kernel modules scanning

[Warren Togami <wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

Seewer mentioned that instmods =block is failing to pull in block device 
drivers on Debian.  Debian lacks the modules.* lists.  The following 
code is used to generate these lists on Fedora.

kernel.spec:
     collect_modules_list()
     {
       sed -r -n -e "s/^([^ ]+) \\.?($2)\$/\\1/p" drivers.undef |
       LC_ALL=C sort -u > $RPM_BUILD_ROOT/lib/modules/$KernelVer/modules.$1
     }

     collect_modules_list networking \
 
'register_netdev|ieee80211_register_hw|usbnet_probe'
     collect_modules_list block \
 
'ata_scsi_ioctl|scsi_add_host|blk_init_queue|register_mtd_blktrans|scsi_esp_register'
     collect_modules_list drm \
                          'drm_open|drm_init'
     collect_modules_list modesetting \
                          'drm_crtc_init'

Under the assumption that we cannot rely on modules.* list files since 
it is not shipped by other distributions, the next best thing is to do a 
similar scanning during dracut runtime.  This is a bit slower than 
simply reading the modules.* files but it seems we have no choice.

I had implemented the equivalent of "modesetting" and the important 
subset of "networking" that we require in dracut.  The equivalent for 
"block" however is a bit more complex given the long list of alternative 
symbol names.

I had considered implementing the equivalent of collect_modules_list in 
dracut.  Perhaps we could implement the equivalent with an additional 
parameter of base directory so it does not bother scanning the entire 
directory tree looking for modules.

Just a thought.

Warren Togami
wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
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