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Python interpreter discovery (#50163)

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* Python interpreter discovery

* No longer blindly default to only `/usr/bin/python`
* `ansible_python_interpreter` defaults to `auto_legacy`, which will discover the platform Python interpreter on some platforms (but still favor `/usr/bin/python` if present for backward compatibility). Use `auto` to always use the discovered interpreter, append `_silent` to either value to suppress warnings.
* includes new doc utility method `get_versioned_doclink` to generate a major.minor versioned doclink against docs.ansible.com (or some other config-overridden URL)

* docs revisions for python interpreter discovery

(cherry picked from commit 5b53c0012ab7212304c28fdd24cb33fd8ff755c2)

* verify output on some distros, cleanup
This commit is contained in:
Matt Davis 2019-02-27 23:52:02 -08:00 • committed by GitHub
parent b8a82f5930
commit 4d3a6123d5
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20 changed files with 759 additions and 28 deletions
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41
lib/ansible/executor/module_common.py
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@ -34,6 +34,7 @@ from io import BytesIO
from ansible.release import __version__, __author__
from ansible import constants as C
from ansible.errors import AnsibleError
from ansible.executor.interpreter_discovery import InterpreterDiscoveryRequiredError
from ansible.executor.powershell import module_manifest as ps_manifest
from ansible.module_utils._text import to_bytes, to_text, to_native
from ansible.plugins.loader import module_utils_loader
@ -459,18 +460,46 @@ def _get_shebang(interpreter, task_vars, templar, args=tuple()):
file rather than trust that we reformatted what they already have
correctly.
"""
interpreter_config = u'ansible_%s_interpreter' % os.path.basename(interpreter).strip()
interpreter_name = os.path.basename(interpreter).strip()
if interpreter_config not in task_vars:
return (None, interpreter)
# FUTURE: add logical equivalence for python3 in the case of py3-only modules
interpreter = templar.template(task_vars[interpreter_config].strip())
shebang = u'#!' + interpreter
# check for first-class interpreter config
interpreter_config_key = "INTERPRETER_%s" % interpreter_name.upper()
if C.config.get_configuration_definitions().get(interpreter_config_key):
# a config def exists for this interpreter type; consult config for the value
interpreter_out = C.config.get_config_value(interpreter_config_key, variables=task_vars)
discovered_interpreter_config = u'discovered_interpreter_%s' % interpreter_name
interpreter_out = templar.template(interpreter_out.strip())
facts_from_task_vars = task_vars.get('ansible_facts', {})
# handle interpreter discovery if requested
if interpreter_out in ['auto', 'auto_legacy', 'auto_silent', 'auto_legacy_silent']:
if discovered_interpreter_config not in facts_from_task_vars:
# interpreter discovery is desired, but has not been run for this host
raise InterpreterDiscoveryRequiredError("interpreter discovery needed",
interpreter_name=interpreter_name,
discovery_mode=interpreter_out)
else:
interpreter_out = facts_from_task_vars[discovered_interpreter_config]
else:
# a config def does not exist for this interpreter type; consult vars for a possible direct override
interpreter_config = u'ansible_%s_interpreter' % interpreter_name
if interpreter_config not in task_vars:
return None, interpreter
interpreter_out = templar.template(task_vars[interpreter_config].strip())
shebang = u'#!' + interpreter_out
if args:
shebang = shebang + u' ' + u' '.join(args)
return (shebang, interpreter)
return shebang, interpreter_out
def recursive_finder(name, data, py_module_names, py_module_cache, zf):