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# Copyright (C) 2005-2011 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Export trees to tarballs, non-controlled directories, zipfiles, etc.
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from __future__ import absolute_import
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def export(tree, dest, format=None, root=None, subdir=None,
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per_file_timestamps=False, fileobj=None):
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"""Export the given Tree to the specific destination.
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:param tree: A Tree (such as RevisionTree) to export
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:param dest: The destination where the files,etc should be put
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:param format: The format (dir, zip, etc), if None, it will check the
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extension on dest, looking for a match
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:param root: The root location inside the format.
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It is common practise to have zipfiles and tarballs
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extract into a subdirectory, rather than into the
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current working directory.
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If root is None, the default root will be
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selected as the destination without its
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:param subdir: A starting directory within the tree. None means to export
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the entire tree, and anything else should specify the relative path to
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a directory to start exporting from.
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:param per_file_timestamps: Whether to use the timestamp stored in the
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tree rather than now(). This will do a revision lookup
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for every file so will be significantly slower.
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:param fileobj: Optional file object to use
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if format is None and dest is not None:
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format = guess_format(dest)
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# Most of the exporters will just have to call
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# this function anyway, so why not do it for them
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root = get_root_name(dest)
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if not per_file_timestamps:
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force_mtime = time.time()
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if getattr(tree, '_repository', None):
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force_mtime = tree._repository.get_revision(
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tree.get_revision_id()).timestamp
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except errors.NoSuchRevision:
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trace.mutter('export version %r', tree)
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# TODO(jelmer): If the tree is remote (e.g. HPSS, Git Remote),
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# then we should stream a tar file and unpack that on the fly.
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with tree.lock_read():
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for unused in dir_exporter_generator(tree, dest, root, subdir,
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with tree.lock_read():
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chunks = tree.archive(format, dest, root=root,
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subdir=subdir, force_mtime=force_mtime)
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getattr(sys.stdout, 'buffer', sys.stdout).write(chunk)
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elif fileobj is not None:
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with open(dest, 'wb') as f:
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def guess_format(filename, default='dir'):
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"""Guess the export format based on a file name.
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:param filename: Filename to guess from
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:param default: Default format to fall back to
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format = archive.format_registry.get_format_from_filename(filename)
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def get_root_name(dest):
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"""Get just the root name for an export.
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global _exporter_extensions
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# Exporting to -/foo doesn't make sense so use relative paths.
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dest = os.path.basename(dest)
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for ext in archive.format_registry.extensions:
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if dest.endswith(ext):
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return dest[:-len(ext)]
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def _export_iter_entries(tree, subdir, skip_special=True):
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"""Iter the entries for tree suitable for exporting.
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:param tree: A tree object.
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:param subdir: None or the path of an entry to start exporting from.
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:param skip_special: Whether to skip .bzr files.
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:return: iterator over tuples with final path, tree path and inventory
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entry for each entry to export
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if subdir is not None:
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subdir = subdir.rstrip('/')
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entries = tree.iter_entries_by_dir()
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for path, entry in entries:
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# The .bzr* namespace is reserved for "magic" files like
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# .bzrignore and .bzrrules - do not export these
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if skip_special and path.startswith(".bzr"):
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if entry.kind == 'directory':
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final_path = entry.name
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elif subdir is not None:
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if path.startswith(subdir + '/'):
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final_path = path[len(subdir) + 1:]
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if not tree.has_filename(path):
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yield final_path, path, entry
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def dir_exporter_generator(tree, dest, root, subdir=None,
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force_mtime=None, fileobj=None):
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"""Return a generator that exports this tree to a new directory.
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`dest` should either not exist or should be empty. If it does not exist it
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will be created holding the contents of this tree.
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:note: If the export fails, the destination directory will be
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left in an incompletely exported state: export is not transactional.
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if e.errno == errno.EEXIST:
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# check if directory empty
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if os.listdir(dest) != []:
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raise errors.BzrError(
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"Can't export tree to non-empty directory.")
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# Iterate everything, building up the files we will want to export, and
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# creating the directories and symlinks that we need.
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# This tracks (file_id, (destination_path, executable))
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# This matches the api that tree.iter_files_bytes() wants
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# Note in the case of revision trees, this does trigger a double inventory
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# lookup, hopefully it isn't too expensive.
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for dp, tp, ie in _export_iter_entries(tree, subdir):
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file_id = getattr(ie, 'file_id', None)
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fullpath = osutils.pathjoin(dest, dp)
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if ie.kind == "file":
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to_fetch.append((tp, (dp, tp, file_id)))
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elif ie.kind in ("directory", "tree-reference"):
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elif ie.kind == "symlink":
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symlink_target = tree.get_symlink_target(tp)
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os.symlink(symlink_target, fullpath)
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raise errors.BzrError(
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"Failed to create symlink %r -> %r, error: %s"
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% (fullpath, symlink_target, e))
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raise errors.BzrError("don't know how to export {%s} of kind %r" %
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# The data returned here can be in any order, but we've already created all
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flags = os.O_CREAT | os.O_TRUNC | os.O_WRONLY | getattr(os, 'O_BINARY', 0)
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for (relpath, treepath, file_id), chunks in tree.iter_files_bytes(to_fetch):
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fullpath = osutils.pathjoin(dest, relpath)
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# We set the mode and let the umask sort out the file info
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if tree.is_executable(treepath):
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with os.fdopen(os.open(fullpath, flags, mode), 'wb') as out:
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out.writelines(chunks)
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if force_mtime is not None:
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mtime = tree.get_file_mtime(treepath)
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os.utime(fullpath, (mtime, mtime))