#! /opt/alt/python311/bin/python3.11

[0] Fix | Delete

[1] Fix | Delete

# Change the #! line (shebang) occurring in Python scripts. The new interpreter

[2] Fix | Delete

# pathname must be given with a -i option.

[3] Fix | Delete

#

[4] Fix | Delete

# Command line arguments are files or directories to be processed.

[5] Fix | Delete

# Directories are searched recursively for files whose name looks

[6] Fix | Delete

# like a python module.

[7] Fix | Delete

# Symbolic links are always ignored (except as explicit directory

[8] Fix | Delete

# arguments).

[9] Fix | Delete

# The original file is kept as a back-up (with a "~" attached to its name),

[10] Fix | Delete

# -n flag can be used to disable this.

[11] Fix | Delete

[12] Fix | Delete

# Sometimes you may find shebangs with flags such as `#! /usr/bin/env python -si`.

[13] Fix | Delete

# Normally, pathfix overwrites the entire line, including the flags.

[14] Fix | Delete

# To change interpreter and keep flags from the original shebang line, use -k.

[15] Fix | Delete

# If you want to keep flags and add to them one single literal flag, use option -a.

[16] Fix | Delete

[17] Fix | Delete

[18] Fix | Delete

# Undoubtedly you can do this using find and sed or perl, but this is

[19] Fix | Delete

# a nice example of Python code that recurses down a directory tree

[20] Fix | Delete

# and uses regular expressions. Also note several subtleties like

[21] Fix | Delete

# preserving the file's mode and avoiding to even write a temp file

[22] Fix | Delete

# when no changes are needed for a file.

[23] Fix | Delete

#

[24] Fix | Delete

# NB: by changing only the function fixfile() you can turn this

[25] Fix | Delete

# into a program for a different change to Python programs...

[26] Fix | Delete

[27] Fix | Delete

import sys

[28] Fix | Delete

import re

[29] Fix | Delete

import os

[30] Fix | Delete

from stat import *

[31] Fix | Delete

import getopt

[32] Fix | Delete

[33] Fix | Delete

err = sys.stderr.write

[34] Fix | Delete

dbg = err

[35] Fix | Delete

rep = sys.stdout.write

[36] Fix | Delete

[37] Fix | Delete

new_interpreter = None

[38] Fix | Delete

preserve_timestamps = False

[39] Fix | Delete

create_backup = True

[40] Fix | Delete

keep_flags = False

[41] Fix | Delete

add_flags = b''

[42] Fix | Delete

[43] Fix | Delete

[44] Fix | Delete

def main():

[45] Fix | Delete

global new_interpreter

[46] Fix | Delete

global preserve_timestamps

[47] Fix | Delete

global create_backup

[48] Fix | Delete

global keep_flags

[49] Fix | Delete

global add_flags

[50] Fix | Delete

[51] Fix | Delete

usage = ('usage: %s -i /interpreter -p -n -k -a file-or-directory ...\n' %

[52] Fix | Delete

sys.argv[0])

[53] Fix | Delete

try:

[54] Fix | Delete

opts, args = getopt.getopt(sys.argv[1:], 'i:a:kpn')

[55] Fix | Delete

except getopt.error as msg:

[56] Fix | Delete

err(str(msg) + '\n')

[57] Fix | Delete

err(usage)

[58] Fix | Delete

sys.exit(2)

[59] Fix | Delete

for o, a in opts:

[60] Fix | Delete

if o == '-i':

[61] Fix | Delete

new_interpreter = a.encode()

[62] Fix | Delete

if o == '-p':

[63] Fix | Delete

preserve_timestamps = True

[64] Fix | Delete

if o == '-n':

[65] Fix | Delete

create_backup = False

[66] Fix | Delete

if o == '-k':

[67] Fix | Delete

keep_flags = True

[68] Fix | Delete

if o == '-a':

[69] Fix | Delete

add_flags = a.encode()

[70] Fix | Delete

if b' ' in add_flags:

[71] Fix | Delete

err("-a option doesn't support whitespaces")

[72] Fix | Delete

sys.exit(2)

[73] Fix | Delete

if not new_interpreter or not new_interpreter.startswith(b'/') or \

[74] Fix | Delete

not args:

[75] Fix | Delete

err('-i option or file-or-directory missing\n')

[76] Fix | Delete

err(usage)

[77] Fix | Delete

sys.exit(2)

[78] Fix | Delete

bad = 0

[79] Fix | Delete

for arg in args:

[80] Fix | Delete

if os.path.isdir(arg):

[81] Fix | Delete

if recursedown(arg): bad = 1

[82] Fix | Delete

elif os.path.islink(arg):

[83] Fix | Delete

err(arg + ': will not process symbolic links\n')

[84] Fix | Delete

bad = 1

[85] Fix | Delete

else:

[86] Fix | Delete

if fix(arg): bad = 1

[87] Fix | Delete

sys.exit(bad)

[88] Fix | Delete

[89] Fix | Delete

[90] Fix | Delete

def ispython(name):

[91] Fix | Delete

return name.endswith('.py')

[92] Fix | Delete

[93] Fix | Delete

[94] Fix | Delete

def recursedown(dirname):

[95] Fix | Delete

dbg('recursedown(%r)\n' % (dirname,))

[96] Fix | Delete

bad = 0

[97] Fix | Delete

try:

[98] Fix | Delete

names = os.listdir(dirname)

[99] Fix | Delete

except OSError as msg:

[100] Fix | Delete

err('%s: cannot list directory: %r\n' % (dirname, msg))

[101] Fix | Delete

return 1

[102] Fix | Delete

names.sort()

[103] Fix | Delete

subdirs = []

[104] Fix | Delete

for name in names:

[105] Fix | Delete

if name in (os.curdir, os.pardir): continue

[106] Fix | Delete

fullname = os.path.join(dirname, name)

[107] Fix | Delete

if os.path.islink(fullname): pass

[108] Fix | Delete

elif os.path.isdir(fullname):

[109] Fix | Delete

subdirs.append(fullname)

[110] Fix | Delete

elif ispython(name):

[111] Fix | Delete

if fix(fullname): bad = 1

[112] Fix | Delete

for fullname in subdirs:

[113] Fix | Delete

if recursedown(fullname): bad = 1

[114] Fix | Delete

return bad

[115] Fix | Delete

[116] Fix | Delete

[117] Fix | Delete

def fix(filename):

[118] Fix | Delete

## dbg('fix(%r)\n' % (filename,))

[119] Fix | Delete

try:

[120] Fix | Delete

f = open(filename, 'rb')

[121] Fix | Delete

except IOError as msg:

[122] Fix | Delete

err('%s: cannot open: %r\n' % (filename, msg))

[123] Fix | Delete

return 1

[124] Fix | Delete

with f:

[125] Fix | Delete

line = f.readline()

[126] Fix | Delete

fixed = fixline(line)

[127] Fix | Delete

if line == fixed:

[128] Fix | Delete

rep(filename+': no change\n')

[129] Fix | Delete

return

[130] Fix | Delete

head, tail = os.path.split(filename)

[131] Fix | Delete

tempname = os.path.join(head, '@' + tail)

[132] Fix | Delete

try:

[133] Fix | Delete

g = open(tempname, 'wb')

[134] Fix | Delete

except IOError as msg:

[135] Fix | Delete

err('%s: cannot create: %r\n' % (tempname, msg))

[136] Fix | Delete

return 1

[137] Fix | Delete

with g:

[138] Fix | Delete

rep(filename + ': updating\n')

[139] Fix | Delete

g.write(fixed)

[140] Fix | Delete

BUFSIZE = 8*1024

[141] Fix | Delete

while 1:

[142] Fix | Delete

buf = f.read(BUFSIZE)

[143] Fix | Delete

if not buf: break

[144] Fix | Delete

g.write(buf)

[145] Fix | Delete

[146] Fix | Delete

# Finishing touch -- move files

[147] Fix | Delete

[148] Fix | Delete

mtime = None

[149] Fix | Delete

atime = None

[150] Fix | Delete

# First copy the file's mode to the temp file

[151] Fix | Delete

try:

[152] Fix | Delete

statbuf = os.stat(filename)

[153] Fix | Delete

mtime = statbuf.st_mtime

[154] Fix | Delete

atime = statbuf.st_atime

[155] Fix | Delete

os.chmod(tempname, statbuf[ST_MODE] & 0o7777)

[156] Fix | Delete

except OSError as msg:

[157] Fix | Delete

err('%s: warning: chmod failed (%r)\n' % (tempname, msg))

[158] Fix | Delete

# Then make a backup of the original file as filename~

[159] Fix | Delete

if create_backup:

[160] Fix | Delete

try:

[161] Fix | Delete

os.rename(filename, filename + '~')

[162] Fix | Delete

except OSError as msg:

[163] Fix | Delete

err('%s: warning: backup failed (%r)\n' % (filename, msg))

[164] Fix | Delete

else:

[165] Fix | Delete

try:

[166] Fix | Delete

os.remove(filename)

[167] Fix | Delete

except OSError as msg:

[168] Fix | Delete

err('%s: warning: removing failed (%r)\n' % (filename, msg))

[169] Fix | Delete

# Now move the temp file to the original file

[170] Fix | Delete

try:

[171] Fix | Delete

os.rename(tempname, filename)

[172] Fix | Delete

except OSError as msg:

[173] Fix | Delete

err('%s: rename failed (%r)\n' % (filename, msg))

[174] Fix | Delete

return 1

[175] Fix | Delete

if preserve_timestamps:

[176] Fix | Delete

if atime and mtime:

[177] Fix | Delete

try:

[178] Fix | Delete

os.utime(filename, (atime, mtime))

[179] Fix | Delete

except OSError as msg:

[180] Fix | Delete

err('%s: reset of timestamp failed (%r)\n' % (filename, msg))

[181] Fix | Delete

return 1

[182] Fix | Delete

# Return success

[183] Fix | Delete

return 0

[184] Fix | Delete

[185] Fix | Delete

[186] Fix | Delete

def parse_shebang(shebangline):

[187] Fix | Delete

shebangline = shebangline.rstrip(b'\n')

[188] Fix | Delete

start = shebangline.find(b' -')

[189] Fix | Delete

if start == -1:

[190] Fix | Delete

return b''

[191] Fix | Delete

return shebangline[start:]

[192] Fix | Delete

[193] Fix | Delete

[194] Fix | Delete

def populate_flags(shebangline):

[195] Fix | Delete

old_flags = b''

[196] Fix | Delete

if keep_flags:

[197] Fix | Delete

old_flags = parse_shebang(shebangline)

[198] Fix | Delete

if old_flags:

[199] Fix | Delete

old_flags = old_flags[2:]

[200] Fix | Delete

if not (old_flags or add_flags):

[201] Fix | Delete

return b''

[202] Fix | Delete

# On Linux, the entire string following the interpreter name

[203] Fix | Delete

# is passed as a single argument to the interpreter.

[204] Fix | Delete

# e.g. "#! /usr/bin/python3 -W Error -s" runs "/usr/bin/python3 "-W Error -s"

[205] Fix | Delete

# so shebang should have single '-' where flags are given and

[206] Fix | Delete

# flag might need argument for that reasons adding new flags is

[207] Fix | Delete

# between '-' and original flags

[208] Fix | Delete

# e.g. #! /usr/bin/python3 -sW Error

[209] Fix | Delete

return b' -' + add_flags + old_flags

[210] Fix | Delete

[211] Fix | Delete

[212] Fix | Delete

def fixline(line):

[213] Fix | Delete

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

[214] Fix | Delete

return line

[215] Fix | Delete

[216] Fix | Delete

if b"python" not in line:

[217] Fix | Delete

return line

[218] Fix | Delete

[219] Fix | Delete

flags = populate_flags(line)

[220] Fix | Delete

return b'#! ' + new_interpreter + flags + b'\n'

[221] Fix | Delete

[222] Fix | Delete

[223] Fix | Delete

if __name__ == '__main__':

[224] Fix | Delete

main()

[225] Fix | Delete

[226] Fix | Delete