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scripts.py
# -*- coding: utf-8 -*- # # Copyright (C) 2013-2015 Vinay Sajip. # Licensed to the Python Software Foundation under a contributor agreement. # See LICENSE.txt and CONTRIBUTORS.txt. # from io import BytesIO import logging import os import re import struct import sys from .compat import sysconfig, detect_encoding, ZipFile from .resources import finder from .util import (FileOperator, get_export_entry, convert_path, get_executable, in_venv) logger = logging.getLogger(__name__) _DEFAULT_MANIFEST = ''' <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"> <assemblyIdentity version="1.0.0.0" processorArchitecture="X86" name="%s" type="win32"/> <!-- Identify the application security requirements. --> <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3"> <security> <requestedPrivileges> <requestedExecutionLevel level="asInvoker" uiAccess="false"/> </requestedPrivileges> </security> </trustInfo> </assembly>'''.strip() # check if Python is called on the first line with this expression FIRST_LINE_RE = re.compile(b'^#!.*pythonw?[0-9.]*([ \t].*)?$') SCRIPT_TEMPLATE = r'''# -*- coding: utf-8 -*- import re import sys from %(module)s import %(import_name)s if __name__ == '__main__': sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0]) sys.exit(%(func)s()) ''' def _enquote_executable(executable): if ' ' in executable: # make sure we quote only the executable in case of env # for example /usr/bin/env "/dir with spaces/bin/jython" # instead of "/usr/bin/env /dir with spaces/bin/jython" # otherwise whole if executable.startswith('/usr/bin/env '): env, _executable = executable.split(' ', 1) if ' ' in _executable and not _executable.startswith('"'): executable = '%s "%s"' % (env, _executable) else: if not executable.startswith('"'): executable = '"%s"' % executable return executable class ScriptMaker(object): """ A class to copy or create scripts from source scripts or callable specifications. """ script_template = SCRIPT_TEMPLATE executable = None # for shebangs def __init__(self, source_dir, target_dir, add_launchers=True, dry_run=False, fileop=None): self.source_dir = source_dir self.target_dir = target_dir self.add_launchers = add_launchers self.force = False self.clobber = False # It only makes sense to set mode bits on POSIX. self.set_mode = (os.name == 'posix') or (os.name == 'java' and os._name == 'posix') self.variants = set(('', 'X.Y')) self._fileop = fileop or FileOperator(dry_run) self._is_nt = os.name == 'nt' or ( os.name == 'java' and os._name == 'nt') def _get_alternate_executable(self, executable, options): if options.get('gui', False) and self._is_nt: # pragma: no cover dn, fn = os.path.split(executable) fn = fn.replace('python', 'pythonw') executable = os.path.join(dn, fn) return executable if sys.platform.startswith('java'): # pragma: no cover def _is_shell(self, executable): """ Determine if the specified executable is a script (contains a #! line) """ try: with open(executable) as fp: return fp.read(2) == '#!' except (OSError, IOError): logger.warning('Failed to open %s', executable) return False def _fix_jython_executable(self, executable): if self._is_shell(executable): # Workaround for Jython is not needed on Linux systems. import java if java.lang.System.getProperty('os.name') == 'Linux': return executable elif executable.lower().endswith('jython.exe'): # Use wrapper exe for Jython on Windows return executable return '/usr/bin/env %s' % executable def _build_shebang(self, executable, post_interp): """ Build a shebang line. In the simple case (on Windows, or a shebang line which is not too long or contains spaces) use a simple formulation for the shebang. Otherwise, use /bin/sh as the executable, with a contrived shebang which allows the script to run either under Python or sh, using suitable quoting. Thanks to Harald Nordgren for his input. See also: http://www.in-ulm.de/~mascheck/various/shebang/#length https://hg.mozilla.org/mozilla-central/file/tip/mach """ if os.name != 'posix': simple_shebang = True else: # Add 3 for '#!' prefix and newline suffix. shebang_length = len(executable) + len(post_interp) + 3 if sys.platform == 'darwin': max_shebang_length = 512 else: max_shebang_length = 127 simple_shebang = ((b' ' not in executable) and (shebang_length <= max_shebang_length)) if simple_shebang: result = b'#!' + executable + post_interp + b'\n' else: result = b'#!/bin/sh\n' result += b"'''exec' " + executable + post_interp + b' "$0" "$@"\n' result += b"' '''" return result def _get_shebang(self, encoding, post_interp=b'', options=None): enquote = True if self.executable: executable = self.executable enquote = False # assume this will be taken care of elif not sysconfig.is_python_build(): executable = get_executable() elif in_venv(): # pragma: no cover executable = os.path.join(sysconfig.get_path('scripts'), 'python%s' % sysconfig.get_config_var('EXE')) else: # pragma: no cover executable = os.path.join( sysconfig.get_config_var('BINDIR'), 'python%s%s' % (sysconfig.get_config_var('VERSION'), sysconfig.get_config_var('EXE'))) if options: executable = self._get_alternate_executable(executable, options) if sys.platform.startswith('java'): # pragma: no cover executable = self._fix_jython_executable(executable) # Normalise case for Windows executable = os.path.normcase(executable) # If the user didn't specify an executable, it may be necessary to # cater for executable paths with spaces (not uncommon on Windows) if enquote: executable = _enquote_executable(executable) # Issue #51: don't use fsencode, since we later try to # check that the shebang is decodable using utf-8. executable = executable.encode('utf-8') # in case of IronPython, play safe and enable frames support if (sys.platform == 'cli' and '-X:Frames' not in post_interp and '-X:FullFrames' not in post_interp): # pragma: no cover post_interp += b' -X:Frames' shebang = self._build_shebang(executable, post_interp) # Python parser starts to read a script using UTF-8 until # it gets a #coding:xxx cookie. The shebang has to be the # first line of a file, the #coding:xxx cookie cannot be # written before. So the shebang has to be decodable from # UTF-8. try: shebang.decode('utf-8') except UnicodeDecodeError: # pragma: no cover raise ValueError( 'The shebang (%r) is not decodable from utf-8' % shebang) # If the script is encoded to a custom encoding (use a # #coding:xxx cookie), the shebang has to be decodable from # the script encoding too. if encoding != 'utf-8': try: shebang.decode(encoding) except UnicodeDecodeError: # pragma: no cover raise ValueError( 'The shebang (%r) is not decodable ' 'from the script encoding (%r)' % (shebang, encoding)) return shebang def _get_script_text(self, entry): return self.script_template % dict(module=entry.prefix, import_name=entry.suffix.split('.')[0], func=entry.suffix) manifest = _DEFAULT_MANIFEST def get_manifest(self, exename): base = os.path.basename(exename) return self.manifest % base def _write_script(self, names, shebang, script_bytes, filenames, ext): use_launcher = self.add_launchers and self._is_nt linesep = os.linesep.encode('utf-8') if not shebang.endswith(linesep): shebang += linesep if not use_launcher: script_bytes = shebang + script_bytes else: # pragma: no cover if ext == 'py': launcher = self._get_launcher('t') else: launcher = self._get_launcher('w') stream = BytesIO() with ZipFile(stream, 'w') as zf: zf.writestr('__main__.py', script_bytes) zip_data = stream.getvalue() script_bytes = launcher + shebang + zip_data for name in names: outname = os.path.join(self.target_dir, name) if use_launcher: # pragma: no cover n, e = os.path.splitext(outname) if e.startswith('.py'): outname = n outname = '%s.exe' % outname try: self._fileop.write_binary_file(outname, script_bytes) except Exception: # Failed writing an executable - it might be in use. logger.warning('Failed to write executable - trying to ' 'use .deleteme logic') dfname = '%s.deleteme' % outname if os.path.exists(dfname): os.remove(dfname) # Not allowed to fail here os.rename(outname, dfname) # nor here self._fileop.write_binary_file(outname, script_bytes) logger.debug('Able to replace executable using ' '.deleteme logic') try: os.remove(dfname) except Exception: pass # still in use - ignore error else: if self._is_nt and not outname.endswith('.' + ext): # pragma: no cover outname = '%s.%s' % (outname, ext) if os.path.exists(outname) and not self.clobber: logger.warning('Skipping existing file %s', outname) continue self._fileop.write_binary_file(outname, script_bytes) if self.set_mode: self._fileop.set_executable_mode([outname]) filenames.append(outname) def _make_script(self, entry, filenames, options=None): post_interp = b'' if options: args = options.get('interpreter_args', []) if args: args = ' %s' % ' '.join(args) post_interp = args.encode('utf-8') shebang = self._get_shebang('utf-8', post_interp, options=options) script = self._get_script_text(entry).encode('utf-8') name = entry.name scriptnames = set() if '' in self.variants: scriptnames.add(name) if 'X' in self.variants: scriptnames.add('%s%s' % (name, sys.version[0])) if 'X.Y' in self.variants: scriptnames.add('%s-%s' % (name, sys.version[:3])) if options and options.get('gui', False): ext = 'pyw' else: ext = 'py' self._write_script(scriptnames, shebang, script, filenames, ext) def _copy_script(self, script, filenames): adjust = False script = os.path.join(self.source_dir, convert_path(script)) outname = os.path.join(self.target_dir, os.path.basename(script)) if not self.force and not self._fileop.newer(script, outname): logger.debug('not copying %s (up-to-date)', script) return # Always open the file, but ignore failures in dry-run mode -- # that way, we'll get accurate feedback if we can read the # script. try: f = open(script, 'rb') except IOError: # pragma: no cover if not self.dry_run: raise f = None else: first_line = f.readline() if not first_line: # pragma: no cover logger.warning('%s: %s is an empty file (skipping)', self.get_command_name(), script) return match = FIRST_LINE_RE.match(first_line.replace(b'\r\n', b'\n')) if match: adjust = True post_interp = match.group(1) or b'' if not adjust: if f: f.close() self._fileop.copy_file(script, outname) if self.set_mode: self._fileop.set_executable_mode([outname]) filenames.append(outname) else: logger.info('copying and adjusting %s -> %s', script, self.target_dir) if not self._fileop.dry_run: encoding, lines = detect_encoding(f.readline) f.seek(0) shebang = self._get_shebang(encoding, post_interp) if b'pythonw' in first_line: # pragma: no cover ext = 'pyw' else: ext = 'py' n = os.path.basename(outname) self._write_script([n], shebang, f.read(), filenames, ext) if f: f.close() @property def dry_run(self): return self._fileop.dry_run @dry_run.setter def dry_run(self, value): self._fileop.dry_run = value if os.name == 'nt' or (os.name == 'java' and os._name == 'nt'): # pragma: no cover # Executable launcher support. # Launchers are from https://bitbucket.org/vinay.sajip/simple_launcher/ def _get_launcher(self, kind): if struct.calcsize('P') == 8: # 64-bit bits = '64' else: bits = '32' name = '%s%s.exe' % (kind, bits) # Issue 31: don't hardcode an absolute package name, but # determine it relative to the current package distlib_package = __name__.rsplit('.', 1)[0] result = finder(distlib_package).find(name).bytes return result # Public API follows def make(self, specification, options=None): """ Make a script. :param specification: The specification, which is either a valid export entry specification (to make a script from a callable) or a filename (to make a script by copying from a source location). :param options: A dictionary of options controlling script generation. :return: A list of all absolute pathnames written to. """ filenames = [] entry = get_export_entry(specification) if entry is None: self._copy_script(specification, filenames) else: self._make_script(entry, filenames, options=options) return filenames def make_multiple(self, specifications, options=None): """ Take a list of specifications and make scripts from them, :param specifications: A list of specifications. :return: A list of all absolute pathnames written to, """ filenames = [] for specification in specifications: filenames.extend(self.make(specification, options)) return filenames
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