#329: add md5sums for spkgs
---------------------------+------------------------------------------------
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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Comment(by ddrake):
Replying to [comment:7 drkirkby]:
> One could use 'cksum' instead of md5.
I just experimented with this a bit and it seems like a reasonable idea. I
propose we use cksum, and if someone gets an invalid spkg that passes the
cksum test, we can then think about using something a bit more powerful.
One tiny problem is that cksum on Solaris doesn't produce precisely the
same output as on Linux or OS X; it uses a tab character instead of space.
(Reading the POSIX spec, this seems to be a minor violation; it looks like
you are supposed to use spaces.)
Anyway, we could "normalize" the output by using, say, awk:
{{{
tar stuff | cksum | awk '{print $1, $2}'
}}}
which should print out the two fields separated by a space. That works on
Linux (Ubuntu 8.04 and 9.10), OS X (bsd.math), Solaris (t2.math), and
Cygwin. POSIX says [
http://www.opengroup.org/onlinepubs/009695399/utilities/awk.html default
OFS for awk is a space], so we should be safe.
I propose we use cksum instead of md5sum, along with a bit of awk as
above. While cksum may not be as strong as md5 sums, it does include the
file size, which I suspect would catch a large majority of download
errors. I also propose we standardize the filenames and put
"spkgname.cksum" into the tarball and output to spkgname.computed.cksum
and spkgname.stored.cksum.
Along with the new spkg/md5 (or, I suppose, spkg/cksum) directory proposed
at comment:35:ticket:8306, I think we might have something usable and
workable for this ticket.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/329#comment:8>
Sage <http://www.sagemath.org>
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