Обсуждение: PL/Python
Our machine is running: Python 2.2 (#1, Feb 24 2002, 16:21:58) [GCC 2.96 20000731 (Mandrake Linux 8.2 2.96-0.76mdk)] on linux-i386 Our Postgres source is from ftp.postgresql.org[64.49.215.8]:21 (via 'wget'): -rw-r--r-- 1 postgres postgres 9239158 Aug 22 23:25 postgresql-7.2.2.tar.gz We had to get the Python 2.2.1 source and fiddle with Postgres' makefile '-I' statement (in the appropriate place, we think) to point to the Python headers, but everything seemed to build and install OK after that. We brought up postmaster, added 'plpgsql' to 'template1', no problem. However, when we try to add 'plpython': [postgres@linuxbox postgres]$ /usr/local/pgsql/bin/createlang plpython template1 ERROR: Load of file /usr/local/pgsql/lib/plpython.so failed: /usr/local/pgsql/lib/plpython.so: undefined symbol: PyExc_IOError ERROR: Load of file /usr/local/pgsql/lib/plpython.so failed: /usr/local/pgsql/lib/plpython.so: undefined symbol: PyExc_IOError createlang: language installation failed We noticed 'libplpython.so' in 'src/pl/plpython', so we set 'LD_LIBRARY_PATH' - same error. We also added '/usr/lib/' (libpython2.2.so.0.0 is there) to LD_LIBRARY_PATH - no change. We *love* Python, and think it will be ideal for a good number of our stored procedures/functions, and in fact this Postgres installation is to support a Zope application we are currently developing/using with Postgres 7.2. We (obviously) are not terribly skilled at installing Postgres (though we do usually build from source) - our efforts are directed elsewhere - could someone help us with what is probably a blindingly obvious problem to a Postgres expert? Permissions, perhaps? -- One OS to rule them all, one OS to find them, One OS to bring them all and in the database bind them, In the Land of Redmond, where the Shadows lie.
After some digging in various news groups, we added '-export-dynamic' to link our link flags, and re-built Python *and* Postgres, and re-installed. Result: now we get a different error message when we try to 'createlang plpython': -----( snip )--------------- bash-2.05$ /usr/local/pgsql/bin/createlang plpython template1 ERROR: Load of file /usr/local/pgsql/lib/plpython.so failed: /usr/local/lib/python2.2/config/libpython2.2.so: undefined symbol: openpty createlang: language installation failed -----( snip )--------------- This constitutes progress, right? We are doing this as user 'postgres', which is the user postmaster runs as. If, as user 'postgres', we load python interactively from the command line, we can import module 'pty', and successfully invoke 'openpty()' - it returns: (3, 4). BTW, we have verified that plpython.so was created after libpython2.2.so. Anybody have any ideas? Chris Hall wrote: > Our machine is running: > Python 2.2 (#1, Feb 24 2002, 16:21:58) > [GCC 2.96 20000731 (Mandrake Linux 8.2 2.96-0.76mdk)] on linux-i386 > > Our Postgres source is from ftp.postgresql.org[64.49.215.8]:21 (via > 'wget'): > -rw-r--r-- 1 postgres postgres 9239158 Aug 22 23:25 > postgresql-7.2.2.tar.gz > > We had to get the Python 2.2.1 source and fiddle with Postgres' makefile > '-I' statement (in the appropriate place, we think) to point to the > Python headers, but everything seemed to build and install OK after that. > > We brought up postmaster, added 'plpgsql' to 'template1', no problem. > However, when we try to add 'plpython': > > [postgres@linuxbox postgres]$ /usr/local/pgsql/bin/createlang plpython > template1 > ERROR: Load of file /usr/local/pgsql/lib/plpython.so failed: > /usr/local/pgsql/lib/plpython.so: undefined symbol: PyExc_IOError > ERROR: Load of file /usr/local/pgsql/lib/plpython.so failed: > /usr/local/pgsql/lib/plpython.so: undefined symbol: PyExc_IOError > createlang: language installation failed > > We noticed 'libplpython.so' in 'src/pl/plpython', so we set > 'LD_LIBRARY_PATH' - same error. We also added '/usr/lib/' > (libpython2.2.so.0.0 is there) to LD_LIBRARY_PATH - no change. > > We *love* Python, and think it will be ideal for a good number of our > stored procedures/functions, and in fact this Postgres installation is > to support a Zope application we are currently developing/using with > Postgres 7.2. > > We (obviously) are not terribly skilled at installing Postgres (though > we do usually build from source) - our efforts are directed elsewhere - > could someone help us with what is probably a blindingly obvious problem > to a Postgres expert? > > Permissions, perhaps? > -- One OS to rule them all, one OS to find them, One OS to bring them all and in the database bind them, In the Land of Redmond, where the Shadows lie.
Chris Hall <hall.cj@verizon.net> writes:
> bash-2.05$ /usr/local/pgsql/bin/createlang plpython template1
> ERROR: Load of file /usr/local/pgsql/lib/plpython.so failed:
> /usr/local/lib/python2.2/config/libpython2.2.so: undefined symbol: openpty
> createlang: language installation failed
What shared library provides openpty() on your system? Is that library
in the dynamic loader's search path?
It might be useful to do
ldd /usr/local/lib/python2.2/config/libpython2.2.so
and see how the library's shared-library references get resolved.
regards, tom lane
Thanks for the response! We have been involved in production 'issues' today, sorry I didn't get back on this sooner (plus we are on Hawaiian time). (3 hours later - the first response bounced at Verizon's outgoing mail server, for some reason). 'openpty' is a function defined in a Python library module 'pty'. I'm not sure how the load mechanism would work, I guess it's time for me to 'use the source!'? BTW, bash-2.05$ ldd /usr/local/pgsql/lib/plpython.so libpython2.2.so => /usr/local/lib/libpython2.2.so (0x4000a000) libc.so.6 => /lib/libc.so.6 (0x400f8000) /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000) and, bash-2.05$ ldd /usr/local/lib/libpython2.2.so libc.so.6 => /lib/libc.so.6 (0x400ee000) /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000) Doesn't seem overly helpful in this case, except to maybe eliminate an avenue of inquiry? Thanks again, Tom. Chris Hall Tom Lane wrote: >Chris Hall <hall.cj@verizon.net> writes: > > >>bash-2.05$ /usr/local/pgsql/bin/createlang plpython template1 >>ERROR: Load of file /usr/local/pgsql/lib/plpython.so failed: >>/usr/local/lib/python2.2/config/libpython2.2.so: undefined symbol: openpty >>createlang: language installation failed >> >> > >What shared library provides openpty() on your system? Is that library >in the dynamic loader's search path? > >It might be useful to do > ldd /usr/local/lib/python2.2/config/libpython2.2.so >and see how the library's shared-library references get resolved. > > regards, tom lane > > > -- One OS to rule them all, one OS to find them, One OS to bring them all and in the database bind them, In the Land of Redmond, where the Shadows lie.