[Bug 1840965] Re: dhclient initramfs code writes invalid net-eth0.conf

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

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

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https://bugs.launchpad.net/bugs/1840965

Title:
  dhclient initramfs code writes invalid net-eth0.conf

Status in initramfs-tools package in Ubuntu:
  Confirmed
Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in initramfs-tools source package in Eoan:
  Confirmed
Status in isc-dhcp source package in Eoan:
  Fix Released

Bug description:
  Since 18.10, Ubuntu switched to using dhclient instead of ipconfig in initramfs configure_networking(). And now a malformed /run/net-enp0s3.conf is generated, with unquoted values like the following, which are a shell syntax error:
  IPV4DNS0=1.2.3.1 1.2.3.2 1.2.3.3

  This file is sourced by initramfs-tools/init in various places, and produces the following message a lot of times:
  /init: /run/net-enp0s3.conf: line 8: 1.2.3.2: not found

  I.e. values should be quoted, and 2 DNS entries should go in
  IPV4DNS0/IPV4DNS1, not multiple unquoted ones in IPV4DNS0.

  Here is the erroneous file that dhclient-enter-hooks.d/config produces:
  DEVICE=enp0s3
  PROTO=dhcp
  IPV4PROTO=dhcp
  IPV4ADDR=10.161.254.38
  IPV4NETMASK=255.255.255.0
  IPV4BROADCAST=10.161.254.255
  IPV4GATEWAY=10.161.254.1
  IPV4DNS0=194.63.237.4 194.63.239.164 194.63.238.4
  ROOTSERVER=10.161.254.1
  HOSTNAME=
  DNSDOMAIN=

  Here is the correct one that ipconfig produces:
  DEVICE='enp0s3'
  PROTO='dhcp'
  IPV4ADDR='10.161.254.38'
  IPV4BROADCAST='10.161.254.255'
  IPV4NETMASK='255.255.255.0'
  IPV4GATEWAY='10.161.254.1'
  IPV4DNS0='194.63.237.4'
  IPV4DNS1='194.63.239.164'
  HOSTNAME=''
  DNSDOMAIN=''
  NISDOMAIN=''
  ROOTSERVER='10.161.254.1'
  ROOTPATH=''
  filename=''
  UPTIME='594'
  DHCPLEASETIME='25200'
  DOMAINSEARCH=''

  I.e. please either fix dhclient-enter-hooks.d/config, or revert the
  ipconfig => dhclient change.

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