This file is indexed.

/usr/share/pyshared/git/index/fun.py is in python-git 0.3.2~RC1-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
# Contains standalone functions to accompany the index implementation and make it
# more versatile
# NOTE: Autodoc hates it if this is a docstring
from stat import (
					S_IFDIR,
					S_IFLNK,
					S_ISLNK,
					S_IFDIR,
					S_ISDIR,
					S_IFMT,
					S_IFREG,
				)

S_IFGITLINK = S_IFLNK | S_IFDIR		# a submodule

from cStringIO import StringIO

from git.util import IndexFileSHA1Writer
from git.exc import UnmergedEntriesError
from git.objects.fun import (
								tree_to_stream,
								traverse_tree_recursive,
								traverse_trees_recursive
							)

from typ import (
					BaseIndexEntry,
					IndexEntry,
					CE_NAMEMASK, 
					CE_STAGESHIFT
				)
CE_NAMEMASK_INV = ~CE_NAMEMASK

from util import 	(
					pack, 
					unpack
					)

from gitdb.base import IStream
from gitdb.typ import str_tree_type

__all__ = ('write_cache', 'read_cache', 'write_tree_from_cache', 'entry_key', 
			'stat_mode_to_index_mode', 'S_IFGITLINK')


def stat_mode_to_index_mode(mode):
	"""Convert the given mode from a stat call to the corresponding index mode
	and return it"""
	if S_ISLNK(mode):	# symlinks
		return S_IFLNK
	if S_ISDIR(mode) or S_IFMT(mode) == S_IFGITLINK:	# submodules
		return S_IFGITLINK
	return S_IFREG | 0644 | (mode & 0100) 		# blobs with or without executable bit


def write_cache(entries, stream, extension_data=None, ShaStreamCls=IndexFileSHA1Writer):
	"""Write the cache represented by entries to a stream
	
	:param entries: **sorted** list of entries
	:param stream: stream to wrap into the AdapterStreamCls - it is used for
		final output.
		
	:param ShaStreamCls: Type to use when writing to the stream. It produces a sha
		while writing to it, before the data is passed on to the wrapped stream
		
	:param extension_data: any kind of data to write as a trailer, it must begin
		a 4 byte identifier, followed by its size ( 4 bytes )"""
	# wrap the stream into a compatible writer
	stream = ShaStreamCls(stream)
	
	tell = stream.tell
	write = stream.write

	# header
	version = 2
	write("DIRC")
	write(pack(">LL", version, len(entries)))

	# body
	for entry in entries:
		beginoffset = tell()
		write(entry[4])			# ctime
		write(entry[5])			# mtime
		path = entry[3]
		plen = len(path) & CE_NAMEMASK		# path length
		assert plen == len(path), "Path %s too long to fit into index" % entry[3]
		flags = plen | (entry[2] & CE_NAMEMASK_INV)		# clear possible previous values
		write(pack(">LLLLLL20sH", entry[6], entry[7], entry[0],
									entry[8], entry[9], entry[10], entry[1], flags))
		write(path)
		real_size = ((tell() - beginoffset + 8) & ~7)
		write("\0" * ((beginoffset + real_size) - tell()))
	# END for each entry

	# write previously cached extensions data
	if extension_data is not None:
		stream.write(extension_data)

	# write the sha over the content
	stream.write_sha()
	
def read_header(stream):
		"""Return tuple(version_long, num_entries) from the given stream"""
		type_id = stream.read(4)
		if type_id != "DIRC":
			raise AssertionError("Invalid index file header: %r" % type_id)
		version, num_entries = unpack(">LL", stream.read(4 * 2))
		
		# TODO: handle version 3: extended data, see read-cache.c
		assert version in (1, 2)
		return version, num_entries

def entry_key(*entry):
	""":return: Key suitable to be used for the index.entries dictionary
	:param entry: One instance of type BaseIndexEntry or the path and the stage"""
	if len(entry) == 1:
		return (entry[0].path, entry[0].stage)
	else:
		return tuple(entry)
	# END handle entry

def read_cache(stream):
	"""Read a cache file from the given stream
	:return: tuple(version, entries_dict, extension_data, content_sha)
		* version is the integer version number
		* entries dict is a dictionary which maps IndexEntry instances to a path
			at a stage
		* extension_data is '' or 4 bytes of type + 4 bytes of size + size bytes
		* content_sha is a 20 byte sha on all cache file contents"""
	version, num_entries = read_header(stream)
	count = 0
	entries = dict()
	
	read = stream.read
	tell = stream.tell
	while count < num_entries:
		beginoffset = tell()
		ctime = unpack(">8s", read(8))[0]
		mtime = unpack(">8s", read(8))[0]
		(dev, ino, mode, uid, gid, size, sha, flags) = \
			unpack(">LLLLLL20sH", read(20 + 4 * 6 + 2))
		path_size = flags & CE_NAMEMASK
		path = read(path_size)
	
		real_size = ((tell() - beginoffset + 8) & ~7)
		data = read((beginoffset + real_size) - tell())
		entry = IndexEntry((mode, sha, flags, path, ctime, mtime, dev, ino, uid, gid, size))
		# entry_key would be the method to use, but we safe the effort
		entries[(path, entry.stage)] = entry
		count += 1
	# END for each entry

	# the footer contains extension data and a sha on the content so far
	# Keep the extension footer,and verify we have a sha in the end
	# Extension data format is:
	# 4 bytes ID
	# 4 bytes length of chunk
	# repeated 0 - N times
	extension_data = stream.read(~0)
	assert len(extension_data) > 19, "Index Footer was not at least a sha on content as it was only %i bytes in size" % len(extension_data)

	content_sha = extension_data[-20:]

	# truncate the sha in the end as we will dynamically create it anyway
	extension_data = extension_data[:-20]
	
	return (version, entries, extension_data, content_sha)
	
def write_tree_from_cache(entries, odb, sl, si=0):
	"""Create a tree from the given sorted list of entries and put the respective
	trees into the given object database
	
	:param entries: **sorted** list of IndexEntries
	:param odb: object database to store the trees in
	:param si: start index at which we should start creating subtrees
	:param sl: slice indicating the range we should process on the entries list
	:return: tuple(binsha, list(tree_entry, ...)) a tuple of a sha and a list of 
		tree entries being a tuple of hexsha, mode, name"""
	tree_items = list()
	tree_items_append = tree_items.append
	ci = sl.start
	end = sl.stop
	while ci < end:
		entry = entries[ci]
		if entry.stage != 0:
			raise UnmergedEntriesError(entry)
		# END abort on unmerged
		ci += 1
		rbound = entry.path.find('/', si)
		if rbound == -1:
			# its not a tree
			tree_items_append((entry.binsha, entry.mode, entry.path[si:]))
		else:
			# find common base range
			base = entry.path[si:rbound]
			xi = ci
			while xi < end:
				oentry = entries[xi]
				orbound = oentry.path.find('/', si)
				if orbound == -1 or oentry.path[si:orbound] != base:
					break
				# END abort on base mismatch
				xi += 1
			# END find common base
			
			# enter recursion
			# ci - 1 as we want to count our current item as well
			sha, tree_entry_list = write_tree_from_cache(entries, odb, slice(ci-1, xi), rbound+1)
			tree_items_append((sha, S_IFDIR, base))
			
			# skip ahead
			ci = xi
		# END handle bounds 
	# END for each entry
	
	# finally create the tree
	sio = StringIO()
	tree_to_stream(tree_items, sio.write)
	sio.seek(0)
	
	istream = odb.store(IStream(str_tree_type, len(sio.getvalue()), sio))
	return (istream.binsha, tree_items)
	
def _tree_entry_to_baseindexentry(tree_entry, stage):
	return BaseIndexEntry((tree_entry[1], tree_entry[0], stage <<CE_STAGESHIFT, tree_entry[2]))
	
def aggressive_tree_merge(odb, tree_shas):
	"""
	:return: list of BaseIndexEntries representing the aggressive merge of the given
		trees. All valid entries are on stage 0, whereas the conflicting ones are left 
		on stage 1, 2 or 3, whereas stage 1 corresponds to the common ancestor tree, 
		2 to our tree and 3 to 'their' tree.
	:param tree_shas: 1, 2 or 3 trees as identified by their binary 20 byte shas
		If 1 or two, the entries will effectively correspond to the last given tree
		If 3 are given, a 3 way merge is performed"""
	out = list()
	out_append = out.append
	
	# one and two way is the same for us, as we don't have to handle an existing
	# index, instrea
	if len(tree_shas) in (1,2):
		for entry in traverse_tree_recursive(odb, tree_shas[-1], ''):
			out_append(_tree_entry_to_baseindexentry(entry, 0))
		# END for each entry
		return out
	# END handle single tree 
	
	if len(tree_shas) > 3:
		raise ValueError("Cannot handle %i trees at once" % len(tree_shas))

	# three trees
	for base, ours, theirs in traverse_trees_recursive(odb, tree_shas, ''):
		if base is not None:
			# base version exists
			if ours is not None:
				# ours exists
				if theirs is not None:
					# it exists in all branches, if it was changed in both
					# its a conflict, otherwise we take the changed version
					# This should be the most common branch, so it comes first
					if( base[0] != ours[0] and base[0] != theirs[0] and ours[0] != theirs[0] ) or \
						( base[1] != ours[1] and base[1] != theirs[1] and ours[1] != theirs[1] ):
						# changed by both
						out_append(_tree_entry_to_baseindexentry(base, 1))
						out_append(_tree_entry_to_baseindexentry(ours, 2))
						out_append(_tree_entry_to_baseindexentry(theirs, 3))
					elif base[0] != ours[0] or base[1] != ours[1]:
						# only we changed it
						out_append(_tree_entry_to_baseindexentry(ours, 0))
					else:
						# either nobody changed it, or they did. In either
						# case, use theirs
						out_append(_tree_entry_to_baseindexentry(theirs, 0))
					# END handle modification 
				else:
					
					if ours[0] != base[0] or ours[1] != base[1]:
						# they deleted it, we changed it, conflict 
						out_append(_tree_entry_to_baseindexentry(base, 1))
						out_append(_tree_entry_to_baseindexentry(ours, 2))
					# else:
					#	we didn't change it, ignore
					#	pass
					# END handle our change
				# END handle theirs
			else:
				if theirs is None:
					# deleted in both, its fine - its out
					pass
				else:
					if theirs[0] != base[0] or theirs[1] != base[1]:
						# deleted in ours, changed theirs, conflict
						out_append(_tree_entry_to_baseindexentry(base, 1))
						out_append(_tree_entry_to_baseindexentry(theirs, 3))
					# END theirs changed
					#else:
					# 	theirs didnt change
					#	pass
				# END handle theirs
			# END handle ours
		else:
			# all three can't be None
			if ours is None:
				# added in their branch
				out_append(_tree_entry_to_baseindexentry(theirs, 0))
			elif theirs is None:
				# added in our branch
				out_append(_tree_entry_to_baseindexentry(ours, 0))
			else:
				# both have it, except for the base, see whether it changed
				if ours[0] != theirs[0] or ours[1] != theirs[1]:
					out_append(_tree_entry_to_baseindexentry(ours, 2))
					out_append(_tree_entry_to_baseindexentry(theirs, 3))
				else:
					# it was added the same in both
					out_append(_tree_entry_to_baseindexentry(ours, 0))
				# END handle two items
			# END handle heads
		# END handle base exists
	# END for each entries tuple

	return out