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/* vi: set sw=4 ts=4: */
/*
* Mini chmod implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>
* to correctly parse '-rwxgoa'
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* BB_AUDIT SUSv3 compliant */
/* BB_AUDIT GNU defects - unsupported long options. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
#include "busybox.h"
#define OPT_RECURSE (option_mask32 & 1)
#define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0))
#define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))
#define OPT_QUIET (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
#define OPT_STR ("-R" USE_DESKTOP("vcf"))
/* TODO:
* chmod never changes the permissions of symbolic links; the chmod
* system call cannot change their permissions. This is not a problem
* since the permissions of symbolic links are never used.
* However, for each symbolic link listed on the command line, chmod changes
* the permissions of the pointed-to file. In contrast, chmod ignores
* symbolic links encountered during recursive directory traversals.
*/
static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
{
mode_t newmode = statbuf->st_mode;
// TODO: match GNU behavior:
// if (depth > 0 && S_ISLNK(statbuf->st_mode)) return TRUE;
// if (depth == 0) follow link
if (!bb_parse_mode((char *)junk, &newmode))
bb_error_msg_and_die("invalid mode: %s", (char *)junk);
if (chmod(fileName, statbuf->st_mode) == 0) {
if (OPT_VERBOSE /* -v verbose? or -c changed? */
|| (OPT_CHANGED && statbuf->st_mode != newmode)
) {
printf("mode of '%s' changed to %04o (%s)\n", fileName,
newmode & 07777, bb_mode_string(newmode)+1);
}
return TRUE;
}
if (!OPT_QUIET) /* not silent (-f)? */
bb_perror_msg("%s", fileName);
return FALSE;
}
int chmod_main(int argc, char **argv)
{
int retval = EXIT_SUCCESS;
char *arg, **argp;
char *smode;
/* Convert first encountered -r into a-r, -w into a-w etc */
argp = argv + 1;
while ((arg = *argp)) {
/* Mode spec must be the first arg (sans -R etc) */
/* (protect against mishandling e.g. "chmod 644 -r") */
if (arg[0] != '-')
break;
/* An option. Not a -- or valid option? */
if (arg[1] && !strchr(OPT_STR, arg[1])) {
argp[0] = xasprintf("a%s", arg);
break;
}
argp++;
}
/* "chmod -rzzz abc" will say "invalid mode: a-rzzz"!
* It is easily fixable, but deemed not worth the code */
opt_complementary = "-2";
getopt32(argc, argv, OPT_STR + 1); /* Reuse string */
argv += optind;
smode = *argv++;
/* Ok, ready to do the deed now */
do {
if (!recursive_action(*argv,
OPT_RECURSE, // recurse
FALSE, // follow links: GNU doesn't
FALSE, // depth first
fileAction, // file action
fileAction, // dir action
smode) // user data
) {
retval = EXIT_FAILURE;
}
} while (*++argv);
return retval;
}
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