On Sat, Jan 30, 2010 at 10:16 PM, Dr. David Kirkby <david.kir...@onetel.net
> wrote:
Starting to build Sage, then finding the python builds, but finds to
find
the hashlib module is a bit irritating. There is is a specific test
for this
in spkg-install.
-------------------------
# Make sure sufficient crypto support is available in the built
python.
# This is critical.
python -c "import hashlib"
if [ $? -eq 0 -a -f "$SAGE_LOCAL/bin/python" ]; then
echo "hashlib module imported"
exit 0
else
echo "hashlib module failed to import"
exit 1
fi
-----------------------------
Faillure to build the haslib module results from a failure to find
the SSL
libraries. Would it not be more sensible to check for these in
prereq, then
exit if they are not found. It would save someone getting half a
build.
This may have been true at one point, but looking at the current
Python sources [0,1] it seems that Python provides native
implementations of hashlib if OpenSSL is not found, so import hashlib
should never fail (#7761 was an artifact that *no* distutils
extensions built...). What might be more of an issue is _ssl not
building [2], which may be easier to fix (especially if we don't use
any parts of _ssl that gnutls doesn't support). I'm not sure why this
ticket was closed without resolving that issue. OTOH, I'm doubtful we
use _ssl anywhere except for the notebook, as it is all about secure
sockets. Gnutls claims to have support for twisted.
Of course I'm just jumping into the issue now, so there is probably a
lot of history, and pragmatic background of how stuff actually works,
that I'm missing. But can anyone verify that we actually even require
OpenSSL (which is the running assumption)?
- Robert
[0] http://svn.python.org/view/python/branches/release26-maint/setup.py?revision=77865&view=markup
# search for _hashlib
[1]
http://svn.python.org/view/python/branches/release26-maint/Lib/hashlib.py?view=markup
[2] http://trac.sagemath.org/sage_trac/ticket/6359#comment:13
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