[Bug 764096] Re: DNS hostname lookups fail in chroot after natty upgrade

[Steve Langasek]

** Description changed:

+ SRU justification: the postfix package in natty runs in a chroot by
+ default, but does not know to copy nss modules from the multiarch
+ library paths to set up the chroot.  As a result, various sorts of NSS
+ resolution, such as mapping port names to numbers or resolving the
+ hostnames of incoming connections, will fail.  This will break postfix
+ in various common configurations.
+ 
+ TEST CASE:
+ 1. install postfix and configure it to use a smart host, specifying only a hostname (no port) for the smart host.
+ 2. verify that there is no /var/spool/postfix/lib/<triplet> directory.
+ 3. send mail and verify that the mail delivery fails because postfix can't resolve 'smtp' to a port number.
+ 4. upgrade postfix to the SRU version
+ 5. verify that after upgrade, there is a /var/spool/postfix/lib/<triplet> directory
+ 6. send mail and verify that it now can be sent to the smarthost successfully.
+ 
+ Risk of regression: if I've done something wrong and the tar command
+ fails under certain conditions, postfix will fail to start.
+ 
  Binary package hint: postfix
  
  I haven't yet determined the cause of this, but after upgrading to natty
  from maverick, postfix smtpd DNS lookups always fail when running in
  chroot (which is the default). This can be seen by lines like
  "postfix/smtpd[12287]: connect from unknown" in mail.log, where unknown
  should be the hostname. After editing master.cf so that smtpd is not in
  a chroot, hostname lookups work normally, as can be seen in mail.log.
  
  There were no changes in my configuration other than upgrading from
  maverick to natty. Hostname lookups worked fine in chroot with maverick.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: postfix 2.8.2-1ubuntu1
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  Architecture: i386
  Date: Sun Apr 17 16:46:24 2011
  ProcEnviron:
-  PATH=(custom, user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/sh
+  PATH=(custom, user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/sh
  SourcePackage: postfix
  UpgradeStatus: Upgraded to natty on 2011-04-16 (1 days ago)

** Changed in: postfix (Ubuntu Natty)
       Status: Confirmed => In Progress

** Changed in: postfix (Ubuntu Oneiric)
       Status: Confirmed => In Progress

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https://bugs.launchpad.net/bugs/764096

Title:
  DNS hostname lookups fail in chroot after natty upgrade