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  • From: Ismael Luceno <ismael.luceno AT gmail.com>
  • To: sm-discuss AT lists.ibiblio.org
  • Subject: [SM-Discuss] [RFC] Compressed filetype detection (Bug #16011)
  • Date: Sat, 14 May 2016 16:12:34 -0300

Dear fellow mages,

Bug #16011 [0], recently filled, deals with the issue of upgrading
an old system to the latest stable releases.

Since a while ago, some of the sources of spells in stable are
compressed by xz, but this format is not recognized by older versions
of the `file` command, which sorcery uses to figure out how to
decompress the file.

As a first measure to avoid this issue now and in future releases, I
would like to replace the code dealing with parsing the output of the
`file` command with a custom script that detects only the formats
needed by sorcery, and has no external dependencies. A prototype
written using only dd and awk is attached to the bug report [1].

I would like to hear opinions about this implementation and any ideas
about how it could be improved.

Regards.


[0] https://bugs.sourcemage.org/show_bug.cgi?id=16011
[1] https://bugs.sourcemage.org/attachment.cgi?id=7584




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