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DEFINITIONS
This source file includes following definitions.
- parse_group
- usage
- main
/* chgrp -- change group ownership of files
Copyright (C) 89, 90, 91, 1995-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 "chown-core.h"
#include "error.h"
#include "fts_.h"
#include "group-member.h"
#include "quote.h"
#include "root-dev-ino.h"
#include "xstrtol.h"
/* The official name of this program (e.g., no `g' prefix). */
#define PROGRAM_NAME "chgrp"
#define AUTHORS "David MacKenzie", "Jim Meyering"
#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
{
DEREFERENCE_OPTION = CHAR_MAX + 1,
NO_PRESERVE_ROOT,
PRESERVE_ROOT,
REFERENCE_FILE_OPTION
};
static struct option const long_options[] =
{
{"recursive", no_argument, NULL, 'R'},
{"changes", no_argument, NULL, 'c'},
{"dereference", no_argument, NULL, DEREFERENCE_OPTION},
{"no-dereference", no_argument, NULL, 'h'},
{"no-preserve-root", no_argument, NULL, NO_PRESERVE_ROOT},
{"preserve-root", no_argument, NULL, PRESERVE_ROOT},
{"quiet", no_argument, NULL, 'f'},
{"silent", no_argument, NULL, 'f'},
{"reference", required_argument, NULL, REFERENCE_FILE_OPTION},
{"verbose", no_argument, NULL, 'v'},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
/* Return the group ID of NAME, or -1 if no name was specified. */
static gid_t
parse_group (const char *name)
{
gid_t gid = -1;
if (*name)
{
struct group *grp = getgrnam (name);
if (grp)
gid = grp->gr_gid;
else
{
unsigned long int tmp;
if (! (xstrtoul (name, NULL, 10, &tmp, "") == LONGINT_OK
&& tmp <= GID_T_MAX))
error (EXIT_FAILURE, 0, _("invalid group %s"), quote (name));
gid = tmp;
}
endgrent (); /* Save a file descriptor. */
}
return gid;
}
void
usage (int status)
{
if (status != EXIT_SUCCESS)
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 of each FILE to GROUP.\n\
With --reference, change the group of each FILE to that of RFILE.\n\
\n\
-c, --changes like verbose but report only when a change is made\n\
--dereference affect the referent of each symbolic link (this is\n\
the default), rather than the symbolic link itself\n\
"), stdout);
fputs (_("\
-h, --no-dereference affect each symbolic link instead of any referenced\n\
file (useful only on systems that can change the\n\
ownership of a symlink)\n\
"), stdout);
fputs (_("\
--no-preserve-root do not treat `/' specially (the default)\n\
--preserve-root fail to operate recursively on `/'\n\
"), stdout);
fputs (_("\
-f, --silent, --quiet suppress most error messages\n\
--reference=RFILE use RFILE's group rather than specifying a\n\
GROUP value\n\
-R, --recursive operate on files and directories recursively\n\
-v, --verbose output a diagnostic for every file processed\n\
\n\
"), stdout);
fputs (_("\
The following options modify how a hierarchy is traversed when the -R\n\
option is also specified. If more than one is specified, only the final\n\
one takes effect.\n\
\n\
-H if a command line argument is a symbolic link\n\
to a directory, traverse it\n\
-L traverse every symbolic link to a directory\n\
encountered\n\
-P do not traverse any symbolic links (default)\n\
\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
printf (_("\
\n\
Examples:\n\
%s staff /u Change the group of /u to \"staff\".\n\
%s -hR staff /u Change the group of /u and subfiles to \"staff\".\n\
"),
program_name, program_name);
printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
}
exit (status);
}
int
main (int argc, char **argv)
{
bool preserve_root = false;
gid_t gid;
/* Bit flags that control how fts works. */
int bit_flags = FTS_PHYSICAL;
/* 1 if --dereference, 0 if --no-dereference, -1 if neither has been
specified. */
int dereference = -1;
struct Chown_option chopt;
bool ok;
int optc;
initialize_main (&argc, &argv);
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
chopt_init (&chopt);
while ((optc = getopt_long (argc, argv, "HLPRcfhv", long_options, NULL))
!= -1)
{
switch (optc)
{
case 'H': /* Traverse command-line symlinks-to-directories. */
bit_flags = FTS_COMFOLLOW | FTS_PHYSICAL;
break;
case 'L': /* Traverse all symlinks-to-directories. */
bit_flags = FTS_LOGICAL;
break;
case 'P': /* Traverse no symlinks-to-directories. */
bit_flags = FTS_PHYSICAL;
break;
case 'h': /* --no-dereference: affect symlinks */
dereference = 0;
break;
case DEREFERENCE_OPTION: /* --dereference: affect the referent
of each symlink */
dereference = 1;
break;
case NO_PRESERVE_ROOT:
preserve_root = false;
break;
case PRESERVE_ROOT:
preserve_root = true;
break;
case REFERENCE_FILE_OPTION:
reference_file = optarg;
break;
case 'R':
chopt.recurse = true;
break;
case 'c':
chopt.verbosity = V_changes_only;
break;
case 'f':
chopt.force_silent = true;
break;
case 'v':
chopt.verbosity = V_high;
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (EXIT_FAILURE);
}
}
if (chopt.recurse)
{
if (bit_flags == FTS_PHYSICAL)
{
if (dereference == 1)
error (EXIT_FAILURE, 0,
_("-R --dereference requires either -H or -L"));
dereference = 0;
}
}
else
{
bit_flags = FTS_PHYSICAL;
}
chopt.affect_symlink_referent = (dereference != 0);
if (argc - optind < (reference_file ? 1 : 2))
{
if (argc <= optind)
error (0, 0, _("missing operand"));
else
error (0, 0, _("missing operand after %s"), quote (argv[argc - 1]));
usage (EXIT_FAILURE);
}
if (reference_file)
{
struct stat ref_stats;
if (stat (reference_file, &ref_stats))
error (EXIT_FAILURE, errno, _("failed to get attributes of %s"),
quote (reference_file));
gid = ref_stats.st_gid;
chopt.group_name = gid_to_name (ref_stats.st_gid);
}
else
{
char *group_name = argv[optind++];
chopt.group_name = (*group_name ? group_name : NULL);
gid = parse_group (group_name);
}
if (chopt.recurse & preserve_root)
{
static struct dev_ino dev_ino_buf;
chopt.root_dev_ino = get_root_dev_ino (&dev_ino_buf);
if (chopt.root_dev_ino == NULL)
error (EXIT_FAILURE, errno, _("failed to get attributes of %s"),
quote ("/"));
}
ok = chown_files (argv + optind, bit_flags,
(uid_t) -1, gid,
(uid_t) -1, (gid_t) -1, &chopt);
chopt_free (&chopt);
exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);
}