mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-14 17:20:39 +00:00
385 lines
14 KiB
Python
385 lines
14 KiB
Python
# Contains standalone functions to accompany the index implementation and make it
|
|
# more versatile
|
|
# NOTE: Autodoc hates it if this is a docstring
|
|
from io import BytesIO
|
|
import os
|
|
from stat import (
|
|
S_IFDIR,
|
|
S_IFLNK,
|
|
S_ISLNK,
|
|
S_ISDIR,
|
|
S_IFMT,
|
|
S_IFREG,
|
|
)
|
|
import subprocess
|
|
|
|
from git.cmd import PROC_CREATIONFLAGS, handle_process_output
|
|
from git.compat import (
|
|
PY3,
|
|
defenc,
|
|
force_text,
|
|
force_bytes,
|
|
is_posix,
|
|
safe_encode,
|
|
safe_decode,
|
|
)
|
|
from git.exc import (
|
|
UnmergedEntriesError,
|
|
HookExecutionError
|
|
)
|
|
from git.objects.fun import (
|
|
tree_to_stream,
|
|
traverse_tree_recursive,
|
|
traverse_trees_recursive
|
|
)
|
|
from git.util import IndexFileSHA1Writer, finalize_process
|
|
from gitdb.base import IStream
|
|
from gitdb.typ import str_tree_type
|
|
|
|
import os.path as osp
|
|
|
|
from .typ import (
|
|
BaseIndexEntry,
|
|
IndexEntry,
|
|
CE_NAMEMASK,
|
|
CE_STAGESHIFT
|
|
)
|
|
from .util import (
|
|
pack,
|
|
unpack
|
|
)
|
|
|
|
|
|
S_IFGITLINK = S_IFLNK | S_IFDIR # a submodule
|
|
CE_NAMEMASK_INV = ~CE_NAMEMASK
|
|
|
|
__all__ = ('write_cache', 'read_cache', 'write_tree_from_cache', 'entry_key',
|
|
'stat_mode_to_index_mode', 'S_IFGITLINK', 'run_commit_hook', 'hook_path')
|
|
|
|
|
|
def hook_path(name, git_dir):
|
|
""":return: path to the given named hook in the given git repository directory"""
|
|
return osp.join(git_dir, 'hooks', name)
|
|
|
|
|
|
def run_commit_hook(name, index, *args):
|
|
"""Run the commit hook of the given name. Silently ignores hooks that do not exist.
|
|
:param name: name of hook, like 'pre-commit'
|
|
:param index: IndexFile instance
|
|
:param args: arguments passed to hook file
|
|
:raises HookExecutionError: """
|
|
hp = hook_path(name, index.repo.git_dir)
|
|
if not os.access(hp, os.X_OK):
|
|
return
|
|
|
|
env = os.environ.copy()
|
|
env['GIT_INDEX_FILE'] = safe_decode(index.path) if PY3 else safe_encode(index.path)
|
|
env['GIT_EDITOR'] = ':'
|
|
try:
|
|
cmd = subprocess.Popen([hp] + list(args),
|
|
env=env,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE,
|
|
cwd=index.repo.working_dir,
|
|
close_fds=is_posix,
|
|
creationflags=PROC_CREATIONFLAGS,)
|
|
except Exception as ex:
|
|
raise HookExecutionError(hp, ex)
|
|
else:
|
|
stdout = []
|
|
stderr = []
|
|
handle_process_output(cmd, stdout.append, stderr.append, finalize_process)
|
|
stdout = ''.join(stdout)
|
|
stderr = ''.join(stderr)
|
|
if cmd.returncode != 0:
|
|
stdout = force_text(stdout, defenc)
|
|
stderr = force_text(stderr, defenc)
|
|
raise HookExecutionError(hp, cmd.returncode, stderr, stdout)
|
|
# end handle return code
|
|
|
|
|
|
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 | 0o644 | (mode & 0o111) # 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(b"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]
|
|
path = force_bytes(path, encoding=defenc)
|
|
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(b"\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 != b"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 = {}
|
|
|
|
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).decode(defenc)
|
|
|
|
real_size = ((tell() - beginoffset + 8) & ~7)
|
|
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 = []
|
|
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) # @UnusedVariable
|
|
tree_items_append((sha, S_IFDIR, base))
|
|
|
|
# skip ahead
|
|
ci = xi
|
|
# END handle bounds
|
|
# END for each entry
|
|
|
|
# finally create the tree
|
|
sio = BytesIO()
|
|
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 = []
|
|
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 didn't 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
|