qisys.envsetter – controlling environment variables


class qisys.envsetter. EnvSetter ( build_env=None )

A class to manage environment variables Typical usage:

               envsetter = EnvSetter()
envsetter.set_env_var("WITH_SPAM", "ON")
build_env = envsetter.get_build_env()
# build_env is now a *copy* of os.environ, os.environ does
# NOT change
qisys.command.call("cmake", env=build_env)


Notes: * this will work even if cmake was not in %PATH% before,

because we will use build_env when searching for cmake . (see qisys.command.call() documentation)
  • the source_bat() function is useful to use cl.exe and NMake Makefiles . In this case, you have to source vsvarsall.bat .
get_build_env ( )

Returns a dictionary containing the new environment (note that os.environ is preserved)

set_env_var ( variable , value )

Set a new variable

prepend_directory_to_variable ( directory , variable )

Append a new directory to an environment variable containing a list of paths (most of the time PATH, but can be LIBDIR, for instance when using cl.exe) * The path will always be sanitize first

(absolute, native path)
  • No directory will be added twice
  • The variable will be put in upper case on the dictionary on windows.
prepend_to_path ( directory )

Append a directory to PATH environment variable

source_bat ( bat_file )

Set environment variables using a .bat script Note: right now, this only works well with vcvarsall.bat scripts.

read_config ( qibuild_cfg )

Read a qibuild.config.QiBuildConfig instance