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/* chgrp -- change group ownership of files
Copyright (C) 1989, 1990, 1991 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <grp.h>
#include <getopt.h>
#include "system.h"
#include "version.h"
#if !defined (isascii) || defined (STDC_HEADERS)
#undef isascii
#define isascii(c) 1
#endif
#define ISDIGIT(c) (isascii (c) && isdigit (c))
#ifndef _POSIX_VERSION
struct group *getgrnam ();
#endif
#ifdef _POSIX_SOURCE
#define endgrent()
#endif
int lstat ();
char *savedir ();
char *xmalloc ();
char *xrealloc ();
void error ();
static int change_file_group ();
static int change_dir_group ();
static int isnumber ();
static void describe_change ();
static void parse_group ();
static void usage ();
/* The name the program was run with. */
char *program_name;
/* If nonzero, change the ownership of directories recursively. */
static int recurse;
/* If nonzero, force silence (no error messages). */
static int force_silent;
/* If nonzero, describe the files we process. */
static int verbose;
/* If nonzero, describe only owners or groups that change. */
static int changes_only;
/* The name of the group to which ownership of the files is being given. */
static char *groupname;
/* If non-zero, display usage information and exit. */
static int flag_help;
/* If non-zero, print the version on standard error. */
static int flag_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'},
{"verbose", no_argument, 0, 'v'},
{"help", no_argument, &flag_help, 1},
{"version", no_argument, &flag_version, 1},
{0, 0, 0, 0}
};
void
main (argc, argv)
int argc;
char **argv;
{
int group;
int errors = 0;
int optc;
program_name = argv[0];
recurse = force_silent = verbose = changes_only = 0;
while ((optc = getopt_long (argc, argv, "Rcfv", long_options, (int *) 0))
!= EOF)
{
switch (optc)
{
case 0:
break;
case 'R':
recurse = 1;
break;
case 'c':
verbose = 1;
changes_only = 1;
break;
case 'f':
force_silent = 1;
break;
case 'v':
verbose = 1;
break;
default:
usage ();
}
}
if (flag_version)
fprintf (stderr, "%s\n", version_string);
if (flag_help)
usage ();
if (optind >= argc - 1)
usage ();
parse_group (argv[optind++], &group);
for (; optind < argc; ++optind)
errors |= change_file_group (argv[optind], group);
exit (errors);
}
/* Set *G according to NAME. */
static void
parse_group (name, g)
char *name;
int *g;
{
struct group *grp;
groupname = name;
if (*name == '\0')
error (1, 0, "can not change to null group");
grp = getgrnam (name);
if (grp == NULL)
{
if (!isnumber (name))
error (1, 0, "invalid group `%s'", name);
*g = atoi (name);
}
else
*g = grp->gr_gid;
endgrent (); /* Save a file descriptor. */
}
/* Change the ownership of FILE to GID GROUP.
If it is a directory and -R is given, recurse.
Return 0 if successful, 1 if errors occurred. */
static int
change_file_group (file, group)
char *file;
int group;
{
struct stat file_stats;
int errors = 0;
if (lstat (file, &file_stats))
{
if (force_silent == 0)
error (0, errno, "%s", file);
return 1;
}
if (group != file_stats.st_gid)
{
if (verbose)
describe_change (file, 1);
if (chown (file, file_stats.st_uid, group))
{
if (force_silent == 0)
error (0, errno, "%s", file);
errors = 1;
}
}
else if (verbose && changes_only == 0)
describe_change (file, 0);
if (recurse && S_ISDIR (file_stats.st_mode))
errors |= change_dir_group (file, group, &file_stats);
return errors;
}
/* Recursively change the ownership of the files in directory DIR
to GID GROUP.
STATP points to the results of lstat on DIR.
Return 0 if successful, 1 if errors occurred. */
static int
change_dir_group (dir, group, statp)
char *dir;
int group;
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_group (path, group);
}
free (path);
free (name_space);
return errors;
}
/* Tell the user the group name to which ownership of FILE
has been given; if CHANGED is zero, FILE was that group already. */
static void
describe_change (file, changed)
char *file;
int changed;
{
if (changed)
printf ("group of %s changed to %s\n", file, groupname);
else
printf ("group of %s retained as %s\n", file, groupname);
}
/* Return nonzero if STR represents an unsigned decimal integer,
otherwise return 0. */
static int
isnumber (str)
char *str;
{
for (; *str; str++)
if (!ISDIGIT (*str))
return 0;
return 1;
}
static void
usage ()
{
fprintf (stderr, "\
Usage: %s [-Rcfv] [--recursive] [--changes] [--silent] [--quiet]\n\
[--verbose] [--help] [--version] group file...\n",
program_name);
exit (1);
}
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