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