281 lines
8.4 KiB
Python
281 lines
8.4 KiB
Python
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"""distutils.archive_util
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Utility functions for creating archive files (tarballs, zip files,
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that sort of thing)."""
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import os
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from warnings import warn
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import sys
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try:
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import zipfile
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except ImportError:
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zipfile = None
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from distutils.errors import DistutilsExecError
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from distutils.spawn import spawn
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from distutils.dir_util import mkpath
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from distutils import log
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try:
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from pwd import getpwnam
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except ImportError:
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getpwnam = None
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try:
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from grp import getgrnam
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except ImportError:
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getgrnam = None
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def _get_gid(name):
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"""Returns a gid, given a group name."""
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if getgrnam is None or name is None:
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return None
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try:
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result = getgrnam(name)
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except KeyError:
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result = None
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if result is not None:
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return result[2]
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return None
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def _get_uid(name):
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"""Returns an uid, given a user name."""
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if getpwnam is None or name is None:
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return None
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try:
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result = getpwnam(name)
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except KeyError:
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result = None
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if result is not None:
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return result[2]
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return None
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def make_tarball(
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base_name, base_dir, compress="gzip", verbose=0, dry_run=0, owner=None, group=None
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):
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"""Create a (possibly compressed) tar file from all the files under
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'base_dir'.
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'compress' must be "gzip" (the default), "bzip2", "xz", "compress", or
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None. ("compress" will be deprecated in Python 3.2)
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'owner' and 'group' can be used to define an owner and a group for the
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archive that is being built. If not provided, the current owner and group
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will be used.
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The output tar file will be named 'base_dir' + ".tar", possibly plus
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the appropriate compression extension (".gz", ".bz2", ".xz" or ".Z").
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Returns the output filename.
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"""
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tar_compression = {
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'gzip': 'gz',
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'bzip2': 'bz2',
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'xz': 'xz',
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None: '',
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'compress': '',
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}
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compress_ext = {'gzip': '.gz', 'bzip2': '.bz2', 'xz': '.xz', 'compress': '.Z'}
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# flags for compression program, each element of list will be an argument
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if compress is not None and compress not in compress_ext.keys():
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raise ValueError(
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"bad value for 'compress': must be None, 'gzip', 'bzip2', "
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"'xz' or 'compress'"
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)
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archive_name = base_name + '.tar'
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if compress != 'compress':
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archive_name += compress_ext.get(compress, '')
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mkpath(os.path.dirname(archive_name), dry_run=dry_run)
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# creating the tarball
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import tarfile # late import so Python build itself doesn't break
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log.info('Creating tar archive')
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uid = _get_uid(owner)
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gid = _get_gid(group)
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def _set_uid_gid(tarinfo):
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if gid is not None:
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tarinfo.gid = gid
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tarinfo.gname = group
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if uid is not None:
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tarinfo.uid = uid
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tarinfo.uname = owner
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return tarinfo
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if not dry_run:
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tar = tarfile.open(archive_name, 'w|%s' % tar_compression[compress])
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try:
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tar.add(base_dir, filter=_set_uid_gid)
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finally:
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tar.close()
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# compression using `compress`
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if compress == 'compress':
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warn("'compress' will be deprecated.", PendingDeprecationWarning)
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# the option varies depending on the platform
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compressed_name = archive_name + compress_ext[compress]
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if sys.platform == 'win32':
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cmd = [compress, archive_name, compressed_name]
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else:
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cmd = [compress, '-f', archive_name]
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spawn(cmd, dry_run=dry_run)
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return compressed_name
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return archive_name
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def make_zipfile(base_name, base_dir, verbose=0, dry_run=0):
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"""Create a zip file from all the files under 'base_dir'.
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The output zip file will be named 'base_name' + ".zip". Uses either the
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"zipfile" Python module (if available) or the InfoZIP "zip" utility
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(if installed and found on the default search path). If neither tool is
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available, raises DistutilsExecError. Returns the name of the output zip
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file.
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"""
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zip_filename = base_name + ".zip"
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mkpath(os.path.dirname(zip_filename), dry_run=dry_run)
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# If zipfile module is not available, try spawning an external
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# 'zip' command.
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if zipfile is None:
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if verbose:
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zipoptions = "-r"
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else:
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zipoptions = "-rq"
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try:
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spawn(["zip", zipoptions, zip_filename, base_dir], dry_run=dry_run)
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except DistutilsExecError:
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# XXX really should distinguish between "couldn't find
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# external 'zip' command" and "zip failed".
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raise DistutilsExecError(
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(
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"unable to create zip file '%s': "
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"could neither import the 'zipfile' module nor "
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"find a standalone zip utility"
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)
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% zip_filename
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)
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else:
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log.info("creating '%s' and adding '%s' to it", zip_filename, base_dir)
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if not dry_run:
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try:
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zip = zipfile.ZipFile(
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zip_filename, "w", compression=zipfile.ZIP_DEFLATED
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)
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except RuntimeError:
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zip = zipfile.ZipFile(zip_filename, "w", compression=zipfile.ZIP_STORED)
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with zip:
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if base_dir != os.curdir:
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path = os.path.normpath(os.path.join(base_dir, ''))
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zip.write(path, path)
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log.info("adding '%s'", path)
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for dirpath, dirnames, filenames in os.walk(base_dir):
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for name in dirnames:
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path = os.path.normpath(os.path.join(dirpath, name, ''))
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zip.write(path, path)
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log.info("adding '%s'", path)
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for name in filenames:
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path = os.path.normpath(os.path.join(dirpath, name))
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if os.path.isfile(path):
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zip.write(path, path)
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log.info("adding '%s'", path)
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return zip_filename
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ARCHIVE_FORMATS = {
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'gztar': (make_tarball, [('compress', 'gzip')], "gzip'ed tar-file"),
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'bztar': (make_tarball, [('compress', 'bzip2')], "bzip2'ed tar-file"),
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'xztar': (make_tarball, [('compress', 'xz')], "xz'ed tar-file"),
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'ztar': (make_tarball, [('compress', 'compress')], "compressed tar file"),
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'tar': (make_tarball, [('compress', None)], "uncompressed tar file"),
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'zip': (make_zipfile, [], "ZIP file"),
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}
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def check_archive_formats(formats):
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"""Returns the first format from the 'format' list that is unknown.
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If all formats are known, returns None
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"""
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for format in formats:
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if format not in ARCHIVE_FORMATS:
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return format
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return None
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def make_archive(
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base_name,
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format,
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root_dir=None,
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base_dir=None,
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verbose=0,
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dry_run=0,
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owner=None,
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group=None,
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):
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"""Create an archive file (eg. zip or tar).
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'base_name' is the name of the file to create, minus any format-specific
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extension; 'format' is the archive format: one of "zip", "tar", "gztar",
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"bztar", "xztar", or "ztar".
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'root_dir' is a directory that will be the root directory of the
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archive; ie. we typically chdir into 'root_dir' before creating the
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archive. 'base_dir' is the directory where we start archiving from;
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ie. 'base_dir' will be the common prefix of all files and
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directories in the archive. 'root_dir' and 'base_dir' both default
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to the current directory. Returns the name of the archive file.
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'owner' and 'group' are used when creating a tar archive. By default,
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uses the current owner and group.
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"""
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save_cwd = os.getcwd()
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if root_dir is not None:
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log.debug("changing into '%s'", root_dir)
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base_name = os.path.abspath(base_name)
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if not dry_run:
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os.chdir(root_dir)
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if base_dir is None:
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base_dir = os.curdir
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kwargs = {'dry_run': dry_run}
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try:
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format_info = ARCHIVE_FORMATS[format]
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except KeyError:
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raise ValueError("unknown archive format '%s'" % format)
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func = format_info[0]
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for arg, val in format_info[1]:
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kwargs[arg] = val
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if format != 'zip':
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kwargs['owner'] = owner
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kwargs['group'] = group
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try:
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filename = func(base_name, base_dir, **kwargs)
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finally:
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if root_dir is not None:
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log.debug("changing back to '%s'", save_cwd)
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os.chdir(save_cwd)
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return filename
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