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discover: Wait for net interfaces to be marked ready
If pb-discover is started before udev has settled there is a race between Petitboot configuring interfaces and udev renaming them. If an interface is set "up" the name change will fail and interfaces can be inconsistently named, eg: Device: (*) eth0 [0c:c4:7a:f4:1c:50, link up] ( ) enP1p9s0f1 [0c:c4:7a:f4:1c:51, link down] ( ) enP1p9s0f2 [0c:c4:7a:f4:1c:52, link down] ( ) enP1p9s0f3 [0c:c4:7a:f4:1c:53, link down] Add "net" devices to the udev filter and wait for them to be announced by udev before configuring them. udev_enumerate_add_match_is_initialized() ensures that by the time an interface appears via udev its name will be consistent. This also swaps the network and udev init order, but since interfaces now will not be configured until after udev is ready this should not have a user-visible effect. Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
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