[Bug 1849608] Re: systemd resolv should separate the output of stdout and stderr

[Łukasz Zemczak]

Hello Steven, or anyone else affected,

Accepted systemd into eoan-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/systemd/242-7ubuntu3.2
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-eoan to verification-done-eoan. If it does not fix
the bug for you, please add a comment stating that, and change the tag
to verification-failed-eoan. In either case, without details of your
testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: systemd (Ubuntu Eoan)
       Status: Confirmed => Fix Committed

** Tags added: verification-needed verification-needed-eoan

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https://bugs.launchpad.net/bugs/1849608

Title:
  systemd resolv should separate the output of stdout and stderr

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Eoan:
  Fix Committed
Status in systemd source package in Focal:
  Fix Released

Bug description:
  [impact]

  dhclient fails to notify resolved about DNS servers due to bash-
  specific redirect inside 'resolved' hook script

  [test case]

  see original description below

  [regression potential]

  any regression would likely cause resolved not to be aware of
  dhclient-provided dns servers

  [other info]

  This is needed only in Eoan and later; X/B/D do not have the bash-
  specific redirect '&>' in their hook file.

  original description:
  ---

  
  The file /etc/dhcp/dhclient-enter-hooks.d/resolved
  provided by systemd (242-7ubuntu3) causes the dhclient failing to get DNS due to systemd-resolved is not run.
  This issue can be reproduced on Ubuntu Eoan:
  ==============================
  root at eoan:~# dhclient -v
  Internet Systems Consortium DHCP Client 4.4.1
  Copyright 2004-2018 Internet Systems Consortium.
  All rights reserved.
  For info, please visit https://www.isc.org/software/dhcp/

  Listening on LPF/ens224/00:0c:29:92:d4:da
  Sending on   LPF/ens224/00:0c:29:92:d4:da
  Listening on LPF/ens192/00:0c:29:92:d4:d0
  Sending on   LPF/ens192/00:0c:29:92:d4:d0
  Listening on LPF/ens160/00:0c:29:92:d4:c6
  Sending on   LPF/ens160/00:0c:29:92:d4:c6
  Sending on   Socket/fallback
  DHCPDISCOVER on ens224 to 255.255.255.255 port 67 interval 3 (xid=0x6d9fb33d)
  DHCPDISCOVER on ens192 to 255.255.255.255 port 67 interval 3 (xid=0xeb8fda26)
  DHCPREQUEST for 192.168.120.4 on ens160 to 255.255.255.255 port 67 (xid=0x6d39545d)
  DHCPACK of 192.168.120.4 from 192.168.120.254 (xid=0x5d54396d)
  RTNETLINK answers: File exists
  d41d8cd98f00b204e9800998ecf8427e  /run/systemd/resolved.conf.d/isc-dhcp-v4-ens160.conf
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v6-ens160.conf: No such file or directory
  5025823d750dda1f3f15e306c4a0afce  /run/systemd/resolved.conf.d/isc-dhcp-v4-ens160.conf
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v6-ens160.conf: No such file or directory
  bound to 192.168.120.4 -- renewal in 111 seconds.
  root at eoan:~# resolvectl status |grep DNS
  MulticastDNS setting: no
    DNSOverTLS setting: no
        DNSSEC setting: no
      DNSSEC supported: no
            DNSSEC NTA: 10.in-addr.arpa
  MulticastDNS setting: no
    DNSOverTLS setting: no
        DNSSEC setting: no
      DNSSEC supported: no
  MulticastDNS setting: no
    DNSOverTLS setting: no
        DNSSEC setting: no
      DNSSEC supported: no
  MulticastDNS setting: no
    DNSOverTLS setting: no
        DNSSEC setting: no
      DNSSEC supported: no
  ==============================

  Attached please find the patch for this. The output for md5sum in the
  hook file resolv should separate the stdout and stderr so it won't
  compare the wrong data.

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