Make a copy to modify via item.meta.copy() if needed, or call
copy_item().
-
The want_meta argument is advisory for calls that accept it, and it
may not be honored. Callers must be able to handle an item.meta value
that is either an instance of Metadata or an integer mode, perhaps
### vfs cache
### A general purpose shared cache with (currently) cheap random
-### eviction. There is currently no weighting so a single commit item
-### is just as likely to be evicted as an entire "rev-list". See
+### eviction. At the moment there is no weighting so a single commit
+### item is just as likely to be evicted as an entire "rev-list". See
### is_valid_cache_key for a description of the expected content.
_cache = {}
def is_valid_cache_key(x):
"""Return logically true if x looks like it could be a valid cache key
(with respect to structure). Current valid cache entries:
+ (path, parent, want_meta, dref) -> resolution
commit_oid -> commit
commit_oid + ':r' -> rev-list
i.e. rev-list -> {'.', commit, '2012...', next_commit, ...}
"""
# Suspect we may eventually add "(container_oid, name) -> ...", and others.
x_t = type(x)
+ if x_t is tuple:
+ return len(x) == 4
if x_t is bytes:
if len(x) == 20:
return True
_cache_keys[victim_i] = key
_cache[key] = value
-
def cache_get_commit_item(oid, need_meta=True):
"""Return the requested tree item if it can be found in the cache.
When need_meta is true don't return a cached item that only has a
if commit:
return RevList(oid=oid, meta=commit.meta)
-
def copy_item(item):
"""Return a completely independent copy of item, such that
modifications will not affect the original.
yield x
def _resolve_path(repo, path, parent=None, want_meta=True, deref=False):
+ cache_key = (tuple(path), parent, not not want_meta, not not deref)
+ resolution = cache_get(cache_key)
+ if resolution:
+ return resolution
+
+ def notice_resolution(r):
+ cache_notice(cache_key, r)
+ return r
+
def raise_dir_required_but_not_dir(path, parent, past):
raise IOError(ENOTDIR,
"path %r%s resolves to non-directory %r"
deref = True
if not future: # path was effectively '.' or '/'
if is_absolute:
- return (('', _root),)
+ return notice_resolution((('', _root),))
if parent:
- return tuple(parent)
- return [('', _root)]
+ return notice_resolution(tuple(parent))
+ return notice_resolution((('', _root),))
if is_absolute:
past = [('', _root)]
else:
if not future:
if must_be_dir and not S_ISDIR(item_mode(past[-1][1])):
raise_dir_required_but_not_dir(path, parent, past)
- return tuple(past)
+ return notice_resolution(tuple(past))
segment = future.pop()
if segment == '..':
assert len(past) > 0
past[-1] = parent_name, parent_item
if not item:
past.append((segment, None),)
- return tuple(past)
+ return notice_resolution(tuple(past))
mode = item_mode(item)
if not S_ISLNK(mode):
if not S_ISDIR(mode):
terminus=past)
if must_be_dir:
raise_dir_required_but_not_dir(path, parent, past)
- return tuple(past)
+ return notice_resolution(tuple(past))
# It's treeish
if want_meta and type(item) in real_tree_types:
dir_meta = _find_treeish_oid_metadata(repo, item.oid)
is_absolute, _, target_future = _decompose_path(target)
if is_absolute:
if not target_future: # path was effectively '/'
- return (('', _root),)
+ return notice_resolution((('', _root),))
past = [('', _root)]
future = target_future
else:
projects / bup.git / commitdiff