[Bug 1472834] Re: logrotate does not use .xz extension for xz-compressed logs

[Anthony Fok]

If I am reading the logrotate 3.8.7 source code correctly, there is no
mapping table between compresscmd and compressext, and a search for
"xz", "bz" and "lzma" returns no result either.

Indeed, the only compression program that logrotate 3.8.7 knows about is
gzip, and if compressext isn't defined in the config files, the default
COMPRESS_EXT ".gz" is used instead.  There is currently no "smart logic"
to set the correct compressext automatically from compresscmd.

Perhaps this bug is best reported at logrotate's new home on GitHub at
https://github.com/logrotate/logrotate.  AFAICT, the bug still exists in
the latest logrotate 3.9.2.

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https://bugs.launchpad.net/bugs/1472834

Title:
  logrotate does not use .xz extension for xz-compressed logs

Status in logrotate package in Ubuntu:
  Confirmed

Bug description:
  I had an entry in /etc/logrotate.d declared like:

  	compress
  	compresscmd /usr/bin/xz
  	uncompresscmd /usr/bin/unxz

  According to man 5 logrotate.conf, the default extension for
  compressed files ought to be whatever the compresscmd outputs

        compressext
                Specifies  which extension to use on compressed logfiles, if compression is enabled.  The default follows that of the con‐
                figured compression command.

  However, my logs are .gz files, even though when I do run "file" on
  them , it says "XZ compressed data"

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: logrotate 3.8.7-1ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
  Uname: Linux 3.19.0-22-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Jul  8 18:35:41 2015
  InstallationDate: Installed on 2015-03-20 (110 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150320)
  SourcePackage: logrotate
  UpgradeStatus: No upgrade log present (probably fresh install)

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