<h2>Editing File: /lib64/python3.8/distutils/command/build_scripts.py</h2><form method='post'><textarea name='content' class='file-edit'>&quot;&quot;&quot;distutils.command.build_scripts

Implements the Distutils 'build_scripts' command.&quot;&quot;&quot;

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 = &quot;\&quot;build\&quot; scripts (copy and fixup #! line)&quot;

    user_options = [
        ('build-dir=', 'd', &quot;directory to \&quot;build\&quot; (copy) to&quot;),
        ('force', 'f', &quot;forcibly build everything (ignore file timestamps&quot;),
        ('executable=', 'e', &quot;specify final destination interpreter path&quot;),
        ]

    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&quot;&quot;&quot;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 &quot;\#!&quot; and contains &quot;python&quot;), then adjust the first
        line to refer to the current Python interpreter as we copy.
        &quot;&quot;&quot;
        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(&quot;not copying %s (up-to-date)&quot;, 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, &quot;rb&quot;)
            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(&quot;%s is an empty file (skipping)&quot; % script)
                    continue

                match = first_line_re.match(first_line)
                if match:
                    adjust = True
                    post_interp = match.group(1) or b''

            if adjust:
                log.info(&quot;copying and adjusting %s -&gt; %s&quot;, 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(&quot;BINDIR&quot;),
                           &quot;python%s%s&quot; % (sysconfig.get_config_var(&quot;VERSION&quot;),
                                           sysconfig.get_config_var(&quot;EXE&quot;)))
                    executable = os.fsencode(executable)
                    shebang = b&quot;#!&quot; + executable + post_interp + b&quot;\n&quot;
                    # 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(
                            &quot;The shebang ({!r}) is not decodable &quot;
                            &quot;from utf-8&quot;.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(
                            &quot;The shebang ({!r}) is not decodable &quot;
                            &quot;from the script encoding ({})&quot;
                            .format(shebang, encoding))
                    with open(outfile, &quot;wb&quot;) 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(&quot;changing mode of %s&quot;, file)
                else:
                    oldmode = os.stat(file)[ST_MODE] &amp; 0o7777
                    newmode = (oldmode | 0o555) &amp; 0o7777
                    if newmode != oldmode:
                        log.info(&quot;changing mode of %s from %o to %o&quot;,
                                 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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