mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-07-01 14:41:01 +02:00
385 lines
14 KiB
Python
385 lines
14 KiB
Python
# Contains standalone functions to accompany the index implementation and make it
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# more versatile
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# NOTE: Autodoc hates it if this is a docstring
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from io import BytesIO
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import os
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from stat import (
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S_IFDIR,
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S_IFLNK,
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S_ISLNK,
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S_ISDIR,
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S_IFMT,
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S_IFREG,
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)
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import subprocess
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from git.cmd import PROC_CREATIONFLAGS, handle_process_output
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from git.compat import (
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PY3,
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defenc,
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force_text,
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force_bytes,
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is_posix,
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safe_encode,
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safe_decode,
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)
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from git.exc import (
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UnmergedEntriesError,
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HookExecutionError
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)
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from git.objects.fun import (
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tree_to_stream,
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traverse_tree_recursive,
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traverse_trees_recursive
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)
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from git.util import IndexFileSHA1Writer, finalize_process
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from gitdb.base import IStream
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from gitdb.typ import str_tree_type
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import os.path as osp
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from .typ import (
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BaseIndexEntry,
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IndexEntry,
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CE_NAMEMASK,
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CE_STAGESHIFT
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)
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from .util import (
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pack,
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unpack
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)
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S_IFGITLINK = S_IFLNK | S_IFDIR # a submodule
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CE_NAMEMASK_INV = ~CE_NAMEMASK
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__all__ = ('write_cache', 'read_cache', 'write_tree_from_cache', 'entry_key',
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'stat_mode_to_index_mode', 'S_IFGITLINK', 'run_commit_hook', 'hook_path')
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def hook_path(name, git_dir):
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""":return: path to the given named hook in the given git repository directory"""
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return osp.join(git_dir, 'hooks', name)
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def run_commit_hook(name, index, *args):
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"""Run the commit hook of the given name. Silently ignores hooks that do not exist.
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:param name: name of hook, like 'pre-commit'
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:param index: IndexFile instance
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:param args: arguments passed to hook file
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:raises HookExecutionError: """
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hp = hook_path(name, index.repo.git_dir)
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if not os.access(hp, os.X_OK):
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return
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env = os.environ.copy()
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env['GIT_INDEX_FILE'] = safe_decode(index.path) if PY3 else safe_encode(index.path)
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env['GIT_EDITOR'] = ':'
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try:
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cmd = subprocess.Popen([hp] + list(args),
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env=env,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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cwd=index.repo.working_dir,
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close_fds=is_posix,
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creationflags=PROC_CREATIONFLAGS,)
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except Exception as ex:
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raise HookExecutionError(hp, ex)
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else:
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stdout = []
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stderr = []
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handle_process_output(cmd, stdout.append, stderr.append, finalize_process)
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stdout = ''.join(stdout)
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stderr = ''.join(stderr)
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if cmd.returncode != 0:
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stdout = force_text(stdout, defenc)
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stderr = force_text(stderr, defenc)
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raise HookExecutionError(hp, cmd.returncode, stderr, stdout)
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# end handle return code
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def stat_mode_to_index_mode(mode):
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"""Convert the given mode from a stat call to the corresponding index mode
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and return it"""
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if S_ISLNK(mode): # symlinks
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return S_IFLNK
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if S_ISDIR(mode) or S_IFMT(mode) == S_IFGITLINK: # submodules
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return S_IFGITLINK
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return S_IFREG | 0o644 | (mode & 0o111) # blobs with or without executable bit
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def write_cache(entries, stream, extension_data=None, ShaStreamCls=IndexFileSHA1Writer):
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"""Write the cache represented by entries to a stream
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:param entries: **sorted** list of entries
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:param stream: stream to wrap into the AdapterStreamCls - it is used for
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final output.
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:param ShaStreamCls: Type to use when writing to the stream. It produces a sha
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while writing to it, before the data is passed on to the wrapped stream
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:param extension_data: any kind of data to write as a trailer, it must begin
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a 4 byte identifier, followed by its size ( 4 bytes )"""
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# wrap the stream into a compatible writer
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stream = ShaStreamCls(stream)
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tell = stream.tell
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write = stream.write
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# header
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version = 2
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write(b"DIRC")
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write(pack(">LL", version, len(entries)))
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# body
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for entry in entries:
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beginoffset = tell()
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write(entry[4]) # ctime
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write(entry[5]) # mtime
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path = entry[3]
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path = force_bytes(path, encoding=defenc)
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plen = len(path) & CE_NAMEMASK # path length
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assert plen == len(path), "Path %s too long to fit into index" % entry[3]
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flags = plen | (entry[2] & CE_NAMEMASK_INV) # clear possible previous values
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write(pack(">LLLLLL20sH", entry[6], entry[7], entry[0],
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entry[8], entry[9], entry[10], entry[1], flags))
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write(path)
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real_size = ((tell() - beginoffset + 8) & ~7)
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write(b"\0" * ((beginoffset + real_size) - tell()))
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# END for each entry
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# write previously cached extensions data
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if extension_data is not None:
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stream.write(extension_data)
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# write the sha over the content
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stream.write_sha()
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def read_header(stream):
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"""Return tuple(version_long, num_entries) from the given stream"""
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type_id = stream.read(4)
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if type_id != b"DIRC":
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raise AssertionError("Invalid index file header: %r" % type_id)
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version, num_entries = unpack(">LL", stream.read(4 * 2))
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# TODO: handle version 3: extended data, see read-cache.c
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assert version in (1, 2)
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return version, num_entries
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def entry_key(*entry):
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""":return: Key suitable to be used for the index.entries dictionary
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:param entry: One instance of type BaseIndexEntry or the path and the stage"""
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if len(entry) == 1:
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return (entry[0].path, entry[0].stage)
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else:
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return tuple(entry)
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# END handle entry
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def read_cache(stream):
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"""Read a cache file from the given stream
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:return: tuple(version, entries_dict, extension_data, content_sha)
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* version is the integer version number
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* entries dict is a dictionary which maps IndexEntry instances to a path at a stage
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* extension_data is '' or 4 bytes of type + 4 bytes of size + size bytes
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* content_sha is a 20 byte sha on all cache file contents"""
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version, num_entries = read_header(stream)
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count = 0
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entries = {}
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read = stream.read
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tell = stream.tell
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while count < num_entries:
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beginoffset = tell()
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ctime = unpack(">8s", read(8))[0]
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mtime = unpack(">8s", read(8))[0]
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(dev, ino, mode, uid, gid, size, sha, flags) = \
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unpack(">LLLLLL20sH", read(20 + 4 * 6 + 2))
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path_size = flags & CE_NAMEMASK
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path = read(path_size).decode(defenc)
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real_size = ((tell() - beginoffset + 8) & ~7)
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read((beginoffset + real_size) - tell())
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entry = IndexEntry((mode, sha, flags, path, ctime, mtime, dev, ino, uid, gid, size))
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# entry_key would be the method to use, but we safe the effort
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entries[(path, entry.stage)] = entry
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count += 1
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# END for each entry
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# the footer contains extension data and a sha on the content so far
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# Keep the extension footer,and verify we have a sha in the end
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# Extension data format is:
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# 4 bytes ID
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# 4 bytes length of chunk
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# repeated 0 - N times
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extension_data = stream.read(~0)
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assert len(extension_data) > 19, "Index Footer was not at least a sha on content as it was only %i bytes in size"\
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% len(extension_data)
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content_sha = extension_data[-20:]
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# truncate the sha in the end as we will dynamically create it anyway
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extension_data = extension_data[:-20]
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return (version, entries, extension_data, content_sha)
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def write_tree_from_cache(entries, odb, sl, si=0):
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"""Create a tree from the given sorted list of entries and put the respective
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trees into the given object database
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:param entries: **sorted** list of IndexEntries
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:param odb: object database to store the trees in
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:param si: start index at which we should start creating subtrees
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:param sl: slice indicating the range we should process on the entries list
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:return: tuple(binsha, list(tree_entry, ...)) a tuple of a sha and a list of
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tree entries being a tuple of hexsha, mode, name"""
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tree_items = []
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tree_items_append = tree_items.append
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ci = sl.start
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end = sl.stop
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while ci < end:
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entry = entries[ci]
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if entry.stage != 0:
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raise UnmergedEntriesError(entry)
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# END abort on unmerged
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ci += 1
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rbound = entry.path.find('/', si)
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if rbound == -1:
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# its not a tree
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tree_items_append((entry.binsha, entry.mode, entry.path[si:]))
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else:
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# find common base range
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base = entry.path[si:rbound]
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xi = ci
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while xi < end:
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oentry = entries[xi]
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orbound = oentry.path.find('/', si)
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if orbound == -1 or oentry.path[si:orbound] != base:
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break
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# END abort on base mismatch
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xi += 1
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# END find common base
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# enter recursion
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# ci - 1 as we want to count our current item as well
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sha, tree_entry_list = write_tree_from_cache(entries, odb, slice(ci - 1, xi), rbound + 1) # @UnusedVariable
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tree_items_append((sha, S_IFDIR, base))
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# skip ahead
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ci = xi
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# END handle bounds
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# END for each entry
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# finally create the tree
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sio = BytesIO()
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tree_to_stream(tree_items, sio.write)
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sio.seek(0)
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istream = odb.store(IStream(str_tree_type, len(sio.getvalue()), sio))
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return (istream.binsha, tree_items)
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def _tree_entry_to_baseindexentry(tree_entry, stage):
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return BaseIndexEntry((tree_entry[1], tree_entry[0], stage << CE_STAGESHIFT, tree_entry[2]))
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def aggressive_tree_merge(odb, tree_shas):
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"""
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:return: list of BaseIndexEntries representing the aggressive merge of the given
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trees. All valid entries are on stage 0, whereas the conflicting ones are left
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on stage 1, 2 or 3, whereas stage 1 corresponds to the common ancestor tree,
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2 to our tree and 3 to 'their' tree.
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:param tree_shas: 1, 2 or 3 trees as identified by their binary 20 byte shas
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If 1 or two, the entries will effectively correspond to the last given tree
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If 3 are given, a 3 way merge is performed"""
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out = []
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out_append = out.append
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# one and two way is the same for us, as we don't have to handle an existing
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# index, instrea
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if len(tree_shas) in (1, 2):
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for entry in traverse_tree_recursive(odb, tree_shas[-1], ''):
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out_append(_tree_entry_to_baseindexentry(entry, 0))
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# END for each entry
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return out
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# END handle single tree
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if len(tree_shas) > 3:
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raise ValueError("Cannot handle %i trees at once" % len(tree_shas))
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# three trees
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for base, ours, theirs in traverse_trees_recursive(odb, tree_shas, ''):
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if base is not None:
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# base version exists
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if ours is not None:
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# ours exists
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if theirs is not None:
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# it exists in all branches, if it was changed in both
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# its a conflict, otherwise we take the changed version
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# This should be the most common branch, so it comes first
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if(base[0] != ours[0] and base[0] != theirs[0] and ours[0] != theirs[0]) or \
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(base[1] != ours[1] and base[1] != theirs[1] and ours[1] != theirs[1]):
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# changed by both
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out_append(_tree_entry_to_baseindexentry(base, 1))
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out_append(_tree_entry_to_baseindexentry(ours, 2))
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out_append(_tree_entry_to_baseindexentry(theirs, 3))
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elif base[0] != ours[0] or base[1] != ours[1]:
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# only we changed it
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out_append(_tree_entry_to_baseindexentry(ours, 0))
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else:
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# either nobody changed it, or they did. In either
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# case, use theirs
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out_append(_tree_entry_to_baseindexentry(theirs, 0))
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# END handle modification
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else:
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if ours[0] != base[0] or ours[1] != base[1]:
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# they deleted it, we changed it, conflict
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out_append(_tree_entry_to_baseindexentry(base, 1))
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out_append(_tree_entry_to_baseindexentry(ours, 2))
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# else:
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# we didn't change it, ignore
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# pass
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# END handle our change
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# END handle theirs
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else:
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if theirs is None:
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# deleted in both, its fine - its out
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pass
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else:
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if theirs[0] != base[0] or theirs[1] != base[1]:
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# deleted in ours, changed theirs, conflict
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out_append(_tree_entry_to_baseindexentry(base, 1))
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out_append(_tree_entry_to_baseindexentry(theirs, 3))
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# END theirs changed
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# else:
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# theirs didn't change
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# pass
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# END handle theirs
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# END handle ours
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else:
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# all three can't be None
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if ours is None:
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# added in their branch
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out_append(_tree_entry_to_baseindexentry(theirs, 0))
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elif theirs is None:
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# added in our branch
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out_append(_tree_entry_to_baseindexentry(ours, 0))
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else:
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# both have it, except for the base, see whether it changed
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if ours[0] != theirs[0] or ours[1] != theirs[1]:
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out_append(_tree_entry_to_baseindexentry(ours, 2))
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out_append(_tree_entry_to_baseindexentry(theirs, 3))
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else:
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# it was added the same in both
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out_append(_tree_entry_to_baseindexentry(ours, 0))
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# END handle two items
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# END handle heads
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# END handle base exists
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# END for each entries tuple
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return out
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