F21 System Wide Change: lbzip2 as default bzip2 implementation
al.dunsmuir at sympatico.ca
Wed Apr 2 21:14:53 UTC 2014
On Wednesday, April 2, 2014, 4:27:55 PM, Zbigniew Jędrzejewski-Szmek wrote:
>> ** possibly adjust spec files to require or build-require lbzip2 instead of
> Is this necessary? Wouldn't it be better to have lbzip2 Provide bzip2
> or something so that updating all those packages is not necessary,
> and also that people who prefer normal bzip2 can still use it?
This sounds like a very intrusive change that in the worst case could
introduce errors and expose user data to permanent loss without any
means to recover.
Many tools read and write zip files. The actual ZIP standard format is
controlled by (coordinated by) PKZIP via their application note. There
is a lot of discussion about common extensions, but each tool can have
their own private extensions that may be incompatible.
The InfoZIP team that gives you the zip and unzip tools has added
support for the bzip2 and lzma compression and decompression
algorithms, as well as AES encryption/decryption in their upcoming
beta release. I've been involved in reworking U*IX build support, and
working towards better support on mainframe platforms (z/OS, z/VM) and
AIX. I do all my primary development and testing on Fedora, but others
have their own preferred platform.
This implementation has been built and extensively tested using the
current release of the real bzip2 library. Substituting a completely
different library implementation without going through extensive and
explicit validating and testing is risky and unreasonable. At best, it
would complicate problem reporting, reproduction, analysis and
The libzip effort is not part of the InfoZIP project. They may have
created a wonderful library, but it will not have identical interfaces
and behaviours as the original bzip2 library.
Let the upstream tools decide which bzip implementation(s) to support,
and do the necessary validation to ensure that it all works correctly.
It is the upstream tool's reputation that would be damaged if the
Fedora library caused user data to be lost. Let them do their job
Final gloomy thought of the day: Breaking zip files could you are
breaking the actual tool used for backups. That makes data loss a very
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