Help needed with using gnomevfs/gvfs

[Andreas Heinlein-2]

Hello,

I need to write a small app which will catch volume mounts and unmounts
as well as drive insertions/removal.

I have written a Perl daemon for that, which hooks to the signals
"drive-connected", "drive-disconnected", "volume-mounted" and
"volume-pre-unmount" of a Gnome2::VFS::VolumeMonitor object. Getting
"volume-mounted" or the disk signals works just fine, but I never get
"volume-pre-unmount".

I have no idea why, I already asked on the gtk2-perl mailing list but
got no answer. In addition, I noticed that I am not getting
"drive-connected" any more und Ubuntu Jaunty when the drive in question
contains no recognized file system. This is bad because one use for this
app is to auto-mount TrueCrypt encrypted volumes.

I suspect this has to do with deprecation of GnomeVFS, but Python and
Perl (the languages I know best) bindings for GVFS seem to not exist or
are badly documented.

Can anyone help me with this?

Thanks, Andreas
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[Alexander Larsson]

On Thu, 2009-04-23 at 10:10 +0200, Andreas Heinlein wrote:

> Hello,
>
> I need to write a small app which will catch volume mounts and unmounts
> as well as drive insertions/removal.
>
> I have written a Perl daemon for that, which hooks to the signals
> "drive-connected", "drive-disconnected", "volume-mounted" and
> "volume-pre-unmount" of a Gnome2::VFS::VolumeMonitor object. Getting
> "volume-mounted" or the disk signals works just fine, but I never get
> "volume-pre-unmount".
>
> I have no idea why, I already asked on the gtk2-perl mailing list but
> got no answer. In addition, I noticed that I am not getting
> "drive-connected" any more und Ubuntu Jaunty when the drive in question
> contains no recognized file system. This is bad because one use for this
> app is to auto-mount TrueCrypt encrypted volumes.
>
> I suspect this has to do with deprecation of GnomeVFS, but Python and
> Perl (the languages I know best) bindings for GVFS seem to not exist or
> are badly documented.
>
> Can anyone help me with this?

You only get volume-pre-unmount when unmounting via gnome-vfs. And
unfortunately, everything in the desktop now unmounts via gio, so you
need to use that to get this.

GVfs has no bindings, because it doesn't have an API, its purely an
extension of glib. All the API is in gio (in glib), which is availible
at least in the python bindings.


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[Andreas Heinlein-2]

Alexander Larsson schrieb:

> On Thu, 2009-04-23 at 10:10 +0200, Andreas Heinlein wrote:
>  
>> Hello,
>>
>> I need to write a small app which will catch volume mounts and unmounts
>> as well as drive insertions/removal.
>>
>> I have written a Perl daemon for that, which hooks to the signals
>> "drive-connected", "drive-disconnected", "volume-mounted" and
>> "volume-pre-unmount" of a Gnome2::VFS::VolumeMonitor object. Getting
>> "volume-mounted" or the disk signals works just fine, but I never get
>> "volume-pre-unmount".
>>
>> I have no idea why, I already asked on the gtk2-perl mailing list but
>> got no answer. In addition, I noticed that I am not getting
>> "drive-connected" any more und Ubuntu Jaunty when the drive in question
>> contains no recognized file system. This is bad because one use for this
>> app is to auto-mount TrueCrypt encrypted volumes.
>>
>> I suspect this has to do with deprecation of GnomeVFS, but Python and
>> Perl (the languages I know best) bindings for GVFS seem to not exist or
>> are badly documented.
>>
>> Can anyone help me with this?
>>    
>
> You only get volume-pre-unmount when unmounting via gnome-vfs. And
> unfortunately, everything in the desktop now unmounts via gio, so you
> need to use that to get this.
>
> GVfs has no bindings, because it doesn't have an API, its purely an
> extension of glib. All the API is in gio (in glib), which is availible
> at least in the python bindings.
>
>  

Thanks for your help. I found out how to get a GVolumeMonitor reference
with Python, but the situation is now even worse. I tried connecting to
all signals of GVolumeMonitor, but this time I get only "mount-added"
and "mount-removed". Still no pre-unmount, and no drive-(dis)connected
(I have yet to find out what "volume-(dis)connected" means here). I
managed to get the "unmounted" signal of a GMount returned by above
signals, but that's too late; I need to be able to write to the
filesystem being unmounted.

Also, I noticed that the output of e.g. get_mounts() in my app does
never change. I.e. this code snippet:

#!/usr/bin/python
import gio, time
while True:
    print gio.volume_monitor_get().get_mounts()
    time.sleep(1)

will always show the state when it was invoked, but will never display
new mounts and keep displaying mount which where removed in the meantime.

Can you help me again?

Thanks,
Andreas
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[Alexander Larsson]

On Fri, 2009-04-24 at 13:07 +0200, Andreas Heinlein wrote:

> Alexander Larsson schrieb:
> > On Thu, 2009-04-23 at 10:10 +0200, Andreas Heinlein wrote:
> >  
> >> Hello,
> >>
> >> I need to write a small app which will catch volume mounts and unmounts
> >> as well as drive insertions/removal.
> >>
> >> I have written a Perl daemon for that, which hooks to the signals
> >> "drive-connected", "drive-disconnected", "volume-mounted" and
> >> "volume-pre-unmount" of a Gnome2::VFS::VolumeMonitor object. Getting
> >> "volume-mounted" or the disk signals works just fine, but I never get
> >> "volume-pre-unmount".
> >>
> >> I have no idea why, I already asked on the gtk2-perl mailing list but
> >> got no answer. In addition, I noticed that I am not getting
> >> "drive-connected" any more und Ubuntu Jaunty when the drive in question
> >> contains no recognized file system. This is bad because one use for this
> >> app is to auto-mount TrueCrypt encrypted volumes.
> >>
> >> I suspect this has to do with deprecation of GnomeVFS, but Python and
> >> Perl (the languages I know best) bindings for GVFS seem to not exist or
> >> are badly documented.
> >>
> >> Can anyone help me with this?
> >>    
> >
> > You only get volume-pre-unmount when unmounting via gnome-vfs. And
> > unfortunately, everything in the desktop now unmounts via gio, so you
> > need to use that to get this.
> >
> > GVfs has no bindings, because it doesn't have an API, its purely an
> > extension of glib. All the API is in gio (in glib), which is availible
> > at least in the python bindings.
> >
> >  
> Thanks for your help. I found out how to get a GVolumeMonitor reference
> with Python, but the situation is now even worse. I tried connecting to
> all signals of GVolumeMonitor, but this time I get only "mount-added"
> and "mount-removed". Still no pre-unmount, and no drive-(dis)connected
> (I have yet to find out what "volume-(dis)connected" means here). I
> managed to get the "unmounted" signal of a GMount returned by above
> signals, but that's too late; I need to be able to write to the
> filesystem being unmounted.

Pre-unmount was actually only implemented very recently, so you need
gnome 2.26.

> Also, I noticed that the output of e.g. get_mounts() in my app does
> never change. I.e. this code snippet:
>
> #!/usr/bin/python
> import gio, time
> while True:
>     print gio.volume_monitor_get().get_mounts()
>     time.sleep(1)
>
> will always show the state when it was invoked, but will never display
> new mounts and keep displaying mount which where removed in the meantime.

Yes, for this to work you must be running the glib mainloop.

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