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Edit File : pathfix.py \| Size : 6.64 KB
#! /opt/alt/python38/bin/python3.8 # 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 "~" 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'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'' def main(): global new_interpreter global preserve_timestamps global create_backup global keep_flags global add_flags usage = ('usage: %s -i /interpreter -p -n -k -a file-or-directory ...\n' % sys.argv[0]) try: opts, args = getopt.getopt(sys.argv[1:], 'i:a:kpn') except getopt.error as msg: err(str(msg) + '\n') err(usage) sys.exit(2) for o, a in opts: if o == '-i': new_interpreter = a.encode() if o == '-p': preserve_timestamps = True if o == '-n': create_backup = False if o == '-k': keep_flags = True if o == '-a': add_flags = a.encode() if b' ' in add_flags: err("-a option doesn't support whitespaces") sys.exit(2) if not new_interpreter or not new_interpreter.startswith(b'/') or \ not args: err('-i option or file-or-directory missing\n') 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 + ': will not process symbolic links\n') bad = 1 else: if fix(arg): bad = 1 sys.exit(bad) def ispython(name): return name.endswith('.py') def recursedown(dirname): dbg('recursedown(%r)\n' % (dirname,)) bad = 0 try: names = os.listdir(dirname) except OSError as msg: err('%s: cannot list directory: %r\n' % (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('fix(%r)\n' % (filename,)) try: f = open(filename, 'rb') except IOError as msg: err('%s: cannot open: %r\n' % (filename, msg)) return 1 with f: line = f.readline() fixed = fixline(line) if line == fixed: rep(filename+': no change\n') return head, tail = os.path.split(filename) tempname = os.path.join(head, '@' + tail) try: g = open(tempname, 'wb') except IOError as msg: err('%s: cannot create: %r\n' % (tempname, msg)) return 1 with g: rep(filename + ': updating\n') g.write(fixed) BUFSIZE = 8*1024 while 1: buf = f.read(BUFSIZE) if not buf: break g.write(buf) # Finishing touch -- move files mtime = None atime = None # First copy the file'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] & 0o7777) except OSError as msg: err('%s: warning: chmod failed (%r)\n' % (tempname, msg)) # Then make a backup of the original file as filename~ if create_backup: try: os.rename(filename, filename + '~') except OSError as msg: err('%s: warning: backup failed (%r)\n' % (filename, msg)) else: try: os.remove(filename) except OSError as msg: err('%s: warning: removing failed (%r)\n' % (filename, msg)) # Now move the temp file to the original file try: os.rename(tempname, filename) except OSError as msg: err('%s: rename failed (%r)\n' % (filename, msg)) return 1 if preserve_timestamps: if atime and mtime: try: os.utime(filename, (atime, mtime)) except OSError as msg: err('%s: reset of timestamp failed (%r)\n' % (filename, msg)) return 1 # Return success return 0 def parse_shebang(shebangline): shebangline = shebangline.rstrip(b'\n') start = shebangline.find(b' -') if start == -1: return b'' return shebangline[start:] def populate_flags(shebangline): old_flags = b'' 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'' # On Linux, the entire string following the interpreter name # is passed as a single argument to the interpreter. # e.g. "#! /usr/bin/python3 -W Error -s" runs "/usr/bin/python3 "-W Error -s" # so shebang should have single '-' where flags are given and # flag might need argument for that reasons adding new flags is # between '-' and original flags # e.g. #! /usr/bin/python3 -sW Error return b' -' + add_flags + old_flags def fixline(line): if not line.startswith(b'#!'): return line if b"python" not in line: return line flags = populate_flags(line) return b'#! ' + new_interpreter + flags + b'\n' if __name__ == '__main__': main() Back

Edit File : pathfix.py | Size : 6.64 KB

#! /opt/alt/python38/bin/python3.8

# 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 "~" 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'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''

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

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

def ispython(name):
    return name.endswith('.py')

def recursedown(dirname):
    dbg('recursedown(%r)\n' % (dirname,))
    bad = 0
    try:
        names = os.listdir(dirname)
    except OSError as msg:
        err('%s: cannot list directory: %r\n' % (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('fix(%r)\n' % (filename,))
    try:
        f = open(filename, 'rb')
    except IOError as msg:
        err('%s: cannot open: %r\n' % (filename, msg))
        return 1
    with f:
        line = f.readline()
        fixed = fixline(line)
        if line == fixed:
            rep(filename+': no change\n')
            return
        head, tail = os.path.split(filename)
        tempname = os.path.join(head, '@' + tail)
        try:
            g = open(tempname, 'wb')
        except IOError as msg:
            err('%s: cannot create: %r\n' % (tempname, msg))
            return 1
        with g:
            rep(filename + ': updating\n')
            g.write(fixed)
            BUFSIZE = 8*1024
            while 1:
                buf = f.read(BUFSIZE)
                if not buf: break
                g.write(buf)

# Finishing touch -- move files

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

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

def populate_flags(shebangline):
    old_flags = b''
    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''
    # On Linux, the entire string following the interpreter name
    # is passed as a single argument to the interpreter.
    # e.g. "#! /usr/bin/python3 -W Error -s" runs "/usr/bin/python3 "-W Error -s"
    # so shebang should have single '-' where flags are given and
    # flag might need argument for that reasons adding new flags is
    # between '-' and original flags
    # e.g. #! /usr/bin/python3 -sW Error
    return b' -' + add_flags + old_flags

def fixline(line):
    if not line.startswith(b'#!'):
        return line

if b"python" not in line:
        return line

flags = populate_flags(line)
    return b'#! ' + new_interpreter + flags + b'\n'

if __name__ == '__main__':
    main()

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