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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">#! /usr/libexec/platform-python

# Change the #! line (shebang) occurring in Python scripts.  The new interpreter
# pathname must be given with a -i option.
#
# Command line arguments are files or directories to be processed.
# Directories are searched recursively for files whose name looks
# like a python module.
# Symbolic links are always ignored (except as explicit directory
# arguments).
# The original file is kept as a back-up (with a &quot;~&quot; attached to its name),
# -n flag can be used to disable this.

# Sometimes you may find shebangs with flags such as `#! /usr/bin/env python -si`.
# Normally, pathfix overwrites the entire line, including the flags.
# To change interpreter and keep flags from the original shebang line, use -k.
# If you want to keep flags and add to them one single literal flag, use option -a.


# Undoubtedly you can do this using find and sed or perl, but this is
# a nice example of Python code that recurses down a directory tree
# and uses regular expressions.  Also note several subtleties like
# preserving the file&#039;s mode and avoiding to even write a temp file
# when no changes are needed for a file.
#
# NB: by changing only the function fixfile() you can turn this
# into a program for a different change to Python programs...

import sys
import re
import os
from stat import *
import getopt

err = sys.stderr.write
dbg = err
rep = sys.stdout.write

new_interpreter = None
preserve_timestamps = False
create_backup = True
keep_flags = False
add_flags = b&#039;&#039;


def main():
    global new_interpreter
    global preserve_timestamps
    global create_backup
    global keep_flags
    global add_flags

    usage = (&#039;usage: %s -i /interpreter -p -n -k -a file-or-directory ...\n&#039; %
             sys.argv[0])
    try:
        opts, args = getopt.getopt(sys.argv[1:], &#039;i:a:kpn&#039;)
    except getopt.error as msg:
        err(str(msg) + &#039;\n&#039;)
        err(usage)
        sys.exit(2)
    for o, a in opts:
        if o == &#039;-i&#039;:
            new_interpreter = a.encode()
        if o == &#039;-p&#039;:
            preserve_timestamps = True
        if o == &#039;-n&#039;:
            create_backup = False
        if o == &#039;-k&#039;:
            keep_flags = True
        if o == &#039;-a&#039;:
            add_flags = a.encode()
            if b&#039; &#039; in add_flags:
                err(&quot;-a option doesn&#039;t support whitespaces&quot;)
                sys.exit(2)
    if not new_interpreter or not new_interpreter.startswith(b&#039;/&#039;) or \
           not args:
        err(&#039;-i option or file-or-directory missing\n&#039;)
        err(usage)
        sys.exit(2)
    bad = 0
    for arg in args:
        if os.path.isdir(arg):
            if recursedown(arg): bad = 1
        elif os.path.islink(arg):
            err(arg + &#039;: will not process symbolic links\n&#039;)
            bad = 1
        else:
            if fix(arg): bad = 1
    sys.exit(bad)


ispythonprog = re.compile(r&#039;^[a-zA-Z0-9_]+\.py$&#039;)


def ispython(name):
    return bool(ispythonprog.match(name))


def recursedown(dirname):
    dbg(&#039;recursedown(%r)\n&#039; % (dirname,))
    bad = 0
    try:
        names = os.listdir(dirname)
    except OSError as msg:
        err(&#039;%s: cannot list directory: %r\n&#039; % (dirname, msg))
        return 1
    names.sort()
    subdirs = []
    for name in names:
        if name in (os.curdir, os.pardir): continue
        fullname = os.path.join(dirname, name)
        if os.path.islink(fullname): pass
        elif os.path.isdir(fullname):
            subdirs.append(fullname)
        elif ispython(name):
            if fix(fullname): bad = 1
    for fullname in subdirs:
        if recursedown(fullname): bad = 1
    return bad


def fix(filename):
##  dbg(&#039;fix(%r)\n&#039; % (filename,))
    try:
        f = open(filename, &#039;rb&#039;)
    except IOError as msg:
        err(&#039;%s: cannot open: %r\n&#039; % (filename, msg))
        return 1
    line = f.readline()
    fixed = fixline(line)
    if line == fixed:
        rep(filename+&#039;: no change\n&#039;)
        f.close()
        return
    head, tail = os.path.split(filename)
    tempname = os.path.join(head, &#039;@&#039; + tail)
    try:
        g = open(tempname, &#039;wb&#039;)
    except IOError as msg:
        f.close()
        err(&#039;%s: cannot create: %r\n&#039; % (tempname, msg))
        return 1
    rep(filename + &#039;: updating\n&#039;)
    g.write(fixed)
    BUFSIZE = 8*1024
    while 1:
        buf = f.read(BUFSIZE)
        if not buf: break
        g.write(buf)
    g.close()
    f.close()

    # Finishing touch -- move files

    mtime = None
    atime = None
    # First copy the file&#039;s mode to the temp file
    try:
        statbuf = os.stat(filename)
        mtime = statbuf.st_mtime
        atime = statbuf.st_atime
        os.chmod(tempname, statbuf[ST_MODE] &amp; 0o7777)
    except OSError as msg:
        err(&#039;%s: warning: chmod failed (%r)\n&#039; % (tempname, msg))
    # Then make a backup of the original file as filename~
    if create_backup:
        try:
            os.rename(filename, filename + &#039;~&#039;)
        except OSError as msg:
            err(&#039;%s: warning: backup failed (%r)\n&#039; % (filename, msg))
    else:
        try:
            os.remove(filename)
        except OSError as msg:
            err(&#039;%s: warning: removing failed (%r)\n&#039; % (filename, msg))
    # Now move the temp file to the original file
    try:
        os.rename(tempname, filename)
    except OSError as msg:
        err(&#039;%s: rename failed (%r)\n&#039; % (filename, msg))
        return 1
    if preserve_timestamps:
        if atime and mtime:
            try:
                os.utime(filename, (atime, mtime))
            except OSError as msg:
                err(&#039;%s: reset of timestamp failed (%r)\n&#039; % (filename, msg))
                return 1
    # Return success
    return 0


def parse_shebang(shebangline):
    shebangline = shebangline.rstrip(b&#039;\n&#039;)
    start = shebangline.find(b&#039; -&#039;)
    if start == -1:
        return b&#039;&#039;
    return shebangline[start:]


def populate_flags(shebangline):
    old_flags = b&#039;&#039;
    if keep_flags:
        old_flags = parse_shebang(shebangline)
        if old_flags:
            old_flags = old_flags[2:]
    if not (old_flags or add_flags):
        return b&#039;&#039;
    # On Linux, the entire string following the interpreter name
    # is passed as a single argument to the interpreter.
    # e.g. &quot;#! /usr/bin/python3 -W Error -s&quot; runs &quot;/usr/bin/python3 &quot;-W Error -s&quot;
    # so shebang should have single &#039;-&#039; where flags are given and
    # flag might need argument for that reasons adding new flags is
    # between &#039;-&#039; and original flags
    # e.g. #! /usr/bin/python3 -sW Error
    return b&#039; -&#039; + add_flags + old_flags


def fixline(line):
    if not line.startswith(b&#039;#!&#039;):
        return line

    if b&quot;python&quot; not in line:
        return line

    flags = populate_flags(line)
    return b&#039;#! &#039; + new_interpreter + flags + b&#039;\n&#039;


if __name__ == &#039;__main__&#039;:
    main()
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