KDE Volume Manager not receiving mount points from HAL - it can't cope!

[David Zeuthen]

On Tue, 2004-09-21 at 02:34 +0100, Luke Kenneth Casson Leighton wrote:
> On Tue, Sep 21, 2004 at 01:54:16AM +0100, Luke Kenneth Casson Leighton wrote:
> 
> > > > This hal device object is a child of the hal
> > > > device object representing the drive itself. It works just like when
> > > > using partitioned media, e.g. /dev/sdb and /dev/sdb1 on a memory card.
> > > > One of the points of hal is to abstract the difference between
> > > > partitioned and non-partitioned media; e.g. provide an abstraction with
> > > > drives and volumes instead.
> > > > 
> > > > So, when you mount the volume using mount(1), e.g. 'mount /dev/sda' from
> > > > the commandline or from a program like KVM (since an entry
> > > > relating /dev/sda and /media/floppy1 is already in /etc/fstab file this
> > > > is possible), 
> > 
> >  okay, i think i might have tracked down what the problem is.
> > 
> >  notice in the above that :
> > > 	  storage.removable = false  (bool)
> > 
> >  ah... it's a usb floppy.              "/proc/scsi/usb-storage/%d"
> >  from block_class.c says it's one of those
> >  "Protocol: Uniform Floppy Interface (UFI)" things.
> > 
> >  so has_removable_media will get set to TRUE.
> > 
> >  ... only to have it set to FALSE because there's no entry
> >  /sys/block/sdb/removable in order to be read

You need a more recent kernel to get the removable file in sysfs. Before
that HAL had to use heuristics like looking at the textual strings etc.
to figure this out (we still do stuff like that for some things as the
kernel is not, uhm, perfect)

> >  ah... um... what gives?
> 
>  okay, got it.
> 
>  by forcing the setting of storage.removable, the device comes up
>  as "USB-FDU", under file:/media/floppy3 - no floppy:/ involved
>  whatsoever, this might be because of my hacking in KVM...
>  
>  KDE on startup automatically forces the mounting of the damn thing
>  (which i'm not happy about, let's try removing the floppy to make that
>   fail, see what happenss...)
> 
>  okay, startup with usb floppy unplugged, with no media:
> 
>  * KVM determines that it's a floppy, and plugs in floppy:/
> 
>  * HAL behaves correctly.
> 
>  i put the floppy into the drive:
> 
>  * HAL goes off and does some whizzy stuff!  whoo hoo!
> 

Yeah, we probe the media for filesystem, label, UUID and so forth.

>  * KVM throws up some funny little window thing saying something
>    about the device having to be unmounted before removal (which
>    no sane user is ever going to do, but that's another story).

Hey, neat.
 
>  * df shows that it's not actually mounted... ten seconds later it
>    is...
> 
>  * konqueror works: clicking on USB-FDU is all hunky-dory.
> 
>  * but clicking on Floppy brings up a device error.
> 
>  unplugging the floppy:
> 
>  * the device disappears (both Floppy and USB-FDU)
> 
>  * df shows it's unmounted.
> 
> 
>  the only bit that's weird - and probably my own fault - is that
>  uhm... KVM shows an entry for "floppy" _and_ an entry for "USB-FDU".
> 
>  is _this_ what you were referring to about "volumes"?
>
>  namely that even a floppy can contain volumes and should not be
>  treated differently from other storage devices (which at present
>  it looks like it is: in KVM there is no link from the
>  usb floppy device block_8_0 to the volume).
> 

Yeah, exactly. Possibly KVM is treating this as two devices?

> 
> 
> Dumping 39 device(s) from the Global Device List:
> -------------------------------------------------
> udi = '/org/freedesktop/Hal/devices/block_4145-AD66'
>   info.udi = '/org/freedesktop/Hal/devices/block_4145-AD66'  (string)
>   volume.block_size = 512  (0x200)  (int)
>   volume.num_blocks = 2880  (0xb40)  (int)
>   volume.is_disc = false  (bool)
>   volume.is_mounted = true  (bool)
>   volume.mount_point = '/media/floppy3'  (string)
>   volume.label = ''  (string)
>   volume.uuid = '4145-AD66'  (string)
>   volume.fsversion = 'FAT12'  (string)
>   volume.fsusage = 'filesystem'  (string)
>   volume.fstype = 'vfat'  (string)
>   info.product = 'Volume (vfat)'  (string)
>   info.parent = '/org/freedesktop/Hal/devices/block_8_0'  (string)
>   info.category = 'volume'  (string)
>   info.capabilities = 'block volume'  (string)
>   info.bus = 'block'  (string)
>   block.no_partitions = true  (bool)
>   block.have_scanned = false  (bool)
>   block.is_volume = true  (bool)
>   block.device = '/dev/sda'  (string)
>   block.major = 8  (0x8)  (int)
>   block.minor = 0  (0x0)  (int)
>   block.storage_device = '/org/freedesktop/Hal/devices/block_8_0'  (string)
> 
> udi = '/org/freedesktop/Hal/devices/block_8_0'
>   info.udi = '/org/freedesktop/Hal/devices/block_8_0'  (string)
>   storage.hotpluggable = true  (bool)
>   storage.removable = true  (bool)
>   info.product = 'USB-FDU'  (string)
>   info.vendor = 'Y-E DATA'  (string)
>   storage.drive_type = 'floppy'  (string)
>   block.storage_device = '/org/freedesktop/Hal/devices/block_8_0'  (string)
>   storage.physical_device = '/org/freedesktop/Hal/devices/usb_usb_device_57b_0_501_-1_noserial_0'  (string)
>   storage.vendor = 'Y-E DATA'  (string)
>   storage.model = 'USB-FDU'  (string)
>   storage.automount_enabled_hint = true  (bool)
>   storage.no_partitions_hint = true  (bool)
>   storage.media_check_enabled = true  (bool)
>   storage.bus = 'usb'  (string)
>   block.minor = 0  (0x0)  (int)
>   block.major = 8  (0x8)  (int)
>   info.capabilities = 'block storage'  (string)
>   info.category = 'storage'  (string)
>   info.parent = '/org/freedesktop/Hal/devices/scsi_16_0_0_0'  (string)
>   block.device = '/dev/sda'  (string)
>   block.is_volume = false  (bool)
>   block.have_scanned = true  (bool)
>   block.no_partitions = true  (bool)
>   linux.sysfs_path_device = '/sys/block/sda'  (string)
>   linux.sysfs_path = '/sys/block/sda'  (string)
>   info.bus = 'block'  (string)
> 
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