/* 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?vRf[-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, o+s = sticky. (+t is an alias for o+s). 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; ) int do_chmod(struct dirtree *try) { mode_t mode; if (!dirtree_notdotdot(try)) return 0; mode = string_to_mode(TT.mode, try->st.st_mode); if (toys.optflags & FLAG_v) { char *s = dirtree_path(try, 0); printf("chmod '%s' to %04o\n", s, mode); free(s); } wfchmodat(dirtree_parentfd(try), try->name, mode); return (toys.optflags & FLAG_R) ? DIRTREE_RECURSE : 0; } void chmod_main(void) { TT.mode = *toys.optargs; char **file; for (file = toys.optargs+1; *file; file++) dirtree_read(*file, do_chmod); }