Re: [fuse-devel] Option with multiple values

[D.Edmons <dem...@co...>]

David,

In that case, can't you just type them on the command line and
pass to fuse_main() argv directly?  That doesn't work for me because
I have to open the disk which contains the FS.  So my command line
is:

    ./rtfuse /dev/sdb ~/mnt -d -o fsname=/dev/sdb -o use_ino (before I 
recoded)
    ./rtfuse /dev/sdb ~/mnt -d         (after I recoded)

where you would have

    ./myfs ~/mnt -o arg1=alice -o arg2=bob -o arg3=ted -d

I suspect if you want to do

    ./myfs ~/mnt -o args=alice,bob,ted

then you'll have to manipulate the argv stack in you main()
to parse it yourself.  Have you tried to do:

    ./myfs ~/mnt -o arg1=alice,arg2=bob,arg3=ted

I'm not at all sure it'd work, but glancing at fuse/lib/opt.c
suggests that it's worth a try.


Dale


David Sklar wrote:
> Hi, Dale. I am not sure we are trying to accomplish the same thing --
> I want to invoke my fs with a command like "myfs -o
> arg=alice,bob,charlie" or "myfs -o arg=alice -o arg=bob -o
> arg=charlie" -- so everything is coming from the command line, not
> being manipulated inside main(). Does that make sense?
>
> David
>
>
> On 5/18/07, D.Edmons <dem...@co...> wrote:
>   
>> David,
>>
>> I'm just trying to get the write portion of my FS going and
>> I worked on the same issue yesterday.  I did something like
>> the following:
>>
>> main() {
>>     char ctmp[80], *rtargv[20];   // some useful number
>>     int rtargc=0;
>>
>>     ctmp[0]=0;
>>
>>     /* set mount name to path like other FS's */
>>     rtargv[rtargc++] = strdup("-o");
>>     sprintf(ctmp, "fsname=%s", argv[1]);   // or strcat(), whichever's
>> your preference
>>     rtargv[rtargc++] = strdup(ctmp);
>>
>>     /* set use_ino option */
>>     rtargv[rtargc++] = strdup("-o");
>>     rtargv[rtargc++] = strdup("use_ino");
>>
>>     // etc....
>> }
>>
>> This isn't the exact code I used, but close enough.  The
>> rtargv[] is the arg list I pass to fuse_main().  It differs
>> from the one passed to my fuse program.
>>
>> Hope this helps.  The are much better ways to handle
>> this I'm sure; I just wanted to quickly add a couple of
>> options.  Treat each one individually; grouping them is
>> likely your problem.
>>
>>
>> Dale E. Edmons
>>
>> David Sklar wrote:
>>     
>>> I'd like to have a command-line option for my filesystem that can
>>> accept multiple values.
>>>
>>> I tried something like:
>>>
>>> struct my_arg_t {
>>>   char *stuff;
>>> }
>>>
>>> #define MY_OPT(t, p, v) { t, offsetof(struct my_arg_t, p), v }
>>> static struct fuse_opt my_opts[] = {
>>>     MY_OPT("stuff=%s", stuff,  0 ),
>>>     FUSE_OPT_END
>>> }
>>>
>>> But then when I invoke my filesystem with "-o
>>> stuff=alice,bob,charlie", fuse uses the commas as argument delimiters.
>>> (I could switch the argument delimeter to something else, but commas
>>> would be nice.)
>>>
>>> So then, I tried:
>>>
>>> #define MY_STUFF_KEY 100
>>> static struct fuse_opt my_opts[] = {
>>>     FUSE_OPT_KEY("stuff=%s", MY_STUFF_KEY),
>>>     FUSE_OPT_END
>>> }
>>>
>>> And in my opt_proc I can successfully key off of MY_STUFF_KEY and deal
>>> with the value, but then when I call fuse_main() I get an "unknown
>>> option" error for the "stuff=whatever" values specified on the command
>>> line.
>>>
>>> Is there a recommended / appropriate way to do command line options
>>> that can take multiple values?
>>>
>>> Thanks,
>>> David
>>>
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>>>       
>>     
>
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