[Zope3-dev] Loading and running ZX3 from a zip file
Peter Mayne
PeterMayne at ap.spherion.com
Wed Jan 5 20:31:45 EST 2005
An idle observation...
We're writing an application that will be run from a CD. ZX3 takes a
while to load and start from a CD, so we thought we might use Python's
ability to import from a zip file (PEPs 273 and 302) to cut down the
amount of bytes to be read from the CD.
The first problem is that there are some .pyd files in ZX3, and Python
won't import those. This was solved by using Thomas Heller's
zipextimporter that can import .pyd extensions.
So far so good. However, ZX3 then attempts to open various files,
zope/app/server/schema.xml for instance. Since this file does not exist
on the filesystem (the path in this case is
file://///C|/tmp/zope.zip/zope/app/server/schema.xml), ZX3 can't open
it: end of startup.
After hacking my way through various file opening code replacing
zope.zip in the path with something else, I eventually get to
TypeError: 'zope.security.checker.Checker' object is not callable
which is where I stop. :-)
I'm hesitant to call ZX3's inability to load from a zipe file a bug,
because I don't think such a thing was envisaged. However, is it
something that might be considered for the (possibly distant) future, or
(as I suspect) isn't it worth the trouble? Maybe in the future the PEP
302 __loader__ attribute could be used.
PJDM
--
Peter Mayne
Spherion Technology Solutions
Canberra, ACT, Australia
"I'm after rebellion, I'll settle for lies" - Blue Oyster Cult
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