2.5.11.49. SetPropertyFromCommand¶

class buildbot.steps.shell.SetPropertyFromCommand¶

Note

This step is being migrated to new-style. A new-style equivalent is provided as SetPropertyFromCommand. This should be inherited by any custom steps until Buildbot 3.0 is released. Regular uses without inheritance are not affected.

This buildstep is similar to ShellCommand, except that it captures the output of the command into a property. It is usually used like this:

from buildbot.plugins import steps

f.addStep(steps.SetPropertyFromCommand(command="uname -a", property="uname"))

This runs uname -a and captures its stdout, stripped of leading and trailing whitespace, in the property uname. To avoid stripping, add strip=False.

The property argument can be specified as an Interpolate object, allowing the property name to be built from other property values.

Passing includeStdout=False (defaults to True) stops capture from stdout.

Passing includeStderr=True (defaults to False) allows capture from stderr.

The more advanced usage allows you to specify a function to extract properties from the command output. Here you can use regular expressions, string interpolation, or whatever you would like. In this form, extract_fn should be passed, and not Property. The extract_fn function is called with three arguments: the exit status of the command, its standard output as a string, and its standard error as a string. It should return a dictionary containing all new properties.

Note that passing in extract_fn will set includeStderr to True.

def glob2list(rc, stdout, stderr):
    jpgs = [l.strip() for l in stdout.split('\n')]
    return {'jpgs': jpgs}

f.addStep(SetPropertyFromCommand(command="ls -1 *.jpg", extract_fn=glob2list))

Note that any ordering relationship of the contents of stdout and stderr is lost. For example, given:

f.addStep(SetPropertyFromCommand(
    command="echo output1; echo error >&2; echo output2",
    extract_fn=my_extract))

Then my_extract will see stdout="output1\noutput2\n" and stderr="error\n".

Avoid using the extract_fn form of this step with commands that produce a great deal of output, as the output is buffered in memory until complete.