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annotate toys/posix/chmod.c @ 674:7e846e281e38

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New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
author Rob Landley <rob@landley.net>
date Mon, 08 Oct 2012 00:02:30 -0500
parents 6df4ccc0acbe
children 786841fdb1e0
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * chmod.c - Change file mode bits
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4 *
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5 * Copyright 2012 Rob Landley <rob@landley.net>
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6 *
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7 * See http://opengroup.org/onlinepubs/9699919799/utilities/chmod.html
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8
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9 USE_CHMOD(NEWTOY(chmod, "<2?vR", TOYFLAG_BIN))
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10
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11 config CHMOD
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12 bool "chmod"
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13 default y
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14 help
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15 usage: chmod [-R] MODE FILE...
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16
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17 Change mode of listed file[s] (recursively with -R).
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18
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19 MODE can be (comma-separated) stanzas: [ugoa][+-=][rwxstXugo]
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20
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21 Stanzas are applied in order: For each category (u = user,
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22 g = group, o = other, a = all three, if none specified default is a),
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23 set (+), clear (-), or copy (=), r = read, w = write, x = execute.
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24 s = u+s = suid, g+s = sgid, o+s = sticky. (+t is an alias for o+s).
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25 suid/sgid: execute as the user/group who owns the file.
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26 sticky: can't delete files you don't own out of this directory
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27 X = x for directories or if any category already has x set.
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28
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29 Or MODE can be an octal value up to 7777 ug uuugggooo top +
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30 bit 1 = o+x, bit 1<<8 = u+w, 1<<11 = g+1 sstrwxrwxrwx bottom
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31
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32 Examples:
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33 chmod u+w file - allow owner of "file" to write to it.
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34 chmod 744 file - user can read/write/execute, everyone else read only
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35 */
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36
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37 #define FOR_chmod
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38 #include "toys.h"
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39
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40 GLOBALS(
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41 char *mode;
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42 )
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43
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44 int do_chmod(struct dirtree *try)
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45 {
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46 mode_t mode;
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47
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48 if (!dirtree_notdotdot(try)) return 0;
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50 mode = string_to_mode(TT.mode, try->st.st_mode);
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51 if (toys.optflags & FLAG_v) {
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52 char *s = dirtree_path(try, 0);
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53 printf("chmod '%s' to %04o\n", s, mode);
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54 free(s);
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55 }
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56 wfchmodat(dirtree_parentfd(try), try->name, mode);
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58 return (toys.optflags & FLAG_R) ? DIRTREE_RECURSE : 0;
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59 }
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61 void chmod_main(void)
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62 {
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63 TT.mode = *toys.optargs;
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64 char **file;
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66 for (file = toys.optargs+1; *file; file++) dirtree_read(*file, do_chmod);
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67 }