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breezy
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diff.py
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# Copyright (C) 2005-2014 Canonical Ltd. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA import contextlib import difflib import os import re import sys from typing import Optional, Union from .lazy_import import lazy_import lazy_import( globals(), """ import errno import patiencediff import subprocess from breezy import ( controldir, textfile, timestamp, views, ) from breezy.workingtree import WorkingTree from breezy.i18n import gettext """, ) from . import errors, osutils from . import transport as _mod_transport from .registry import Registry from .trace import mutter, note, warning from .tree import FileTimestampUnavailable, Tree DEFAULT_CONTEXT_AMOUNT = 3 # TODO: Rather than building a changeset object, we should probably # invoke callbacks on an object. That object can either accumulate a # list, write them out directly, etc etc. class _PrematchedMatcher(difflib.SequenceMatcher): """Allow SequenceMatcher operations to use predetermined blocks.""" def __init__(self, matching_blocks): difflib.SequenceMatcher(self, None, None) self.matching_blocks = matching_blocks self.opcodes = None def internal_diff( old_label, oldlines, new_label, newlines, to_file, allow_binary=False, sequence_matcher=None, path_encoding="utf8", context_lines=DEFAULT_CONTEXT_AMOUNT, ): # FIXME: difflib is wrong if there is no trailing newline. # The syntax used by patch seems to be "\ No newline at # end of file" following the last diff line from that # file. This is not trivial to insert into the # unified_diff output and it might be better to just fix # or replace that function. # In the meantime we at least make sure the patch isn't # mangled. if allow_binary is False: textfile.check_text_lines(oldlines) textfile.check_text_lines(newlines) if sequence_matcher is None: sequence_matcher = patiencediff.PatienceSequenceMatcher ud = unified_diff_bytes( oldlines, newlines, fromfile=old_label.encode(path_encoding, "replace"), tofile=new_label.encode(path_encoding, "replace"), n=context_lines, sequencematcher=sequence_matcher, ) ud = list(ud) if len(ud) == 0: # Identical contents, nothing to do return # work-around for difflib being too smart for its own good # if /dev/null is "1,0", patch won't recognize it as /dev/null if not oldlines: ud[2] = ud[2].replace(b"-1,0", b"-0,0") elif not newlines: ud[2] = ud[2].replace(b"+1,0", b"+0,0") for line in ud: to_file.write(line) if not line.endswith(b"\n"): to_file.write(b"\n\\ No newline at end of file\n") to_file.write(b"\n") def unified_diff_bytes( a, b, fromfile=b"", tofile=b"", fromfiledate=b"", tofiledate=b"", n=3, lineterm=b"\n", sequencematcher=None, ): r"""Compare two sequences of lines; generate the delta as a unified diff. Unified diffs are a compact way of showing line changes and a few lines of context. The number of context lines is set by 'n' which defaults to three. By default, the diff control lines (those with ---, +++, or @@) are created with a trailing newline. This is helpful so that inputs created from file.readlines() result in diffs that are suitable for file.writelines() since both the inputs and outputs have trailing newlines. For inputs that do not have trailing newlines, set the lineterm argument to "" so that the output will be uniformly newline free. The unidiff format normally has a header for filenames and modification times. Any or all of these may be specified using strings for 'fromfile', 'tofile', 'fromfiledate', and 'tofiledate'. The modification times are normally expressed in the format returned by time.ctime(). Example: >>> for line in bytes_unified_diff(b'one two three four'.split(), ... b'zero one tree four'.split(), b'Original', b'Current', ... b'Sat Jan 26 23:30:50 1991', b'Fri Jun 06 10:20:52 2003', ... lineterm=b''): ... print line --- Original Sat Jan 26 23:30:50 1991 +++ Current Fri Jun 06 10:20:52 2003 @@ -1,4 +1,4 @@ +zero one -two -three +tree four """ if sequencematcher is None: sequencematcher = difflib.SequenceMatcher if fromfiledate: fromfiledate = b"\t" + bytes(fromfiledate) if tofiledate: tofiledate = b"\t" + bytes(tofiledate) started = False for group in sequencematcher(None, a, b).get_grouped_opcodes(n): if not started: yield b"--- %s%s%s" % (fromfile, fromfiledate, lineterm) yield b"+++ %s%s%s" % (tofile, tofiledate, lineterm) started = True i1, i2, j1, j2 = group[0][1], group[-1][2], group[0][3], group[-1][4] yield b"@@ -%d,%d +%d,%d @@%s" % (i1 + 1, i2 - i1, j1 + 1, j2 - j1, lineterm) for tag, i1, i2, j1, j2 in group: if tag == "equal": for line in a[i1:i2]: yield b" " + line continue if tag == "replace" or tag == "delete": for line in a[i1:i2]: yield b"-" + line if tag == "replace" or tag == "insert": for line in b[j1:j2]: yield b"+" + line def _spawn_external_diff(diffcmd, capture_errors=True): """Spawn the external diff process, and return the child handle. :param diffcmd: The command list to spawn :param capture_errors: Capture stderr as well as setting LANG=C and LC_ALL=C. This lets us read and understand the output of diff, and respond to any errors. :return: A Popen object. """ if capture_errors: # construct minimal environment env = {} path = os.environ.get("PATH") if path is not None: env["PATH"] = path env["LANGUAGE"] = "C" # on win32 only LANGUAGE has effect env["LANG"] = "C" env["LC_ALL"] = "C" stderr = subprocess.PIPE else: env = None stderr = None try: pipe = subprocess.Popen( diffcmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=stderr, env=env, ) except OSError as e: if e.errno == errno.ENOENT: raise errors.NoDiff(str(e)) raise return pipe # diff style options as of GNU diff v3.2 style_option_list = [ "-c", "-C", "--context", "-e", "--ed", "-f", "--forward-ed", "-q", "--brief", "--normal", "-n", "--rcs", "-u", "-U", "--unified", "-y", "--side-by-side", "-D", "--ifdef", ] def default_style_unified(diff_opts): """Default to unified diff style if alternative not specified in diff_opts. diff only allows one style to be specified; they don't override. Note that some of these take optargs, and the optargs can be directly appended to the options. This is only an approximate parser; it doesn't properly understand the grammar. :param diff_opts: List of options for external (GNU) diff. :return: List of options with default style=='unified'. """ for s in style_option_list: for j in diff_opts: if j.startswith(s): break else: continue break else: diff_opts.append("-u") return diff_opts def external_diff(old_label, oldlines, new_label, newlines, to_file, diff_opts): """Display a diff by calling out to the external diff program.""" import tempfile # make sure our own output is properly ordered before the diff to_file.flush() oldtmp_fd, old_abspath = tempfile.mkstemp(prefix="brz-diff-old-") newtmp_fd, new_abspath = tempfile.mkstemp(prefix="brz-diff-new-") oldtmpf = os.fdopen(oldtmp_fd, "wb") newtmpf = os.fdopen(newtmp_fd, "wb") try: # TODO: perhaps a special case for comparing to or from the empty # sequence; can just use /dev/null on Unix # TODO: if either of the files being compared already exists as a # regular named file (e.g. in the working directory) then we can # compare directly to that, rather than copying it. oldtmpf.writelines(oldlines) newtmpf.writelines(newlines) oldtmpf.close() newtmpf.close() if not diff_opts: diff_opts = [] if sys.platform == "win32": # Popen doesn't do the proper encoding for external commands # Since we are dealing with an ANSI api, use mbcs encoding old_label = old_label.encode("mbcs") new_label = new_label.encode("mbcs") diffcmd = [ "diff", "--label", old_label, old_abspath, "--label", new_label, new_abspath, "--binary", ] diff_opts = default_style_unified(diff_opts) if diff_opts: diffcmd.extend(diff_opts) pipe = _spawn_external_diff(diffcmd, capture_errors=True) out, err = pipe.communicate() rc = pipe.returncode # internal_diff() adds a trailing newline, add one here for consistency out += b"\n" if rc == 2: # 'diff' gives retcode == 2 for all sorts of errors # one of those is 'Binary files differ'. # Bad options could also be the problem. # 'Binary files' is not a real error, so we suppress that error. lang_c_out = out # Since we got here, we want to make sure to give an i18n error pipe = _spawn_external_diff(diffcmd, capture_errors=False) out, err = pipe.communicate() # Write out the new i18n diff response to_file.write(out + b"\n") if pipe.returncode != 2: raise errors.BzrError( "external diff failed with exit code 2" " when run with LANG=C and LC_ALL=C," " but not when run natively: {!r}".format(diffcmd) ) first_line = lang_c_out.split(b"\n", 1)[0] # Starting with diffutils 2.8.4 the word "binary" was dropped. m = re.match(b"^(binary )?files.*differ$", first_line, re.I) if m is None: raise errors.BzrError( "external diff failed with exit code 2; command: {!r}".format( diffcmd ) ) else: # Binary files differ, just return return # If we got to here, we haven't written out the output of diff # do so now to_file.write(out) if rc not in (0, 1): # returns 1 if files differ; that's OK if rc < 0: msg = f"signal {-rc}" else: msg = f"exit code {rc}" raise errors.BzrError( "external diff failed with {}; command: {!r}".format(msg, diffcmd) ) finally: oldtmpf.close() # and delete newtmpf.close() def cleanup(path): # Warn in case the file couldn't be deleted (in case windows still # holds the file open, but not if the files have already been # deleted) try: os.remove(path) except OSError as e: if e.errno not in (errno.ENOENT,): warning("Failed to delete temporary file: %s %s", path, e) cleanup(old_abspath) cleanup(new_abspath) def get_trees_and_branches_to_diff_locked( path_list, revision_specs, old_url, new_url, exit_stack, apply_view=True ): """Get the trees and specific files to diff given a list of paths. This method works out the trees to be diff'ed and the files of interest within those trees. :param path_list: the list of arguments passed to the diff command :param revision_specs: Zero, one or two RevisionSpecs from the diff command line, saying what revisions to compare. :param old_url: The url of the old branch or tree. If None, the tree to use is taken from the first path, if any, or the current working tree. :param new_url: The url of the new branch or tree. If None, the tree to use is taken from the first path, if any, or the current working tree. :param exit_stack: an ExitStack object. get_trees_and_branches_to_diff will register cleanups that must be run to unlock the trees, etc. :param apply_view: if True and a view is set, apply the view or check that the paths are within it :returns: a tuple of (old_tree, new_tree, old_branch, new_branch, specific_files, extra_trees) where extra_trees is a sequence of additional trees to search in for file-ids. The trees and branches will be read-locked until the cleanups registered via the exit_stack param are run. """ # Get the old and new revision specs old_revision_spec = None new_revision_spec = None if revision_specs is not None: if len(revision_specs) > 0: old_revision_spec = revision_specs[0] if old_url is None: old_url = old_revision_spec.get_branch() if len(revision_specs) > 1: new_revision_spec = revision_specs[1] if new_url is None: new_url = new_revision_spec.get_branch() other_paths = [] make_paths_wt_relative = True consider_relpath = True if path_list is None or len(path_list) == 0: # If no path is given, the current working tree is used default_location = "." consider_relpath = False elif old_url is not None and new_url is not None: other_paths = path_list make_paths_wt_relative = False else: default_location = path_list[0] other_paths = path_list[1:] def lock_tree_or_branch(wt, br): if wt is not None: exit_stack.enter_context(wt.lock_read()) elif br is not None: exit_stack.enter_context(br.lock_read()) # Get the old location specific_files = [] if old_url is None: old_url = default_location working_tree, branch, relpath = ( controldir.ControlDir.open_containing_tree_or_branch(old_url) ) lock_tree_or_branch(working_tree, branch) if consider_relpath and relpath != "": if working_tree is not None and apply_view: views.check_path_in_view(working_tree, relpath) specific_files.append(relpath) old_tree = _get_tree_to_diff(old_revision_spec, working_tree, branch) old_branch = branch # Get the new location if new_url is None: new_url = default_location if new_url != old_url: working_tree, branch, relpath = ( controldir.ControlDir.open_containing_tree_or_branch(new_url) ) lock_tree_or_branch(working_tree, branch) if consider_relpath and relpath != "": if working_tree is not None and apply_view: views.check_path_in_view(working_tree, relpath) specific_files.append(relpath) new_tree = _get_tree_to_diff( new_revision_spec, working_tree, branch, basis_is_default=working_tree is None ) new_branch = branch # Get the specific files (all files is None, no files is []) if make_paths_wt_relative and working_tree is not None: other_paths = working_tree.safe_relpath_files( other_paths, apply_view=apply_view ) specific_files.extend(other_paths) if len(specific_files) == 0: specific_files = None if working_tree is not None and working_tree.supports_views() and apply_view: view_files = working_tree.views.lookup_view() if view_files: specific_files = view_files view_str = views.view_display_str(view_files) note(gettext("*** Ignoring files outside view. View is %s") % view_str) # Get extra trees that ought to be searched for file-ids extra_trees = None if working_tree is not None and working_tree not in (old_tree, new_tree): extra_trees = (working_tree,) return (old_tree, new_tree, old_branch, new_branch, specific_files, extra_trees) def _get_tree_to_diff(spec, tree=None, branch=None, basis_is_default=True): if branch is None and tree is not None: branch = tree.branch if spec is None or spec.spec is None: if basis_is_default: if tree is not None: return tree.basis_tree() else: return branch.basis_tree() else: return tree return spec.as_tree(branch) def show_diff_trees( old_tree, new_tree, to_file, specific_files=None, external_diff_options=None, old_label: str = "a/", new_label: str = "b/", extra_trees=None, path_encoding: str = "utf8", using: Optional[str] = None, format_cls=None, context=DEFAULT_CONTEXT_AMOUNT, ): """Show in text form the changes from one tree to another. :param to_file: The output stream. :param specific_files: Include only changes to these files - None for all changes. :param external_diff_options: If set, use an external GNU diff and pass these options. :param extra_trees: If set, more Trees to use for looking up file ids :param path_encoding: If set, the path will be encoded as specified, otherwise is supposed to be utf8 :param format_cls: Formatter class (DiffTree subclass) """ if context is None: context = DEFAULT_CONTEXT_AMOUNT if format_cls is None: format_cls = DiffTree with contextlib.ExitStack() as exit_stack: exit_stack.enter_context(old_tree.lock_read()) if extra_trees is not None: for tree in extra_trees: exit_stack.enter_context(tree.lock_read()) exit_stack.enter_context(new_tree.lock_read()) differ = format_cls.from_trees_options( old_tree, new_tree, to_file, path_encoding, external_diff_options, old_label, new_label, using, context_lines=context, ) return differ.show_diff(specific_files, extra_trees) def _patch_header_date(tree, path): """Returns a timestamp suitable for use in a patch header.""" try: mtime = tree.get_file_mtime(path) except FileTimestampUnavailable: mtime = 0 return timestamp.format_patch_date(mtime) def get_executable_change(old_is_x, new_is_x): descr = {True: b"+x", False: b"-x", None: b"??"} if old_is_x != new_is_x: return [ b"%s to %s" % ( descr[old_is_x], descr[new_is_x], ) ] else: return [] class DiffPath: """Base type for command object that compare files.""" # The type or contents of the file were unsuitable for diffing CANNOT_DIFF = "CANNOT_DIFF" # The file has changed in a semantic way CHANGED = "CHANGED" # The file content may have changed, but there is no semantic change UNCHANGED = "UNCHANGED" def __init__(self, old_tree, new_tree, to_file, path_encoding="utf-8"): """Constructor. :param old_tree: The tree to show as the old tree in the comparison :param new_tree: The tree to show as new in the comparison :param to_file: The file to write comparison data to :param path_encoding: The character encoding to write paths in """ self.old_tree = old_tree self.new_tree = new_tree self.to_file = to_file self.path_encoding = path_encoding def finish(self): pass @classmethod def from_diff_tree(klass, diff_tree): return klass( diff_tree.old_tree, diff_tree.new_tree, diff_tree.to_file, diff_tree.path_encoding, ) @staticmethod def _diff_many(differs, old_path, new_path, old_kind, new_kind): for file_differ in differs: result = file_differ.diff(old_path, new_path, old_kind, new_kind) if result is not DiffPath.CANNOT_DIFF: return result else: return DiffPath.CANNOT_DIFF class DiffKindChange: """Special differ for file kind changes. Represents kind change as deletion + creation. Uses the other differs to do this. """ def __init__(self, differs): self.differs = differs def finish(self): pass @classmethod def from_diff_tree(klass, diff_tree): return klass(diff_tree.differs) def diff(self, old_path, new_path, old_kind, new_kind): """Perform comparison. :param old_path: Path of the file in the old tree :param new_path: Path of the file in the new tree :param old_kind: Old file-kind of the file :param new_kind: New file-kind of the file """ if None in (old_kind, new_kind): return DiffPath.CANNOT_DIFF result = DiffPath._diff_many(self.differs, old_path, new_path, old_kind, None) if result is DiffPath.CANNOT_DIFF: return result return DiffPath._diff_many(self.differs, old_path, new_path, None, new_kind) class DiffTreeReference(DiffPath): def diff(self, old_path, new_path, old_kind, new_kind): """Perform comparison between two tree references. (dummy).""" if "tree-reference" not in (old_kind, new_kind): return self.CANNOT_DIFF if old_kind not in ("tree-reference", None): return self.CANNOT_DIFF if new_kind not in ("tree-reference", None): return self.CANNOT_DIFF return self.CHANGED class DiffDirectory(DiffPath): def diff(self, old_path, new_path, old_kind, new_kind): """Perform comparison between two directories. (dummy).""" if "directory" not in (old_kind, new_kind): return self.CANNOT_DIFF if old_kind not in ("directory", None): return self.CANNOT_DIFF if new_kind not in ("directory", None): return self.CANNOT_DIFF return self.CHANGED class DiffSymlink(DiffPath): def diff(self, old_path, new_path, old_kind, new_kind): """Perform comparison between two symlinks. :param old_path: Path of the file in the old tree :param new_path: Path of the file in the new tree :param old_kind: Old file-kind of the file :param new_kind: New file-kind of the file """ if "symlink" not in (old_kind, new_kind): return self.CANNOT_DIFF if old_kind == "symlink": old_target = self.old_tree.get_symlink_target(old_path) elif old_kind is None: old_target = None else: return self.CANNOT_DIFF if new_kind == "symlink": new_target = self.new_tree.get_symlink_target(new_path) elif new_kind is None: new_target = None else: return self.CANNOT_DIFF return self.diff_symlink(old_target, new_target) def diff_symlink(self, old_target, new_target): if old_target is None: self.to_file.write( b"=== target is '%s'\n" % new_target.encode(self.path_encoding, "replace") ) elif new_target is None: self.to_file.write( b"=== target was '%s'\n" % old_target.encode(self.path_encoding, "replace") ) else: self.to_file.write( b"=== target changed '%s' => '%s'\n" % ( old_target.encode(self.path_encoding, "replace"), new_target.encode(self.path_encoding, "replace"), ) ) return self.CHANGED class DiffText(DiffPath): # GNU Patch uses the epoch date to detect files that are being added # or removed in a diff. EPOCH_DATE = "1970-01-01 00:00:00 +0000" def __init__( self, old_tree, new_tree, to_file, path_encoding="utf-8", old_label="", new_label="", text_differ=internal_diff, context_lines=DEFAULT_CONTEXT_AMOUNT, ): DiffPath.__init__(self, old_tree, new_tree, to_file, path_encoding) self.text_differ = text_differ self.old_label = old_label self.new_label = new_label self.path_encoding = path_encoding self.context_lines = context_lines def diff(self, old_path, new_path, old_kind, new_kind): """Compare two files in unified diff format. :param old_path: Path of the file in the old tree :param new_path: Path of the file in the new tree :param old_kind: Old file-kind of the file :param new_kind: New file-kind of the file """ if "file" not in (old_kind, new_kind): return self.CANNOT_DIFF if old_kind == "file": old_date = _patch_header_date(self.old_tree, old_path) elif old_kind is None: old_date = self.EPOCH_DATE else: return self.CANNOT_DIFF if new_kind == "file": new_date = _patch_header_date(self.new_tree, new_path) elif new_kind is None: new_date = self.EPOCH_DATE else: return self.CANNOT_DIFF from_label = "{}{}\t{}".format(self.old_label, old_path or new_path, old_date) to_label = "{}{}\t{}".format(self.new_label, new_path or old_path, new_date) return self.diff_text(old_path, new_path, from_label, to_label) def diff_text(self, from_path, to_path, from_label, to_label): """Diff the content of given files in two trees. :param from_path: The path in the from tree. If None, the file is not present in the from tree. :param to_path: The path in the to tree. This may refer to a different file from from_path. If None, the file is not present in the to tree. """ def _get_text(tree, path): if path is None: return [] try: return tree.get_file_lines(path) except _mod_transport.NoSuchFile: return [] try: from_text = _get_text(self.old_tree, from_path) to_text = _get_text(self.new_tree, to_path) self.text_differ( from_label, from_text, to_label, to_text, self.to_file, path_encoding=self.path_encoding, context_lines=self.context_lines, ) except errors.BinaryFile: self.to_file.write( ( "Binary files {}{} and {}{} differ\n".format( self.old_label, from_path or to_path, self.new_label, to_path or from_path, ) ).encode(self.path_encoding, "replace") ) return self.CHANGED class DiffFromTool(DiffPath): def __init__( self, command_template: Union[str, list[str]], old_tree: Tree, new_tree: Tree, to_file, path_encoding="utf-8", ): import tempfile DiffPath.__init__(self, old_tree, new_tree, to_file, path_encoding) self.command_template = command_template self._root = tempfile.mkdtemp(prefix="brz-diff-") @classmethod def from_string( klass, command_template: Union[str, list[str]], old_tree: Tree, new_tree: Tree, to_file, path_encoding: str = "utf-8", ): return klass(command_template, old_tree, new_tree, to_file, path_encoding) @classmethod def make_from_diff_tree(klass, command_string, external_diff_options=None): def from_diff_tree(diff_tree): full_command_string = [command_string] if external_diff_options is not None: full_command_string.extend(external_diff_options.split()) return klass.from_string( full_command_string, diff_tree.old_tree, diff_tree.new_tree, diff_tree.to_file, ) return from_diff_tree def _get_command(self, old_path, new_path): my_map = {"old_path": old_path, "new_path": new_path} command = [t.format(**my_map) for t in self.command_template] if command == self.command_template: command += [old_path, new_path] if sys.platform == "win32": # Popen doesn't accept unicode on win32 command_encoded = [] for c in command: if isinstance(c, str): command_encoded.append(c.encode("mbcs")) else: command_encoded.append(c) return command_encoded else: return command def _execute(self, old_path, new_path): command = self._get_command(old_path, new_path) try: proc = subprocess.Popen(command, stdout=subprocess.PIPE, cwd=self._root) except OSError as e: if e.errno == errno.ENOENT: raise errors.ExecutableMissing(command[0]) else: raise self.to_file.write(proc.stdout.read()) proc.stdout.close() return proc.wait() def _try_symlink_root(self, tree, prefix): if getattr(tree, "abspath", None) is None or not osutils.supports_symlinks( self._root ): return False try: os.symlink(tree.abspath(""), osutils.pathjoin(self._root, prefix)) except OSError as e: if e.errno != errno.EEXIST: raise return True @staticmethod def _fenc(): """Returns safe encoding for passing file path to diff tool.""" if sys.platform == "win32": return "mbcs" else: # Don't fallback to 'utf-8' because subprocess may not be able to # handle utf-8 correctly when locale is not utf-8. return sys.getfilesystemencoding() or "ascii" def _is_safepath(self, path): """Return true if `path` may be able to pass to subprocess.""" fenc = self._fenc() try: return path == path.encode(fenc).decode(fenc) except UnicodeError: return False def _safe_filename(self, prefix, relpath): """Replace unsafe character in `relpath` then join `self._root`, `prefix` and `relpath`. """ fenc = self._fenc() # encoded_str.replace('?', '_') may break multibyte char. # So we should encode, decode, then replace(u'?', u'_') relpath_tmp = relpath.encode(fenc, "replace").decode(fenc, "replace") relpath_tmp = relpath_tmp.replace("?", "_") return osutils.pathjoin(self._root, prefix, relpath_tmp) def _write_file(self, relpath, tree, prefix, force_temp=False, allow_write=False): if not force_temp and isinstance(tree, WorkingTree): full_path = tree.abspath(relpath) if self._is_safepath(full_path): return full_path full_path = self._safe_filename(prefix, relpath) if not force_temp and self._try_symlink_root(tree, prefix): return full_path parent_dir = osutils.dirname(full_path) try: os.makedirs(parent_dir) except OSError as e: if e.errno != errno.EEXIST: raise with tree.get_file(relpath) as source, open(full_path, "wb") as target: osutils.pumpfile(source, target) try: mtime = tree.get_file_mtime(relpath) except FileTimestampUnavailable: pass else: os.utime(full_path, (mtime, mtime)) if not allow_write: osutils.make_readonly(full_path) return full_path def _prepare_files( self, old_path, new_path, force_temp=False, allow_write_new=False ): old_disk_path = self._write_file(old_path, self.old_tree, "old", force_temp) new_disk_path = self._write_file( new_path, self.new_tree, "new", force_temp, allow_write=allow_write_new ) return old_disk_path, new_disk_path def finish(self): try: osutils.rmtree(self._root) except OSError as e: if e.errno != errno.ENOENT: mutter( 'The temporary directory "{}" was not cleanly removed: {}.'.format( self._root, e ) ) def diff(self, old_path, new_path, old_kind, new_kind): if (old_kind, new_kind) != ("file", "file"): return DiffPath.CANNOT_DIFF (old_disk_path, new_disk_path) = self._prepare_files(old_path, new_path) self._execute(old_disk_path, new_disk_path) def edit_file(self, old_path, new_path): """Use this tool to edit a file. A temporary copy will be edited, and the new contents will be returned. :return: The new contents of the file. """ old_abs_path, new_abs_path = self._prepare_files( old_path, new_path, allow_write_new=True, force_temp=True ) command = self._get_command(old_abs_path, new_abs_path) subprocess.call(command, cwd=self._root) with open(new_abs_path, "rb") as new_file: return new_file.read() class DiffTree: """Provides textual representations of the difference between two trees. A DiffTree examines two trees and where a file-id has altered between them, generates a textual representation of the difference. DiffTree uses a sequence of DiffPath objects which are each given the opportunity to handle a given altered fileid. The list of DiffPath objects can be extended globally by appending to DiffTree.diff_factories, or for a specific diff operation by supplying the extra_factories option to the appropriate method. """ # list of factories that can provide instances of DiffPath objects # may be extended by plugins. diff_factories = [ DiffSymlink.from_diff_tree, DiffDirectory.from_diff_tree, DiffTreeReference.from_diff_tree, ] def __init__( self, old_tree, new_tree, to_file, path_encoding="utf-8", diff_text=None, extra_factories=None, ): """Constructor. :param old_tree: Tree to show as old in the comparison :param new_tree: Tree to show as new in the comparison :param to_file: File to write comparision to :param path_encoding: Character encoding to write paths in :param diff_text: DiffPath-type object to use as a last resort for diffing text files. :param extra_factories: Factories of DiffPaths to try before any other DiffPaths """ if diff_text is None: diff_text = DiffText( old_tree, new_tree, to_file, path_encoding, "", "", internal_diff ) self.old_tree = old_tree self.new_tree = new_tree self.to_file = to_file self.path_encoding = path_encoding self.differs = [] if extra_factories is not None: self.differs.extend(f(self) for f in extra_factories) self.differs.extend(f(self) for f in self.diff_factories) self.differs.extend([diff_text, DiffKindChange.from_diff_tree(self)]) @classmethod def from_trees_options( klass, old_tree, new_tree, to_file, path_encoding, external_diff_options, old_label, new_label, using, context_lines, ): """Factory for producing a DiffTree. Designed to accept options used by show_diff_trees. :param old_tree: The tree to show as old in the comparison :param new_tree: The tree to show as new in the comparison :param to_file: File to write comparisons to :param path_encoding: Character encoding to use for writing paths :param external_diff_options: If supplied, use the installed diff binary to perform file comparison, using supplied options. :param old_label: Prefix to use for old file labels :param new_label: Prefix to use for new file labels :param using: Commandline to use to invoke an external diff tool """ if using is not None: extra_factories = [ DiffFromTool.make_from_diff_tree(using, external_diff_options) ] else: extra_factories = [] if external_diff_options: opts = external_diff_options.split() def diff_file( olab, olines, nlab, nlines, to_file, path_encoding=None, context_lines=None, ): """:param path_encoding: not used but required to match the signature of internal_diff. """ external_diff(olab, olines, nlab, nlines, to_file, opts) else: diff_file = internal_diff diff_text = DiffText( old_tree, new_tree, to_file, path_encoding, old_label, new_label, diff_file, context_lines=context_lines, ) return klass( old_tree, new_tree, to_file, path_encoding, diff_text, extra_factories ) def show_diff(self, specific_files, extra_trees=None): """Write tree diff to self.to_file. :param specific_files: the specific files to compare (recursive) :param extra_trees: extra trees to use for mapping paths to file_ids """ try: return self._show_diff(specific_files, extra_trees) finally: for differ in self.differs: differ.finish() def _show_diff(self, specific_files, extra_trees): # TODO: Generation of pseudo-diffs for added/deleted files could # be usefully made into a much faster special case. iterator = self.new_tree.iter_changes( self.old_tree, specific_files=specific_files, extra_trees=extra_trees, require_versioned=True, ) has_changes = 0 def changes_key(change): old_path, new_path = change.path path = new_path if path is None: path = old_path return path def get_encoded_path(path): if path is not None: return path.encode(self.path_encoding, "replace") for change in sorted(iterator, key=changes_key): # The root does not get diffed, and items with no known kind (that # is, missing) in both trees are skipped as well. if (not change.path[0] and not change.path[1]) or change.kind == ( None, None, ): continue if change.kind[0] == "symlink" and not self.new_tree.supports_symlinks(): warning( 'Ignoring "{}" as symlinks are not ' "supported on this filesystem.".format(change.path[0]) ) continue oldpath, newpath = change.path oldpath_encoded = get_encoded_path(oldpath) newpath_encoded = get_encoded_path(newpath) old_present = change.kind[0] is not None and change.versioned[0] new_present = change.kind[1] is not None and change.versioned[1] executable = change.executable kind = change.kind renamed = change.renamed properties_changed = [] properties_changed.extend( get_executable_change(executable[0], executable[1]) ) if properties_changed: prop_str = b" (properties changed: %s)" % ( b", ".join(properties_changed), ) else: prop_str = b"" if (old_present, new_present) == (True, False): self.to_file.write( b"=== removed %s '%s'\n" % (kind[0].encode("ascii"), oldpath_encoded) ) elif (old_present, new_present) == (False, True): self.to_file.write( b"=== added %s '%s'\n" % (kind[1].encode("ascii"), newpath_encoded) ) elif renamed: self.to_file.write( b"=== renamed %s '%s' => '%s'%s\n" % ( kind[0].encode("ascii"), oldpath_encoded, newpath_encoded, prop_str, ) ) else: # if it was produced by iter_changes, it must be # modified *somehow*, either content or execute bit. self.to_file.write( b"=== modified %s '%s'%s\n" % (kind[0].encode("ascii"), newpath_encoded, prop_str) ) if change.changed_content: self._diff(oldpath, newpath, kind[0], kind[1]) has_changes = 1 if renamed: has_changes = 1 return has_changes def diff(self, old_path, new_path): """Perform a diff of a single file. :param old_path: The path of the file in the old tree :param new_path: The path of the file in the new tree """ if old_path is None: old_kind = None else: old_kind = self.old_tree.kind(old_path) if new_path is None: new_kind = None else: new_kind = self.new_tree.kind(new_path) self._diff(old_path, new_path, old_kind, new_kind) def _diff(self, old_path, new_path, old_kind, new_kind): result = DiffPath._diff_many( self.differs, old_path, new_path, old_kind, new_kind ) if result is DiffPath.CANNOT_DIFF: error_path = new_path if error_path is None: error_path = old_path raise errors.NoDiffFound(error_path) format_registry = Registry[str, type[DiffTree]]() format_registry.register("default", DiffTree)