crucial

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• django has two classes called ValidationError

  There is one in django.core.exceptions and one in django.forms.util Using that space age IDE Eclipse I have to say I'm enjoying how much time I've saved just going shift-command-O to organize and resolve all of my imports.  But today I've just lost a few hours due to my ok-ing the wrong class. Quite mysterious it was, I raised a ValidationError (core exceptions one) in my form's clean() and watched as the try: except ValidationError: in django's full_clean() completely ignored my ...

• GDAL fails to build: `.rodata' can not be used when making a shared object; recompile with -fPIC

    libtool: link: g++ -shared -nostdlib /usr/lib/gcc/x86_64-linux-gnu/4.4.1/../../../../lib/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.4.1/crtbeginS.o .libs/libgdal.la.lnkscript  -L/usr/local/lib /usr/local/lib/libgeos_c.so /usr/local/lib/libgeos.so /usr/local/lib/libexpat.so -L/usr/lib -lpq -lrt -ldl /usr/lib/libcurl.so -lssl -lcrypto -lz -L/usr/lib/gcc/x86_64-linux-gnu/4.4.1 -L/usr/lib/gcc/x86_64-linux-gnu/4.4.1/../../../../lib -L/lib/../lib -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.4.1/../../.. -lstdc++ -lm -lc -lgcc_s /usr/lib/gcc/x86_64-linux-gnu/4.4.1/crtendS.o /usr/lib/gcc/x86_64-linux-gnu/4.4.1/../../../../lib/crtn.o         -Wl,-soname -Wl,libgdal.so.1 -o .libs/libgdal.so.1.13.2 /usr/bin/ld: /usr/local/lib/libz.a(crc32.o): relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC /usr/local/lib/libz.a: could not read symbols: Bad value collect2: ld returned 1 exit status make[1]: *** [libgdal.la] Error 1 make[1]: Leaving directory `/home/crucial/tmp/gdal-1.6.2' ...

• installing MySQLdb on Ubuntu (mysql-python)

  MySQLdb is the python support bindings for MySQL.  Not that the name would lead you to beleive that. Its sourceforge page calls it http://sourceforge.net/projects/mysql-python/ which makes more sense. you need setuptools, which you usually already have:     sudo aptitude install python-setuptools You need MySQL-devel to compile, but its not called that, its called: libmysql++-dev on Ubuntu     sudo apt-get install libmysql++-dev download MySQLdb itself from:     http://sourceforge.net/projects/mysql-python/     # the version you download will be more recent     tar xfz ...

• postgres login as admin user postgres

  When installing postgres a user will be created named 'postgres' with a password of '!!' which means "cannot login".  But yet you need to login as that in order to run psql (the postgres db shell) to create other users and to create database templates. The solution is to first log yourself in as root (in your normal shell): su root (enter password...) then you will no longer be subject to password checks and you can login in as user ...

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