[Bug 2065037] Re: dhcpcd is called before interfaces have carrier causing a 29 seconds boot delay

[Benjamin Drung]

Can you add following function to /usr/share/initramfs-
tools/scripts/functions:

```
log_flags() {
    for device in /sys/class/net/*; do
        echo "*** flags for $device";
        if [ -f "${device}/flags" ]; then
            cat "${device}/flags";
        fi;
    done
}
```

Please call this function in configure_networking at several places:
* at the beginning of configure_networking
* before the _update_ip_param call
* after the "wait_for_udev 10" call
* after "for ROUNDTTT in 30 60 90 120; do" (so at the beginning of the loop)

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https://bugs.launchpad.net/bugs/2065037

Title:
  dhcpcd is called before interfaces have carrier causing a 29 seconds
  boot delay

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  In automatically encrypted Clevis+Tang unlock of LUKS encrypted device
  (dmcrypt/cryptsetup) - on top of which the ZFS Pool for / resides,
  dhcpcd is used in order to obtain automatically an IP address during
  initramfs boot.

  During this phase, dhcpcd is called before interfaces have carrier
  causing a 29 seconds boot delay.

  Boot delay is currently 45 seconds, instead of the 15 seconds that it
  should.

  BUG Initially reported in:
  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/2064926

  Relevant Logs:
  ```
  dhcpcd-10.0.6 starting
  [...]
  no interfaces have a carrier
  exiting due to oneshot
  dhcpcd exited
  Sleeping 29 seconds before retrying getting a DHCP lease
  dhcpcd-10.0.6 starting
  ```

  A possible workaround would be to manually edit /usr/share/initramfs-tools/scripts/functions
  Changing this:
  `for ROUNDTTT in 30 60 90 120; do`

  To this:
  `for ROUNDTTT in 5 5 5 5; do`

  But the proper solution would be to continuously "scan" the state of
  the Interface (every Second or so), and wait until the interface is
  UP, before deciding to call dhcpcd.

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