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/* chmod -- change permission modes of files
Copyright (C) 89, 90, 91, 95, 96, 1997 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by David MacKenzie <djm@gnu.ai.mit.edu> */
#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "modechange.h"
#include "system.h"
#include "error.h"
#include "savedir.h"
enum Change_status
{
CH_SUCCEEDED,
CH_FAILED,
CH_NO_CHANGE_REQUESTED
};
void mode_string ();
void strip_trailing_slashes ();
char *xmalloc ();
char *xrealloc ();
static int change_dir_mode __P ((const char *dir,
const struct mode_change *changes,
const struct stat *statp));
/* The name the program was run with. */
char *program_name;
/* If nonzero, change the modes of directories recursively. */
static int recurse;
/* If nonzero, force silence (no error messages). */
static int force_silent;
/* If nonzero, describe the modes we set. */
static int verbose;
/* The argument to the --reference option. Use the owner and group IDs
of this file. This file must exist. */
static char *reference_file;
/* If nonzero, describe only modes that change. */
static int changes_only;
/* If nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, print the version on standard output and exit. */
static int show_version;
static struct option const long_options[] =
{
{"recursive", no_argument, 0, 'R'},
{"changes", no_argument, 0, 'c'},
{"silent", no_argument, 0, 'f'},
{"quiet", no_argument, 0, 'f'},
{"reference", required_argument, 0, 12},
{"verbose", no_argument, 0, 'v'},
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{0, 0, 0, 0}
};
/* Tell the user how/if the MODE of FILE has been changed.
CHANGED describes what (if anything) has happened. */
static void
describe_change (const char *file, short unsigned int mode,
enum Change_status changed)
{
char perms[11]; /* "-rwxrwxrwx" ls-style modes. */
const char *fmt;
mode_string (mode, perms);
perms[10] = '\0'; /* `mode_string' does not null terminate. */
switch (changed)
{
case CH_SUCCEEDED:
fmt = _("mode of %s changed to %04o (%s)\n");
break;
case CH_FAILED:
fmt = _("failed to change mode of %s to %04o (%s)\n");
break;
case CH_NO_CHANGE_REQUESTED:
fmt = _("mode of %s retained as %04o (%s)\n");
break;
default:
abort ();
}
printf (fmt, file, mode & 07777, &perms[1]);
}
/* Change the mode of FILE according to the list of operations CHANGES.
If DEREF_SYMLINK is nonzero and FILE is a symbolic link, change the
mode of the referenced file. If DEREF_SYMLINK is zero, ignore symbolic
links. Return 0 if successful, 1 if errors occurred. */
static int
change_file_mode (const char *file, const struct mode_change *changes,
const int deref_symlink)
{
struct stat file_stats;
unsigned short newmode;
int errors = 0;
if (lstat (file, &file_stats))
{
if (force_silent == 0)
error (0, errno, "%s", file);
return 1;
}
#ifdef S_ISLNK
if (S_ISLNK (file_stats.st_mode))
{
if (! deref_symlink)
return 0;
else
if (stat (file, &file_stats))
{
if (force_silent == 0)
error (0, errno, "%s", file);
return 1;
}
}
#endif
newmode = mode_adjust (file_stats.st_mode, changes);
if (newmode != (file_stats.st_mode & 07777))
{
int fail = chmod (file, (int) newmode);
if (verbose || (changes_only && !fail))
describe_change (file, newmode, (fail ? CH_FAILED : CH_SUCCEEDED));
if (fail)
{
if (force_silent == 0)
error (0, errno, "%s", file);
errors = 1;
}
}
else if (verbose && changes_only == 0)
describe_change (file, newmode, CH_NO_CHANGE_REQUESTED);
if (recurse && S_ISDIR (file_stats.st_mode))
errors |= change_dir_mode (file, changes, &file_stats);
return errors;
}
/* Recursively change the modes of the files in directory DIR
according to the list of operations CHANGES.
STATP points to the results of lstat on DIR.
Return 0 if successful, 1 if errors occurred. */
static int
change_dir_mode (const char *dir, const struct mode_change *changes,
const struct stat *statp)
{
char *name_space, *namep;
char *path; /* Full path of each entry to process. */
unsigned dirlength; /* Length of DIR and '\0'. */
unsigned filelength; /* Length of each pathname to process. */
unsigned pathlength; /* Bytes allocated for `path'. */
int errors = 0;
errno = 0;
name_space = savedir (dir, statp->st_size);
if (name_space == NULL)
{
if (errno)
{
if (force_silent == 0)
error (0, errno, "%s", dir);
return 1;
}
else
error (1, 0, _("virtual memory exhausted"));
}
dirlength = strlen (dir) + 1; /* + 1 is for the trailing '/'. */
pathlength = dirlength + 1;
/* Give `path' a dummy value; it will be reallocated before first use. */
path = xmalloc (pathlength);
strcpy (path, dir);
path[dirlength - 1] = '/';
for (namep = name_space; *namep; namep += filelength - dirlength)
{
filelength = dirlength + strlen (namep) + 1;
if (filelength > pathlength)
{
pathlength = filelength * 2;
path = xrealloc (path, pathlength);
}
strcpy (path + dirlength, namep);
errors |= change_file_mode (path, changes, 0);
}
free (path);
free (name_space);
return errors;
}
static void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("\
Usage: %s [OPTION]... MODE[,MODE]... FILE...\n\
or: %s [OPTION]... OCTAL_MODE FILE...\n\
or: %s [OPTION]... --reference=RFILE FILE...\n\
"),
program_name, program_name, program_name);
printf (_("\
\n\
-c, --changes like verbose but report only when a change is made\n\
-f, --silent, --quiet suppress most error messages\n\
-v, --verbose output a diagnostic for every file processed\n\
--reference=RFILE use RFILE's mode instead of MODE values\n\
-R, --recursive change files and directories recursively\n\
--help display this help and exit\n\
--version output version information and exit\n\
\n\
Each MODE is one or more of the letters ugoa, one of the symbols +-= and\n\
one or more of the letters rwxXstugo.\n\
"));
puts (_("\nReport bugs to <fileutils-bugs@gnu.org>."));
}
exit (status);
}
/* Parse the ASCII mode given on the command line into a linked list
of `struct mode_change' and apply that to each file argument. */
int
main (int argc, char **argv)
{
struct mode_change *changes;
int errors = 0;
int modeind = 0; /* Index of the mode argument in `argv'. */
int thisind;
int c;
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
recurse = force_silent = verbose = changes_only = 0;
while (1)
{
thisind = optind ? optind : 1;
c = getopt_long (argc, argv, "RcfvrwxXstugoa,+-=", long_options, NULL);
if (c == -1)
break;
switch (c)
{
case 0:
break;
case 'r':
case 'w':
case 'x':
case 'X':
case 's':
case 't':
case 'u':
case 'g':
case 'o':
case 'a':
case ',':
case '+':
case '-':
case '=':
if (modeind != 0 && modeind != thisind)
error (1, 0, _("invalid mode"));
modeind = thisind;
break;
case 12:
reference_file = optarg;
break;
case 'R':
recurse = 1;
break;
case 'c':
changes_only = 1;
break;
case 'f':
force_silent = 1;
break;
case 'v':
verbose = 1;
break;
default:
usage (1);
}
}
if (show_version)
{
printf ("chmod (%s) %s\n", GNU_PACKAGE, VERSION);
exit (0);
}
if (show_help)
usage (0);
if (modeind == 0 && reference_file == NULL)
modeind = optind++;
if (optind >= argc)
{
error (0, 0, _("too few arguments"));
usage (1);
}
changes = (reference_file ? mode_create_from_ref (reference_file)
: mode_compile (argv[modeind], MODE_MASK_ALL));
if (changes == MODE_INVALID)
error (1, 0, _("invalid mode"));
else if (changes == MODE_MEMORY_EXHAUSTED)
error (1, 0, _("virtual memory exhausted"));
else if (changes == MODE_BAD_REFERENCE)
error (1, errno, "%s", reference_file);
for (; optind < argc; ++optind)
{
strip_trailing_slashes (argv[optind]);
errors |= change_file_mode (argv[optind], changes, 1);
}
exit (errors);
}
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