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- /* chmod.c - Change file mode bits
- *
- * Copyright 2012 Rob Landley <rob@landley.net>
- *
- * See http://opengroup.org/onlinepubs/9699919799/utilities/chmod.html
- USE_CHMOD(NEWTOY(chmod, "<2?vfR[-vf]", TOYFLAG_BIN))
- config CHMOD
- bool "chmod"
- default y
- help
- usage: chmod [-R] MODE FILE...
- Change mode of listed file[s] (recursively with -R).
- MODE can be (comma-separated) stanzas: [ugoa][+-=][rwxstXugo]
- Stanzas are applied in order: For each category (u = user,
- g = group, o = other, a = all three, if none specified default is a),
- set (+), clear (-), or copy (=), r = read, w = write, x = execute.
- s = u+s = suid, g+s = sgid, +t = sticky. (o+s ignored so a+s doesn't set +t)
- suid/sgid: execute as the user/group who owns the file.
- sticky: can't delete files you don't own out of this directory
- X = x for directories or if any category already has x set.
- Or MODE can be an octal value up to 7777 ug uuugggooo top +
- bit 1 = o+x, bit 1<<8 = u+w, 1<<11 = g+1 sstrwxrwxrwx bottom
- Examples:
- chmod u+w file - allow owner of "file" to write to it.
- chmod 744 file - user can read/write/execute, everyone else read only
- */
- #define FOR_chmod
- #include "toys.h"
- GLOBALS(
- char *mode;
- )
- static int do_chmod(struct dirtree *try)
- {
- mode_t mode;
- if (!dirtree_notdotdot(try)) return 0;
- if (FLAG(R) && try->parent && S_ISLNK(try->st.st_mode)) {
- // Ignore symlinks found during recursion. We'll only try to modify
- // symlinks mentioned directly as arguments. We'll fail, of course,
- // but that's what you asked for in that case.
- } else {
- mode = string_to_mode(TT.mode, try->st.st_mode) & ~S_IFMT;
- if (FLAG(v)) {
- char *s = dirtree_path(try, 0);
- printf("chmod '%s' to %s\n", s, TT.mode);
- free(s);
- }
- wfchmodat(dirtree_parentfd(try), try->name, mode);
- }
- return FLAG(R)*DIRTREE_RECURSE;
- }
- void chmod_main(void)
- {
- TT.mode = *toys.optargs;
- char **file;
- for (file = toys.optargs+1; *file; file++) dirtree_read(*file, do_chmod);
- }
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