zfs discuss - Aug 2009 - libzfs API: sharenfs, sharesmb, shareiscsi, $custom ?

Hello list,

As the developer of software that exports data/shares like that of NFS 
and Samba. (HTTP/UPnP export, written in C) I am curious if the libzfs 
API is flexible enough for me to create my own file-system attributes, 
similar to that of "sharenfs" and obtain this information in my
software.

Perhaps something in the lines of:

  zfs -o shareupnp=on zpool1/media

And I will modify my streamer software to do the necessary calls to 
obtain the file-systems set to export.

Or are there other suggestions to achieve similar results? I could 
mirror "sharenfs" but I was under the impression that the API is 
flexible. The ultimate goal is to move away from static paths listed in 
the config file.

Lund

-- 
Jorgen Lundman       | <lundman at lundman.net>
Unix Administrator   | +81 (0)3 -5456-2687 ext 1017 (work)
Shibuya-ku, Tokyo    | +81 (0)90-5578-8500          (cell)
Japan                | +81 (0)3 -3375-1767          (home)

Jorgen,

> As the developer of software that exports data/shares like that of NFS and
> Samba. (HTTP/UPnP export, written in C) I am curious if the libzfs API is
> flexible enough for me to create my own file-system attributes, similar to
> that of "sharenfs" and obtain this information in my software.
>
> Perhaps something in the lines of:
>
> ?zfs -o shareupnp=on zpool1/media
ZFS allows user-defined attributes to be set on datasets. So how about
something like that:

zfs set net.lundman:shareupnp=on rpool/export/ext
> And I will modify my streamer software to do the necessary calls to obtain
> the file-systems set to export.
>
> Or are there other suggestions to achieve similar results? I could mirror
> "sharenfs" but I was under the impression that the API is
flexible. The
> ultimate goal is to move away from static paths listed in the config file.
That''s a perfect use case for user-defined attributes

-- 
Regards,
        Cyril

Hi Jorgen,

Does that software work to stream media to an xbox 360?  If so could I have a
play with it?  It sounds ideal for my home server.

cheers,

Ross
-- 
This message posted from opensolaris.org

It is "llink", which was initially just HTTP streamer for 
Syabas/NetworkMediaTank, but I did just add UPnP, based on whtsup360 dumps.

http://lundman.net/wiki/index.php/Llink

You are welcome to try the latest development sources and test, but I 
believe the current state is that it shows up on 360, but does not browse.

However, llink just shares content, no transcoding. At least not yet.


Regarding the original question;
It seems that it is easy to add own attributes, I will peruse the  API 
documentation detailing how I would iterate file-systems looking for my 
attribute, since I would rather not system("zfs") hack it.


Lund



Ross wrote:
> Hi Jorgen,
> 
> Does that software work to stream media to an xbox 360?  If so could I have
a play with it?  It sounds ideal for my home server.
> 
> cheers,
> 
> Ross
-- 
Jorgen Lundman       | <lundman at lundman.net>
Unix Administrator   | +81 (0)3 -5456-2687 ext 1017 (work)
Shibuya-ku, Tokyo    | +81 (0)90-5578-8500          (cell)
Japan                | +81 (0)3 -3375-1767          (home)

I cheated and simply use system() for the time being, but I will say 
that was rather nice and easy. Thank you Sun and OpenSolaris people.


llink.conf:
# If you use ZFS, you can auto-export any filesystem with a certain 
attribute set.
# For example: zfs set net.lundman:sharellink=on zpool1/media
ROOT|ZFS=net.lundman:sharellink|PATH=/usr/sbin/zfs


@root.c
         debugf("      : looking for ZFS filesystems\n");
         snprintf(buffer, sizeof(buffer), "%s list -H -o
mountpoint,%s",
                  path, zfs);
         spawn = lion_system(buffer, 0, LION_FLAG_FULFILL, zfs);
         if (spawn) lion_set_handler(spawn, root_zfs_handler);



# zfs set net.lundman:sharellink=on zpool1/media

# ./llink -d -v 32

./llink - Jorgen Lundman v2.2.1 lundman at shinken.interq.or.jp build 1451 
(Tue Aug 18 14:02:44 2009) (libdvdnav).

       : looking for ZFS filesystems
       : [root] recognising ''xtrailers''
       : zfs command running
       : zfs adding ''/zpool1/media''
       : [root] recognising ''/zpool1/media''
       : zfs command finished.
[main] ready!


-- 
Jorgen Lundman       | <lundman at lundman.net>
Unix Administrator   | +81 (0)3 -5456-2687 ext 1017 (work)
Shibuya-ku, Tokyo    | +81 (0)90-5578-8500          (cell)
Japan                | +81 (0)3 -3375-1767          (home)