mirror of
https://github.com/Lucas-V-L/lucasvl.nl.git
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174 lines
5.5 KiB
Python
174 lines
5.5 KiB
Python
"""distutils.command.build_scripts
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Implements the Distutils 'build_scripts' command."""
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import os
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import re
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from stat import ST_MODE
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from distutils import sysconfig
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from distutils.core import Command
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from distutils.dep_util import newer
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from distutils.util import convert_path
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from distutils import log
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import tokenize
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shebang_pattern = re.compile('^#!.*python[0-9.]*([ \t].*)?$')
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"""
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Pattern matching a Python interpreter indicated in first line of a script.
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"""
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# for Setuptools compatibility
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first_line_re = shebang_pattern
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class build_scripts(Command):
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description = "\"build\" scripts (copy and fixup #! line)"
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user_options = [
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('build-dir=', 'd', "directory to \"build\" (copy) to"),
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('force', 'f', "forcibly build everything (ignore file timestamps"),
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('executable=', 'e', "specify final destination interpreter path"),
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]
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boolean_options = ['force']
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def initialize_options(self):
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self.build_dir = None
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self.scripts = None
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self.force = None
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self.executable = None
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def finalize_options(self):
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self.set_undefined_options(
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'build',
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('build_scripts', 'build_dir'),
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('force', 'force'),
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('executable', 'executable'),
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)
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self.scripts = self.distribution.scripts
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def get_source_files(self):
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return self.scripts
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def run(self):
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if not self.scripts:
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return
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self.copy_scripts()
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def copy_scripts(self):
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"""
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Copy each script listed in ``self.scripts``.
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If a script is marked as a Python script (first line matches
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'shebang_pattern', i.e. starts with ``#!`` and contains
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"python"), then adjust in the copy the first line to refer to
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the current Python interpreter.
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"""
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self.mkpath(self.build_dir)
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outfiles = []
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updated_files = []
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for script in self.scripts:
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self._copy_script(script, outfiles, updated_files)
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self._change_modes(outfiles)
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return outfiles, updated_files
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def _copy_script(self, script, outfiles, updated_files): # noqa: C901
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shebang_match = None
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script = convert_path(script)
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outfile = os.path.join(self.build_dir, os.path.basename(script))
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outfiles.append(outfile)
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if not self.force and not newer(script, outfile):
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log.debug("not copying %s (up-to-date)", script)
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return
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# Always open the file, but ignore failures in dry-run mode
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# in order to attempt to copy directly.
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try:
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f = tokenize.open(script)
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except OSError:
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if not self.dry_run:
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raise
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f = None
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else:
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first_line = f.readline()
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if not first_line:
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self.warn("%s is an empty file (skipping)" % script)
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return
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shebang_match = shebang_pattern.match(first_line)
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updated_files.append(outfile)
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if shebang_match:
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log.info("copying and adjusting %s -> %s", script, self.build_dir)
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if not self.dry_run:
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if not sysconfig.python_build:
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executable = self.executable
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else:
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executable = os.path.join(
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sysconfig.get_config_var("BINDIR"),
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"python%s%s"
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% (
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sysconfig.get_config_var("VERSION"),
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sysconfig.get_config_var("EXE"),
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),
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)
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post_interp = shebang_match.group(1) or ''
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shebang = "#!" + executable + post_interp + "\n"
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self._validate_shebang(shebang, f.encoding)
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with open(outfile, "w", encoding=f.encoding) as outf:
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outf.write(shebang)
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outf.writelines(f.readlines())
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if f:
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f.close()
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else:
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if f:
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f.close()
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self.copy_file(script, outfile)
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def _change_modes(self, outfiles):
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if os.name != 'posix':
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return
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for file in outfiles:
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self._change_mode(file)
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def _change_mode(self, file):
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if self.dry_run:
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log.info("changing mode of %s", file)
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return
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oldmode = os.stat(file)[ST_MODE] & 0o7777
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newmode = (oldmode | 0o555) & 0o7777
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if newmode != oldmode:
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log.info("changing mode of %s from %o to %o", file, oldmode, newmode)
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os.chmod(file, newmode)
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@staticmethod
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def _validate_shebang(shebang, encoding):
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# Python parser starts to read a script using UTF-8 until
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# it gets a #coding:xxx cookie. The shebang has to be the
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# first line of a file, the #coding:xxx cookie cannot be
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# written before. So the shebang has to be encodable to
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# UTF-8.
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try:
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shebang.encode('utf-8')
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except UnicodeEncodeError:
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raise ValueError(
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"The shebang ({!r}) is not encodable " "to utf-8".format(shebang)
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)
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# If the script is encoded to a custom encoding (use a
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# #coding:xxx cookie), the shebang has to be encodable to
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# the script encoding too.
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try:
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shebang.encode(encoding)
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except UnicodeEncodeError:
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raise ValueError(
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"The shebang ({!r}) is not encodable "
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"to the script encoding ({})".format(shebang, encoding)
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)
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