Showing the changes to sys/src/cmd/python/Tools/scripts/pathfix.py (1 of 3706 files). Show all
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| 1 | +#! /usr/bin/env python | |
| 2 | + | |
| 3 | +# Change the #! line occurring in Python scripts. The new interpreter | |
| 4 | +# pathname must be given with a -i option. | |
| 5 | +# | |
| 6 | +# Command line arguments are files or directories to be processed. | |
| 7 | +# Directories are searched recursively for files whose name looks | |
| 8 | +# like a python module. | |
| 9 | +# Symbolic links are always ignored (except as explicit directory | |
| 10 | +# arguments). Of course, the original file is kept as a back-up | |
| 11 | +# (with a "~" attached to its name). | |
| 12 | +# | |
| 13 | +# Undoubtedly you can do this using find and sed or perl, but this is | |
| 14 | +# a nice example of Python code that recurses down a directory tree | |
| 15 | +# and uses regular expressions. Also note several subtleties like | |
| 16 | +# preserving the file's mode and avoiding to even write a temp file | |
| 17 | +# when no changes are needed for a file. | |
| 18 | +# | |
| 19 | +# NB: by changing only the function fixfile() you can turn this | |
| 20 | +# into a program for a different change to Python programs... | |
| 21 | + | |
| 22 | +import sys | |
| 23 | +import re | |
| 24 | +import os | |
| 25 | +from stat import * | |
| 26 | +import getopt | |
| 27 | + | |
| 28 | +err = sys.stderr.write | |
| 29 | +dbg = err | |
| 30 | +rep = sys.stdout.write | |
| 31 | + | |
| 32 | +new_interpreter = None | |
| 33 | + | |
| 34 | +def main(): | |
| 35 | + global new_interpreter | |
| 36 | + usage = ('usage: %s -i /interpreter file-or-directory ...\n' % | |
| 37 | + sys.argv[0]) | |
| 38 | + try: | |
| 39 | + opts, args = getopt.getopt(sys.argv[1:], 'i:') | |
| 40 | + except getopt.error, msg: | |
| 41 | + err(msg + '\n') | |
| 42 | + err(usage) | |
| 43 | + sys.exit(2) | |
| 44 | + for o, a in opts: | |
| 45 | + if o == '-i': | |
| 46 | + new_interpreter = a | |
| 47 | + if not new_interpreter or new_interpreter[0] != '/' or not args: | |
| 48 | + err('-i option or file-or-directory missing\n') | |
| 49 | + err(usage) | |
| 50 | + sys.exit(2) | |
| 51 | + bad = 0 | |
| 52 | + for arg in args: | |
| 53 | + if os.path.isdir(arg): | |
| 54 | + if recursedown(arg): bad = 1 | |
| 55 | + elif os.path.islink(arg): | |
| 56 | + err(arg + ': will not process symbolic links\n') | |
| 57 | + bad = 1 | |
| 58 | + else: | |
| 59 | + if fix(arg): bad = 1 | |
| 60 | + sys.exit(bad) | |
| 61 | + | |
| 62 | +ispythonprog = re.compile('^[a-zA-Z0-9_]+\.py$') | |
| 63 | +def ispython(name): | |
| 64 | + return ispythonprog.match(name) >= 0 | |
| 65 | + | |
| 66 | +def recursedown(dirname): | |
| 67 | + dbg('recursedown(%r)\n' % (dirname,)) | |
| 68 | + bad = 0 | |
| 69 | + try: | |
| 70 | + names = os.listdir(dirname) | |
| 71 | + except os.error, msg: | |
| 72 | + err('%s: cannot list directory: %r\n' % (dirname, msg)) | |
| 73 | + return 1 | |
| 74 | + names.sort() | |
| 75 | + subdirs = [] | |
| 76 | + for name in names: | |
| 77 | + if name in (os.curdir, os.pardir): continue | |
| 78 | + fullname = os.path.join(dirname, name) | |
| 79 | + if os.path.islink(fullname): pass | |
| 80 | + elif os.path.isdir(fullname): | |
| 81 | + subdirs.append(fullname) | |
| 82 | + elif ispython(name): | |
| 83 | + if fix(fullname): bad = 1 | |
| 84 | + for fullname in subdirs: | |
| 85 | + if recursedown(fullname): bad = 1 | |
| 86 | + return bad | |
| 87 | + | |
| 88 | +def fix(filename): | |
| 89 | +## dbg('fix(%r)\n' % (filename,)) | |
| 90 | + try: | |
| 91 | + f = open(filename, 'r') | |
| 92 | + except IOError, msg: | |
| 93 | + err('%s: cannot open: %r\n' % (filename, msg)) | |
| 94 | + return 1 | |
| 95 | + line = f.readline() | |
| 96 | + fixed = fixline(line) | |
| 97 | + if line == fixed: | |
| 98 | + rep(filename+': no change\n') | |
| 99 | + f.close() | |
| 100 | + return | |
| 101 | + head, tail = os.path.split(filename) | |
| 102 | + tempname = os.path.join(head, '@' + tail) | |
| 103 | + try: | |
| 104 | + g = open(tempname, 'w') | |
| 105 | + except IOError, msg: | |
| 106 | + f.close() | |
| 107 | + err('%s: cannot create: %r\n' % (tempname, msg)) | |
| 108 | + return 1 | |
| 109 | + rep(filename + ': updating\n') | |
| 110 | + g.write(fixed) | |
| 111 | + BUFSIZE = 8*1024 | |
| 112 | + while 1: | |
| 113 | + buf = f.read(BUFSIZE) | |
| 114 | + if not buf: break | |
| 115 | + g.write(buf) | |
| 116 | + g.close() | |
| 117 | + f.close() | |
| 118 | + | |
| 119 | + # Finishing touch -- move files | |
| 120 | + | |
| 121 | + # First copy the file's mode to the temp file | |
| 122 | + try: | |
| 123 | + statbuf = os.stat(filename) | |
| 124 | + os.chmod(tempname, statbuf[ST_MODE] & 07777) | |
| 125 | + except os.error, msg: | |
| 126 | + err('%s: warning: chmod failed (%r)\n' % (tempname, msg)) | |
| 127 | + # Then make a backup of the original file as filename~ | |
| 128 | + try: | |
| 129 | + os.rename(filename, filename + '~') | |
| 130 | + except os.error, msg: | |
| 131 | + err('%s: warning: backup failed (%r)\n' % (filename, msg)) | |
| 132 | + # Now move the temp file to the original file | |
| 133 | + try: | |
| 134 | + os.rename(tempname, filename) | |
| 135 | + except os.error, msg: | |
| 136 | + err('%s: rename failed (%r)\n' % (filename, msg)) | |
| 137 | + return 1 | |
| 138 | + # Return succes | |
| 139 | + return 0 | |
| 140 | + | |
| 141 | +def fixline(line): | |
| 142 | + if not line.startswith('#!'): | |
| 143 | + return line | |
| 144 | + if "python" not in line: | |
| 145 | + return line | |
| 146 | + return '#! %s\n' % new_interpreter | |
| 147 | + | |
| 148 | +if __name__ == '__main__': | |
| 149 | + main() | |