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/* chgrp -- change group ownership of files
Copyright (C) 89, 90, 91, 1995-2001 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 <sys/types.h>
#include <grp.h>
#include <getopt.h>
#include "system.h"
#include "error.h"
#include "lchown.h"
#include "group-member.h"
#include "quote.h"
#include "xstrtol.h"
#include "chown-core.h"
/* The official name of this program (e.g., no `g' prefix). */
#define PROGRAM_NAME "chgrp"
#define AUTHORS "David MacKenzie"
/* MAXUID may come from limits.h *or* sys/params.h (via system.h) above. */
#ifndef MAXUID
# define MAXUID UID_T_MAX
#endif
#ifndef MAXGID
# define MAXGID GID_T_MAX
#endif
#ifndef _POSIX_VERSION
struct group *getgrnam ();
#endif
#if ! HAVE_ENDGRENT
# define endgrent() ((void) 0)
#endif
/* The name the program was run with. */
char *program_name;
/* The argument to the --reference option. Use the group ID of this file.
This file must exist. */
static char *reference_file;
/* For long options that have no equivalent short option, use a
non-character as a pseudo short option, starting with CHAR_MAX + 1. */
enum
{
REFERENCE_FILE_OPTION = CHAR_MAX + 1,
DEREFERENCE_OPTION
};
static struct option const long_options[] =
{
{"recursive", no_argument, 0, 'R'},
{"changes", no_argument, 0, 'c'},
{"dereference", no_argument, 0, DEREFERENCE_OPTION},
{"no-dereference", no_argument, 0, 'h'},
{"quiet", no_argument, 0, 'f'},
{"silent", no_argument, 0, 'f'},
{"reference", required_argument, 0, REFERENCE_FILE_OPTION},
{"verbose", no_argument, 0, 'v'},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{0, 0, 0, 0}
};
/* Set *G according to NAME. */
static void
parse_group (const char *name, gid_t *g)
{
struct group *grp;
if (*name == '\0')
error (1, 0, _("cannot change to null group"));
grp = getgrnam (name);
if (grp == NULL)
{
strtol_error s_err;
unsigned long int tmp_long;
if (!ISDIGIT (*name))
error (1, 0, _("invalid group name %s"), quote (name));
s_err = xstrtoul (name, NULL, 0, &tmp_long, NULL);
if (s_err != LONGINT_OK)
STRTOL_FATAL_ERROR (name, _("group number"), s_err);
if (tmp_long > MAXGID)
error (1, 0, _("invalid group number %s"), quote (name));
*g = tmp_long;
}
else
*g = grp->gr_gid;
endgrent (); /* Save a file descriptor. */
}
void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("\
Usage: %s [OPTION]... GROUP FILE...\n\
or: %s [OPTION]... --reference=RFILE FILE...\n\
"),
program_name, program_name);
fputs (_("\
Change the group membership of each FILE to GROUP.\n\
\n\
-c, --changes like verbose but report only when a change is made\n\
--dereference affect the referent of each symbolic link, rather\n\
than the symbolic link itself\n\
"), stdout);
fputs (_("\
-h, --no-dereference affect symbolic links instead of any referenced file\n\
(available only on systems that can change the\n\
ownership of a symlink)\n\
"), stdout);
fputs (_("\
-f, --silent, --quiet suppress most error messages\n\
--reference=RFILE use RFILE's group rather than the specified\n\
GROUP value\n\
-R, --recursive operate on files and directories recursively\n\
-v, --verbose output a diagnostic for every file processed\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
}
exit (status);
}
int
main (int argc, char **argv)
{
gid_t gid;
int errors = 0;
int optc;
struct Chown_option chopt;
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
chopt_init (&chopt);
while ((optc = getopt_long (argc, argv, "Rcfhv", long_options, NULL)) != -1)
{
switch (optc)
{
case 0:
break;
case REFERENCE_FILE_OPTION:
reference_file = optarg;
break;
case DEREFERENCE_OPTION:
chopt.dereference = DEREF_ALWAYS;
break;
case 'R':
chopt.recurse = 1;
break;
case 'c':
chopt.verbosity = V_changes_only;
break;
case 'f':
chopt.force_silent = 1;
break;
case 'h':
chopt.dereference = DEREF_NEVER;
break;
case 'v':
chopt.verbosity = V_high;
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (1);
}
}
if (argc - optind + (reference_file ? 1 : 0) <= 1)
{
error (0, 0, _("too few arguments"));
usage (1);
}
if (reference_file)
{
struct stat ref_stats;
if (stat (reference_file, &ref_stats))
error (1, errno, _("failed to get attributes of %s"),
quote (reference_file));
chopt.group_name = gid_to_name (ref_stats.st_gid);
gid = ref_stats.st_gid;
}
else
{
chopt.group_name = argv[optind++];
parse_group (chopt.group_name, &gid);
}
for (; optind < argc; ++optind)
errors |= change_file_owner (1, argv[optind], (uid_t) -1, gid,
(uid_t) -1, (gid_t) -1, &chopt);
chopt_free (&chopt);
exit (errors);
}
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