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/* chgrp -- change group ownership of files
Copyright (C) 89, 90, 91, 1995 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>
#if HAVE_LIMITS_H
# include <limits.h>
#endif
#ifdef HAVE_LCHOWN
# define chown(PATH, OWNER, GROUP) lchown(PATH, OWNER, GROUP)
#endif
#ifndef UINT_MAX
# define UINT_MAX ((unsigned int) ~(unsigned int) 0)
#endif
#ifndef INT_MAX
# define INT_MAX ((int) (UINT_MAX >> 1))
#endif
#include "system.h"
#include "xstrtoul.h"
#include "error.h"
#ifndef _POSIX_VERSION
struct group *getgrnam ();
#endif
#ifndef HAVE_ENDGRENT
# define endgrent() ((void) 0)
#endif
char *group_member ();
char *savedir ();
char *xmalloc ();
char *xrealloc ();
static int change_dir_group __P ((char *dir, int group, struct stat *statp));
/* 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 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'},
{"verbose", no_argument, 0, 'v'},
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{0, 0, 0, 0}
};
/* 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 (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);
}
/* Set *G according to NAME. */
static void
parse_group (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)
{
strtol_error s_err;
unsigned long int tmp_long;
s_err = xstrtoul (name, NULL, 0, &tmp_long, NULL);
*g = tmp_long;
if (s_err == LONGINT_OVERFLOW || tmp_long > INT_MAX)
{
STRTOL_FATAL_ERROR (name, _("group number"), s_err);
}
}
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 (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))
{
errors = 1;
if (force_silent == 0)
{
/* Give a more specific message. Some systems set errno
to EPERM for both `inaccessible file' and `user not a member
of the specified group' errors. */
if (errno == EPERM && !group_member (group))
{
error (0, errno, _("you are not a member of group `%s'"),
groupname);
}
#ifdef MAXUID
else if (errno == EINVAL && group > MAXUID)
{
error (0, 0, _("%s: invalid group number"), groupname);
}
#endif
else
{
error (0, errno, "%s", file);
}
}
}
}
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 (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;
}
static 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"), program_name);
printf (_("\
Change the group membership of each FILE to GROUP.\n\
\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\
-R, --recursive change files and directories recursively\n\
--help display this help and exit\n\
--version output version information and exit\n"));
}
exit (status);
}
int
main (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 (1);
}
}
if (show_version)
{
printf ("chgrp - %s\n", PACKAGE_VERSION);
exit (0);
}
if (show_help)
usage (0);
if (argc - optind <= 1)
{
error (0, 0, _("too few arguments"));
usage (1);
}
parse_group (argv[optind++], &group);
for (; optind < argc; ++optind)
errors |= change_file_group (argv[optind], group);
exit (errors);
}
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