[vdr] Re: possible bug: VDR1.2.5 commandline interpreting

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Alfred Zastrow wrote:
> 
> ...
> @Klaus
> 
> I found some more strange commandline handling, please take a look to
> the following examples:

I'll use the following short shell script to test these:

#!/bin/sh
echo $1
echo $2
echo $3
echo $4
echo $5

> This works:
> -----------
> # opt="-P dvd '-C/dev/cdroms/cdrom0'"
> # vdr $opt  [more parameters...]

If I call the above script with

script $opt more

I get

-P
dvd
'-C/dev/cdroms/cdrom0'
more

The -C... option is recognized since it starts with a ', and
VDR just ignores this parameter.

> This doesn't work:
> ------------------
> # opt="-P'dvd -C/dev/cdroms/cdrom0'"
> # vdr $opt  [more parameters...]

-P'dvd
-C/dev/cdroms/cdrom0'
more

Here the plugin name is 'dvd, which obviously isn't right.
This is a shell/quoting problem, not a VDR problem.

> This works:
> -----------
> opt="-P vcd"
> # vdr --lib=/lib/vdr $opt  [more parameters...]

--lib=/lib/vdr
-P
vcd
more

Looks good, there is one parameter to the -P option, which
is the plugin name, and the --lib option comes _before_ the
-P option, as it should be.

> This doesn't work:
> ------------------
> opt="-P vcd"
> # vdr $opt --lib=/lib/vdr  [more parameters...]

-P
vcd
--lib=/lib/vdr
more

Assuming that the vcd plugin is located in the /lib/vdr directory,
it is clear that this can't work, because the --lib option must
come _before_ the -P option (see man vdr).

> This also doesn't work:
> -----------------------
> opt="-P'vcd -v /dev/cdroms/cdrom0'"
> # vdr $opt --lib=/lib/vdr  [more parameters...]

-P'vcd
-v
/dev/cdroms/cdrom0'
--lib=/lib/vdr
more

> (message  vdr: /lib/vdr/libvdr-'vcd.so.1.2.6pre2: cannot open shared
> object file: No such file or directory)

Again the plugin name is given as 'vcd, which is wrong (shell/quoting
problem, not a VDR problem).

> If I modify the first line to
> 
> # opt="-Pvcd '-v /dev/cdroms/cdrom0'"
> 
> this will be accepted,

-Pvcd
'-v
/dev/cdroms/cdrom0'
--lib=/lib/vdr
more

The second and third parameters don't look good, though (see the ')

> also this version
> 
> # opt="-Pvcd \"-v /dev/cdroms/cdrom0\""

-Pvcd
"-v
/dev/cdroms/cdrom0"
--lib=/lib/vdr
more

Same here, just with ".

> The whole thing is pretty unpleasant, because I need a dynamic, not a
> static command line.

What you are describing are all shell and/or quoting problems,
not VDR problems. The last two examples don't cause a VDR error message
because VDR only processes real options and completely ignores non-option
parameters. I'll make a note to change this and issue an error message
if, after processing all options, there are still command line
parameters left. Of course, this wouldn't help you...

Klaus


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