Re: Moving a Plone installation

Wolfgang Jeltsch <[email protected]> writes:
> ...
> Since I assumed that the Plone installation is basically self-contained
> (modulo a few external utilities like zlib), I thought that this
> approach should work. However, when trying to run the Plone
> installation, I got the error, “ImportError: No module named _md5”. What
> is the cause of this, and how can I fix this problem?

When a module name starts with "_" this is often an indication that
it is implemented in "C", i.e. some kind of a Python extension.

As you have copied your (hopefully) complete Python installation,
the "_md5" should not have disappeared. However, it may have
a dependency on a shared object which is no longer installed in
your new operating system version.

To verify, I would search for the "_md5" module file
(e.g. via the "locate" utility, if available on your system).
It might be "_md5.so" or "_md5module.so"). Then apply "ldd <module file>"
to learn which shared objects it depends on.


In modern Python versions, the MD5 algorithm is no longer
implemented in its own module ("_md5") but instead the one
provided by "OpenSSL" is used (interfaced via the "hashlib"
module ("_hashlib.so"). "_md5" is only imported when
the available "OpenSSL" installation lacks "MD5" support.
Thus, your problem may also indicate some "OpenSSL" problem -- e.g.
a version problem between your Python's "_hashlib" and the OS
OpenSSL shared object).

In this case, I would modernize the Python installation
used by your Plone. In the list archive (searchable e.g.
via "gmane") you will find advice how to do that.


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