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CVSID:$Id$
This document is the TODO list for the HAL project. Feel free to add/remove
entries if you get an idea or implement one of these.
- Add support for removal of class devices - we should probably remove
the properties merged and send out a d-bus signal; see comments in
hald/linux/osspec.c:remove_class_device(). This can now easily be tested
with modprobe and rmmod on the sg kernel module
- Persistent device store
Device should be persistent (e.g. saved in a file) so i) we don't need
to check fdi files each and every time we start up; and ii) device
properties are persistent across time
- How this should be implemented should probably be discussed on the
mailing list; one way is to use a binary format (performance), another
way is to use a human-readable file (maybe even, ugh, xml). I personally
opt the the binary format
- There should be a commandline tool for the administrator to easily
purge the database
- We still need to scan all devices at startup; most of the logic is
already implemented but it's a bit tricky to figure out.
- Support for more bus-devices and class-devices
- Testing framework; probably only feasible for non-os specific code, e.g.
the whole device and device store framework
- Support for more filesystem sniffing and volume label extraction
(see hald/linux/block_class_device.c:detect_fs)
- Caching in libhal; the API is ready for it. Remember you cannot use
glib or other dependencies; we can only depend on libc and dbus!
- Property access control and per-user properties
Non-root users should only have read-access to the devices except
in properties where the key starts with 'user.'. Also properties
starting with 'user.' should be per-user (and per-box, e.g. don't
save them in a dotfile or dotdirectory in the users homedir; see TODO
item for persistent device store)
- Support for signed fdi files
One way to implement this is using an existing PKI framework.
There should be an easy way to sign an .fdi file e.g. a hal-sign-fdi
tool. There should also be a directory where vendors can easily
drop the public key.
Also, we should probably consider emitting a dbus-signal or setting
a property so desktop environments can figure display an appropriate
dialog with the .fdi file is unsigned. Probably needs discussion on the
mailling list.
- Callouts should listen for SIGCHLD and send a byte over a pipe which
is watched with a GIOChannel instead of using a 250ms timeout like
we do now.
- Callouts are currently called in order, so if a callout hangs then
no others will be called. There should be a timeout which kills the
callout after a certain period of time. (5 seconds? 10? 15?)
- Wait for callouts to complete before removing a device
- Don't remove a device before all the children are removed
Issues with Linux kernel 2.6.*:
- The ide%d, parent of IDE devices, are no under /sys/bus or /sys/class.
In HAL we call it ide_host
- 16-bit PCMCIA devices (e.g. not CardBus) is not in sysfs
- It would be nice if the kernel could poll for media by itself; right
now we poll for media in hald/linux/block_class_device.c:detect_media
- The ide_cs driver for PCMCIA card readers has a bug where it removes
and inserts the block device when we do a simple readonly open on the
top block device (to poll for media)
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