#329: add md5sums for spkgs
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Reporter: was | Owner: pdenapo
Type: enhancement | Status: new
Priority: minor | Milestone: sage-4.3.3
Component: packages | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by drkirkby):
* milestone: sage-4.3.4 => sage-4.3.3
Comment:
I think the point made by khorton about using gzip is that if the tar file
was gzipped, then gzip would verify the integrity of download, whereas tar
does not.
'md5sum' is not part of POSIX and so you can't assume any 'md5sum' command
will exist. Some systems call it 'md5', others 'md5sum'. On some cut-down
versions of Linux, I doubt any such command would exist.
On Solaris I use
{{{
$ digest -a md5 foobar.c
}}}
('digest' is part of OpenSSL)
One could use 'cksum' instead of md5.
http://www.opengroup.org/onlinepubs/009695399/utilities/cksum.html
That will give the same result on any platform, and will always be called
cksum. It's '''only''' a 32-bit number, so one can not be quite as sure as
with md5 the file is undamaged, but the probability of a file being
corrupted while the output from 'cksum' remains the same is very small.
Note the 'sum' command can not be used, as that is implementation
dependant. But you can be sure cksum will exist on any half-reasonable
operating system and that the output will be portable across all
platforms.
Dave
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/329#comment:7>
Sage <http://www.sagemath.org>
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