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"""distutils.command.build_scripts Implements the Distutils 'build_scripts' command.""" import os, re from stat import ST_MODE from distutils import sysconfig from distutils.core import Command from distutils.dep_util import newer from distutils.util import convert_path, Mixin2to3 from distutils import log import tokenize # check if Python is called on the first line with this expression first_line_re = re.compile(b'^#!.*python[0-9.]*([ \t].*)?$') class build_scripts(Command): description = "\"build\" scripts (copy and fixup #! line)" user_options = [ ('build-dir=', 'd', "directory to \"build\" (copy) to"), ('force', 'f', "forcibly build everything (ignore file timestamps"), ('executable=', 'e', "specify final destination interpreter path"), ] boolean_options = ['force'] def initialize_options(self): self.build_dir = None self.scripts = None self.force = None self.executable = None self.outfiles = None def finalize_options(self): self.set_undefined_options('build', ('build_scripts', 'build_dir'), ('force', 'force'), ('executable', 'executable')) self.scripts = self.distribution.scripts def get_source_files(self): return self.scripts def run(self): if not self.scripts: return self.copy_scripts() def copy_scripts(self): r"""Copy each script listed in 'self.scripts'; if it's marked as a Python script in the Unix way (first line matches 'first_line_re', ie. starts with "\#!" and contains "python"), then adjust the first line to refer to the current Python interpreter as we copy. """ self.mkpath(self.build_dir) outfiles = [] updated_files = [] for script in self.scripts: adjust = False script = convert_path(script) outfile = os.path.join(self.build_dir, os.path.basename(script)) outfiles.append(outfile) if not self.force and not newer(script, outfile): log.debug("not copying %s (up-to-date)", script) continue # 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 OSError: if not self.dry_run: raise f = None else: encoding, lines = tokenize.detect_encoding(f.readline) f.seek(0) first_line = f.readline() if not first_line: self.warn("%s is an empty file (skipping)" % script) continue match = first_line_re.match(first_line) if match: adjust = True post_interp = match.group(1) or b'' if adjust: log.info("copying and adjusting %s -> %s", script, self.build_dir) updated_files.append(outfile) if not self.dry_run: if not sysconfig.python_build: executable = self.executable else: executable = os.path.join( sysconfig.get_config_var("BINDIR"), "python%s%s" % (sysconfig.get_config_var("VERSION"), sysconfig.get_config_var("EXE"))) executable = os.fsencode(executable) shebang = b"#!" + executable + post_interp + b"\n" # 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: raise ValueError( "The shebang ({!r}) is not decodable " "from utf-8".format(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. try: shebang.decode(encoding) except UnicodeDecodeError: raise ValueError( "The shebang ({!r}) is not decodable " "from the script encoding ({})" .format(shebang, encoding)) with open(outfile, "wb") as outf: outf.write(shebang) outf.writelines(f.readlines()) if f: f.close() else: if f: f.close() updated_files.append(outfile) self.copy_file(script, outfile) if os.name == 'posix': for file in outfiles: if self.dry_run: log.info("changing mode of %s", file) else: oldmode = os.stat(file)[ST_MODE] & 0o7777 newmode = (oldmode | 0o555) & 0o7777 if newmode != oldmode: log.info("changing mode of %s from %o to %o", file, oldmode, newmode) os.chmod(file, newmode) # XXX should we modify self.outfiles? return outfiles, updated_files class build_scripts_2to3(build_scripts, Mixin2to3): def copy_scripts(self): outfiles, updated_files = build_scripts.copy_scripts(self) if not self.dry_run: self.run_2to3(updated_files) return outfiles, updated_files
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