[Bashburn-info] NEW bashburn config file determination

[Markus K. <mar...@on...>]

I was nerved to only get bashburn to work by running "Install.sh"
which then in turn modifies "BashBurn.sh" to the correct "BBROOTDIR".

This may work but has some disadvantages:

1. Programs modifying other programs code is not always nice and clear. 
And if someone does not know the

typeset BBROOTDIR='@@BBROOTDIR@@'

construct there could happen ugly things. Also it may become a 
maintenance nightmare.

2. Distributions can not clearly build their own package installer since 
bashburn does not work unless bashburn "Install.sh" is executed.

3. The user expects traditionally under unixes following strategies to 
search for config-file:
 -> search user's $HOME for config.
 -> search system wide config (mostly in "/etc/").
 -> fetch some (hard-coded) default config or ask user interactively for 
config source or values.


I have now changed "BashBurn.sh" in my local trunk and added following 
(note that for this to work in "bashburn.rc" "BBROOTDIR" has to be added 
and set again):


-------

#!/bin/bash

###############################################################################
# Checks whether given file is readable and a actual config file of 
bashburn.
# IN[1]: FILENAME.
# OUT[SUCCESS]: <TRUE>
# OUT[FAILURE]: <FALSE>
function is_valid_configfile {
    test -r $1  &&  grep -q "VERSION: 3.x" $1
}


## Determine the root directory (BBROOTDIR) of bashburn where all
## additional programm files for basburn are.
## CASE1: user config from $HOME:
if is_valid_configfile "$HOME/.bashburnrc"
    then
    typeset BBROOTDIR=$(grep "BBROOTDIR" $HOME/.bashburnrc | cut -d: -f2)
## CASE2: global config from /etc/
    elif is_valid_configfile "/etc/.bashburnrc"
    then
    typeset BBROOTDIR=$(grep "BBROOTDIR" /etc/.bashburnrc | cut -d: -f2)
## CASE3: Config from bashburn Install.sh:
    else
    # NOTE: BBROOTDIR will be later actualized by bashburn installation 
script
    # "Install.sh".
    typeset BBROOTDIR='@@BBROOTDIR@@'
fi


-----------

Let me know what you think. I have not checked it in yet, since our 
svn-server seems not online in the moment.
Like you see I have left the "@@BBROOTDIR@@" as last option, but maybe 
we should delete it if there is no good reason against it.


Markus