[Bug 1889190] Re: ldconfig is still deferred in libc6.preinst

[Balint Reczey]

The bug is not present in Xenial.

The fix is in groovy-proposed, getting closer and closer to the release
pocket.

I could not reproduce the issue without setting LDCONFIG_TRIGGER_DEBUG,
but considering that this is a small fix and helps at least in debugging
IMO backporting it is the right thing. If you disagree I'm open to
dropping it from the SRU.

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https://bugs.launchpad.net/bugs/1889190

Title:
  ldconfig is still deferred in libc6.preinst

Status in glibc package in Ubuntu:
  New
Status in glibc source package in Focal:
  Incomplete

Bug description:
  [Impact]

   * Upgrade from Bionic to Focal may break if LDCONFIG_TRIGGER_DEBUG is set
   * The fix really forces ldconfig to run immediately

  [Test Case]

  $ lxc launch ubuntu:bionic bb-glibc-upgrade
  $ lxc shell bb-glibc-upgrade
  # export LDCONFIG_TRIGGER_DEBUG=1
  #  apt update -qq && apt upgrade -qq -y && do-release-upgrade -d
  ...

  With the broken version the following message can be observed:
  ..
  Preparing to unpack .../libc6_2.31-0ubuntu9_amd64.deb ...

  Progress: [ 38%]
  ldconfig: wrapper deferring update (trigger activated)
  ...

  The fixed version runs ldconfig immediately after unpacking libc6.

  [Regression Potential]

  * Very small, the fix is literally adding one single character to
  properly set LDCONFIG_NOTRIGGER. Running ldconfig immediately as
  originally planned does not seem to cause issues.

  [Other Info]

  Fix:
  --- a/debian/debhelper.in/libc.preinst
  +++ b/debian/debhelper.in/libc.preinst
  @@ -22,7 +22,7 @@ kfreebsd_compare_versions () {
   # libcrypt1 breaks/replaces libc6 (<< 2.31). cannot use a pre-depends on libcrypt1
   # call ldconfig unconditionally for the first libc6 depending on libcrypt1
   if [ -n "$preversion" ] && dpkg --compare-versions "$preversion" lt 2.31-0ubuntu2; then
  -       LCONFIG_NOTRIGGER=y
  +       LDCONFIG_NOTRIGGER=y
          export LDCONFIG_NOTRIGGER
          ldconfig || ldconfig --verbose
   fi

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