.Normal); + } + + void CopyBackup(string oldDestination) + { + List alreadyCopiedBakups = OldBackups(destination); + string referenceBase = alreadyCopiedBakups.Count > 0 ? alreadyCopiedBakups[alreadyCopiedBakups.Count - 1] : null; + Directory.CreateDirectory(destination); + foreach (string oldBackup in OldBackups(oldDestination)) + { + try + { + string destinationSubdir = Path.Combine(destination, Path.GetFileName(oldBackup)); + Do(oldBackup, null, referenceBase, destinationSubdir, null); + referenceBase = destinationSubdir; + } + catch (Exception e) { Log(e); } + } + } + + List OldBackups(string path) + { + string[] dirsAll = Directory.GetDirectories(path, "??????_????"); + List dirsFiltered = new List(); + Regex filter = new Regex("^[0-9]{2}[01][0-9][0-3][0-9]_[0-2][0-9][0-5][0-9]$"); + foreach (string dir in dirsAll) + if (filter.IsMatch(Path.GetFileName(dir))) + dirsFiltered.Add(dir); + dirsFiltered.Sort(); + return dirsFiltered; + } + + void Do(string sourceDir, string sourceSearchPattern, string referenceDir, string destinationDir, Regex exclude) + { + try + { + if (!Skip(Path.Combine(sourceDir, " ").TrimEnd(), exclude)) + { + try { Directory.CreateDirectory(destinationDir); } + catch (Exception e) { Log(e, "CreateDirectory()", destinationDir); } + DirectoryInfo di = new DirectoryInfo(sourceDir); + FileSystemInfo[] infos = string.IsNullOrEmpty(sourceSearchPattern) ? di.GetFileSystemInfos() : di.GetFileSystemInfos(sourceSearchPattern); + foreach (FileSystemInfo info in infos) + try + { + string subReference = referenceDir != null ? Path.Combine(referenceDir, info.Name) : null; + string subDestination = Path.Combine(destinationDir, info.Name); + if ((info.Attributes & FileAttributes.Directory) != 0) + { + if (Path.GetFullPath(sourceDir) != Path.GetFullPath(destination)) + Do(info.FullName, null, subReference, subDestination, exclude); + } + else + if (!Skip(info.FullName, exclude)) + LinkOrCopy(info.FullName, subReference, subDestination); + } + catch (Exception e) { Log(e); } + copyDirAttributesDelegate(sourceDir, destinationDir); + } + } + catch (Exception e) { Log(e); } + } + + bool Skip(string name, Regex exclude) + { + return exclude != null ? exclude.IsMatch(name) : false; + } + + void LinkOrCopy(string sourceFile, string referenceFile, string destinationFile) + { + bool done = false; + if (FileExists(referenceFile)) + if (FilesEqualBinary(sourceFile, referenceFile)) + if (createHardLinkDelegate(referenceFile, destinationFile)) + { + Console.WriteLine("link: {0}", sourceFile); + ++linkCount; + linkSize += new FileInfo(sourceFile).Length; + done = true; + } + if (!done) + { + CopyContent(sourceFile, destinationFile); + Console.WriteLine("copy: {0}", sourceFile); + ++copyCount; + copySize += new FileInfo(sourceFile).Length; + } + copyFileAttributesDelegate(sourceFile, destinationFile); + } + + void CopyContent(string source, string destination) // File.Copy() does not decrypt NTFS-encrypted files + { + try + { + byte[] bufferRead = new byte[bufferSize]; + byte[] bufferWrite = new byte[bufferSize]; + int len = 0; + using (Stream streamSource = File.OpenRead(source), + streamDestination = File.OpenWrite(destination)) + { + do + { + IAsyncResult resultWrite = streamDestination.BeginWrite(bufferWrite, 0, len, null, null); + IAsyncResult resultRead = streamSource.BeginRead(bufferRead, 0, bufferSize, null, null); + streamDestination.EndWrite(resultWrite); + len = streamSource.EndRead(resultRead); + byte[] bufferTemp = bufferWrite; + bufferWrite = bufferRead; + bufferRead = bufferTemp; + } while (len != 0); + } + } + catch (Exception e) { Log(e, "CopyContent()", source, destination); } + } + + bool FileExists(string file) + { + try { return File.Exists(file); } + catch (Exception e) { Log(e, "File.Exists()", file); } + return false; + } + + bool FilesEqualBinary(string fileA, string fileB) + { + try + { + if (new FileInfo(fileA).Length != new FileInfo(fileB).Length) + return false; + byte[] bufferReadA = new byte[bufferSize]; + byte[] bufferReadB = new byte[bufferSize]; + byte[] bufferCompA = new byte[bufferSize]; + byte[] bufferCompB = new byte[bufferSize]; + int len = 0; + using (Stream streamA = File.OpenRead(fileA), + streamB = File.OpenRead(fileB)) + { + do + { + IAsyncResult resultA = streamA.BeginRead(bufferReadA, 0, bufferSize, null, null); + IAsyncResult resultB = streamB.BeginRead(bufferReadB, 0, bufferSize, null, null); + for (int i = 0; i < len; ++i) + if (bufferCompA[i] != bufferCompB[i]) + return false; + len = streamA.EndRead(resultA); + if (streamB.EndRead(resultB) != len) + return false; + byte[] bufferTemp = bufferCompA; + bufferCompA = bufferReadA; + bufferReadA = bufferTemp; + bufferTemp = bufferCompB; + bufferCompB = bufferReadB; + bufferReadB = bufferTemp; + } while (len != 0); + } + return true; + } + catch (Exception e) { Log(e, "FilesEqualBinary()", fileA, fileB); } + return false; + } + + void Log(Exception e, params string[] texts) + { + ++exceptionCount; + StringBuilder sb = new StringBuilder(e.Message); + foreach (string text in texts) + { + sb.Append(" "); + sb.Append(text); + } + Console.Write("exception: "); + Console.WriteLine(sb); + try + { + Directory.CreateDirectory(destination); + TextWriter tw = new StreamWriter(Path.Combine(destination, "baco.log"), true); + tw.Write(DateTime.Now.ToString(@"yyyy-MM-dd HH:mm:ss ")); + tw.WriteLine(sb); + tw.Close(); + } + catch { } + } + + [DllImport("kernel32")] + static extern bool CreateHardLink(string lpFileName, string lpExistingFileName, IntPtr lpSecurityAttributes); + + bool CreateHardLinkWin(string existingFile, string newFile) + { + try { return CreateHardLink(newFile, existingFile, IntPtr.Zero); } + catch (Exception e) { Log(e, "CreateHardLinkWin()", existingFile, newFile); } + return false; + } + + bool CreateHardLinkUnix(string existingFile, string newFile) + { + try { return Syscall.link(existingFile, newFile) == 0; } + catch (Exception e) { Log(e, "CreateHardLinkUnix()", existingFile, newFile); } + return false; + } + + void CopyFileAttributesWin(string source, string destination) + { + try + { + FileAttributes sourceAttributes = File.GetAttributes(source) & fileAttributesMask; + DateTime sourceCreationTimeUtc = File.GetCreationTimeUtc(source); + DateTime sourceLastWriteTimeUtc = File.GetLastWriteTimeUtc(source); + DateTime sourceLastAccessTimeUtc = File.GetLastAccessTimeUtc(source); + if ((File.GetAttributes(destination) & fileAttributesMask) != sourceAttributes + || File.GetCreationTimeUtc(destination) != sourceCreationTimeUtc + || File.GetLastWriteTimeUtc(destination) != sourceLastWriteTimeUtc + || File.GetLastAccessTimeUtc(destination) != sourceLastAccessTimeUtc) + { + File.SetAttributes(destination, FileAttributes.Normal); + File.SetCreationTimeUtc(destination, sourceCreationTimeUtc); + File.SetLastWriteTimeUtc(destination, sourceLastWriteTimeUtc); + File.SetLastAccessTimeUtc(destination, sourceLastAccessTimeUtc); + File.SetAttributes(destination, sourceAttributes); + } + } + catch (Exception e) { Log(e, "CopyFileAttributesWin()", source, destination); } + } + + void CopyDirAttributesWin(string source, string destination) + { + try + { + Directory.SetAccessControl(destination, Directory.GetAccessControl(source)); + Directory.SetCreationTimeUtc(destination, Directory.GetCreationTimeUtc(source)); + Directory.SetLastWriteTimeUtc(destination, Directory.GetLastWriteTimeUtc(source)); + Directory.SetLastAccessTimeUtc(destination, Directory.GetLastAccessTimeUtc(source)); + } + catch (Exception e) { Log(e, "CopyDirAttributesWin()", source, destination); } + } + + void CopyAttributesUnix(string source, string destination) + { + try + { + Stat sourceStat; + Syscall.stat(source, out sourceStat); + Stat destinationStat; + Syscall.stat(destination, out destinationStat); + if (destinationStat.st_atime != sourceStat.st_atime + || destinationStat.st_mtime != sourceStat.st_mtime + || destinationStat.st_mode != sourceStat.st_mode + || destinationStat.st_uid != sourceStat.st_uid + || destinationStat.st_gid != sourceStat.st_gid) + { + Utimbuf utimbuf = new Utimbuf(); + utimbuf.actime = sourceStat.st_atime; + utimbuf.modtime = sourceStat.st_mtime; + Syscall.utime(destination, ref utimbuf); + Syscall.chmod(destination, sourceStat.st_mode); + Syscall.chown(destination, sourceStat.st_uid, sourceStat.st_gid); + } + } + catch (Exception e) { Log(e, "CopyAttributesUnix()", source, destination); } + } + + delegate bool CreateHardLinkDelegate(string existingFile, string newFile); + delegate void CopyAttributes(string source, string destination); + CreateHardLinkDelegate createHardLinkDelegate; + CopyAttributes copyFileAttributesDelegate; + CopyAttributes copyDirAttributesDelegate; + const FileAttributes fileAttributesMask = FileAttributes.Archive | FileAttributes.ReadOnly | FileAttributes.Hidden | FileAttributes.System; + string destination = ""; + long deleteCount = 0; + long copyCount = 0; + long linkCount = 0; + long exceptionCount = 0; + long copySize = 0; + long linkSize = 0; + const string dateTimeFormat = "yyMMdd_HHmm"; + const string defaultConfig = "baco.xml"; + const int bufferSize = 0x10000; + + readonly string about = @" +baco (BackupCopy), backup using copy and hard links, version " + AssemblyName.GetAssemblyName(Assembly.GetCallingAssembly().Location).Version.ToString() + @" +Runs with Mono and .NET 2.0, under Linux/Unix and Windows. +Copyright (C) 2006...2008 Udo Liess, Dresden, Germany (udo.liess@gmx.net) +www.udol.de/baco + +This program comes with ABSOLUTELY NO WARRANTY. +This program is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free Software +Foundation; either version 2 of the License, or any later version. +"; + + const string help = @" +usage to show this help (there must not be a file ""baco.xml"" in current directory): baco.exe +usage to backup: baco.exe settings-file [destination] +usage to backup with settings in file ""baco.xml"": baco.exe +usage to copy old backups with hardlinks: baco.exe old-destination [new-destination] + +priority of destination settings: command line parameter > settings file > current directory + +settings-file: + Source pathes are + files (full qualified), + folders (ending with / or \) or + groups of files (with wildcards). + To exclude files or folders use one regular expression string per source. + See .NET help: ""Regular Expression Language Elements"" or . + Use alias if the resulting destination path is too long. (The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.) + In order to delete some old backups you can setup several reducing levels. + age: Age of backup as time span. Examples: ""3"" = 3 days, ""1.12:00"" = 1.5 days, ""2:30"" = 2.5 hours + span: Minimal time span between backups. Special values: ""0"" = disables deleting for this age, ""-1"" = negative span means that all backups of this age will be deleted + Destination in XML file is optional. It will be overwritten by optional second command line parameter. + +example: + + + + d:\Documents\*.jpg + + + c:\Program Files\ + (?i)\.tmp$|\.temp$ + + + c:\very long path would be too long in destination - so use a shorter alias\ + short\path + + + 1 + 1:00 + + + 7 + 12:00 + + + 30 + 1 + + + 365 + 7 + + + 730 + 30 + + c:\BackupDestination\ + +"; + + } +} diff --git a/baco.mdp b/baco.mdp new file mode 100644 index 0000000..241f6e8 --- /dev/null +++ b/baco.mdp @@ -0,0 +1,25 @@ + + + + + + + + + + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/baco.mds b/baco.mds new file mode 100644 index 0000000..90f3bde --- /dev/null +++ b/baco.mds @@ -0,0 +1,16 @@ + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/gpl.txt b/gpl.txt new file mode 100644 index 0000000..d511905 --- /dev/null +++ b/gpl.txt @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Lesser General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. 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However, as a +special exception, the source code distributed need not include +anything that is normally distributed (in either source or binary +form) with the major components (compiler, kernel, and so on) of the +operating system on which the executable runs, unless that component +itself accompanies the executable. + +If distribution of executable or object code is made by offering +access to copy from a designated place, then offering equivalent +access to copy the source code from the same place counts as +distribution of the source code, even though third parties are not +compelled to copy the source along with the object code. + + 4. You may not copy, modify, sublicense, or distribute the Program +except as expressly provided under this License. Any attempt +otherwise to copy, modify, sublicense or distribute the Program is +void, and will automatically terminate your rights under this License. +However, parties who have received copies, or rights, from you under +this License will not have their licenses terminated so long as such +parties remain in full compliance. + + 5. You are not required to accept this License, since you have not +signed it. However, nothing else grants you permission to modify or +distribute the Program or its derivative works. These actions are +prohibited by law if you do not accept this License. Therefore, by +modifying or distributing the Program (or any work based on the +Program), you indicate your acceptance of this License to do so, and +all its terms and conditions for copying, distributing or modifying +the Program or works based on it. + + 6. Each time you redistribute the Program (or any work based on the +Program), the recipient automatically receives a license from the +original licensor to copy, distribute or modify the Program subject to +these terms and conditions. You may not impose any further +restrictions on the recipients' exercise of the rights granted herein. +You are not responsible for enforcing compliance by third parties to +this License. + + 7. If, as a consequence of a court judgment or allegation of patent +infringement or for any other reason (not limited to patent issues), +conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot +distribute so as to satisfy simultaneously your obligations under this +License and any other pertinent obligations, then as a consequence you +may not distribute the Program at all. For example, if a patent +license would not permit royalty-free redistribution of the Program by +all those who receive copies directly or indirectly through you, then +the only way you could satisfy both it and this License would be to +refrain entirely from distribution of the Program. + +If any portion of this section is held invalid or unenforceable under +any particular circumstance, the balance of the section is intended to +apply and the section as a whole is intended to apply in other +circumstances. + +It is not the purpose of this section to induce you to infringe any +patents or other property right claims or to contest validity of any +such claims; this section has the sole purpose of protecting the +integrity of the free software distribution system, which is +implemented by public license practices. Many people have made +generous contributions to the wide range of software distributed +through that system in reliance on consistent application of that +system; it is up to the author/donor to decide if he or she is willing +to distribute software through any other system and a licensee cannot +impose that choice. + +This section is intended to make thoroughly clear what is believed to +be a consequence of the rest of this License. + + 8. If the distribution and/or use of the Program is restricted in +certain countries either by patents or by copyrighted interfaces, the +original copyright holder who places the Program under this License +may add an explicit geographical distribution limitation excluding +those countries, so that distribution is permitted only in or among +countries not thus excluded. In such case, this License incorporates +the limitation as if written in the body of this License. + + 9. The Free Software Foundation may publish revised and/or new versions +of the General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies a version number of this License which applies to it and "any +later version", you have the option of following the terms and conditions +either of that version or of any later version published by the Free +Software Foundation. If the Program does not specify a version number of +this License, you may choose any version ever published by the Free Software +Foundation. + + 10. If you wish to incorporate parts of the Program into other free +programs whose distribution conditions are different, write to the author +to ask for permission. For software which is copyrighted by the Free +Software Foundation, write to the Free Software Foundation; we sometimes +make exceptions for this. Our decision will be guided by the two goals +of preserving the free status of all derivatives of our free software and +of promoting the sharing and reuse of software generally. + + NO WARRANTY + + 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY +FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN +OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES +PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED +OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS +TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE +PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, +REPAIR OR CORRECTION. + + 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License.