Running and output

Output text from recipes

Use the self.output attribute to output text from the recipes. Do not use Python’s print() function. The self.output attribute has the following methods to express the level of the printed message:

trace(msg)
debug(msg)
verbose(msg)
status(msg)
info(msg)
highlight(msg)
success(msg)
warning(msg)
error(msg)

These output functions will only output if the verbosity level with which Conan was launched is the same or higher than the message, so running with -vwarning` will output calls to ``warning() and error(), but not info() (Additionally, the highlight() and success() methods have a -vnotice verbosity level)

Note that these methods return the output object again, so that you can chain output calls if needed.

Running commands

run(self, command, stdout=None, cwd=None, ignore_errors=False, env="", quiet=False, shell=True, scope="build")

self.run() is a helper to run system commands while injecting the calls to activate the appropriate environment, and throw exceptions when errors occur so that command errors do not pass unnoticed. It also wraps the commands with the results of the command wrapper plugin.

• command should be specified as a string which is passed to the system shell.
• When the argument quiet is set to true, the invocation of self.run() will not print the command to be executed.