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import logging
import os
import subprocess
from pip._internal.basecommand import Command
from pip._internal.configuration import Configuration, kinds
from pip._internal.exceptions import PipError
from pip._internal.locations import venv_config_file
from pip._internal.status_codes import ERROR, SUCCESS
from pip._internal.utils.misc import get_prog
logger = logging.getLogger(__name__)
class ConfigurationCommand(Command):
"""Manage local and global configuration.
Subcommands:
list: List the active configuration (or from the file specified)
edit: Edit the configuration file in an editor
get: Get the value associated with name
set: Set the name=value
unset: Unset the value associated with name
If none of --user, --global and --venv are passed, a virtual
environment configuration file is used if one is active and the file
exists. Otherwise, all modifications happen on the to the user file by
default.
"""
name = 'config'
usage = """
%prog [<file-option>] list
%prog [<file-option>] [--editor <editor-path>] edit
%prog [<file-option>] get name
%prog [<file-option>] set name value
%prog [<file-option>] unset name
"""
summary = "Manage local and global configuration."
def __init__(self, *args, **kwargs):
super(ConfigurationCommand, self).__init__(*args, **kwargs)
self.configuration = None
self.cmd_opts.add_option(
'--editor',
dest='editor',
action='store',
default=None,
help=(
'Editor to use to edit the file. Uses VISUAL or EDITOR '
'environment variables if not provided.'
)
)
self.cmd_opts.add_option(
'--global',
dest='global_file',
action='store_true',
default=False,
help='Use the system-wide configuration file only'
)
self.cmd_opts.add_option(
'--user',
dest='user_file',
action='store_true',
default=False,
help='Use the user configuration file only'
)
self.cmd_opts.add_option(
'--venv',
dest='venv_file',
action='store_true',
default=False,
help='Use the virtualenv configuration file only'
)
self.parser.insert_option_group(0, self.cmd_opts)
def run(self, options, args):
handlers = {
"list": self.list_values,
"edit": self.open_in_editor,
"get": self.get_name,
"set": self.set_name_value,
"unset": self.unset_name
}
# Determine action
if not args or args[0] not in handlers:
logger.error("Need an action ({}) to perform.".format(
", ".join(sorted(handlers)))
)
return ERROR
action = args[0]
# Determine which configuration files are to be loaded
# Depends on whether the command is modifying.
try:
load_only = self._determine_file(
options, need_value=(action in ["get", "set", "unset", "edit"])
)
except PipError as e:
logger.error(e.args[0])
return ERROR
# Load a new configuration
self.configuration = Configuration(
isolated=options.isolated_mode, load_only=load_only
)
self.configuration.load()
# Error handling happens here, not in the action-handlers.
try:
handlers[action](options, args[1:])
except PipError as e:
logger.error(e.args[0])
return ERROR
return SUCCESS
def _determine_file(self, options, need_value):
file_options = {
kinds.USER: options.user_file,
kinds.GLOBAL: options.global_file,
kinds.VENV: options.venv_file
}
if sum(file_options.values()) == 0:
if not need_value:
return None
# Default to user, unless there's a virtualenv file.
elif os.path.exists(venv_config_file):
return kinds.VENV
else:
return kinds.USER
elif sum(file_options.values()) == 1:
# There's probably a better expression for this.
return [key for key in file_options if file_options[key]][0]
raise PipError(
"Need exactly one file to operate upon "
"(--user, --venv, --global) to perform."
)
def list_values(self, options, args):
self._get_n_args(args, "list", n=0)
for key, value in sorted(self.configuration.items()):
logger.info("%s=%r", key, value)
def get_name(self, options, args):
key = self._get_n_args(args, "get [name]", n=1)
value = self.configuration.get_value(key)
logger.info("%s", value)
def set_name_value(self, options, args):
key, value = self._get_n_args(args, "set [name] [value]", n=2)
self.configuration.set_value(key, value)
self._save_configuration()
def unset_name(self, options, args):
key = self._get_n_args(args, "unset [name]", n=1)
self.configuration.unset_value(key)
self._save_configuration()
def open_in_editor(self, options, args):
editor = self._determine_editor(options)
fname = self.configuration.get_file_to_edit()
if fname is None:
raise PipError("Could not determine appropriate file.")
try:
subprocess.check_call([editor, fname])
except subprocess.CalledProcessError as e:
raise PipError(
"Editor Subprocess exited with exit code {}"
.format(e.returncode)
)
def _get_n_args(self, args, example, n):
"""Helper to make sure the command got the right number of arguments
"""
if len(args) != n:
msg = (
'Got unexpected number of arguments, expected {}. '
'(example: "{} config {}")'
).format(n, get_prog(), example)
raise PipError(msg)
if n == 1:
return args[0]
else:
return args
def _save_configuration(self):
# We successfully ran a modifying command. Need to save the
# configuration.
try:
self.configuration.save()
except Exception:
logger.error(
"Unable to save configuration. Please report this as a bug.",
exc_info=1
)
raise PipError("Internal Error.")
def _determine_editor(self, options):
if options.editor is not None:
return options.editor
elif "VISUAL" in os.environ:
return os.environ["VISUAL"]
elif "EDITOR" in os.environ:
return os.environ["EDITOR"]
else:
raise PipError("Could not determine editor to use.")
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