Scripts to download files from google storage based on sha1 sums

third_party/gsutil/gslib/commands/setmeta.py

+# Copyright 2012 Google Inc.
+#coding=utf8
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import boto
+import csv
+import StringIO
+
+from boto.s3.key import Key
+from gslib.command import COMMAND_NAME
+from gslib.command import COMMAND_NAME_ALIASES
+from gslib.command import CONFIG_REQUIRED
+from gslib.command import Command
+from gslib.command import FILE_URIS_OK
+from gslib.command import MAX_ARGS
+from gslib.command import MIN_ARGS
+from gslib.command import PROVIDER_URIS_OK
+from gslib.command import SUPPORTED_SUB_ARGS
+from gslib.command import URIS_START_ARG
+from gslib.exception import CommandException
+from gslib.help_provider import HELP_NAME
+from gslib.help_provider import HELP_NAME_ALIASES
+from gslib.help_provider import HELP_ONE_LINE_SUMMARY
+from gslib.help_provider import HELP_TEXT
+from gslib.help_provider import HELP_TYPE
+from gslib.help_provider import HelpType
+from gslib.name_expansion import NameExpansionIterator
+from gslib.util import NO_MAX
+
+_detailed_help_text = ("""
+<B>SYNOPSIS</B>
+    gsutil setmeta [-n] -h [header:value|header] ... uri...
+
+
+<B>DESCRIPTION</B>
+  The gsutil setmeta command allows you to set or remove the metadata on one
+  or more objects. It takes one or more header arguments followed by one or
+  more URIs, where each header argument is in one of two forms:
+
+    - if you specify header:value, it will set the given header on all
+      named objects.
+
+    - if you specify header (with no value), it will remove the given header
+      from all named objects.
+
+  For example, the following command would set the Content-Type and
+  Cache-Control and remove the Content-Disposition on the specified objects:
+
+    gsutil setmeta -h "Content-Type:text/html" -h "Cache-Control:public, max-age=3600" -h "Content-Disposition" gs://bucket/*.html
+
+  If you have a large number of objects to update you might want to use the
+  gsutil -m option, to perform a parallel (multi-threaded/multi-processing)
+  update:
+
+    gsutil -m setmeta -h "Content-Type:text/html" -h "Cache-Control:public, max-age=3600" -h "Content-Disposition" gs://bucket/*.html
+
+  See "gsutil help metadata" for details about how you can set metadata
+  while uploading objects, what metadata fields can be set and the meaning of
+  these fields, use of custom metadata, and how to view currently set metadata.
+
+
+<B>OPERATION COST</B>
+  This command uses four operations per URI (one to read the ACL, one to read
+  the current metadata, one to set the new metadata, and one to set the ACL).
+
+  For cases where you want all objects to have the same ACL you can avoid half
+  these operations by setting a default ACL on the bucket(s) containing the
+  named objects, and using the setmeta -n option. See "help gsutil setdefacl".
+
+
+<B>OPTIONS</B>
+  -h          Specifies a header:value to be added, or header to be removed,
+              from each named object.
+  -n          Causes the operations for reading and writing the ACL to be
+              skipped. This halves the number of operations performed per
+              request, improving the speed and reducing the cost of performing
+              the operations. This option makes sense for cases where you want
+              all objects to have the same ACL, for which you have set a default
+              ACL on the bucket(s) containing the objects. See "help gsutil
+              setdefacl".
+
+
+<B>OLDER SYNTAX (DEPRECATED)</B>
+  The first version of the setmeta command used more complicated syntax
+  (described below). gsutil still supports this syntax, to avoid breaking
+  existing customer uses, but it is now deprecated and will eventually
+  be removed.
+
+  With this older syntax, the setmeta command accepts a single metadata
+  argument in one of two forms:
+
+    gsutil setmeta [-n] header:value uri...
+
+  or
+
+    gsutil setmeta [-n] '"header:value","-header",...' uri...
+
+  The first form allows you to specify a single header name and value to
+  set. For example, the following command would set the Content-Type and
+  Cache-Control and remove the Content-Disposition on the specified objects:
+
+    gsutil setmeta -h "Content-Type:text/html" -h "Cache-Control:public, max-age=3600" -h "Content-Disposition" gs://bucket/*.html
+
+  This form only works if the header name and value don't contain double
+  quotes or commas, and only works for setting the header value (not for
+  removing it).
+
+  The more general form of the first argument allows both setting and removing
+  multiple fields, without any of the content restrictions noted above. For
+  this variant the first argument is a CSV-formatted list of headers to add
+  or remove. Getting the CSV-formatted list to be passed correctly into gsutil
+  requires different syntax on Linux or MacOS than it does on Windows.
+
+  On Linux or MacOS you need to surround the entire argument in single quotes
+  to avoid having the shell interpret/strip out the double-quotes in the CSV
+  data. For example, the following command would set the Content-Type and
+  Cache-Control and remove the Content-Disposition on the specified objects:
+
+    gsutil setmeta '"Content-Type:text/html","Cache-Control:public, max-age=3600","-Content-Disposition"' gs://bucket/*.html
+
+  To pass CSV data on Windows you need two sets of double quotes around
+  each header/value pair, and one set of double quotes around the entire
+  expression. For example, the following command would set the Content-Type
+  and Cache-Control and remove the Content-Disposition on the specified objects:
+
+    gsutil setmeta "\""Content-Type:text/html"",""Cache-Control:public, max-age=3600"",""-Content-Disposition""\" gs://bucket/*.html
+
+
+<B>WARNING ABOUT USING SETMETA WITH VERSIONING ENABLED</B>
+
+Note that if you use the gsutil setmeta command on an object in a bucket
+with versioning enabled (see 'gsutil help versioning'), it will create
+a new object version (and thus, you will get charged for the space required
+for holding the additional version.
+""")
+
+
+class SetMetaCommand(Command):
+  """Implementation of gsutil setmeta command."""
+
+  # Command specification (processed by parent class).
+  command_spec = {
+    # Name of command.
+    COMMAND_NAME : 'setmeta',
+    # List of command name aliases.
+    COMMAND_NAME_ALIASES : ['setheader'],
+    # Min number of args required by this command.
+    MIN_ARGS : 1,
+    # Max number of args required by this command, or NO_MAX.
+    MAX_ARGS : NO_MAX,
+    # Getopt-style string specifying acceptable sub args.
+    SUPPORTED_SUB_ARGS : 'h:n',
+    # True if file URIs acceptable for this command.
+    FILE_URIS_OK : False,
+    # True if provider-only URIs acceptable for this command.
+    PROVIDER_URIS_OK : False,
+    # Index in args of first URI arg.
+    URIS_START_ARG : 1,
+    # True if must configure gsutil before running command.
+    CONFIG_REQUIRED : True,
+  }
+  help_spec = {
+    # Name of command or auxiliary help info for which this help applies.
+    HELP_NAME : 'setmeta',
+    # List of help name aliases.
+    HELP_NAME_ALIASES : ['setheader'],
+    # Type of help:
+    HELP_TYPE : HelpType.COMMAND_HELP,
+    # One line summary of this help.
+    HELP_ONE_LINE_SUMMARY : 'Set metadata on already uploaded objects',
+    # The full help text.
+    HELP_TEXT : _detailed_help_text,
+  }
+
+  # Command entry point.
+  def RunCommand(self):
+    headers = []
+    preserve_acl = True
+    if self.sub_opts:
+      for o, a in self.sub_opts:
+        if o == '-n':
+          preserve_acl = False
+        elif o == '-h':
+          headers.append(a)
+
+    if headers:
+      (metadata_minus, metadata_plus) = self._ParseMetadataHeaders(headers)
+      uri_args = self.args
+    else:
+      (metadata_minus, metadata_plus) = self._ParseMetadataSpec(self.args[0])
+      uri_args = self.args[1:]
+
+    if (len(uri_args) == 1
+        and not self.suri_builder.StorageUri(uri_args[0]).names_object()):
+      raise CommandException('URI (%s) must name an object' % uri_args[0])
+
+    # Used to track if any objects' metadata failed to be set.
+    self.everything_set_okay = True
+
+    def _SetMetadataExceptionHandler(e):
+      """Simple exception handler to allow post-completion status."""
+      self.THREADED_LOGGER.error(str(e))
+      self.everything_set_okay = False
+
+    def _SetMetadataFunc(name_expansion_result):
+      exp_src_uri = self.suri_builder.StorageUri(
+          name_expansion_result.GetExpandedUriStr())
+      self.THREADED_LOGGER.info('Setting metadata on %s...' % exp_src_uri)
+      exp_src_uri.set_metadata(metadata_plus, metadata_minus, preserve_acl)
+
+    name_expansion_iterator = NameExpansionIterator(
+        self.command_name, self.proj_id_handler, self.headers, self.debug,
+        self.bucket_storage_uri_class, uri_args, self.recursion_requested,
+        self.recursion_requested)
+
+    # Perform requests in parallel (-m) mode, if requested, using
+    # configured number of parallel processes and threads. Otherwise,
+    # perform requests with sequential function calls in current process.
+    self.Apply(_SetMetadataFunc, name_expansion_iterator,
+               _SetMetadataExceptionHandler)
+
+    if not self.everything_set_okay:
+      raise CommandException('Metadata for some objects could not be set.')
+
+    return 0
+
+  def _ParseMetadataHeaders(self, headers):
+    metadata_minus = set()
+    cust_metadata_minus = set()
+    metadata_plus = {}
+    cust_metadata_plus = {}
+    # Build a count of the keys encountered from each plus and minus arg so we
+    # can check for dupe field specs.
+    num_metadata_plus_elems = 0
+    num_cust_metadata_plus_elems = 0
+    num_metadata_minus_elems = 0
+    num_cust_metadata_minus_elems = 0
+
+    for md_arg in headers:
+      parts = md_arg.split(':')
+      if len(parts) not in (1, 2):
+        raise CommandException(
+            'Invalid argument: must be either header or header:value (%s)' %
+            md_arg)
+      if len(parts) == 2:
+        (header, value) = parts
+      else:
+        (header, value) = (parts[0], None)
+      _InsistAsciiHeader(header)
+      # Translate headers to lowercase to match the casing assumed by our
+      # sanity-checking operations.
+      header = header.lower()
+      if value:
+        if _IsCustomMeta(header):
+          # Allow non-ASCII data for custom metadata fields. Don't unicode
+          # encode other fields because that would perturb their content
+          # (e.g., adding %2F's into the middle of a Cache-Control value).
+          value = unicode(value, 'utf-8')
+          cust_metadata_plus[header] = value
+          num_cust_metadata_plus_elems += 1
+        else:
+          metadata_plus[header] = value
+          num_metadata_plus_elems += 1
+      else:
+        if _IsCustomMeta(header):
+          cust_metadata_minus.add(header)
+          num_cust_metadata_minus_elems += 1
+        else:
+          metadata_minus.add(header)
+          num_metadata_minus_elems += 1
+    if (num_metadata_plus_elems != len(metadata_plus)
+        or num_cust_metadata_plus_elems != len(cust_metadata_plus)
+        or num_metadata_minus_elems != len(metadata_minus)
+        or num_cust_metadata_minus_elems != len(cust_metadata_minus)
+        or metadata_minus.intersection(set(metadata_plus.keys()))):
+      raise CommandException('Each header must appear at most once.')
+    other_than_base_fields = (set(metadata_plus.keys())
+        .difference(Key.base_user_settable_fields))
+    other_than_base_fields.update(
+        metadata_minus.difference(Key.base_user_settable_fields))
+    for f in other_than_base_fields:
+      # This check is overly simple; it would be stronger to check, for each
+      # URI argument, whether f.startswith the
+      # uri.get_provider().metadata_prefix, but here we just parse the spec
+      # once, before processing any of the URIs. This means we will not
+      # detect if the user tries to set an x-goog-meta- field on an another
+      # provider's object, for example.
+      if not _IsCustomMeta(f):
+        raise CommandException('Invalid or disallowed header (%s).\n'
+                               'Only these fields (plus x-goog-meta-* fields)'
+                               ' can be set or unset:\n%s' % (f,
+                               sorted(list(Key.base_user_settable_fields))))
+    metadata_plus.update(cust_metadata_plus)
+    metadata_minus.update(cust_metadata_minus)
+    return (metadata_minus, metadata_plus)
+
+  def _ParseMetadataSpec(self, spec):
+    self.THREADED_LOGGER.info('WARNING: metadata spec syntax (%s)\nis '
+                              'deprecated and will eventually be removed.\n'
+                              'Please see "gsutil help setmeta" for current '
+                              'syntax' % spec)
+    metadata_minus = set()
+    cust_metadata_minus = set()
+    metadata_plus = {}
+    cust_metadata_plus = {}
+    # Build a count of the keys encountered from each plus and minus arg so we
+    # can check for dupe field specs.
+    num_metadata_plus_elems = 0
+    num_cust_metadata_plus_elems = 0
+    num_metadata_minus_elems = 0
+    num_cust_metadata_minus_elems = 0
+
+    mdf = StringIO.StringIO(spec)
+    for md_arg in csv.reader(mdf).next():
+      if not md_arg:
+        raise CommandException(
+            'Invalid empty metadata specification component.')
+      if md_arg[0] == '-':
+        header = md_arg[1:]
+        if header.find(':') != -1:
+          raise CommandException('Removal spec may not contain ":" (%s).' %
+                                 header)
+        _InsistAsciiHeader(header)
+        # Translate headers to lowercase to match the casing required by
+        # uri.set_metadata().
+        header = header.lower()
+        if _IsCustomMeta(header):
+          cust_metadata_minus.add(header)
+          num_cust_metadata_minus_elems += 1
+        else:
+          metadata_minus.add(header)
+          num_metadata_minus_elems += 1
+      else:
+        parts = md_arg.split(':', 1)
+        if len(parts) != 2:
+          raise CommandException(
+              'Fields being added must include values (%s).' % md_arg)
+        (header, value) = parts
+        _InsistAsciiHeader(header)
+        header = header.lower()
+        if _IsCustomMeta(header):
+          # Allow non-ASCII data for custom metadata fields. Don't unicode
+          # encode other fields because that would perturb their content
+          # (e.g., adding %2F's into the middle of a Cache-Control value).
+          value = unicode(value, 'utf-8')
+          cust_metadata_plus[header] = value
+          num_cust_metadata_plus_elems += 1
+        else:
+          metadata_plus[header] = value
+          num_metadata_plus_elems += 1
+    mdf.close()
+    if (num_metadata_plus_elems != len(metadata_plus)
+        or num_cust_metadata_plus_elems != len(cust_metadata_plus)
+        or num_metadata_minus_elems != len(metadata_minus)
+        or num_cust_metadata_minus_elems != len(cust_metadata_minus)
+        or metadata_minus.intersection(set(metadata_plus.keys()))):
+      raise CommandException('Each header must appear at most once.')
+    other_than_base_fields = (set(metadata_plus.keys())
+        .difference(Key.base_user_settable_fields))
+    other_than_base_fields.update(
+        metadata_minus.difference(Key.base_user_settable_fields))
+    for f in other_than_base_fields:
+      # This check is overly simple; it would be stronger to check, for each
+      # URI argument, whether f.startswith the
+      # uri.get_provider().metadata_prefix, but here we just parse the spec
+      # once, before processing any of the URIs. This means we will not
+      # detect if the user tries to set an x-goog-meta- field on an another
+      # provider's object, for example.
+      if not _IsCustomMeta(f):
+        raise CommandException('Invalid or disallowed header (%s).\n'
+                               'Only these fields (plus x-goog-meta-* fields)'
+                               ' can be set or unset:\n%s' % (f,
+                               sorted(list(Key.base_user_settable_fields))))
+    metadata_plus.update(cust_metadata_plus)
+    metadata_minus.update(cust_metadata_minus)
+    return (metadata_minus, metadata_plus)
+
+  # Test specification. See definition of test_steps in base class for
+  # details on how to populate these fields.
+  test_steps = [
+    # (test name, cmd line, ret code, (result_file, expect_file))
+    ('upload', 'gsutil -h "x-goog-meta-xyz:abc" '
+     '-h "Content-Type:image/gif" cp $F1 gs://$B1/$O1', 0, None),
+    ('setup gif CT', 'echo image/gif >test_gif.ct', 0, None),
+    ('setup html CT', 'echo text/html >test_html.ct', 0, None),
+    ('setup META', 'echo "abc" >test.meta', 0, None),
+    ('retrieve initial metadata', 'gsutil ls -L gs://$B1/$O1 >$F1', 0, None),
+    ('verify initial Content-Type', 'grep Content-Type $F1 | cut -f3 >$F2',
+      0, ('$F2', 'test_gif.ct')),
+    ('verify initial x-goog-meta-xyz',
+     'grep x-goog-meta-xyz $F1 | cut -f3 > $F2', 0, ('$F2', 'test.meta')),
+    ('run setmeta',
+     'gsutil setmeta -n -h Content-Type:text/html -h x-goog-meta-xyz '
+     'gs://$B1/$O1', 0, None),
+    ('retrieve new metadata', 'gsutil ls -L gs://$B1/$O1 >$F1', 0, None),
+    ('verify new Content-Type', 'grep Content-Type $F1 | cut -f3 >$F2',
+      0, ('$F2', 'test_html.ct')),
+    ('verify new x-goog-meta-xyz', 'grep -q xyz $F1', 1, None),
+    # Test handling of various illegal setmeta commands.
+    ('test missing header value',
+     'gsutil setmeta \'"Content-Type"\' gs://$B1/$O1', 1, None),
+    ('test value included with minus header',
+     'gsutil setmeta \'"-Content-Type:text/html"\' gs://$B1/$O1', 1, None),
+    ('test header included as both plus and minus header',
+     'gsutil setmeta \'"Content-Type:text/html","-Content-Type"\' gs://$B1/$O1',
+     1, None),
+    ('test non-ASCII custom header',
+     'gsutil setmeta \'"x-goog-meta-soufflé:5"\' gs://$B1/$O1', 1, None),
+    ('test disallowed header',
+     'gsutil setmeta \'"Content-Length:5"\' gs://$B1/$O1', 1, None),
+     #
+     # Older (deprecated) syntax tests:
+    ('upload', 'gsutil -h "x-goog-meta-xyz:abc" '
+     '-h "Content-Type:image/gif" cp $F1 gs://$B1/$O1', 0, None),
+    ('setup gif CT', 'echo image/gif >test_gif.ct', 0, None),
+    ('setup html CT', 'echo text/html >test_html.ct', 0, None),
+    ('setup META', 'echo "abc" >test.meta', 0, None),
+    ('retrieve initial metadata', 'gsutil ls -L gs://$B1/$O1 >$F1', 0, None),
+    ('verify initial Content-Type', 'grep Content-Type $F1 | cut -f3 >$F2',
+      0, ('$F2', 'test_gif.ct')),
+    ('verify initial x-goog-meta-xyz',
+     'grep x-goog-meta-xyz $F1 | cut -f3 > $F2', 0, ('$F2', 'test.meta')),
+    ('run setmeta (deprecated syntax)',
+     'gsutil setmeta -n \'"Content-Type:text/html","-x-goog-meta-xyz"\' '
+     'gs://$B1/$O1', 0, None),
+    ('retrieve new metadata', 'gsutil ls -L gs://$B1/$O1 >$F1', 0, None),
+    ('verify new Content-Type', 'grep Content-Type $F1 | cut -f3 >$F2',
+      0, ('$F2', 'test_html.ct')),
+    ('verify new x-goog-meta-xyz', 'grep -q xyz $F1', 1, None),
+    # Test handling of various illegal setmeta commands.
+    ('test missing header value',
+     'gsutil setmeta \'"Content-Type"\' gs://$B1/$O1', 1, None),
+    ('test value included with minus header',
+     'gsutil setmeta \'"-Content-Type:text/html"\' gs://$B1/$O1', 1, None),
+    ('test header included as both plus and minus header',
+     'gsutil setmeta \'"Content-Type:text/html","-Content-Type"\' gs://$B1/$O1',
+     1, None),
+    ('test non-ASCII custom header',
+     'gsutil setmeta \'"x-goog-meta-soufflé:5"\' gs://$B1/$O1', 1, None),
+    ('test disallowed header',
+     'gsutil setmeta \'"Content-Length:5"\' gs://$B1/$O1', 1, None),
+     #
+    ('remove test files', 'rm -f test_gif.ct test_html.ct test.meta', 0, None),
+  ]
+
+
+def _InsistAsciiHeader(header):
+  if not all(ord(c) < 128 for c in header):
+    raise CommandException('Invalid non-ASCII header (%s).' % header)
+
+def _IsCustomMeta(header):
+  return header.startswith('x-goog-meta-') or header.startswith('x-amz-meta-')