20
20
from __future__ import absolute_import
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# Maps format name => export function
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# Maps filename extensions => export format name
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_exporter_extensions = {}
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def register_exporter(format, extensions, func, override=False):
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"""Register an exporter.
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:param format: This is the name of the format, such as 'tgz' or 'zip'
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:param extensions: Extensions which should be used in the case that a
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format was not explicitly specified.
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:type extensions: List
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:param func: The function. It will be called with (tree, dest, root)
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:param override: Whether to override an object which already exists.
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Frequently plugins will want to provide functionality
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until it shows up in mainline, so the default is False.
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global _exporters, _exporter_extensions
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if (format not in _exporters) or override:
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_exporters[format] = func
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for ext in extensions:
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if (ext not in _exporter_extensions) or override:
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_exporter_extensions[ext] = format
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def register_lazy_exporter(scheme, extensions, module, funcname):
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"""Register lazy-loaded exporter function.
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When requesting a specific type of export, load the respective path.
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def _loader(tree, dest, root, subdir, force_mtime, fileobj):
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func = pyutils.get_named_object(module, funcname)
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return func(tree, dest, root, subdir, force_mtime=force_mtime,
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register_exporter(scheme, extensions, _loader)
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def get_stream_export_generator(tree, name=None, format=None, root=None,
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subdir=None, per_file_timestamps=False):
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"""Returns a generator that exports the given tree as a stream.
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The generator is expected to yield None while exporting the tree while the
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actual export is written to ``fileobj``.
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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. It is common practise to
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have zipfiles and tarballs extract into a subdirectory, rather than
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into the current working directory. If root is None, the default root
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will be selected as the destination without its extension.
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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 tree
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rather than now(). This will do a revision lookup for every file so
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will be significantly slower.
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if format is None and name is not None:
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format = get_format_from_filename(name)
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if format in ('dir', 'tlzma', 'txz', 'tbz2'):
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# formats that don't support streaming
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raise errors.NoSuchExportFormat(format)
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if format not in _exporters:
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raise errors.NoSuchExportFormat(format)
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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(name)
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if not per_file_timestamps:
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force_mtime = time.time()
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with tempfile.NamedTemporaryFile() as temp:
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with tree.lock_read():
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for _ in _exporters[format](
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tree, name, root, subdir,
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force_mtime=force_mtime, fileobj=temp.file):
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# FIXME(JRV): urgh, some exporters close the file for us so we need to reopen
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with open(temp.name, 'rb') as temp:
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def get_format_from_filename(name):
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global _exporter_extensions
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for ext in _exporter_extensions:
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if name.endswith(ext):
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return _exporter_extensions[ext]
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def get_export_generator(tree, dest=None, format=None, root=None, subdir=None,
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per_file_timestamps=False, fileobj=None):
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"""Returns a generator that exports the given tree.
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The generator is expected to yield None while exporting the tree while the
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actual export is written to ``fileobj``.
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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. It is common practise to
169
have zipfiles and tarballs extract into a subdirectory, rather than
170
into the current working directory. If root is None, the default root
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will be selected as the destination without its extension.
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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
175
a directory to start exporting from.
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:param per_file_timestamps: Whether to use the timestamp stored in the tree
178
rather than now(). This will do a revision lookup for every file so
179
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 = get_format_from_filename(dest)
192
# Most of the exporters will just have to call
193
# this function anyway, so why not do it for them
195
root = get_root_name(dest)
197
if format not in _exporters:
198
raise errors.NoSuchExportFormat(format)
200
if not per_file_timestamps:
201
force_mtime = time.time()
205
trace.mutter('export version %r', tree)
207
with tree.lock_read():
208
for _ in _exporters[format](
209
tree, dest, root, subdir,
210
force_mtime=force_mtime, fileobj=fileobj):
214
36
def export(tree, dest, format=None, root=None, subdir=None,
215
37
per_file_timestamps=False, fileobj=None):
234
56
for every file so will be significantly slower.
235
57
:param fileobj: Optional file object to use
237
for _ in get_export_generator(tree, dest, format, root, subdir,
238
per_file_timestamps, fileobj):
59
if format is None and dest is not None:
60
format = guess_format(dest)
62
# Most of the exporters will just have to call
63
# this function anyway, so why not do it for them
65
root = get_root_name(dest)
67
if not per_file_timestamps:
68
force_mtime = time.time()
72
trace.mutter('export version %r', tree)
75
# TODO(jelmer): If the tree is remote (e.g. HPSS, Git Remote),
76
# then we should stream a tar file and unpack that on the fly.
77
with tree.lock_read():
78
for unused in dir_exporter_generator(tree, dest, root, subdir,
83
with tree.lock_read():
84
chunks = archive.create_archive(format, tree, dest, root, subdir,
88
sys.stdout.write(chunk)
89
elif fileobj is not None:
93
with open(dest, 'wb') as f:
98
def guess_format(filename, default='dir'):
99
"""Guess the export format based on a file name.
101
:param filename: Filename to guess from
102
:param default: Default format to fall back to
105
format = archive.format_registry.get_format_from_filename(filename)
242
111
def get_root_name(dest):
293
162
yield final_path, path, entry
296
register_lazy_exporter('dir', [], 'breezy.export.dir_exporter',
297
'dir_exporter_generator')
298
register_lazy_exporter('tar', ['.tar'], 'breezy.export.tar_exporter',
299
'plain_tar_exporter_generator')
300
register_lazy_exporter('tgz', ['.tar.gz', '.tgz'],
301
'breezy.export.tar_exporter',
302
'tgz_exporter_generator')
303
register_lazy_exporter('tbz2', ['.tar.bz2', '.tbz2'],
304
'breezy.export.tar_exporter', 'tbz_exporter_generator')
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register_lazy_exporter('tlzma', ['.tar.lzma'], 'breezy.export.tar_exporter',
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'tar_lzma_exporter_generator')
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register_lazy_exporter('txz', ['.tar.xz'], 'breezy.export.tar_exporter',
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'tar_xz_exporter_generator')
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register_lazy_exporter('zip', ['.zip'], 'breezy.export.zip_exporter',
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'zip_exporter_generator')
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def dir_exporter_generator(tree, dest, root, subdir=None,
166
force_mtime=None, fileobj=None):
167
"""Return a generator that exports this tree to a new directory.
169
`dest` should either not exist or should be empty. If it does not exist it
170
will be created holding the contents of this tree.
172
:note: If the export fails, the destination directory will be
173
left in an incompletely exported state: export is not transactional.
178
if e.errno == errno.EEXIST:
179
# check if directory empty
180
if os.listdir(dest) != []:
181
raise errors.BzrError(
182
"Can't export tree to non-empty directory.")
185
# Iterate everything, building up the files we will want to export, and
186
# creating the directories and symlinks that we need.
187
# This tracks (file_id, (destination_path, executable))
188
# This matches the api that tree.iter_files_bytes() wants
189
# Note in the case of revision trees, this does trigger a double inventory
190
# lookup, hopefully it isn't too expensive.
192
for dp, tp, ie in _export_iter_entries(tree, subdir):
193
fullpath = osutils.pathjoin(dest, dp)
194
if ie.kind == "file":
195
to_fetch.append((tp, (dp, tp, ie.file_id)))
196
elif ie.kind in ("directory", "tree-reference"):
198
elif ie.kind == "symlink":
200
symlink_target = tree.get_symlink_target(tp, ie.file_id)
201
os.symlink(symlink_target, fullpath)
203
raise errors.BzrError(
204
"Failed to create symlink %r -> %r, error: %s"
205
% (fullpath, symlink_target, e))
207
raise errors.BzrError("don't know how to export {%s} of kind %r" %
211
# The data returned here can be in any order, but we've already created all
213
flags = os.O_CREAT | os.O_TRUNC | os.O_WRONLY | getattr(os, 'O_BINARY', 0)
214
for (relpath, treepath, file_id), chunks in tree.iter_files_bytes(to_fetch):
215
fullpath = osutils.pathjoin(dest, relpath)
216
# We set the mode and let the umask sort out the file info
218
if tree.is_executable(treepath, file_id):
220
with os.fdopen(os.open(fullpath, flags, mode), 'wb') as out:
221
out.writelines(chunks)
222
if force_mtime is not None:
225
mtime = tree.get_file_mtime(treepath, file_id)
226
os.utime(fullpath, (mtime, mtime))