/brz/remove-bazaar

# Copyright (C) 2008-2011 Jelmer Vernooij <jelmer@samba.org>

#

# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""An adapter between a Git index and a Bazaar Working Tree"""

from cStringIO import (

    StringIO,

    )

from collections import defaultdict

import errno

from dulwich.errors import NotGitRepository

from dulwich.index import (

    Index,

    changes_from_tree,

    cleanup_mode,

    index_entry_from_stat,

    )

from dulwich.object_store import (

    tree_lookup_path,

    )

from dulwich.objects import (

    Blob,

    S_IFGITLINK,

    ZERO_SHA,

    )

from dulwich.repo import Repo

import os

import posixpath

import stat

import sys

from bzrlib import (

    errors,

    conflicts as _mod_conflicts,

    ignores,

    inventory,

    lock,

    osutils,

    trace,

    tree,

    workingtree,

    )

from bzrlib.decorators import (

    needs_read_lock,

    )

from bzrlib.mutabletree import needs_tree_write_lock

from bzrlib.plugins.git.dir import (

    LocalGitDir,

    )

from bzrlib.plugins.git.tree import (

    changes_from_git_changes,

    tree_delta_from_git_changes,

    )

from bzrlib.plugins.git.mapping import (

    GitFileIdMap,

    mode_kind,

    )

IGNORE_FILENAME = ".gitignore"

class GitWorkingTree(workingtree.WorkingTree):

    """A Git working tree."""

    def __init__(self, bzrdir, repo, branch, index):

        self.basedir = bzrdir.root_transport.local_abspath('.')

        self.bzrdir = bzrdir

        self.repository = repo

        self.store = self.repository._git.object_store

        self.mapping = self.repository.get_mapping()

        self._branch = branch

        self._transport = bzrdir.transport

        self._format = GitWorkingTreeFormat()

        self.index = index

        self._versioned_dirs = None

        self.views = self._make_views()

        self._rules_searcher = None

        self._detect_case_handling()

        self._reset_data()

        self._fileid_map = self._basis_fileid_map.copy()

        self._lock_mode = None

        self._lock_count = 0

    def lock_read(self):

        """Lock the repository for read operations.

        :return: A bzrlib.lock.LogicalLockResult.

        """

        if not self._lock_mode:

            self._lock_mode = 'r'

            self._lock_count = 1

            self.index.read()

        else:

            self._lock_count += 1

        self.branch.lock_read()

        return lock.LogicalLockResult(self.unlock)

    def lock_tree_write(self):

        if not self._lock_mode:

            self._lock_mode = 'w'

            self._lock_count = 1

            self.index.read()

        elif self._lock_mode == 'r':

            raise errors.ReadOnlyError(self)

        else:

            self._lock_count +=1

        self.branch.lock_read()

        return lock.LogicalLockResult(self.unlock)

    def lock_write(self, token=None):

        if not self._lock_mode:

            self._lock_mode = 'w'

            self._lock_count = 1

            self.index.read()

        elif self._lock_mode == 'r':

            raise errors.ReadOnlyError(self)

        else:

            self._lock_count +=1

        self.branch.lock_write()

        return lock.LogicalLockResult(self.unlock)

    def is_locked(self):

        return self._lock_count >= 1

    def get_physical_lock_status(self):

        return False

    def unlock(self):

        if not self._lock_count:

            return lock.cant_unlock_not_held(self)

        self.branch.unlock()

        self._cleanup()

        self._lock_count -= 1

        if self._lock_count > 0:

            return

        self._lock_mode = None

    def _detect_case_handling(self):

        try:

            self._transport.stat(".git/cOnFiG")

        except errors.NoSuchFile:

            self.case_sensitive = True

        else:

            self.case_sensitive = False

    def merge_modified(self):

        return {}

    def set_parent_trees(self, parents_list, allow_leftmost_as_ghost=False):

        self.set_parent_ids([p for p, t in parents_list])

    def _index_add_entry(self, path, file_id, kind):

        assert self._lock_mode is not None

        assert isinstance(path, basestring)

        assert type(file_id) == str or file_id is None

        if kind == "directory":

            # Git indexes don't contain directories

            return

        if kind == "file":

            blob = Blob()

            try:

                file, stat_val = self.get_file_with_stat(file_id, path)

            except (errors.NoSuchFile, IOError):

                # TODO: Rather than come up with something here, use the old index

                file = StringIO()

                stat_val = os.stat_result(

                    (stat.S_IFREG | 0644, 0, 0, 0, 0, 0, 0, 0, 0, 0))

            blob.set_raw_string(file.read())

        elif kind == "symlink":

            blob = Blob()

            try:

                stat_val = os.lstat(self.abspath(path))

            except (errors.NoSuchFile, OSError):

                # TODO: Rather than come up with something here, use the 

                # old index

                stat_val = os.stat_result(

                    (stat.S_IFLNK, 0, 0, 0, 0, 0, 0, 0, 0, 0))

            blob.set_raw_string(

                self.get_symlink_target(file_id, path).encode("utf-8"))

        else:

            raise AssertionError("unknown kind '%s'" % kind)

        # Add object to the repository if it didn't exist yet

        if not blob.id in self.store:

            self.store.add_object(blob)

        # Add an entry to the index or update the existing entry

        flags = 0 # FIXME

        encoded_path = path.encode("utf-8")

        self.index[encoded_path] = index_entry_from_stat(

            stat_val, blob.id, flags)

        if self._versioned_dirs is not None:

            self._ensure_versioned_dir(encoded_path)

    def _ensure_versioned_dir(self, dirname):

        if dirname in self._versioned_dirs:

            return

        if dirname != "":

            self._ensure_versioned_dir(posixpath.dirname(dirname))

        self._versioned_dirs.add(dirname)

    def _load_dirs(self):

        assert self._lock_mode is not None

        self._versioned_dirs = set()

        for p in self.index:

            self._ensure_versioned_dir(posixpath.dirname(p))

    def _unversion_path(self, path):

        assert self._lock_mode is not None

        encoded_path = path.encode("utf-8")

        try:

            del self.index[encoded_path]

        except KeyError:

            # A directory, perhaps?

            for p in list(self.index):

                if p.startswith(encoded_path+"/"):

                    del self.index[p]

        # FIXME: remove empty directories

    @needs_tree_write_lock

    def unversion(self, file_ids):

        for file_id in file_ids:

            path = self.id2path(file_id)

            self._unversion_path(path)

        self.flush()

    def check_state(self):

        """Check that the working state is/isn't valid."""

        pass

    @needs_tree_write_lock

    def remove(self, files, verbose=False, to_file=None, keep_files=True,

        force=False):

        """Remove nominated files from the working tree metadata.

        :param files: File paths relative to the basedir.

        :param keep_files: If true, the files will also be kept.

        :param force: Delete files and directories, even if they are changed

            and even if the directories are not empty.

        """

        all_files = set() # specified and nested files 

        if isinstance(files, basestring):

            files = [files]

        if to_file is None:

            to_file = sys.stdout

        files = list(all_files)

        if len(files) == 0:

            return # nothing to do

        # Sort needed to first handle directory content before the directory

        files.sort(reverse=True)

        def backup(file_to_backup):

            abs_path = self.abspath(file_to_backup)

            backup_name = self.bzrdir._available_backup_name(file_to_backup)

            osutils.rename(abs_path, self.abspath(backup_name))

            return "removed %s (but kept a copy: %s)" % (

                file_to_backup, backup_name)

        for f in files:

            fid = self.path2id(f)

            if not fid:

                message = "%s is not versioned." % (f,)

            else:

                abs_path = self.abspath(f)

                if verbose:

                    # having removed it, it must be either ignored or unknown

                    if self.is_ignored(f):

                        new_status = 'I'

                    else:

                        new_status = '?'

                    # XXX: Really should be a more abstract reporter interface

                    kind_ch = osutils.kind_marker(self.kind(fid))

                    to_file.write(new_status + '       ' + f + kind_ch + '\n')

                # Unversion file

                # FIXME: _unversion_path() is O(size-of-index) for directories

                self._unversion_path(f)

                message = "removed %s" % (f,)

                if osutils.lexists(abs_path):

                    if (osutils.isdir(abs_path) and

                        len(os.listdir(abs_path)) > 0):

                        if force:

                            osutils.rmtree(abs_path)

                            message = "deleted %s" % (f,)

                        else:

                            message = backup(f)

                    else:

                        if not keep_files:

                            osutils.delete_any(abs_path)

                            message = "deleted %s" % (f,)

            # print only one message (if any) per file.

            if message is not None:

                trace.note(message)

        self.flush()

    def _add(self, files, ids, kinds):

        for (path, file_id, kind) in zip(files, ids, kinds):

            if file_id is not None:

                self._fileid_map.set_file_id(path.encode("utf-8"), file_id)

            else:

                file_id = self._fileid_map.lookup_file_id(path.encode("utf-8"))

            self._index_add_entry(path, file_id, kind)

    @needs_tree_write_lock

    def smart_add(self, file_list, recurse=True, action=None, save=True):

        added = []

        ignored = {}

        user_dirs = []

        for filepath in osutils.canonical_relpaths(self.basedir, file_list):

            abspath = self.abspath(filepath)

            kind = osutils.file_kind(abspath)

            if action is not None:

                file_id = action(self, None, filepath, kind)

            else:

                file_id = None

            if kind in ("file", "symlink"):

                if save:

                    self._index_add_entry(filepath, file_id, kind)

                added.append(filepath)

            elif kind == "directory":

                if recurse:

                    user_dirs.append(filepath)

            else:

                raise errors.BadFileKindError(filename=abspath, kind=kind)

        for user_dir in user_dirs:

            abs_user_dir = self.abspath(user_dir)

            for name in os.listdir(abs_user_dir):

                subp = os.path.join(user_dir, name)

                if self.is_control_filename(subp) or self.mapping.is_special_file(subp):

                    continue

                ignore_glob = self.is_ignored(subp)

                if ignore_glob is not None:

                    ignored.setdefault(ignore_glob, []).append(subp)

                    continue

                abspath = self.abspath(subp)

                kind = osutils.file_kind(abspath)

                if kind == "directory":

                    user_dirs.append(subp)

                else:

                    if action is not None:

                        file_id = action(self, None, filepath, kind)

                    else:

                        file_id = None

                    if save:

                        self._index_add_entry(subp, file_id, kind)

        if added and save:

            self.flush()

        return added, ignored

    def _set_root_id(self, file_id):

        self._fileid_map.set_file_id("", file_id)

    @needs_tree_write_lock

    def move(self, from_paths, to_dir=None, after=False):

        rename_tuples = []

        to_abs = self.abspath(to_dir)

        if not os.path.isdir(to_abs):

            raise errors.BzrMoveFailedError('', to_dir,

                errors.NotADirectory(to_abs))

        for from_rel in from_paths:

            from_tail = os.path.split(from_rel)[-1]

            to_rel = os.path.join(to_dir, from_tail)

            self.rename_one(from_rel, to_rel, after=after)

            rename_tuples.append((from_rel, to_rel))

        self.flush()

        return rename_tuples

    @needs_tree_write_lock

    def rename_one(self, from_rel, to_rel, after=False):

        from_path = from_rel.encode("utf-8")

        to_path = to_rel.encode("utf-8")

        if not self.has_filename(to_rel):

            raise errors.BzrMoveFailedError(from_rel, to_rel,

                errors.NoSuchFile(to_rel))

        if not from_path in self.index:

            raise errors.BzrMoveFailedError(from_rel, to_rel,

                errors.NotVersionedError(path=from_rel))

        if not after:

            os.rename(self.abspath(from_rel), self.abspath(to_rel))

        self.index[to_path] = self.index[from_path]

        del self.index[from_path]

        self.flush()

    def get_root_id(self):

        return self.path2id("")

    def _has_dir(self, path):

        if path == "":

            return True

        if self._versioned_dirs is None:

            self._load_dirs()

        return path in self._versioned_dirs

    @needs_read_lock

    def path2id(self, path):

        encoded_path = path.encode("utf-8")

        if self._is_versioned(encoded_path):

            return self._fileid_map.lookup_file_id(encoded_path)

        return None

    def _iter_files_recursive(self, from_dir=None):

        if from_dir is None:

            from_dir = ""

        for (dirpath, dirnames, filenames) in os.walk(self.abspath(from_dir)):

            dir_relpath = dirpath[len(self.basedir):].strip("/")

            if self.bzrdir.is_control_filename(dir_relpath):

                continue

            for filename in filenames:

                if not self.mapping.is_special_file(filename):

                    yield os.path.join(dir_relpath, filename)

    @needs_read_lock

    def extras(self):

        """Yield all unversioned files in this WorkingTree.

        """

        return set(self._iter_files_recursive()) - set(self.index)

    @needs_tree_write_lock

    def flush(self):

        # TODO: Maybe this should only write on dirty ?

        if self._lock_mode != 'w':

            raise errors.NotWriteLocked(self)

        self.index.write()

    @needs_read_lock

    def __iter__(self):

        for path in self.index:

            yield self.path2id(path)

        self._load_dirs()

        for path in self._versioned_dirs:

            yield self.path2id(path)

    def has_or_had_id(self, file_id):

        if self.has_id(file_id):

            return True

        if self.had_id(file_id):

            return True

        return False

    def had_id(self, file_id):

        path = self._basis_fileid_map.lookup_file_id(file_id)

        try:

            head = self.repository._git.head()

        except KeyError:

            # Assume no if basis is not accessible

            return False

        if head == ZERO_SHA:

            return False

        root_tree = self.store[head].tree

        try:

            tree_lookup_path(self.store.__getitem__, root_tree, path)

        except KeyError:

            return False

        else:

            return True

    def has_id(self, file_id):

        try:

            self.id2path(file_id)

        except errors.NoSuchId:

            return False

        else:

            return True

    @needs_read_lock

    def id2path(self, file_id):

        assert type(file_id) is str, "file id not a string: %r" % file_id

        file_id = osutils.safe_utf8(file_id)

        path = self._fileid_map.lookup_path(file_id)

        # FIXME: What about directories?

        if self._is_versioned(path):

            return path.decode("utf-8")

        raise errors.NoSuchId(self, file_id)

    def get_file_mtime(self, file_id, path=None):

        """See Tree.get_file_mtime."""

        if not path:

            path = self.id2path(file_id)

        return os.lstat(self.abspath(path)).st_mtime

    def get_ignore_list(self):

        ignoreset = getattr(self, '_ignoreset', None)

        if ignoreset is not None:

            return ignoreset

        ignore_globs = set()

        ignore_globs.update(ignores.get_runtime_ignores())

        ignore_globs.update(ignores.get_user_ignores())

        if self.has_filename(IGNORE_FILENAME):

            f = self.get_file_byname(IGNORE_FILENAME)

            try:

                # FIXME: Parse git file format, rather than assuming it's

                # the same as for bzr's native formats.

                ignore_globs.update(ignores.parse_ignore_file(f))

            finally:

                f.close()

        self._ignoreset = ignore_globs

        return ignore_globs

    def set_last_revision(self, revid):

        self._change_last_revision(revid)

    def _reset_data(self):

        try:

            head = self.repository._git.head()

        except KeyError, name:

            raise errors.NotBranchError("branch %s at %s" % (name,

                self.repository.base))

        if head == ZERO_SHA:

            self._basis_fileid_map = GitFileIdMap({}, self.mapping)

        else:

            self._basis_fileid_map = self.mapping.get_fileid_map(

                self.store.__getitem__, self.store[head].tree)

    @needs_read_lock

    def get_file_verifier(self, file_id, path=None, stat_value=None):

        if path is None:

            path = self.id2path(file_id)

        try:

            return ("GIT", self.index[path][-2])

        except KeyError:

            if self._has_dir(path):

                return ("GIT", None)

            raise errors.NoSuchId(self, file_id)

    @needs_read_lock

    def get_file_sha1(self, file_id, path=None, stat_value=None):

        if not path:

            path = self.id2path(file_id)

        abspath = self.abspath(path).encode(osutils._fs_enc)

        try:

            return osutils.sha_file_by_name(abspath)

        except OSError, (num, msg):

            if num in (errno.EISDIR, errno.ENOENT):

                return None

            raise

    def revision_tree(self, revid):

        return self.repository.revision_tree(revid)

    def _is_versioned(self, path):

        assert self._lock_mode is not None

        return (path in self.index or self._has_dir(path))

    def filter_unversioned_files(self, files):

        return set([p for p in files if not self._is_versioned(p.encode("utf-8"))])

    def _get_dir_ie(self, path, parent_id):

        file_id = self.path2id(path)

        return inventory.InventoryDirectory(file_id,

            posixpath.basename(path).strip("/"), parent_id)

    def _add_missing_parent_ids(self, path, dir_ids):

        if path in dir_ids:

            return []

        parent = posixpath.dirname(path).strip("/")

        ret = self._add_missing_parent_ids(parent, dir_ids)

        parent_id = dir_ids[parent]

        ie = self._get_dir_ie(path, parent_id)

        dir_ids[path] = ie.file_id

        ret.append((path, ie))

        return ret

    def _get_file_ie(self, name, path, value, parent_id):

        assert isinstance(name, unicode)

        assert isinstance(path, unicode)

        assert isinstance(value, tuple) and len(value) == 10

        (ctime, mtime, dev, ino, mode, uid, gid, size, sha, flags) = value

        file_id = self.path2id(path)

        if type(file_id) != str:

            raise AssertionError

        kind = mode_kind(mode)

        ie = inventory.entry_factory[kind](file_id, name, parent_id)

        if kind == 'symlink':

            ie.symlink_target = self.get_symlink_target(file_id)

        else:

            data = self.get_file_text(file_id, path)

            ie.text_sha1 = osutils.sha_string(data)

            ie.text_size = len(data)

            ie.executable = self.is_executable(file_id, path)

        ie.revision = None

        return ie

    def _is_executable_from_path_and_stat_from_stat(self, path, stat_result):

        mode = stat_result.st_mode

        return bool(stat.S_ISREG(mode) and stat.S_IEXEC & mode)