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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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