RDUP(1) 							       rdup								   RDUP(1)

NAME

       rdup - generate a file list suitable for making backups

SYNOPSIS

       rdup [-N timestamp] -[-Pcmd,opt1,...,opt7]...  [OPTION]...  FILELIST [DIR/FILE]...

DESCRIPTION

       rdup  is  a  utility  inspired  by rsync and the Plan9 way of doing backups. rdup itself does not backup anything. It only prints a list of
       files that are changed, or all files in case of a null dump.  It also handles files that are  removed,  allowing  for  correct  incremental
       backups. All paths printed are absolute. rdup uses the change time (ctime) to decide whether a file is altered.

       It works as follows, for a full dump

       1.     Crawl all directories, and print all the names found to standard output.

       2.     Write a filelist with all the names found when crawling.	Use this list to calculate the correct incremental dump.

       And for incremental dumps

       1.     Read in the filelist that was written when doing a full dump.

       2.     Touch the time stamp file.

       3.     Crawl all the directories again.

       4.     Diff 1. and 2. to get two lists; one of removed items and one of added/modified items.

       5.     Write the removed items to standard output

       6.     Write the modified/new items to standard output.

       7.     Write a new filelist.

       The  FILELIST  is  a  internal  list rdup writes to, to keep track of which files are in a backup. If you don't want this (i.e. make a full
       backup), use /dev/null here. The file /dev/null is handled specially by rdup: if detected no new file list is written.

       The DIRS/FILES can be specified multiple times. These are the directories and files you want to backup. If omitted it defaults to the  cur-
       rent directory "." .

       If  the -N timestamp option is not given, all paths found are printed. Only when a -N timestamp file is given, times can be compared and an
       incremental output can be generated.

       rdup prints a filelist to standard output.  Subsequent programs in a pipe line can be used to actually implement to backup scheme.  After a
       run a new FILELIST is written. No warning is given when FILELIST is an existing file, it just gets overwritten by rdup. New runs will print
       out only those files that have actually changed or are removed since the last run, thereby making incremental backups possible.

       Files are checked for changes by comparing the c-time (change time), if this time is NEWER than the c-time of timestamp file  the  pathname
       is  printed to standard output. When files are removed they are also printed to standard output, but they are prefixed with a '-'. See FOR-
       MAT below. The default format rdup uses is: "%p%T %b %t %u %U %g %G %l %s
%n%C"

       Note, that rdup also supports hashing of files, this makes it possible to check the local hash with the hash of the backed up file.

       All errors are written to standard error.  If the directory or file does not exist, they are skipped and a warning is emitted.

       The general idea is to be very UNIX like and create a bunch of simple programs which each do a their specific thing very  well.	With  rdup
       and a small shell script (50 lines) one can implement encrypted and compressed backups.

       As  rdup  doesn't  backup  anything,  the backup policy; what you backup, how you backup, how often and how you restore; is all left to the
       scripts and your imagination. To kick start your imagination see rdup-tr(1), rdup-up(1) and maybe rdup-backups.

OPTIONS

       -Pcommand,opt0,...,opt6
	      Filter all output through command. opt0 through opt6 are given as options to the command. Multiple -P's can be used, there  is  how-
	      ever a maximum of seven options for each command. The options are separated with commas, there must be no space in between.

	      Due to the nature of pipes in Unix, this pipeline is recreated for every file processed. Also see 'Child Processes' below.

       -F format
	      Specify a printf-style format to use. See FORMAT below.

       -N timestamp
	      use  the	c_time	of file timestamp as the timestamp to decide what to include in the incremental backup list. If timestamp does not
	      exist a full dump is performed.

       -M timestamp
	      As -N, but look at the m_time of timestamp.

       -R     Reverse the output of rdup. Tools accepting this ouput must create leading directory as they see them. This option allows  a  script
	      -- running as a normal user -- to put files in a directory which could have 0600 as its permission.

       -E file
	      The  file  named	'file'	contains a list of Perl-compatible regular expressions (PCRE), one per line, that rdup will use to exclude
	      names. A '#' at the start of the line can be used to signal a comment.  Empty lines are ignored.

	      If a directory is excluded, rdup won't descend in that directory, so all files in that directory are also excluded.

	      The directories leading up to the directory to be backed up can not be excluded. If you use a command line like:

		      rdup /dev/null /home/miekg/bin

	      The directories '/home', '/home/miekg', '/home/miekg/bin' are always printed.

	      If you want to exclude the file '/home/miekg/blaat' you need to add the following regular expression: '/home/miekg/blaat'.

	      If you want to exclude all .mozilla/cache directories of all users you can use '/home/.*/.mozilla/cache/.*'.  This  doesn't  exclude
	      the directory itself and I'm assuming that the users' home directories are found under '/home'.

	      Also note that rdup does not print directories with a trailing slash.

       -a     Restore the original access times on files and directories.

       -n     Don't honor .nobackup files. Normally if such a file is found the directory and all files containing it, are not printed to standard
	      output. Now they are.

       -r     Only print removed files; entries that start with a `-'. This option unsets -m.

       -m     Only print modified/new files; entries that start with a `+'. This option unsets -r.

       -v     Be more verbose. When used each path will also be printed to standard error.

       -s size
	      Don't output files larger than size bytes.  This can be used to limit the amount of data to  be  transferred  when  doing  a  remote
	      backup.  This option only applies to files.

       -x     Stay on the local filesystem.

       -V     Print rdup's version.

       -h     Give an overview of the options.

   Child Processes (-P flag)
       When creating output you might also want to 'pipe' the contents of each file through a number of commands, say a compression and encryption
       utility. Note that this is different than compressing the entire archive as GNU tar allows by using the -z option.  So this is  where  rdup
       comes  in.  It allows you to create a normal archive in which each file is encrypted (or compressed.  reversed or whatever). rdup does this
       by forking child processes which transform the content.

       If one of the forked children returns an exit code other than zero (0), it is assumed the whole conversion process  failed.  In	that  case
       rdup terminates.

       As  said  rdup  works  by  forking off a number of child processes (those commands named with the -P option(s)), interconnecting these with
       pipes. The current file is connected to the first child.  The output created by these child processes is captured  by  the  parent  (rdup).
       The  contents is then written to standard output in an archive format.  As a picture says more than a thousand words here is an ASCII image
       of the process:

			  +--- ...   (stdout)	 ... ----> archive
			 /
		     rdup  <--- ...   ... <----+
					       |
		 loop #files		       |
					       |
		file ---> cmd1 | cmd2 | ...| cmdN

BACKUPS

       With:
	       rm -f timestamp && rdup -N timestamp LIST DIR

       A full-dump filelist is printed to standard output. And with:

	       rdup -N timestamp LIST DIR

       An incremental dump filelist is printed. The file timestamp is used to save the exact time of rdup's run. The file LIST is used	to  calcu-
       late the correct incremental dump list, this is needed for files that are removed, or have a different type.

FORMAT

       The default format rdup uses is: "%p%T %b %t %u %U %g %G %l %s
%n%C"

       The following escape sequences are understood by rdup:

	       'p': '+' if file is new/modified, '-' if removed
	       'b': permission bits from lstat(2), octal in four digits
	       'm': the file mode bits, st_mode from lstat(2), decimal digits
	       'u': uid
	       'U': username
	       'g': gid
	       'G': groupname
	       'l': path name length
	       's': file size, but see CAVEATS
	       'n': path name
	       'N': path name, but in case of a soft- or hardlink only the link name.
	       't': time of modification (seconds from epoch)
	       'H': the SHA1 hash of the regular file, all zeros ("0") for all other types
	       'T': file type
		     - normal file, l symlink, h hardlink, d directory,
		     c character device, b block device, p named pipe
		     and s socket.
	       'C': the content of the file (none for all other types)

       To delimit the output of rdup with NULLs you can use '' in the format string.

       Any  file  content is written in a block/chunk based manner. The last block is signaled with a null block. A block start entry is ASCII and
       is formatted as follows: VVBLOCKBBBBB
 .  Where 'VV' is the version, currently at '01', then the  literal  string  'BLOCK'  and  then  the
       amount of bytes (BBBBB), typical '08192'. And then a newline.  This look like this:

	       01BLOCK08192
	       <START OF THE FIRST 8192 BYTES>01BLOCK00015
	       <ANOTHER 15 BYTES>01BLOCK00000

       A byte count of zero signals a stop block.

FILELIST

       rdup writes the (internal) FILELIST in the following format:

	      MODE DEV INODE LINK UID GID PATH_SIZE FILE_SIZE PATH

       Where MODE is the st_mode from stat(2), DEV is the dev id as returned by the stat call and INODE is the inode number - rdup needs this info
       to decide if a directory is renamed. LINK is equal to 'h' for hardlinks, 'l' for symlinks and otherwise it is '*'.  UID	and  GID  are  the
       numeric user and group id of the file. PATH_SIZE is the length of PATH. FILE_SIZE the file size.  And finally PATH is the path of the file.

       A typical example is:

	      16893 2050 32085 * 1000 1000 30 4096 /home/miekg/git/rdup/.git/logs

OUTPUT FORMAT

       The output generated by rdup is formatted like:

	       +|-TYPE BITS MTIME UID USER GID GROUP PATH_SIZE FILE_SIZE

	       PATH FILE_CONTENTS

       This makes it possible possible for a remote shell script to receive the actual file contetns and make a backup.

       For directories: the FILE_SIZE is zero and no content is printed. Thus:

	       +d 0755 1260243445 1000 miekg 1000 miekg 11 0

	       /home/miekg

       For regular files the following is a sample output:

	       +- 0644 1260243445 1000 miekg 1000 miekg 32 6

	       /home/miekg/svn/rdup/trunk/aaa/a01BLOCK00006

	       hello

	       01BLOCK00000


       Where aaa/a is a regular file containing the word 'hello
'

   CAVEATS
       Soft-  and  hardlinks  are  handled differently when using %n, if you don't like this behavior use %N.  The PATH name is generated from the
       link's name and its target. A symlink like

	       /home/bin/blaat -> /home/bin/bliep

       is printed as '/home/bin/blaat -> /home/bin/bliep'. The PATH_SIZE is modified accordingly, where ' -> ' (4  characters)	is  also  counted.
       The  FILE_SIZE is not needed for soft- or hardlinks, so it is set the length of the link's name -- the part left of the ' ->', in this case
       the length of '/home/bin/blaat'.

       If rdup encounters a hardlink it is handled in the same way, but the output type is set to 'h' instead of 'l'. A hardlink is only  detected
       if rdup finds a file with the same inode and device number as a previous one, i.e. such hardlinks must be contained in your backup.

       Again note: with '%N' only the link's name is printed. The FILE_SIZE is still set to the length of the link's name.

   Device Files
       For  devices the size field (%s) is changed to hold the major,minor number of the device. So if a major number is 8 and the minor number is
       0 (under Linux this is /dev/sda), its size will be 8,0. The numbers are only separated with a comma `,'.

   Symlinks
       You will probably think rdup will descend into the directory the symbolic link points to. This is not  what  actually  happens,	rdup  will
       print any directories leading up to the symlink and will not descend into the directory. GNU tar works the same.

EXIT CODE

       rdup  return a zero exit code on success, otherwise 1 is returned.  rdup will abort if a file can not be concatenated, if a regular expres-
       sion can not be compiled or if a signal is received.

EXAMPLES

       The next set of examples will all make a full dump -- because of the use of /dev/null. See rdup-tr(1) for more advanced examples.

   rdup (mirroring)
       Backup:
	       rdup /dev/null ~/bin | rdup-up -t /shared/backup
       Restore:
	      rdup /dev/null /shared/backup | rdup-up -t /tmp/restore
       or
	      cp -rap /shared/backup /tmp/restore

   rdup (archiving)
       Backup:
	      rdup /dev/null ~/bin > my-archive.rdup
       Restore:
	      rdup-up -t /tmp/restore < my-archive.rdup

   cpio
       Backup:
	      rdup -R -F '%N
' /dev/null ~/bin | cpio -o -Hcrc > my-archive.cpio
       Restore:
	      cpio -i -d -Hcrc < my-archive.cpio

   tar
       Backup:
	      rdup -F '%N
' /dev/null ~/bin | tar c -f my-archive.tar -T - --no-recursion
       Restore:
	      tar x -f my-archive.tar

AUTHOR

       Written by Miek Gieben.

REPORTING BUGS

       Report bugs to <miek@miek.nl>.

SEE ALSO

       http:/www.miek.nl/projects/rdup is the main site of rdup. Also see rdup-tr(1), rdup-up(1) and rdup-backups(7).

COPYRIGHT

       Copyright (C) 2005-2011 Miek Gieben. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A	PARTICULAR
       PURPOSE.

       Licensed under the GPL version 3. See the file LICENSE in the source distribution of rdup.

1.1.11								    24 Dec 2005 							   RDUP(1)