This page describes how to set up python virtualenv. We use virtualenv to simplify upgrades. More to the point, we may need to release an emergency patch to PROD while we are in the middle of upgrading python and django in QA.
Here is the original email from Jeff Frost.
We win!
Here's how I got it to work.
Recreated our virtualenv with --no-site-packages just to be clean (I don't think that was necessary, but just in case):
rm -rf ~/virtualenvs/python27
virtualenv-2.6 --no-site-packages --python=/usr/local/python27/bin/python python27 . ~/virtualenvs/python27/bin/activate
As you recall, we installed gdal-1.8.1 in the virtualenv like so:
./configure --prefix=/home/dev/virtualenvs/python27 --with-python make && make install
Well, this time I installed it without the --with-python option:
./configure --prefix=/home/dev/virtualenvs/python27
make && make install
EDIT: I decided to go back and test after creating a pristine virtualenv, and you don't have to do anything but:
pip-install GDAL==1.8.1
(python27)[dev@easdevweb
python27]$ python Python 2.7.3 (default, May 9 2012, 14:28:18) [GCC
4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2 Type "help", "copyright",
"credits" or "license" for more information.
>>> import gdal
>>>
So,
I think what happened is that allowing access to the site-packages also
allowed access to the other rpaths and thus linked against the wrong
gdal at runtime.
Read on for more interesting info though:
So, how to change the rpath for the python module?
pip install --no-install GDAL==1.8.1
cd build/GDAL/
vim setup.py
Just gotta add some extra_link_args. Here's a diff, so you can see what I
changed:
(python27)[dev@easdevweb GDAL]$ diff setup.py setup.py.orig
165c165
< extra_link_args = ['-Wl,-R/home/dev/virtualenvs/python27/lib']
---
> extra_link_args = []
python setup.py build_ext --gdal-config=gdal-config --library-dirs=/home/dev/virtualenvs/python27/lib
--include-dirs=/home/dev/virtualenvs/python27/include
and voila:
(python27)[dev@easdevweb GDAL]$ ldd
build/lib.linux-x86_64-2.7/osgeo/_gdal_array.so
libgdal.so.1 => /home/dev/virtualenvs/python27/lib/libgdal.so.1
(0x00002ae0b273c000)
libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00002ae0b329e000)
libm.so.6 => /lib64/libm.so.6 (0x00002ae0b359e000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00002ae0b3822000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00002ae0b3a30000)
libc.so.6 => /lib64/libc.so.6 (0x00002ae0b3c4b000)
libgeos_c.so.1 => /usr/local/lib/libgeos_c.so.1 (0x00002ae0b3fa3000)
libsqlite3.so.0 => /usr/lib64/libsqlite3.so.0 (0x00002ae0b41ba000)
libexpat.so.0 => /lib64/libexpat.so.0 (0x00002ae0b4415000)
libpq.so.4 => /usr/lib64/libpq.so.4 (0x00002ae0b4638000)
libz.so.1 => /usr/lib64/libz.so.1 (0x00002ae0b485a000)
librt.so.1 => /lib64/librt.so.1 (0x00002ae0b4a6e000)
libdl.so.2 => /lib64/libdl.so.2 (0x00002ae0b4c78000)
/lib64/ld-linux-x86-64.so.2 (0x00000039f2e00000)
libgeos-3.1.1.so => /usr/local/lib/libgeos-3.1.1.so (0x00002ae0b4e7c000)
libssl.so.6 => /lib64/libssl.so.6 (0x00002ae0b51dd000)
libcrypto.so.6 => /lib64/libcrypto.so.6 (0x00002ae0b5429000)
libkrb5.so.3 => /usr/lib64/libkrb5.so.3 (0x00002ae0b577a000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00002ae0b5a10000)
libresolv.so.2 => /lib64/libresolv.so.2 (0x00002ae0b5c48000)
libnsl.so.1 => /lib64/libnsl.so.1 (0x00002ae0b5e5d000)
libgssapi_krb5.so.2 => /usr/lib64/libgssapi_krb5.so.2 (0x00002ae0b6076000)
libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00002ae0b62a4000)
libk5crypto.so.3 => /usr/lib64/libk5crypto.so.3 (0x00002ae0b64a6000)
libkrb5support.so.0 => /usr/lib64/libkrb5support.so.0 (0x00002ae0b66cc000)
libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00002ae0b68d4000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00002ae0b6ad7000)
libsepol.so.1 => /lib64/libsepol.so.1 (0x00002ae0b6cef000)
python setup.py build_ext --gdal-config=gdal-config --library-dirs=/home/dev/virtualenvs/python27/lib
--include-dirs=/home/dev/virtualenvs/python27/include install
(python27)[dev@easdevweb
site-packages]$ python Python 2.7.3 (default, May 9 2012, 14:28:18)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] on linux2 Type "help",
"copyright", "credits" or "license" for more information.
>>> import gdal
>>>
--
Jeff Frost <jeff@pgexperts.com>
CTO, PostgreSQL Experts, Inc.
Phone: 1-888-PG-EXPRT x506
FAX: 415-762-5122
http://www.pgexperts.com/
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