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# This module is part of GitPython and is released under the
# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/
"""Standalone functions to accompany the index implementation and make it more
versatile."""
__all__= [
"write_cache",
"read_cache",
"write_tree_from_cache",
"entry_key",
"stat_mode_to_index_mode",
"S_IFGITLINK",
"run_commit_hook",
"hook_path",
]
fromioimportBytesIO
importos
importos.pathasosp
frompathlibimportPath
fromstatimportS_IFDIR,S_IFLNK,S_IFMT,S_IFREG,S_ISDIR,S_ISLNK,S_IXUSR
importsubprocess
importsys
fromgitdb.baseimportIStream
fromgitdb.typimportstr_tree_type
fromgit.cmdimporthandle_process_output,safer_popen
fromgit.compatimportdefenc,force_bytes,force_text,safe_decode
fromgit.excimportHookExecutionError,UnmergedEntriesError
fromgit.objects.funimport (
traverse_tree_recursive,
traverse_trees_recursive,
tree_to_stream,
)
fromgit.utilimportIndexFileSHA1Writer,finalize_process
from .typimportCE_EXTENDED,BaseIndexEntry,IndexEntry,CE_NAMEMASK,CE_STAGESHIFT
from .utilimportpack,unpack
# typing -----------------------------------------------------------------------------
fromtypingimportDict,IO,List,Sequence,TYPE_CHECKING,Tuple,Type,Union,cast
fromgit.typesimportPathLike
ifTYPE_CHECKING:
fromgit.dbimportGitCmdObjectDB
fromgit.objects.treeimportTreeCacheTup
from .baseimportIndexFile
# ------------------------------------------------------------------------------------
S_IFGITLINK=S_IFLNK|S_IFDIR
"""Flags for a submodule."""
CE_NAMEMASK_INV=~CE_NAMEMASK
defhook_path(name:str,git_dir:PathLike)->str:
""":return: path to the given named hook in the given git repository directory"""
returnosp.join(git_dir,"hooks",name)
def_has_file_extension(path:str)->str:
returnosp.splitext(path)[1]
defrun_commit_hook(name:str,index:"IndexFile",*args:str)->None:
"""Run the commit hook of the given name. Silently ignore hooks that do not exist.
:param name:
Name of hook, like ``pre-commit``.
:param index:
:class:`~git.index.base.IndexFile` instance.
:param args:
Arguments passed to hook file.
:raise git.exc.HookExecutionError:
"""
hp=hook_path(name,index.repo.git_dir)
ifnotos.access(hp,os.X_OK):
return
env=os.environ.copy()
env["GIT_INDEX_FILE"]=safe_decode(os.fspath(index.path))
env["GIT_EDITOR"]=":"
cmd= [hp]
try:
ifsys.platform=="win32"andnot_has_file_extension(hp):
# Windows only uses extensions to determine how to open files
# (doesn't understand shebangs). Try using bash to run the hook.
relative_hp=Path(hp).relative_to(index.repo.working_dir).as_posix()
cmd= ["bash.exe",relative_hp]
process=safer_popen(
cmd+list(args),
env=env,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
cwd=index.repo.working_dir,
)
exceptExceptionasex:
raiseHookExecutionError(hp,ex)fromex
else:
stdout_list:List[str]= []
stderr_list:List[str]= []
handle_process_output(process,stdout_list.append,stderr_list.append,finalize_process)
stdout="".join(stdout_list)
stderr="".join(stderr_list)
ifprocess.returncode!=0:
stdout=force_text(stdout,defenc)
stderr=force_text(stderr,defenc)
raiseHookExecutionError(hp,process.returncode,stderr,stdout)
# END handle return code
defstat_mode_to_index_mode(mode:int)->int:
"""Convert the given mode from a stat call to the corresponding index mode and
return it."""
ifS_ISLNK(mode):# symlinks
returnS_IFLNK
ifS_ISDIR(mode)orS_IFMT(mode)==S_IFGITLINK:# submodules
returnS_IFGITLINK
returnS_IFREG| (mode&S_IXUSRand0o755or0o644)# blobs with or without executable bit
defwrite_cache(
entries:Sequence[Union[BaseIndexEntry,"IndexEntry"]],
stream:IO[bytes],
extension_data:Union[None,bytes]=None,
ShaStreamCls:Type[IndexFileSHA1Writer]=IndexFileSHA1Writer,
)->None:
"""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_sha=ShaStreamCls(stream)
tell=stream_sha.tell
write=stream_sha.write
# Header
version=3ifany(entry.extended_flagsforentryinentries)else2
write(b"DIRC")
write(pack(">LL",version,len(entries)))
# Body
forentryinentries:
beginoffset=tell()
write(entry.ctime_bytes)# ctime
write(entry.mtime_bytes)# mtime
path_str=str(entry.path)
path:bytes=force_bytes(path_str,encoding=defenc)
plen=len(path)&CE_NAMEMASK# Path length
assertplen==len(path),"Path %s too long to fit into index"%entry.path
flags=plen| (entry.flags&CE_NAMEMASK_INV)# Clear possible previous values.
ifentry.extended_flags:
flags|=CE_EXTENDED
write(
pack(
">LLLLLL20sH",
entry.dev,
entry.inode,
entry.mode,
entry.uid,
entry.gid,
entry.size,
entry.binsha,
flags,
)
)
ifentry.extended_flags:
write(pack(">H",entry.extended_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.
ifextension_dataisnotNone:
stream_sha.write(extension_data)
# Write the sha over the content.
stream_sha.write_sha()
defread_header(stream:IO[bytes])->Tuple[int,int]:
"""Return tuple(version_long, num_entries) from the given stream."""
type_id=stream.read(4)
iftype_id!=b"DIRC":
raiseAssertionError("Invalid index file header: %r"%type_id)
unpacked=cast(Tuple[int,int],unpack(">LL",stream.read(4*2)))
version,num_entries=unpacked
assertversionin (1,2,3),"Unsupported git index version %i, only 1, 2, and 3 are supported"%version
returnversion,num_entries
defentry_key(*entry:Union[BaseIndexEntry,PathLike,int])->Tuple[PathLike,int]:
"""
:return:
Key suitable to be used for the
:attr:`index.entries <git.index.base.IndexFile.entries>` dictionary.
:param entry:
One instance of type BaseIndexEntry or the path and the stage.
"""
# def is_entry_key_tup(entry_key: Tuple) -> TypeGuard[Tuple[PathLike, int]]:
# return isinstance(entry_key, tuple) and len(entry_key) == 2
iflen(entry)==1:
entry_first=entry[0]
assertisinstance(entry_first,BaseIndexEntry)
return (entry_first.path,entry_first.stage)
else:
# assert is_entry_key_tup(entry)
entry=cast(Tuple[PathLike,int],entry)
returnentry
# END handle entry
defread_cache(
stream:IO[bytes],
)->Tuple[int,Dict[Tuple[PathLike,int],"IndexEntry"],bytes,bytes]:
"""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[Tuple[PathLike,int],"IndexEntry"]= {}
read=stream.read
tell=stream.tell
whilecount<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))
extended_flags=0
ifflags&CE_EXTENDED:
extended_flags=unpack(">H",read(2))[0]
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,extended_flags))
# entry_key would be the method to use, but we save 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)
assertlen(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)
defwrite_tree_from_cache(
entries:List[IndexEntry],odb:"GitCmdObjectDB",sl:slice,si:int=0
)->Tuple[bytes,List["TreeCacheTup"]]:
R"""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 :class:`~git.index.typ.IndexEntry`\s.
: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["TreeCacheTup"]= []
ci=sl.start
end=sl.stop
whileci<end:
entry=entries[ci]
ifentry.stage!=0:
raiseUnmergedEntriesError(entry)
# END abort on unmerged
ci+=1
rbound=entry.path.find("/",si)
ifrbound==-1:
# It's 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
whilexi<end:
oentry=entries[xi]
orbound=oentry.path.find("/",si)
iforbound==-1oroentry.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=BytesIO()
tree_to_stream(tree_items,sio.write)# Writes to stream as bytes, but doesn't change tree_items.
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:"TreeCacheTup",stage:int)->BaseIndexEntry:
returnBaseIndexEntry((tree_entry[1],tree_entry[0],stage<<CE_STAGESHIFT,tree_entry[2]))
defaggressive_tree_merge(odb:"GitCmdObjectDB",tree_shas:Sequence[bytes])->List[BaseIndexEntry]:
R"""
:return:
List of :class:`~git.index.typ.BaseIndexEntry`\s 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[BaseIndexEntry]= []
# One and two way is the same for us, as we don't have to handle an existing
# index, instrea
iflen(tree_shas)in (1,2):
forentryintraverse_tree_recursive(odb,tree_shas[-1],""):
out.append(_tree_entry_to_baseindexentry(entry,0))
# END for each entry
returnout
# END handle single tree
iflen(tree_shas)>3:
raiseValueError("Cannot handle %i trees at once"%len(tree_shas))
# Three trees.
forbase,ours,theirsintraverse_trees_recursive(odb,tree_shas,""):
ifbaseisnotNone:
# Base version exists.
ifoursisnotNone:
# Ours exists.
iftheirsisnotNone:
# It exists in all branches. Ff 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]andbase[0]!=theirs[0]andours[0]!=theirs[0])or (
base[1]!=ours[1]andbase[1]!=theirs[1]andours[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))
elifbase[0]!=ours[0]orbase[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:
ifours[0]!=base[0]orours[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:
iftheirsisNone:
# Deleted in both, its fine - it's out.
pass
else:
iftheirs[0]!=base[0]ortheirs[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.
ifoursisNone:
# Added in their branch.
asserttheirsisnotNone
out.append(_tree_entry_to_baseindexentry(theirs,0))
eliftheirsisNone:
# Added in our branch.
out.append(_tree_entry_to_baseindexentry(ours,0))
else:
# Both have it, except for the base, see whether it changed.
ifours[0]!=theirs[0]orours[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
returnout