Greetings.
Just for note.
Some time ago i thought about the same problem.
I started something then had delayed it forever in favour of fast wrong
way.
So, the aim was:
---
NAME
modcfg - modify configuration
SYNOPSIS
modcfg -f config_file -t config_type {-s param=val | -u param}
modcfg -l
modcfg -i plugin
DESCRIPTION
The modcfg utility modifies configuration file in
accordance to parameters.
The following options are available:
-f config_file - the file itself which to be modified
-t config_type - type of config_file. Type specifies the internal
structure of config_file, or, more roughly,
program which this file belongs to. To
list available types see -l option.
-s param=val - set configuration parameter 'param' to value
'val'.
-u param - unset configuration parameter 'param' (or set it to
default).
-l - list all supported types of config files.
-i plugin - install plugin 'plugin' for modcfg utility.
Plugin is used to support additional configuration file
type.
EXAMPLES
The command
modcfg -f /etc/rc.conf -t rc -s keymap=ru.cp1251
sets parameter 'keymap' to value 'ru.cp1251'in file rc.conf.
The command
modcfg -f /etc/rc.conf -t rc -u keymap
resets parameter 'keymap' to default value.
To install obtained plugin 'samba.mcfg' use
modcfg -i samba.mcfg
After that configuration type 'samba' will be supported.
---
INTERNALLY
modcfg itself is very simple. It parse command line options, then load
plugin (module) for specified 'config_type', then call _set(file,param,
value) or _unset(file,param) function from this module.
So, plugin (module) should have functions such as:
_set(file, param, value) or, better name, {$type}_set. rc_set, for
example.
_unset(file, param)
_description - for display in module list.
FUTURE
Of course, better way is to run modcfg as:
modcfg rc {-s ... | -u ...}
i.e. reduce "-f /etc/rc.conf -t rc" to the key "rc",
i.e. add another call scheme
modcfg subsystem {-s ... | -u ...}
For rc it is trivial. But in general, for all installed programs and
they instances, it is not possible now.
Wednesday, October 13, 2010, 3:06:25 AM, you wrote:
DT> On Tue, 2010-10-12 at 12:10 -0700, Doug Barton wrote:
>> On 2010-10-11 at 10:40 -0700, Doug Barton wrote:
>> | So to summarize, the general idea is a good one and needed, and an area
>> | that I'd like to see more work in. Perhaps it might be a good idea to
>> | move the discussion about that to freebsd...@?
>> |
>> |On 2010-10-11 at 12:22 -0700, Devin Teske wrote:
>> |> I'll look into signing up for the rc mailing list (didn't see that when
>> |> I checked last -- I'll have to look again). Maybe I'll post v2.0 to
>> |> there (but will cc back hackers cause I know folks may not be part of
>> |> both).
>>
>> The canonical way to deal with that is to post the message to the proper
>> list (-rc@), then post a brief note to the other list (-hackers@) saying
>> where the discussion is being continued. We discourage people from
>> cc'ing multiple FreeBSD lists.
DT> This thread is moving over to the -rc@ list.
DT> New thread: sysrc(8) -- a sysctl(8)-like utility for managing rc.conf(5)
DT> The first post to the -rc@ list will be version 2.0 of the script which
DT> attempts to address the following (which were discussed in this thread
DT> here on -hackers@):
DT> 1. Style -- remove some personal styles in favor of standardized styles.
DT> (the FreeBSD environment doesn't need all the extra things that are
DT> required to run in an embedded environment -- which the first version
DT> was coded for)
DT> 2. Remove a disgusting-amount of comments (the first release of the
DT> script had a hurdle to climb in that it had to establish rapport with
DT> the targeted audience -- y'all).
DT> 3. Remove shell inheritance of SUCCESS/FAILURE (this was silly for a
DT> finished product).
DT> 4. Remove unnecessary code-sense (some things just don't need to be
DT> tested for in a known environment -- such as FreeBSD vs. embedded).
DT> 5. Remove dependency checks (have(), depend(), and show_deps() are
DT> gone).
DT> 6. Remove fake "function" keywords (public objections win)
DT> 7. Rename sysrc() function to sysrc_get() to:
DT> a. prevent confusion between the script and the internal function
DT> b. to coincide with the remainder of related functions (sysrc_get,
DT> sysrc_set, sysrc_find, and sysrc_desc).
DT> 8. Fix sysrc_get() function to mask positional parameters (don't expand
DT> "1", "2", etc.)
DT> 9. Fix sysrc_get() function to clean the environment prior to sourcing
DT> rc.conf(5) files (preventing expansion of normals such as PS1, TERM,
DT> etc.)
DT> 10. New function: `sysrc_find $varname'
DT> Find which file holds the effective last-assignment to a given variable
DT> within the rc.conf(5) file(s). If the variable is found in any of the
DT> rc.conf(5) files, the function prints the filename it was found in and
DT> then returns success. Otherwise output is NULL and the function returns
DT> with error status.
DT> 11. Fix sysrc_set() function to use mktemp(1) (prevent race-conditions
DT> where sysrc(8) could be executing in concurrence, possibly whacking the
DT> output-file in an unexpected manner).
DT> 12. New function: `sysrc_desc $varname'
DT> Attempts to return the comments associated with varname from the rc.conf
DT> (5) defaults file `/etc/defaults/rc.conf' (or whatever RC_DEFAULTS
DT> points to). Multi-line comments are joined together. Results are NULL if
DT> no description could be found.
DT> 13. Use getopts(1) to parse command-line options rather than manually
DT> parsing (now we can support grouping of flags -- i.e. "-avN").
DT> 14. Remove `--help' option (using getopts(1) now ... that was the only
DT> long-option we had, and we don't need it).
DT> 15. Remove `-d' as we know it. No longer dump internal dependency list,
DT> but mimick `-d' from sysctl(8) -- Print a description of the given
DT> variable.
DT> 16. Remove `SYSRC_SHOW_DEPS' environment variable.
DT> 17. Add `SYSRC_VERBOSE' environment variable (inheritable from the
DT> shell, so that folks whom don't want to always pass `-v' can plop
DT> `SYSRC_VERBOSE=1' into their shell startup scripts, `~/.bash_profile'
DT> and `~/.profile' for example).
DT> 18. Add `-f file' option.
DT> Operate on the specified file(s) instead of rc_conf_files.
DT> 19. Add `-a' option.
DT> Dump a list of non-default configuration variables.
DT> 20. Add `-A' option.
DT> Dump a list of all configuration variables (incl. defaults).
DT> 21. Add `-v' option.
DT> Verbose. Print the pathname of the specific rc.conf(5) file where the
DT> directive was found.
DT> 22. Add `-i' option.
DT> Ignore unknown variables.
DT> 23. Add `-N' option.
DT> Show only variable names, not their values.
DT> And, here's the new usage:
DT> Usage: sysrc [OPTIONS] name[=value] ...
DT> OPTIONS:
DT> -h Print this message to stderr and exit.
DT> -f file Operate on the specified file(s) instead of
rc_conf_files.
DT> -a Dump a list of non-default configuration variables.
DT> -A Dump a list of all configuration variables (incl.
defaults).
DT> -d Print a description of the given variable.
DT> -e Print query results as `var=value' (useful for producing
DT> output to be fed back in). Ignored if -n is specified.
DT> -v Verbose. Print the pathname of the specific rc.conf(5)
DT> file where the directive was found.
DT> -i Ignore unknown variables.
DT> -n Show only variable values, not their names.
DT> -N Show only variable names, not their values.
DT> ENVIRONMENT:
DT> RC_DEFAULTS Location of `/etc/defaults/rc.conf' file.
DT> SYSRC_VERBOSE Default verbosity. Set to non-NULL to enable.
DT> See you all on the -rc@ list.
--
Best regards,
Anthony mailto:a...@mail.ru
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