[Bug 1878955] Re: resolved dhclient-enter-hook complains about an empty file

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 237-3ubuntu10.44

---------------
systemd (237-3ubuntu10.44) bionic; urgency=medium

  * d/extra/dhclient-enter-resolved-hook:
    suppress output of cmp command in dhclient hook (LP: #1878955)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=c5a2db69aafc7a3ab4e71bae44fd7ad9dd955c97
  * d/p/lp1905044/0001-capability-add-a-way-to-get-a-uint64_t-with-all-caps.patch,
    d/p/lp1905044/0002-test-use-cap_last_cap-for-max-supported-cap-number-n.patch:
    test: use cap_last_cap() instead of capability_list_length()
    (LP: #1905044)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=34ebc6e28e63881d40c91c5839597acc2fdab546
  * d/p/lp1905245/0001-basic-cap-list-parse-print-numerical-capabilities.patch:
    print number of unknown capabilities instead of failing
    (LP: #1905245)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=5ab225b7f731c6cf6b4655cb27c3a842150c4c1a
  * d/p/lp1907306/0001-sd-dhcp-client-don-t-log-timeouts-if-already-expired.patch,
    d/p/lp1907306/0002-sd-dhcp-client-track-dhcp4-t1-t2-expire-times.patch,
    d/p/lp1907306/0003-sd-dhcp-client-add-RFC2131-retransmission-details.patch,
    d/p/lp1907306/0004-sd-dhcp-client-simplify-dhcp4-t1-t2-parsing.patch,
    d/p/lp1907306/0005-sd-dhcp-client-correct-dhcpv4-renew-rebind-retransmi.patch,
    d/p/lp1907306/0008-sd-dhcp-client-fix-renew-rebind-timeout-calculation-.patch:
    Send correct number of dhcpv4 renew and rebind requests
    (LP: #1907306)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=036230cac8232bf4f970e565c355ee1a82fc2ee6
  * d/t/root-unittests:
    Remove any corrupt journal files (LP: #1881947)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=b284b93e40b6cb834bb40dd3db94850853ab5bb8

 -- Dan Streetman <ddstreet at canonical.com>  Wed, 06 Jan 2021 16:04:25
-0500

** Changed in: systemd (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1878955

Title:
  resolved dhclient-enter-hook complains about an empty file

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  Fix Released
Status in systemd source package in Focal:
  Fix Released

Bug description:
  [impact]

  When starting/using `dhclient`, it will often return an error such as:

      cmp: EOF on /tmp/tmp.yCyV6zBzhB which is empty

  [test case]

  run dhclient for the first time (for the current boot) on a
  bionic/focal system, or remove the file(s) in
  /run/systemd/resolved.conf.d/ starting with 'isc-dhcp-*', and then run
  dhclient.

  [regression potential]

  any regression would likely cause the DNS configuration that dhclient
  gets to not be properly reported to systemd-resolved, resulting in
  problematic/broken systemd DNS resolution.

  [scope]

  this is needed in b/f

  this hook was removed from systemd starting in g, and the hook was not
  yet added in x, so this change is needed only in b and f.

  [original description]

  When starting/using `dhclient`, it will often return an error such as:

      cmp: EOF on /tmp/tmp.yCyV6zBzhB which is empty

  This is due to the use of `cmp` in "/etc/dhcp/dhclient-enter-
  hooks.d/resolved"

  Because the $oldstate file can be empty, or different, it should use
  `cmp --quiet`

  This happens when "/run/systemd/resolved.conf.d/isc-
  dhcp-v*-$interface.conf" files do not exist, or when the content
  changes.

  This is very loosely related to
  https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1805183

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