For scalability, use a tree structure to index patterns that are
anchored with a leading slash.
Patterns anchored with leading slash are indexed by leading non-glob
components, making it possible to minimize the number of fnmatch
calls. For example:
/foo*/bar -> {'.': ['/foo*/bar']}
/foo/bar* -> {'foo': {'.': ['/foo/bar*']}}
/foo/bar/ -> {'foo': {'bar': {'.': ['/foo/bar/']}}}
Bug: https://bugs.gentoo.org/675826
Signed-off-by: Zac Medico <zmed...@gentoo.org>
---
lib/portage/util/install_mask.py | 78 +++++++++++++++++++++++++++++---
1 file changed, 72 insertions(+), 6 deletions(-)
diff --git a/lib/portage/util/install_mask.py b/lib/portage/util/install_mask.py
index 32627eb05..84305644c 100644
--- a/lib/portage/util/install_mask.py
+++ b/lib/portage/util/install_mask.py
@@ -3,8 +3,11 @@
__all__ = ['install_mask_dir', 'InstallMask']
+import collections
import errno
import fnmatch
+import functools
+import operator
import sys
from portage import os, _unicode_decode
@@ -18,13 +21,76 @@ else:
_unicode = unicode
+def _defaultdict_tree():
+ return collections.defaultdict(_defaultdict_tree)
+
+
+_pattern = collections.namedtuple('_pattern', ('orig_index', 'is_inclusive',
'pattern'))
+
+
class InstallMask(object):
def __init__(self, install_mask):
"""
@param install_mask: INSTALL_MASK value
@type install_mask: str
"""
- self._install_mask = install_mask.split()
+ # Patterns not anchored with leading slash
+ self._unanchored = []
+
+ # Patterns anchored with leading slash are indexed by leading
+ # non-glob components, making it possible to minimize the
+ # number of fnmatch calls. For example:
+ # /foo*/bar -> {'.': ['/foo*/bar']}
+ # /foo/bar* -> {'foo': {'.': ['/foo/bar*']}}
+ # /foo/bar/ -> {'foo': {'bar': {'.': ['/foo/bar/']}}}
+ self._anchored = _defaultdict_tree()
+ for orig_index, pattern in enumerate(install_mask.split()):
+ # if pattern starts with -, possibly exclude this path
+ is_inclusive = not pattern.startswith('-')
+ if not is_inclusive:
+ pattern = pattern[1:]
+ pattern_obj = _pattern(orig_index, is_inclusive,
pattern)
+ # absolute path pattern
+ if pattern.startswith('/'):
+ current_dir = self._anchored
+ for component in list(filter(None,
pattern.split('/'))):
+ if '*' in component:
+ break
+ else:
+ current_dir =
current_dir[component]
+ current_dir.setdefault('.',
[]).append(pattern_obj)
+
+ # filename
+ else:
+ self._unanchored.append(pattern_obj)
+
+ def _iter_relevant_patterns(self, path):
+ """
+ Iterate over patterns that may be relevant for the given path.
+
+ Patterns anchored with leading / are indexed by leading
+ non-glob components, making it possible to minimize the
+ number of fnmatch calls.
+ """
+ current_dir = self._anchored
+ components = list(filter(None, path.split('/')))
+ patterns = []
+ patterns.extend(current_dir.get('.', []))
+ for component in components:
+ next_dir = current_dir.get(component, None)
+ if next_dir is None:
+ break
+ current_dir = next_dir
+ patterns.extend(current_dir.get('.', []))
+
+ if patterns:
+ # Sort by original pattern index, since order matters
for
+ # non-inclusive patterns.
+ patterns.extend(self._unanchored)
+ patterns.sort(key=operator.attrgetter('orig_index'))
+ return iter(patterns)
+
+ return iter(self._unanchored)
def match(self, path):
"""
@@ -34,11 +100,10 @@ class InstallMask(object):
@return: True if path matches INSTALL_MASK, False otherwise
"""
ret = False
- for pattern in self._install_mask:
- # if pattern starts with -, possibly exclude this path
- is_inclusive = not pattern.startswith('-')
- if not is_inclusive:
- pattern = pattern[1:]
+
+ for pattern_obj in self._iter_relevant_patterns(path):
+ is_inclusive = pattern_obj.is_inclusive
+ pattern = pattern_obj.pattern
# absolute path pattern
if pattern.startswith('/'):
# handle trailing slash for explicit directory
match
@@ -49,6 +114,7 @@ class InstallMask(object):
if (fnmatch.fnmatch(path, pattern[1:])
or fnmatch.fnmatch(path,
pattern[1:].rstrip('/') + '/*')):
ret = is_inclusive
+
# filename
else:
if fnmatch.fnmatch(os.path.basename(path),
pattern):
--
2.18.1
