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

[Stefano]

Public bug reported:

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.

** Affects: dhcpcd (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "initramfs_v4.debug"
   https://bugs.launchpad.net/bugs/2065037/+attachment/5775838/+files/initramfs_v4.debug

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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 dhcpcd 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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