function () and Ubuntu... about gtkdialog

[GoogleCodeExporter]

This bug is very old ...
https://bugs.launchpad.net/ubuntu/+source/gtkdialog/+bug/517065
François

Original comment by [email protected] on 13 Aug 2011 at 11:04

[GoogleCodeExporter]

I have left thunor a private message on Murg-linux.com/puppy concerning this 
issue as I did a little rewrite of the submitted script and it works just fine 
for me.
[email protected]  That is 8-bit on the Puppy forum. 

Original comment by [email protected] on 14 Aug 2011 at 9:08

[GoogleCodeExporter]

If frafas changes the line date > /tmp/date
to echo $ENTRY_DATE > /tmp/date
and the line <input>cat /tmp/date</input>
to <input>date</input>
His example will run fine.
The main reason is that the date command does not accept any parameters and so 
is attempting to see the "> /tmp/date" as a parameter.
That is the best I can explain it.

Original comment by [email protected] on 15 Aug 2011 at 2:15

[GoogleCodeExporter]

Yess :)
solved "export -f" are ok
use this:
<action>exec $SHELL -c 'now'</action>

Exemple:


#!/bin/bash
function now () {
date > /tmp/date
}
export -f now
export script='<vbox>
<entry>
<variable>ENTRY_DATE</variable>
<input>cat /tmp/date</input>
</entry>
<button>
<label>Refresh</label>
<action>exec $SHELL -c 'now'</action>
<action>refresh:ENTRY_DATE</action>
</button>
</vbox>'
gtkdialog3  -p script
exit 0

Original comment by [email protected] on 16 Aug 2011 at 10:14

[GoogleCodeExporter]

Hi

Firstly I've been busy so sorry for the delay. I saw the private message from 
8-bit but had absolutely no idea what he was talking about since the subject 
said "Issue 23" when this is issue 24 :D

That "bashims" issue on launchpad was fixed months ago.

I found this at https://wiki.ubuntu.com/DashAsBinSh :

function

The function builtin is a bashism, and can almost always simply be removed. If 
you remove it, make sure that there are parentheses after the function name. A 
function definition in POSIX shell looks like this:

function_name () {
    function body
}

So, possibly you must remove "function". I have seen this reported elsewhere so 
I will avoid using it in the future.

Regards,
Thunor

Original comment by [email protected] on 16 Aug 2011 at 3:27

[GoogleCodeExporter]

thunor,
  Sorry for the confusion in my PM.  When I realized the issue was not the right one and went to edit it, you had already got the PM.

frafas, 
  If you want your script to show the date and create the /tmp/date file on starting, just add the line $SHELL -c 'now' between the 2 export lines.
And thank you for showing me another way to execute an external command from an 
<action> line.

Original comment by [email protected] on 16 Aug 2011 at 3:55

[GoogleCodeExporter]

Right, so the conclusion is that the "function" keyword and "export -f 
funcname" aren't supported by dash and that dash is used as the subshell on 
Ubuntu and as the C system() function executes /bin/sh, if that doesn't point 
to bash you'll need to use <action>bash -c funcname</action> or something along 
those lines (<input> commands too).

Anyway, since C's POSIX system() function executes /bin/sh, this really should 
be something to address within the shell script and Gtkdialog XML structure. I 
could create a Gtkdialog command-line argument so that the command passed to 
system() is prepended with "bash -c " or whatever the user supplies, but then 
this can be managed just as effectively from the shell script, example:

EXECBASH="bash -c"
...
<action>$EXECBASH funcname</action>

Original comment by [email protected] on 22 Aug 2011 at 11:18

• Changed state: Done

[GoogleCodeExporter]

Original comment by [email protected] on 6 Sep 2011 at 11:20

• Added labels: 8-bit