rdist(TC)

rdist -- remote file distribution client program

Syntax

rdist [ -DFn ] [ -A num ] [ -a num ] [ -d var=value ] [ -l local_logopts ]
[ -L remote_logopts ] [ -f distfile ] [ -M maxproc ] [ -m host ]
[ -o distopts ] [ -t timeout ] [ name ... ]

rdist -DFn -c name ... [login@]host[ :dest]

rdist -Server

rdist -V

Description

rdist is a program to maintain identical copies of files over multiple hosts. It preserves the owner, group, mode, and mtime of files if possible and can update programs that are executing. rdist reads commands from distfile to direct the updating of files and/or directories. If distfile is ``-'', the standard input is used. If no -f option is present, the program looks first for ``distfile'', then ``Distfile'' to use as the input. If no names are specified on the command line, rdist will update all of the files and directories listed in distfile. Otherwise, the argument is taken to be the name of a file to be updated or the label of a command to execute. If label and file names conflict, it is assumed to be a label. These may be used together to update specific files using specific commands.

The -c option forces rdist to interpret the remaining arguments as a small distfile. The equivalent distfile is as follows.

( name ... ) -> [login @ ]host
install [dest] ;

The -Server option is recognized to provide partial backward compatible support for older versions of rdist which used this option to put rdist into server mode. If rdist is started with the -Server command line option, it will attempt to exec (run) the old version of rdist. This option will only work if rdist was compiled with the location of the old rdist (usually /usr/bin/ordist) and that program is available at run time.

rdist uses the rcmd(SLIB) interface to access each target host. rdist will attempt to run the command

rdistd -S

on each target host. rdist does not specify the absolute pathname to rdistd on the target host in order to avoid imposing any policy on where rdistd must be installed on target host. Therefore, rdistd must be somewhere in the $PATH of the user running rdist on the remote (target) host.

NOTE: If the basename of a file (the last component in the pathname) is ``.'', then rdist assumes the remote (destination) name is a directory. For example: ``/tmp/.'' means that /tmp should be a directory on the remote host.

Options

-A num

set the minimum number of free files (inodes) on a filesystem that must exist for rdist to update or install a file

-a num

set the minimum amount of free space (in bytes) on a filesystem that must exist for rdist to update or install a file

-D

enable copious debugging messages

-d var=value

define var to have value. This option is used to define or override variable definitions in the distfile. value can be the empty string, one name, or a list of names surrounded by parentheses and separated by tabs and/or spaces.

-F

do not fork any child rdist processes. All clients are updated sequentially.

-f distfile

set the name of the distfile to use to be distfile. If distfile is specified as dash (-) then read from standard input (stdin).

-l logopts

set local logging options; see the section ``Message logging'' for details on the syntax for logopts.

-L logopts

set remote logging options. logopts is the same as for local logging except the values are passed to the remote server (rdistd). See the section ``Message logging" for details on the syntax for logopts.

-M num

set the maximum number of simultaneously running child rdist processes to num. The default is 4.

-m machine

limit which machines are to be updated. Multiple -m arguments can be given to limit updates to a subset of the hosts listed in the distfile.

-n

print the commands without executing them. This option is useful for debugging distfile.

-odistopts

specify the dist options to enable. distopts is a comma separated list of options which are listed below. The valid values for distopts are:

verify: verify that the files are up to date on all the hosts. Any files that are out of date will be displayed but no files will be changed nor any mail sent.
whole: whole mode. The whole file name is appended to the destination directory name. Normally, only the last component of a name is used when renaming files. This will preserve the directory structure of the files being copied instead of flattening the directory structure. For example, using rdist on a list of files such as /path/dir1/f1 and /path/dir2/f2 to /tmp/dir would create files /tmp/dir/path/dir1/f1 and /tmp/dir/path/dir2/f2 instead of /tmp/dir/dir1/f1 and /tmp/dir/dir2/f2.
noexec: automatically exclude executable files that are in a.out(FP) format from being checked or updated
younger: younger mode. Files are normally updated if their mtime and size (see stat(S)) disagree. This option causes rdist not to update files that are younger than the master copy. This can be used to prevent newer copies on other hosts from being replaced. A warning message is printed for files which are newer than the master copy.
compare: binary comparison; perform a binary comparison and update files if they differ rather than comparing dates and sizes.
follow: follow symbolic links; copy the file that the link points to rather than the link itself.
ignlnks: ignore unresolved links. rdist will normally try to maintain the link structure of files being transferred and warn the user if all the links cannot be found.
chknfs: do not check or update files on target host that reside on NFS filesystems
chkreadonly: enable check on target host to see if a file resides on a read-only filesystem. If a file does, then no checking or updating of the file is attempted.
chksym: If the target on the remote host is a symbolic link, but is not on the master host, the remote target will be left a symbolic link. This behavior is generally considered a bug in the original version of rdist, but is present to allow compatibility with older versions.
quiet: quiet mode. Files that are being modified are normally printed on standard output. This option suppresses this.
remove: remove extraneous files. If a directory is being updated, any files that exist on the remote host that do not exist in the master directory are removed. This is useful for maintaining truly identical copies of directories.
nochkowner: do not check user ownership of files that already exist. The file ownership is only set when the file is updated.
nochkgroup: do not check group ownership of files that already exist. The file ownership is only set when the file is updated.
nochkmode: do not check file and directory permission modes. The permission mode is only set when the file is updated.
nodescend: do not descend into a directory. Normally rdist will recursively check directories. If this option is enabled, then any files listed in the file list in the distfile that are directories are not recursively scanned. Only the existence, ownership, and mode of the directory are checked.
numchkgroup: use the numeric group id (gid) to check group ownership instead of the group name
numchkowner: use the numeric user id (uid) to check user ownership instead of the user name
savetargets: save files that are updated instead of removing them. Any target file that is updated is first renamed from file to file.OLD.

-t timeout

set the timeout period (in seconds) for waiting for responses from the remote rdist server. The default is 900 seconds.

-V

print version information and exit

NOTE: The following options are still recognized for backwards compatibility:

-v -N -O -q -b -r -R -s -w -y -h -i -x

Message logging

rdist uses a collection of predefined message facilities that each contain a list of message types specifying which types of messages to send to that facility. The local client (rdist) and the remote server (rdistd) each maintain their own copy of what types of messages to log to what facilities.

The -l logopts option to rdist tells rdist what logging options to use locally. The -L logopts option to rdist tells rdist what logging options to pass to the remote rdistd server.

The form of logopts should be of form

facility=types:facility=types ...

The valid facility names are:

stdout: messages to standard output
file: log to a file; to specify the file name, use the format ``file=filename=types''. For example:

file=/tmp/rdist.log=all,debug
syslog: use the syslogd(ADM) facility
notify: use the internal rdist ``notify'' facility. This facility is used in conjunction with the notify keyword in a distfile to specify what messages are mailed to the notify address.

types should be a comma separated list of message types. Each message type specified enables that message level. This is unlike the syslog(SLIB) system facility which uses an ascending order scheme. The following are the valid types:

change: things that change; this includes files that are installed or updated in some way
info: general information
notice: general info about things that change. This includes things like making directories which are needed in order to install a specific target, but which are not explicitly specified in the distfile.
nerror: normal errors that are not fatal
ferror: fatal errors
warning: warnings about errors which are not as serious as nerror type messages
debug: debugging information
all: all but debug messages

Here is a sample command line option:

-l stdout=all:syslog=change,notice:file=/tmp/rdist.log=all

This entry will set local message logging to have all but debug messages sent to standard output, change and notice messages will be sent to syslog(SLIB), and all messages will be written to the file /tmp/rdist.log.

Distfiles

The distfile contains a sequence of entries that specify the files to be copied, the destination hosts, and what operations to perform to do the updating. Each entry has one of the following formats.

variable_name = name_list
[ label: ] source_list -> destination_list command_list
[ label: ] source_list :: time_stamp_file command_list

The first format is used for defining variables. The second format is used for distributing files to other hosts. The third format is used for making lists of files that have been changed since some given date. The source_list specifies a list of files and/or directories on the local host which are to be used as the master copy for distribution. The destination_list is the list of hosts to which these files are to be copied. Each file in the source_list is added to a list of changes if the file is out of date on the host which is being updated (second format) or the file is newer than the time stamp file (third format).

Labels are optional. They are used to identify a command for partial updates.

Newlines, tabs, and blanks are only used as separators and are otherwise ignored. Comments begin with ``#'' and end with a newline.

Variables to be expanded begin with ``$'' followed by one character or a name enclosed in curly braces (see the examples at the end).

The source and destination lists have the following format:

name
or
( zero_or_more_names_separated_by_white_space )

These simple lists can be modified by using one level of set addition, subtraction, or intersection like this:

list - list
or
list + list
or
list & list

If additional modifications are needed (for example, ``all servers and client machines except for the OSF/1 machines'') then the list will have to be explicitly constructed in steps using ``temporary'' variables.

The shell meta-characters [, ], {, }, , and ? are recognized and expanded (on the local host only) in the same way as csh(C). They can be escaped with a backslash. The ``~'' character is also expanded in the same way as csh but is expanded separately on the local and destination hosts. When the -owhole option is used with a file name that begins with ``~'', everything except the home directory is appended to the destination name. File names which do not begin with ``/'' or ``~'' use the destination user's home directory as the root directory for the rest of the file name.

The command list consists of zero or more commands of the following format.

install options opt_dest_name ;
notify name_list ;
except name_list ;
except_pat pattern_list ;
special name_list string ;
cmdspecial name_list string ;

The install command is used to copy out of date files and/or directories. Each source file is copied to each host in the destination list. Directories are recursively copied in the same way. opt_dest_name is an optional parameter to rename files. If no install command appears in the command list or the destination name is not specified, the source file name is used. Directories in the path name will be created if they do not exist on the remote host. The -odistopts option as specified above under ``Options,'' has the same semantics as on the command line except they only apply to the files in the source list. The login name used on the destination host is the same as the local host unless the destination name is of the format ``login@host''.

The notify command is used to mail the list of files updated (and any errors that may have occurred) to the listed names. If no ``@'' appears in the name, the destination host is appended to the name (for example, name1@host, name2@host, ...).

The except command is used to update all of the files in the source list except for the files listed in name_list. This is usually used to copy everything in a directory except certain files.

The except_pat command is like the except command except that pattern_list is a list of regular expressions (see ed(C) for details). If one of the patterns matches some string within a file name, that file will be ignored. Note that since ``\'' is a quote character, it must be doubled to become part of the regular expression. Variables are expanded in pattern_list but not shell file pattern matching characters. To include a ``$'', it must be escaped with ``\''.

The special command is used to specify sh(C) commands that are to be executed on the remote host after the file in name_list is updated or installed. If the name_list is omitted, then the shell commands will be executed for every file updated or installed. string starts and ends with ``"'' and can cross multiple lines in distfile. Multiple commands to the shell should be separated by``;''. Commands are executed in the user's home directory on the host being updated. The special command can be used to rebuild private databases, etc after a program has been updated. The following environment variables are set for each special command:

FILE: the full pathname of the local file that was just updated
REMFILE: the full pathname of the remote file that was just updated

The cmdspecial command is similar to the special command, except it is executed only when the entire command is completed instead of after each file is updated. The list of files is placed in the environment variable $FILES. Each file name in $FILES is separated by a ``;'' (semi-colon).

If a hostname ends in a ``+'' (plus sign), then the plus is stripped off and NFS checks are disabled. This is equivalent to disabling the -ochknfs option just for this one host.

If a hostname is prefixed with an ``@'', it is taken to be the name of an NIS netgroup and expanded appropriately. This works only if NIS is enabled on the local system.

The following is a small example.

   HOSTS = ( matisse root@arpa)
   
   FILES = ( /bin /lib /usr/bin /usr/games
   	/usr/include/{*.h,{stand,sys,vax*,pascal,machine}/*.h}
   	/usr/lib /usr/man/man? /usr/ucb /usr/local/rdist )
   

   EXLIB = ( Mail.rc aliases aliases.dir aliases.pag crontab dshrc
   	sendmail.cf sendmail.fc sendmail.hf sendmail.st uucp vfont )
   

   ${FILES} -> ${HOSTS}
   	install -oremove,chknfs ;
   	except /usr/lib/${EXLIB} ;
   	except /usr/games/lib ;
   	special /usr/lib/sendmail "/usr/lib/sendmail -bz" ;
   

   srcs:
   /usr/src/bin -> arpa
   	except_pat ( \\.o\$ /SCCS\$ ) ;
   

   IMAGEN = (ips dviimp catdvi)
   

   imagen:
   /usr/local/${IMAGEN} -> arpa
   	install /usr/local/lib ;
   	notify ralph ;
   

   ${FILES} :: stamp.cory
   	notify root@cory ;

Limitations

Source files must reside on the local host where rdist is executed.

Variable expansion only works for name lists; there should be a general macro facility.

rdist aborts on files which have a negative mtime (before Jan 1, 1970).

rdist on older versions of BSD UNIX had rdist hard coded to point to usr/ucb/rdist.

Files

distfile: input command file
$TMPDIR/rdist: temporary file for update lists
TMPDIR: name of temporary directory to use. Default is /tmp.