[Bug 2058628] Re: initramfs-tools dhcpcd timeout

[Benjamin Drung]

initramfs-tools 0.142ubuntu23 landed in noble.

** Changed in: initramfs-tools (Ubuntu)
       Status: Fix Committed => Confirmed

** Changed in: initramfs-tools (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/2058628

Title:
  initramfs-tools dhcpcd timeout

Status in initramfs-tools package in Ubuntu:
  Fix Released

Bug description:
  Hi,

  We found an issue in `initramfs-tools-core` (noble,now 0.142ubuntu20
  all) related to this change :
  https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/2024164
  (dhclient replaced by dhcpcd).

  dhclient was faster to give an IP. In the `initramfs-tools-core`
  scripts, in **/usr/share/initramfs-tools/scripts/functions**, the
  ROUNDTTT iterations at _2, 3, 4 or even 6 seconds_ fail. This delays
  obtaining an IPv4 by at least 20 seconds.

  
  ```
  # support ip options see linux sources
  # Documentation/filesystems/nfs/nfsroot.txt
  # Documentation/frv/booting.txt

  for ROUNDTTT in 2 3 4 6 9 16 25 36 64 100; do
          local iter_entry_time iter_exit_time

          iter_entry_time=$(time_elapsed)

          if [ -z "${DEVICE}" ]; then
                  _set_available_devices_to_up
          fi

          case ${IP} in
          none|done|off)
                  # Do nothing
                  IP="done"
                  ;;
          ""|on|any|dhcp|bootp|both)
                  dhcpcd -1 -t $ROUNDTTT -4 ${DEVICE:+"${DEVICE}"}
                  ;;
          *)
                  ipconfig -t ${ROUNDTTT} -d "$IP"
  ```

  dhcpcd takes at least 5/6 seconds to give an ipv4 because of the arp
  probbing to check that the ip is not already in use.

  **Possible Fixes**: `dhcpcd --noarp` prevents waiting, otherwise
  redistribute the ROUNDTTT iterations by deleting the iterations at 2 3
  4 or even 6 seconds.

  NB: this problem probably only concerns obtaining an IP in IPv4, I
  have not checked if the problem also arises in IPv6.

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