mirror of https://github.com/python/cpython
462 lines
17 KiB
Python
462 lines
17 KiB
Python
"""distutils.util
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Miscellaneous utility functions -- anything that doesn't fit into
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one of the other *util.py modules.
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"""
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# created 1999/03/08, Greg Ward
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__revision__ = "$Id$"
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import sys, os, string, re
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from distutils.errors import DistutilsPlatformError
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from distutils.dep_util import newer
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from distutils.spawn import spawn
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def get_platform ():
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"""Return a string that identifies the current platform. This is used
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mainly to distinguish platform-specific build directories and
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platform-specific built distributions. Typically includes the OS name
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and version and the architecture (as supplied by 'os.uname()'),
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although the exact information included depends on the OS; eg. for IRIX
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the architecture isn't particularly important (IRIX only runs on SGI
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hardware), but for Linux the kernel version isn't particularly
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important.
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Examples of returned values:
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linux-i586
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linux-alpha (?)
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solaris-2.6-sun4u
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irix-5.3
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irix64-6.2
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For non-POSIX platforms, currently just returns 'sys.platform'.
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"""
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if os.name != "posix" or not hasattr(os, 'uname'):
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# XXX what about the architecture? NT is Intel or Alpha,
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# Mac OS is M68k or PPC, etc.
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return sys.platform
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# Try to distinguish various flavours of Unix
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(osname, host, release, version, machine) = os.uname()
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# Convert the OS name to lowercase and remove '/' characters
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# (to accommodate BSD/OS)
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osname = string.lower(osname)
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osname = string.replace(osname, '/', '')
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if osname[:5] == "linux":
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# At least on Linux/Intel, 'machine' is the processor --
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# i386, etc.
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# XXX what about Alpha, SPARC, etc?
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return "%s-%s" % (osname, machine)
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elif osname[:5] == "sunos":
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if release[0] >= "5": # SunOS 5 == Solaris 2
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osname = "solaris"
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release = "%d.%s" % (int(release[0]) - 3, release[2:])
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# fall through to standard osname-release-machine representation
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elif osname[:4] == "irix": # could be "irix64"!
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return "%s-%s" % (osname, release)
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elif osname[:3] == "aix":
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return "%s-%s.%s" % (osname, version, release)
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elif osname[:6] == "cygwin":
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osname = "cygwin"
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rel_re = re.compile (r'[\d.]+')
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m = rel_re.match(release)
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if m:
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release = m.group()
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return "%s-%s-%s" % (osname, release, machine)
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# get_platform ()
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def convert_path (pathname):
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"""Return 'pathname' as a name that will work on the native filesystem,
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i.e. split it on '/' and put it back together again using the current
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directory separator. Needed because filenames in the setup script are
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always supplied in Unix style, and have to be converted to the local
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convention before we can actually use them in the filesystem. Raises
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ValueError on non-Unix-ish systems if 'pathname' either starts or
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ends with a slash.
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"""
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if os.sep == '/':
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return pathname
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if pathname and pathname[0] == '/':
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raise ValueError, "path '%s' cannot be absolute" % pathname
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if pathname and pathname[-1] == '/':
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raise ValueError, "path '%s' cannot end with '/'" % pathname
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paths = string.split(pathname, '/')
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while '.' in paths:
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paths.remove('.')
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if not paths:
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return os.curdir
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return apply(os.path.join, paths)
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# convert_path ()
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def change_root (new_root, pathname):
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"""Return 'pathname' with 'new_root' prepended. If 'pathname' is
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relative, this is equivalent to "os.path.join(new_root,pathname)".
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Otherwise, it requires making 'pathname' relative and then joining the
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two, which is tricky on DOS/Windows and Mac OS.
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"""
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if os.name == 'posix':
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if not os.path.isabs(pathname):
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return os.path.join(new_root, pathname)
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else:
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return os.path.join(new_root, pathname[1:])
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elif os.name == 'nt':
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(drive, path) = os.path.splitdrive(pathname)
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if path[0] == '\\':
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path = path[1:]
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return os.path.join(new_root, path)
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elif os.name == 'os2':
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(drive, path) = os.path.splitdrive(pathname)
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if path[0] == os.sep:
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path = path[1:]
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return os.path.join(new_root, path)
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elif os.name == 'mac':
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if not os.path.isabs(pathname):
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return os.path.join(new_root, pathname)
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else:
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# Chop off volume name from start of path
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elements = string.split(pathname, ":", 1)
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pathname = ":" + elements[1]
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return os.path.join(new_root, pathname)
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else:
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raise DistutilsPlatformError, \
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"nothing known about platform '%s'" % os.name
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_environ_checked = 0
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def check_environ ():
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"""Ensure that 'os.environ' has all the environment variables we
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guarantee that users can use in config files, command-line options,
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etc. Currently this includes:
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HOME - user's home directory (Unix only)
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PLAT - description of the current platform, including hardware
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and OS (see 'get_platform()')
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"""
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global _environ_checked
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if _environ_checked:
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return
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if os.name == 'posix' and not os.environ.has_key('HOME'):
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import pwd
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os.environ['HOME'] = pwd.getpwuid(os.getuid())[5]
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if not os.environ.has_key('PLAT'):
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os.environ['PLAT'] = get_platform()
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_environ_checked = 1
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def subst_vars (s, local_vars):
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"""Perform shell/Perl-style variable substitution on 'string'. Every
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occurrence of '$' followed by a name is considered a variable, and
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variable is substituted by the value found in the 'local_vars'
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dictionary, or in 'os.environ' if it's not in 'local_vars'.
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'os.environ' is first checked/augmented to guarantee that it contains
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certain values: see 'check_environ()'. Raise ValueError for any
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variables not found in either 'local_vars' or 'os.environ'.
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"""
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check_environ()
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def _subst (match, local_vars=local_vars):
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var_name = match.group(1)
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if local_vars.has_key(var_name):
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return str(local_vars[var_name])
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else:
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return os.environ[var_name]
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try:
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return re.sub(r'\$([a-zA-Z_][a-zA-Z_0-9]*)', _subst, s)
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except KeyError, var:
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raise ValueError, "invalid variable '$%s'" % var
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# subst_vars ()
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def grok_environment_error (exc, prefix="error: "):
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"""Generate a useful error message from an EnvironmentError (IOError or
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OSError) exception object. Handles Python 1.5.1 and 1.5.2 styles, and
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does what it can to deal with exception objects that don't have a
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filename (which happens when the error is due to a two-file operation,
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such as 'rename()' or 'link()'. Returns the error message as a string
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prefixed with 'prefix'.
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"""
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# check for Python 1.5.2-style {IO,OS}Error exception objects
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if hasattr(exc, 'filename') and hasattr(exc, 'strerror'):
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if exc.filename:
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error = prefix + "%s: %s" % (exc.filename, exc.strerror)
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else:
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# two-argument functions in posix module don't
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# include the filename in the exception object!
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error = prefix + "%s" % exc.strerror
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else:
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error = prefix + str(exc[-1])
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return error
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# Needed by 'split_quoted()'
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_wordchars_re = re.compile(r'[^\\\'\"%s ]*' % string.whitespace)
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_squote_re = re.compile(r"'(?:[^'\\]|\\.)*'")
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_dquote_re = re.compile(r'"(?:[^"\\]|\\.)*"')
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def split_quoted (s):
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"""Split a string up according to Unix shell-like rules for quotes and
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backslashes. In short: words are delimited by spaces, as long as those
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spaces are not escaped by a backslash, or inside a quoted string.
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Single and double quotes are equivalent, and the quote characters can
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be backslash-escaped. The backslash is stripped from any two-character
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escape sequence, leaving only the escaped character. The quote
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characters are stripped from any quoted string. Returns a list of
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words.
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"""
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# This is a nice algorithm for splitting up a single string, since it
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# doesn't require character-by-character examination. It was a little
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# bit of a brain-bender to get it working right, though...
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s = string.strip(s)
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words = []
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pos = 0
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while s:
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m = _wordchars_re.match(s, pos)
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end = m.end()
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if end == len(s):
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words.append(s[:end])
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break
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if s[end] in string.whitespace: # unescaped, unquoted whitespace: now
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words.append(s[:end]) # we definitely have a word delimiter
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s = string.lstrip(s[end:])
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pos = 0
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elif s[end] == '\\': # preserve whatever is being escaped;
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# will become part of the current word
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s = s[:end] + s[end+1:]
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pos = end+1
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else:
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if s[end] == "'": # slurp singly-quoted string
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m = _squote_re.match(s, end)
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elif s[end] == '"': # slurp doubly-quoted string
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m = _dquote_re.match(s, end)
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else:
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raise RuntimeError, \
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"this can't happen (bad char '%c')" % s[end]
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if m is None:
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raise ValueError, \
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"bad string (mismatched %s quotes?)" % s[end]
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(beg, end) = m.span()
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s = s[:beg] + s[beg+1:end-1] + s[end:]
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pos = m.end() - 2
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if pos >= len(s):
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words.append(s)
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break
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return words
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# split_quoted ()
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def execute (func, args, msg=None, verbose=0, dry_run=0):
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"""Perform some action that affects the outside world (eg. by writing
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to the filesystem). Such actions are special because they are disabled
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by the 'dry_run' flag, and announce themselves if 'verbose' is true.
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This method takes care of all that bureaucracy for you; all you have to
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do is supply the function to call and an argument tuple for it (to
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embody the "external action" being performed), and an optional message
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to print.
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"""
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# Generate a message if we weren't passed one
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if msg is None:
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msg = "%s%s" % (func.__name__, `args`)
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if msg[-2:] == ',)': # correct for singleton tuple
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msg = msg[0:-2] + ')'
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# Print it if verbosity level is high enough
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if verbose:
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print msg
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# And do it, as long as we're not in dry-run mode
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if not dry_run:
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apply(func, args)
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# execute()
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def strtobool (val):
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"""Convert a string representation of truth to true (1) or false (0).
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True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
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are 'n', 'no', 'f', 'false', 'off', and '0'. Raises ValueError if
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'val' is anything else.
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"""
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val = string.lower(val)
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if val in ('y', 'yes', 't', 'true', 'on', '1'):
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return 1
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elif val in ('n', 'no', 'f', 'false', 'off', '0'):
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return 0
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else:
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raise ValueError, "invalid truth value %s" % `val`
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def byte_compile (py_files,
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optimize=0, force=0,
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prefix=None, base_dir=None,
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verbose=1, dry_run=0,
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direct=None):
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"""Byte-compile a collection of Python source files to either .pyc
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or .pyo files in the same directory. 'py_files' is a list of files
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to compile; any files that don't end in ".py" are silently skipped.
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'optimize' must be one of the following:
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0 - don't optimize (generate .pyc)
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1 - normal optimization (like "python -O")
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2 - extra optimization (like "python -OO")
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If 'force' is true, all files are recompiled regardless of
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timestamps.
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The source filename encoded in each bytecode file defaults to the
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filenames listed in 'py_files'; you can modify these with 'prefix' and
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'basedir'. 'prefix' is a string that will be stripped off of each
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source filename, and 'base_dir' is a directory name that will be
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prepended (after 'prefix' is stripped). You can supply either or both
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(or neither) of 'prefix' and 'base_dir', as you wish.
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If 'verbose' is true, prints out a report of each file. If 'dry_run'
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is true, doesn't actually do anything that would affect the filesystem.
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Byte-compilation is either done directly in this interpreter process
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with the standard py_compile module, or indirectly by writing a
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temporary script and executing it. Normally, you should let
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'byte_compile()' figure out to use direct compilation or not (see
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the source for details). The 'direct' flag is used by the script
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generated in indirect mode; unless you know what you're doing, leave
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it set to None.
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"""
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# First, if the caller didn't force us into direct or indirect mode,
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# figure out which mode we should be in. We take a conservative
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# approach: choose direct mode *only* if the current interpreter is
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# in debug mode and optimize is 0. If we're not in debug mode (-O
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# or -OO), we don't know which level of optimization this
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# interpreter is running with, so we can't do direct
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# byte-compilation and be certain that it's the right thing. Thus,
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# always compile indirectly if the current interpreter is in either
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# optimize mode, or if either optimization level was requested by
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# the caller.
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if direct is None:
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direct = (__debug__ and optimize == 0)
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# "Indirect" byte-compilation: write a temporary script and then
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# run it with the appropriate flags.
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if not direct:
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from tempfile import mktemp
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script_name = mktemp(".py")
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if verbose:
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print "writing byte-compilation script '%s'" % script_name
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if not dry_run:
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script = open(script_name, "w")
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script.write("""\
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from distutils.util import byte_compile
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files = [
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""")
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# XXX would be nice to write absolute filenames, just for
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# safety's sake (script should be more robust in the face of
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# chdir'ing before running it). But this requires abspath'ing
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# 'prefix' as well, and that breaks the hack in build_lib's
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# 'byte_compile()' method that carefully tacks on a trailing
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# slash (os.sep really) to make sure the prefix here is "just
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# right". This whole prefix business is rather delicate -- the
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# problem is that it's really a directory, but I'm treating it
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# as a dumb string, so trailing slashes and so forth matter.
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#py_files = map(os.path.abspath, py_files)
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#if prefix:
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# prefix = os.path.abspath(prefix)
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script.write(string.join(map(repr, py_files), ",\n") + "]\n")
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script.write("""
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byte_compile(files, optimize=%s, force=%s,
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prefix=%s, base_dir=%s,
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verbose=%s, dry_run=0,
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direct=1)
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""" % (`optimize`, `force`, `prefix`, `base_dir`, `verbose`))
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script.close()
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cmd = [sys.executable, script_name]
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if optimize == 1:
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cmd.insert(1, "-O")
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elif optimize == 2:
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cmd.insert(1, "-OO")
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spawn(cmd, verbose=verbose, dry_run=dry_run)
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execute(os.remove, (script_name,), "removing %s" % script_name,
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verbose=verbose, dry_run=dry_run)
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# "Direct" byte-compilation: use the py_compile module to compile
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# right here, right now. Note that the script generated in indirect
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# mode simply calls 'byte_compile()' in direct mode, a weird sort of
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# cross-process recursion. Hey, it works!
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else:
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from py_compile import compile
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for file in py_files:
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if file[-3:] != ".py":
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# This lets us be lazy and not filter filenames in
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# the "install_lib" command.
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continue
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# Terminology from the py_compile module:
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# cfile - byte-compiled file
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# dfile - purported source filename (same as 'file' by default)
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cfile = file + (__debug__ and "c" or "o")
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dfile = file
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if prefix:
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if file[:len(prefix)] != prefix:
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raise ValueError, \
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("invalid prefix: filename %s doesn't start with %s"
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% (`file`, `prefix`))
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dfile = dfile[len(prefix):]
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if base_dir:
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dfile = os.path.join(base_dir, dfile)
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cfile_base = os.path.basename(cfile)
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if direct:
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if force or newer(file, cfile):
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if verbose:
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print "byte-compiling %s to %s" % (file, cfile_base)
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if not dry_run:
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compile(file, cfile, dfile)
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else:
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if verbose:
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print "skipping byte-compilation of %s to %s" % \
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(file, cfile_base)
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# byte_compile ()
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def rfc822_escape (header):
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"""Return a version of the string escaped for inclusion in an
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RFC-822 header, by ensuring there are 8 spaces space after each newline.
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"""
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lines = string.split(header, '\n')
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lines = map(string.strip, lines)
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header = string.join(lines, '\n' + 8*' ')
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return header
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