mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-26 23:00:36 +00:00
208 lines
7.2 KiB
Python
208 lines
7.2 KiB
Python
"""Module with functions which are supposed to be as fast as possible"""
|
|
from stat import S_ISDIR
|
|
from git.compat import (
|
|
byte_ord,
|
|
safe_decode,
|
|
defenc,
|
|
xrange,
|
|
text_type,
|
|
bchr
|
|
)
|
|
|
|
__all__ = ('tree_to_stream', 'tree_entries_from_data', 'traverse_trees_recursive',
|
|
'traverse_tree_recursive')
|
|
|
|
|
|
def tree_to_stream(entries, write):
|
|
"""Write the give list of entries into a stream using its write method
|
|
:param entries: **sorted** list of tuples with (binsha, mode, name)
|
|
:param write: write method which takes a data string"""
|
|
ord_zero = ord('0')
|
|
bit_mask = 7 # 3 bits set
|
|
|
|
for binsha, mode, name in entries:
|
|
mode_str = b''
|
|
for i in xrange(6):
|
|
mode_str = bchr(((mode >> (i * 3)) & bit_mask) + ord_zero) + mode_str
|
|
# END for each 8 octal value
|
|
|
|
# git slices away the first octal if its zero
|
|
if byte_ord(mode_str[0]) == ord_zero:
|
|
mode_str = mode_str[1:]
|
|
# END save a byte
|
|
|
|
# here it comes: if the name is actually unicode, the replacement below
|
|
# will not work as the binsha is not part of the ascii unicode encoding -
|
|
# hence we must convert to an utf8 string for it to work properly.
|
|
# According to my tests, this is exactly what git does, that is it just
|
|
# takes the input literally, which appears to be utf8 on linux.
|
|
if isinstance(name, text_type):
|
|
name = name.encode(defenc)
|
|
write(b''.join((mode_str, b' ', name, b'\0', binsha)))
|
|
# END for each item
|
|
|
|
|
|
def tree_entries_from_data(data):
|
|
"""Reads the binary representation of a tree and returns tuples of Tree items
|
|
:param data: data block with tree data (as bytes)
|
|
:return: list(tuple(binsha, mode, tree_relative_path), ...)"""
|
|
ord_zero = ord('0')
|
|
space_ord = ord(' ')
|
|
len_data = len(data)
|
|
i = 0
|
|
out = []
|
|
while i < len_data:
|
|
mode = 0
|
|
|
|
# read mode
|
|
# Some git versions truncate the leading 0, some don't
|
|
# The type will be extracted from the mode later
|
|
while byte_ord(data[i]) != space_ord:
|
|
# move existing mode integer up one level being 3 bits
|
|
# and add the actual ordinal value of the character
|
|
mode = (mode << 3) + (byte_ord(data[i]) - ord_zero)
|
|
i += 1
|
|
# END while reading mode
|
|
|
|
# byte is space now, skip it
|
|
i += 1
|
|
|
|
# parse name, it is NULL separated
|
|
|
|
ns = i
|
|
while byte_ord(data[i]) != 0:
|
|
i += 1
|
|
# END while not reached NULL
|
|
|
|
# default encoding for strings in git is utf8
|
|
# Only use the respective unicode object if the byte stream was encoded
|
|
name = data[ns:i]
|
|
name = safe_decode(name)
|
|
|
|
# byte is NULL, get next 20
|
|
i += 1
|
|
sha = data[i:i + 20]
|
|
i = i + 20
|
|
out.append((sha, mode, name))
|
|
# END for each byte in data stream
|
|
return out
|
|
|
|
|
|
def _find_by_name(tree_data, name, is_dir, start_at):
|
|
"""return data entry matching the given name and tree mode
|
|
or None.
|
|
Before the item is returned, the respective data item is set
|
|
None in the tree_data list to mark it done"""
|
|
try:
|
|
item = tree_data[start_at]
|
|
if item and item[2] == name and S_ISDIR(item[1]) == is_dir:
|
|
tree_data[start_at] = None
|
|
return item
|
|
except IndexError:
|
|
pass
|
|
# END exception handling
|
|
for index, item in enumerate(tree_data):
|
|
if item and item[2] == name and S_ISDIR(item[1]) == is_dir:
|
|
tree_data[index] = None
|
|
return item
|
|
# END if item matches
|
|
# END for each item
|
|
return None
|
|
|
|
|
|
def _to_full_path(item, path_prefix):
|
|
"""Rebuild entry with given path prefix"""
|
|
if not item:
|
|
return item
|
|
return (item[0], item[1], path_prefix + item[2])
|
|
|
|
|
|
def traverse_trees_recursive(odb, tree_shas, path_prefix):
|
|
"""
|
|
:return: list with entries according to the given binary tree-shas.
|
|
The result is encoded in a list
|
|
of n tuple|None per blob/commit, (n == len(tree_shas)), where
|
|
* [0] == 20 byte sha
|
|
* [1] == mode as int
|
|
* [2] == path relative to working tree root
|
|
The entry tuple is None if the respective blob/commit did not
|
|
exist in the given tree.
|
|
:param tree_shas: iterable of shas pointing to trees. All trees must
|
|
be on the same level. A tree-sha may be None in which case None
|
|
:param path_prefix: a prefix to be added to the returned paths on this level,
|
|
set it '' for the first iteration
|
|
:note: The ordering of the returned items will be partially lost"""
|
|
trees_data = []
|
|
nt = len(tree_shas)
|
|
for tree_sha in tree_shas:
|
|
if tree_sha is None:
|
|
data = []
|
|
else:
|
|
data = tree_entries_from_data(odb.stream(tree_sha).read())
|
|
# END handle muted trees
|
|
trees_data.append(data)
|
|
# END for each sha to get data for
|
|
|
|
out = []
|
|
out_append = out.append
|
|
|
|
# find all matching entries and recursively process them together if the match
|
|
# is a tree. If the match is a non-tree item, put it into the result.
|
|
# Processed items will be set None
|
|
for ti, tree_data in enumerate(trees_data):
|
|
for ii, item in enumerate(tree_data):
|
|
if not item:
|
|
continue
|
|
# END skip already done items
|
|
entries = [None for _ in range(nt)]
|
|
entries[ti] = item
|
|
sha, mode, name = item # its faster to unpack @UnusedVariable
|
|
is_dir = S_ISDIR(mode) # type mode bits
|
|
|
|
# find this item in all other tree data items
|
|
# wrap around, but stop one before our current index, hence
|
|
# ti+nt, not ti+1+nt
|
|
for tio in range(ti + 1, ti + nt):
|
|
tio = tio % nt
|
|
entries[tio] = _find_by_name(trees_data[tio], name, is_dir, ii)
|
|
# END for each other item data
|
|
|
|
# if we are a directory, enter recursion
|
|
if is_dir:
|
|
out.extend(traverse_trees_recursive(
|
|
odb, [((ei and ei[0]) or None) for ei in entries], path_prefix + name + '/'))
|
|
else:
|
|
out_append(tuple(_to_full_path(e, path_prefix) for e in entries))
|
|
# END handle recursion
|
|
|
|
# finally mark it done
|
|
tree_data[ii] = None
|
|
# END for each item
|
|
|
|
# we are done with one tree, set all its data empty
|
|
del(tree_data[:])
|
|
# END for each tree_data chunk
|
|
return out
|
|
|
|
|
|
def traverse_tree_recursive(odb, tree_sha, path_prefix):
|
|
"""
|
|
:return: list of entries of the tree pointed to by the binary tree_sha. An entry
|
|
has the following format:
|
|
* [0] 20 byte sha
|
|
* [1] mode as int
|
|
* [2] path relative to the repository
|
|
:param path_prefix: prefix to prepend to the front of all returned paths"""
|
|
entries = []
|
|
data = tree_entries_from_data(odb.stream(tree_sha).read())
|
|
|
|
# unpacking/packing is faster than accessing individual items
|
|
for sha, mode, name in data:
|
|
if S_ISDIR(mode):
|
|
entries.extend(traverse_tree_recursive(odb, sha, path_prefix + name + '/'))
|
|
else:
|
|
entries.append((sha, mode, path_prefix + name))
|
|
# END for each item
|
|
|
|
return entries
|