cpython/Lib/packaging/manifest.py

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"""Class representing the list of files in a distribution.
The Manifest class can be used to:
- read or write a MANIFEST file
- read a template file and find out the file list
"""
# XXX todo: document + add tests
import re
import os
import fnmatch
from packaging import logger
from packaging.util import write_file, convert_path
from packaging.errors import (PackagingTemplateError,
PackagingInternalError)
__all__ = ['Manifest']
# a \ followed by some spaces + EOL
_COLLAPSE_PATTERN = re.compile('\\\w*\n', re.M)
_COMMENTED_LINE = re.compile('#.*?(?=\n)|\n(?=$)', re.M | re.S)
class Manifest(object):
"""A list of files built by on exploring the filesystem and filtered by
applying various patterns to what we find there.
"""
def __init__(self):
self.allfiles = None
self.files = []
#
# Public API
#
def findall(self, dir=os.curdir):
self.allfiles = _findall(dir)
def append(self, item):
self.files.append(item)
def extend(self, items):
self.files.extend(items)
def sort(self):
# Not a strict lexical sort!
self.files = [os.path.join(*path_tuple) for path_tuple in
sorted(os.path.split(path) for path in self.files)]
def clear(self):
"""Clear all collected files."""
self.files = []
if self.allfiles is not None:
self.allfiles = []
def remove_duplicates(self):
# Assumes list has been sorted!
for i in range(len(self.files) - 1, 0, -1):
if self.files[i] == self.files[i - 1]:
del self.files[i]
def read_template(self, path_or_file):
"""Read and parse a manifest template file.
'path' can be a path or a file-like object.
Updates the list accordingly.
"""
if isinstance(path_or_file, str):
f = open(path_or_file)
else:
f = path_or_file
try:
content = f.read()
# first, let's unwrap collapsed lines
content = _COLLAPSE_PATTERN.sub('', content)
# next, let's remove commented lines and empty lines
content = _COMMENTED_LINE.sub('', content)
# now we have our cleaned up lines
lines = [line.strip() for line in content.split('\n')]
finally:
f.close()
for line in lines:
if line == '':
continue
try:
self._process_template_line(line)
except PackagingTemplateError as msg:
logger.warning("%s, %s", path_or_file, msg)
def write(self, path):
"""Write the file list in 'self.filelist' (presumably as filled in
by 'add_defaults()' and 'read_template()') to the manifest file
named by 'self.manifest'.
"""
if os.path.isfile(path):
with open(path) as fp:
first_line = fp.readline()
if first_line != '# file GENERATED by packaging, do NOT edit\n':
logger.info("not writing to manually maintained "
"manifest file %r", path)
return
self.sort()
self.remove_duplicates()
content = self.files[:]
content.insert(0, '# file GENERATED by packaging, do NOT edit')
logger.info("writing manifest file %r", path)
write_file(path, content)
def read(self, path):
"""Read the manifest file (named by 'self.manifest') and use it to
fill in 'self.filelist', the list of files to include in the source
distribution.
"""
logger.info("reading manifest file %r", path)
with open(path) as manifest:
for line in manifest.readlines():
self.append(line)
def exclude_pattern(self, pattern, anchor=True, prefix=None,
is_regex=False):
"""Remove strings (presumably filenames) from 'files' that match
'pattern'.
Other parameters are the same as for 'include_pattern()', above.
The list 'self.files' is modified in place. Return True if files are
found.
"""
files_found = False
pattern_re = _translate_pattern(pattern, anchor, prefix, is_regex)
for i in range(len(self.files) - 1, -1, -1):
if pattern_re.search(self.files[i]):
del self.files[i]
files_found = True
return files_found
#
# Private API
#
def _parse_template_line(self, line):
words = line.split()
if len(words) == 1 and words[0] not in (
'include', 'exclude', 'global-include', 'global-exclude',
'recursive-include', 'recursive-exclude', 'graft', 'prune'):
# no action given, let's use the default 'include'
words.insert(0, 'include')
action = words[0]
patterns = dir = dir_pattern = None
if action in ('include', 'exclude',
'global-include', 'global-exclude'):
if len(words) < 2:
raise PackagingTemplateError(
"%r expects <pattern1> <pattern2> ..." % action)
patterns = [convert_path(word) for word in words[1:]]
elif action in ('recursive-include', 'recursive-exclude'):
if len(words) < 3:
raise PackagingTemplateError(
"%r expects <dir> <pattern1> <pattern2> ..." % action)
dir = convert_path(words[1])
patterns = [convert_path(word) for word in words[2:]]
elif action in ('graft', 'prune'):
if len(words) != 2:
raise PackagingTemplateError(
"%r expects a single <dir_pattern>" % action)
dir_pattern = convert_path(words[1])
else:
raise PackagingTemplateError("unknown action %r" % action)
return action, patterns, dir, dir_pattern
def _process_template_line(self, line):
# Parse the line: split it up, make sure the right number of words
# is there, and return the relevant words. 'action' is always
# defined: it's the first word of the line. Which of the other
# three are defined depends on the action; it'll be either
# patterns, (dir and patterns), or (dir_pattern).
action, patterns, dir, dir_pattern = self._parse_template_line(line)
# OK, now we know that the action is valid and we have the
# right number of words on the line for that action -- so we
# can proceed with minimal error-checking.
if action == 'include':
for pattern in patterns:
if not self._include_pattern(pattern, anchor=True):
logger.warning("no files found matching %r", pattern)
elif action == 'exclude':
for pattern in patterns:
if not self.exclude_pattern(pattern, anchor=True):
logger.warning("no previously-included files "
"found matching %r", pattern)
elif action == 'global-include':
for pattern in patterns:
if not self._include_pattern(pattern, anchor=False):
logger.warning("no files found matching %r "
"anywhere in distribution", pattern)
elif action == 'global-exclude':
for pattern in patterns:
if not self.exclude_pattern(pattern, anchor=False):
logger.warning("no previously-included files "
"matching %r found anywhere in "
"distribution", pattern)
elif action == 'recursive-include':
for pattern in patterns:
if not self._include_pattern(pattern, prefix=dir):
logger.warning("no files found matching %r "
"under directory %r", pattern, dir)
elif action == 'recursive-exclude':
for pattern in patterns:
if not self.exclude_pattern(pattern, prefix=dir):
logger.warning("no previously-included files "
"matching %r found under directory %r",
pattern, dir)
elif action == 'graft':
if not self._include_pattern(None, prefix=dir_pattern):
logger.warning("no directories found matching %r",
dir_pattern)
elif action == 'prune':
if not self.exclude_pattern(None, prefix=dir_pattern):
logger.warning("no previously-included directories found "
"matching %r", dir_pattern)
else:
raise PackagingInternalError(
"this cannot happen: invalid action %r" % action)
def _include_pattern(self, pattern, anchor=True, prefix=None,
is_regex=False):
"""Select strings (presumably filenames) from 'self.files' that
match 'pattern', a Unix-style wildcard (glob) pattern.
Patterns are not quite the same as implemented by the 'fnmatch'
module: '*' and '?' match non-special characters, where "special"
is platform-dependent: slash on Unix; colon, slash, and backslash on
DOS/Windows; and colon on Mac OS.
If 'anchor' is true (the default), then the pattern match is more
stringent: "*.py" will match "foo.py" but not "foo/bar.py". If
'anchor' is false, both of these will match.
If 'prefix' is supplied, then only filenames starting with 'prefix'
(itself a pattern) and ending with 'pattern', with anything in between
them, will match. 'anchor' is ignored in this case.
If 'is_regex' is true, 'anchor' and 'prefix' are ignored, and
'pattern' is assumed to be either a string containing a regex or a
regex object -- no translation is done, the regex is just compiled
and used as-is.
Selected strings will be added to self.files.
Return True if files are found.
"""
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# XXX docstring lying about what the special chars are?
files_found = False
pattern_re = _translate_pattern(pattern, anchor, prefix, is_regex)
# delayed loading of allfiles list
if self.allfiles is None:
self.findall()
for name in self.allfiles:
if pattern_re.search(name):
self.files.append(name)
files_found = True
return files_found
#
# Utility functions
#
def _findall(dir=os.curdir):
"""Find all files under 'dir' and return the list of full filenames
(relative to 'dir').
"""
from stat import S_ISREG, S_ISDIR, S_ISLNK
list = []
stack = [dir]
pop = stack.pop
push = stack.append
while stack:
dir = pop()
names = os.listdir(dir)
for name in names:
if dir != os.curdir: # avoid the dreaded "./" syndrome
fullname = os.path.join(dir, name)
else:
fullname = name
# Avoid excess stat calls -- just one will do, thank you!
stat = os.stat(fullname)
mode = stat.st_mode
if S_ISREG(mode):
list.append(fullname)
elif S_ISDIR(mode) and not S_ISLNK(mode):
push(fullname)
return list
def _glob_to_re(pattern):
"""Translate a shell-like glob pattern to a regular expression.
Return a string containing the regex. Differs from
'fnmatch.translate()' in that '*' does not match "special characters"
(which are platform-specific).
"""
pattern_re = fnmatch.translate(pattern)
# '?' and '*' in the glob pattern become '.' and '.*' in the RE, which
# IMHO is wrong -- '?' and '*' aren't supposed to match slash in Unix,
# and by extension they shouldn't match such "special characters" under
# any OS. So change all non-escaped dots in the RE to match any
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# character except the special characters (currently: just os.sep).
sep = os.sep
if os.sep == '\\':
# we're using a regex to manipulate a regex, so we need
# to escape the backslash twice
sep = r'\\\\'
escaped = r'\1[^%s]' % sep
pattern_re = re.sub(r'((?<!\\)(\\\\)*)\.', escaped, pattern_re)
return pattern_re
def _translate_pattern(pattern, anchor=True, prefix=None, is_regex=False):
"""Translate a shell-like wildcard pattern to a compiled regular
expression.
Return the compiled regex. If 'is_regex' true,
then 'pattern' is directly compiled to a regex (if it's a string)
or just returned as-is (assumes it's a regex object).
"""
if is_regex:
if isinstance(pattern, str):
return re.compile(pattern)
else:
return pattern
if pattern:
pattern_re = _glob_to_re(pattern)
else:
pattern_re = ''
if prefix is not None:
# ditch end of pattern character
empty_pattern = _glob_to_re('')
prefix_re = _glob_to_re(prefix)[:-len(empty_pattern)]
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sep = os.sep
if os.sep == '\\':
sep = r'\\'
pattern_re = "^" + sep.join((prefix_re, ".*" + pattern_re))
else: # no prefix -- respect anchor flag
if anchor:
pattern_re = "^" + pattern_re
return re.compile(pattern_re)