[Bug 1328285] Re: can not find hardware address

[Steve Langasek]

<slangasek> stgraber: do you know a proper way to programmatically get a list of all network interfaces on a system, including those that are currently down?  http://linux.die.net/man/7/netdevice documents that SIOCGIFCONF doesn't include down interfaces, and recommends /proc/net/dev instead
<stgraber> slangasek: I usually iterate through /sys/class/net which works fine if you just want a list or want physical interface related kind of information. If you need to query the interface configuration, then you need getifaddrs and it's a whole other kind of worm (also, some most IPv6 info is also in /proc, but ipv4 isn't... yay for consistency)
<slangasek> stgraber: context is whoopsie trying to get a mac address to use as a system identifier; this shouldn't be dependent on network interfaces being up
<stgraber> slangasek: /sys/class/net/*/address will get you that
<stgraber> slangasek: if you want to make sure you've got an ethernet device (and therefore a MAC), check that /type == 1 too

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https://bugs.launchpad.net/bugs/1328285

Title:
  can not find hardware address

Status in “whoopsie” package in Ubuntu:
  Triaged

Bug description:
  Working with popey, trying to figure out why his crashes weren't
  reported.

  Jun  9 22:24:28 ubuntu-phablet whoopsie[1934]: whoopsie 0.2.30 starting up.
  Jun  9 22:24:28 ubuntu-phablet whoopsie[1934]: Unable to find a hardware address
  Jun  9 22:24:28 ubuntu-phablet whoopsie[1934]: Using lock path: /var/lock/whoopsie/lock
  Jun  9 22:24:29 ubuntu-phablet whoopsie[1953]: offline
  Jun  9 22:24:33 ubuntu-phablet whoopsie[1953]: message repeated 3 times: [ offline]
  Jun  9 22:24:33 ubuntu-phablet whoopsie[1953]: online
  Jun  9 22:24:34 ubuntu-phablet whoopsie[1953]: online
  Jun  9 22:25:10 ubuntu-phablet whoopsie[1953]: offline
  Jun  9 22:25:13 ubuntu-phablet whoopsie[1953]: message repeated 2 times: [ offline]
  Jun  9 22:25:13 ubuntu-phablet whoopsie[1953]: online

  Notice the "unable to find a hardware address".  Ted suggests:

  14:51 < tedg> bdmurray, I imagine that is because it can't 
                find oFono. Perhaps the upstart jobs need to 
                be adjusted so it doesn't start until after 
                oFono is up.

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