Hi,
I was trying to create a bit unusual initrd and need to scan
devices for
LVM after they appear. This problem is that LVM tools can't scan just one
device, but always scan all of them.
Well, solution is simple, isn't it? Just run trigger, settle,
vgchange
and you are done... well, you are not. There are no guarantees devices
will be in place when settle returns. It merely indicates empty queue,
that may receive some more items a bit later. So what to do? Hook RUN to
all block devices and run vgchange. Close, but still no good. It's not
nice to scan all devices when one appears, is it?
So... the best approach would IMO be creating /var/.../run-lvm-
please
whenever a block device appears and then, after everything settles run lvm
hook, which in turn triggers new block device found events, that gets
processed... until everything is loaded and quiet.
Plus I can configure network devices as they appear and start iscsi
once
they are up. And I will be busy-waiting in /init[1] until I get root, then
just stop udev, pivot_root and resume event processing.
And the question? How do I run a command every time queue hits 0
items?
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