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import os
from subprocess import PIPE, Popen
from django.apps import apps as installed_apps
from django.utils.crypto import get_random_string
from django.utils.encoding import DEFAULT_LOCALE_ENCODING
from .base import CommandError
def popen_wrapper(args, stdout_encoding='utf-8'):
"""
Friendly wrapper around Popen.
Return stdout output, stderr output, and OS status code.
"""
try:
p = Popen(args, shell=False, stdout=PIPE, stderr=PIPE, close_fds=os.name != 'nt')
except OSError as err:
raise CommandError('Error executing %s' % args[0]) from err
output, errors = p.communicate()
return (
output.decode(stdout_encoding),
errors.decode(DEFAULT_LOCALE_ENCODING, errors='replace'),
p.returncode
)
def handle_extensions(extensions):
"""
Organize multiple extensions that are separated with commas or passed by
using --extension/-e multiple times.
For example: running 'django-admin makemessages -e js,txt -e xhtml -a'
would result in an extension list: ['.js', '.txt', '.xhtml']
>>> handle_extensions(['.html', 'html,js,py,py,py,.py', 'py,.py'])
{'.html', '.js', '.py'}
>>> handle_extensions(['.html, txt,.tpl'])
{'.html', '.tpl', '.txt'}
"""
ext_list = []
for ext in extensions:
ext_list.extend(ext.replace(' ', '').split(','))
for i, ext in enumerate(ext_list):
if not ext.startswith('.'):
ext_list[i] = '.%s' % ext_list[i]
return set(ext_list)
def find_command(cmd, path=None, pathext=None):
if path is None:
path = os.environ.get('PATH', '').split(os.pathsep)
if isinstance(path, str):
path = [path]
# check if there are funny path extensions for executables, e.g. Windows
if pathext is None:
pathext = os.environ.get('PATHEXT', '.COM;.EXE;.BAT;.CMD').split(os.pathsep)
# don't use extensions if the command ends with one of them
for ext in pathext:
if cmd.endswith(ext):
pathext = ['']
break
# check if we find the command on PATH
for p in path:
f = os.path.join(p, cmd)
if os.path.isfile(f):
return f
for ext in pathext:
fext = f + ext
if os.path.isfile(fext):
return fext
return None
def get_random_secret_key():
"""
Return a 50 character random string usable as a SECRET_KEY setting value.
"""
chars = 'abcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*(-_=+)'
return get_random_string(50, chars)
def parse_apps_and_model_labels(labels):
"""
Parse a list of "app_label.ModelName" or "app_label" strings into actual
objects and return a two-element tuple:
(set of model classes, set of app_configs).
Raise a CommandError if some specified models or apps don't exist.
"""
apps = set()
models = set()
for label in labels:
if '.' in label:
try:
model = installed_apps.get_model(label)
except LookupError:
raise CommandError('Unknown model: %s' % label)
models.add(model)
else:
try:
app_config = installed_apps.get_app_config(label)
except LookupError as e:
raise CommandError(str(e))
apps.add(app_config)
return models, apps
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