NAME¶

rdist - remote file distribution client program

SYNOPSIS¶

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 ] [ -p <rdistd-path> ] [ -P <transport-path> ] [ 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 either /usr/ucb/oldrdist or /usr/old/rdist) and that program is available at run time.

Rdist can use either the rcmd(3) function call or run an arbitrary transport program such as rsh(1c) to access each target host. The method used is selected at compile-time. However, if the later method is used, the transport program can be specified at run-time on the command line with the default being rsh(1c). If the rsh(1c) method is used and the target host is the string localhost and the remote user name is the same as the local user name, rdist will run the command

/bin/sh -c rdistd -S

rsh host -l remuser rdistd -S

where host is the name of the target host, remuser is the name of the user to make the connection as and, rdistd is the rdist server command on the target host as shown below. To use a transport program other than rsh(1c) use the -P option. Whatever transport program is used, must be compatible with the above specified syntax for rsh(1c). If the transport program is not, it should be wrapped in a shell script which does understand this command line syntax and which then executes the real transport program.

Here's an example which uses ssh(1) as the transport:

rdist -P /usr/local/bin/ssh -f myDistfile

If the rcmd(3) method is used, then rdist makes the connection to the target host itself and runs the rdistd server program as shown below. The default, and preferred method, is to use rsh(1c) to make the connection to target hosts. This allows rdist to be run without being setuid to ``root''.

On each target host Rdist will attempt to run the command

rdistd -S

or

<rdistd path> -S

if the -p option was specified. If no -p option is included, or the <rdistd path> is a simple filename, rdistd or <rdistd path> must be somewhere in the $PATH of the user running rdist on the remote (target) 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:

-p <rdistd-path>

Set the path where the rdistd server is searched for on the target host.

-P <transport-path>

Set the path to the transport command to be used. This is normally rsh(1c) but can be any other program - such as ssh(1) - which understands rsh(1c) command line syntax and which provides an appropriate connection to the remote host. The transport-path may be a colon seperated list of possible pathnames. In this case, the first component of the path to exist is used. i.e. /usr/bin/rsh:/usr/bin/remsh , /usr/bsd/rsh.

-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.

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

The valid facility names are:

types should be a comma separated list of message types. Each message type specified enables that message level. This is unlike the syslog(3) system facility which uses an ascending order scheme. The following are the valid types:

Here is a sample command line option:

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

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> `)'

list '-' list
or
list '+' list
or
list '&' list

The shell meta-characters `[', `]', `{', `}', `*', and `?' are recognized and expanded (on the local host only) in the same way as csh(1). 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 -o distopts 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 (e.g., 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(1) 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(1) 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.

BASEFILE

The basename 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 `:' (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.

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/sbin/sendmail "/usr/sbin/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 ;

ENVIRONMENT¶

TMPDIR

Name of temporary directory to use. Default is /tmp.

FILES¶

distfile	- input command file
$TMPDIR/rdist*	- temporary file for update lists

SEE ALSO¶

sh(1), csh(1), stat(2), rsh(1c), rcmd(3)

DIAGNOSTICS¶

NOTES¶

If the basename of a file (the last component in the pathname) is ".", then rdist assumes the remote (destination) name is a directory. i.e. /tmp/. means that /tmp should be a directory on the remote host.

The following options are still recognized for backwards compatibility:

BUGS¶

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).

If a hardlinked file is listed more than once in the same target, then rdist will report missing links. Only one instance of a link should be listed in each target.