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annotate toys/chmod.c @ 594:051dffe00b99

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The linux from scratch build wants -v on chmod.
author Rob Landley <rob@landley.net>
date Sun, 10 Jun 2012 19:44:33 -0500
parents 7becb497c3c4
children a6a541b7fc34
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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://pubs.opengroup.org/onlinepubs/009695399/utilities/chmod.html
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8 *
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9
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10 USE_CHMOD(NEWTOY(chmod, "<2?vR", TOYFLAG_BIN))
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11
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12 config CHMOD
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13 bool "chmod"
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14 default y
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15 help
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16 usage: chmod [-R] MODE FILE...
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17
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18 Change mode of listed file[s] (recursively with -R).
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19
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20 MODE can be (comma-separated) stanzas: [ugoa][+-=][rwxstXugo]
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21
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22 Stanzas are applied in order: For each category (u = user,
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23 g = group, o = other, a = all three, if none specified default is a),
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24 set (+), clear (-), or copy (=), r = read, w = write, x = execute.
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25 s = u+s = suid, g+s = sgid, o+s = sticky. (+t is an alias for o+s).
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26 suid/sgid: execute as the user/group who owns the file.
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27 sticky: can't delete files you don't own out of this directory
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28 X = x for directories or if any category already has x set.
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29
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30 Or MODE can be an octal value up to 7777 ug uuugggooo top +
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31 bit 1 = o+x, bit 1<<8 = u+w, 1<<11 = g+1 sstrwxrwxrwx bottom
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32
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33 Examples:
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34 chmod u+w file - allow owner of "file" to write to it.
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35 chmod 744 file - user can read/write/execute, everyone else read only
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36 */
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37
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38 #include "toys.h"
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39
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40 DEFINE_GLOBALS(
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41 char *mode;
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42 )
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43
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44 #define TT this.chmod
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45
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46 #define FLAG_R 1
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47 #define FLAG_v 2
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48
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49 int do_chmod(struct dirtree *try)
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50 {
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51 mode_t mode;
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52
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53 if (!dirtree_notdotdot(try)) return 0;
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54
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55 mode = string_to_mode(TT.mode, try->st.st_mode);
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56 if (toys.optflags & FLAG_v) {
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57 char *s = dirtree_path(try, 0);
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58 printf("chmod '%s' to %04o\n", s, mode);
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59 free(s);
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60 }
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61 wfchmodat(try->parent ? try->parent->data : AT_FDCWD, try->name, mode);
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62
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63 return (toys.optflags & FLAG_R) ? DIRTREE_RECURSE : 0;
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64 }
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65
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66 void chmod_main(void)
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67 {
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68 TT.mode = *toys.optargs;
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69 char **file;
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70
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71 for (file = toys.optargs+1; *file; file++) dirtree_read(*file, do_chmod);
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72 }