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/* chown -- change user and 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. */
/*
| user
| unchanged explicit
-------------|-------------------------+-------------------------|
g unchanged | --- | chown u |
r |-------------------------+-------------------------|
o explicit | chgrp g or chown .g | chown u.g |
u |-------------------------+-------------------------|
p from passwd| --- | chown u. |
|-------------------------+-------------------------|
Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <getopt.h>
#include "system.h"
#include "version.h"
#ifndef _POSIX_VERSION
struct passwd *getpwnam ();
struct group *getgrnam ();
struct group *getgrgid ();
#endif
#ifdef _POSIX_SOURCE
#define endgrent()
#define endpwent()
#endif
int lstat ();
char *savedir ();
char *parse_user_spec ();
char *xmalloc ();
char *xrealloc ();
void error ();
int isnumber ();
static int change_file_owner ();
static int change_dir_owner ();
static void describe_change ();
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 user to which ownership of the files is being given. */
static char *username;
/* 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;
{
uid_t user = -1; /* New uid; -1 if not to be changed. */
gid_t group = -1; /* New gid; -1 if not to be changed. */
int errors = 0;
int optc;
char *e;
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 '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 ();
e = parse_user_spec (argv[optind], &user, &group, &username, &groupname);
if (e)
error (1, 0, "%s: %s", argv[optind], e);
if (username == NULL)
username = "";
for (++optind; optind < argc; ++optind)
errors |= change_file_owner (argv[optind], user, group);
exit (errors);
}
/* Change the ownership of FILE to UID USER and GID GROUP.
If it is a directory and -R is given, recurse.
Return 0 if successful, 1 if errors occurred. */
static int
change_file_owner (file, user, group)
char *file;
uid_t user;
gid_t group;
{
struct stat file_stats;
uid_t newuser;
gid_t newgroup;
int errors = 0;
if (lstat (file, &file_stats))
{
if (force_silent == 0)
error (0, errno, "%s", file);
return 1;
}
newuser = user == (uid_t) -1 ? file_stats.st_uid : user;
newgroup = group == (gid_t) -1 ? file_stats.st_gid : group;
if (newuser != file_stats.st_uid || newgroup != file_stats.st_gid)
{
if (verbose)
describe_change (file, 1);
if (chown (file, newuser, newgroup))
{
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_owner (file, user, group, &file_stats);
return errors;
}
/* Recursively change the ownership of the files in directory DIR
to UID USER and GID GROUP.
STATP points to the results of lstat on DIR.
Return 0 if successful, 1 if errors occurred. */
static int
change_dir_owner (dir, user, group, statp)
char *dir;
uid_t user;
gid_t 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_owner (path, user, group);
}
free (path);
free (name_space);
return errors;
}
/* Tell the user the user and group names to which ownership of FILE
has been given; if CHANGED is zero, FILE had those owners already. */
static void
describe_change (file, changed)
char *file;
int changed;
{
if (changed)
printf ("owner of %s changed to ", file);
else
printf ("owner of %s retained as ", file);
if (groupname)
printf ("%s.%s\n", username, groupname);
else
printf ("%s\n", username);
}
static void
usage ()
{
fprintf (stderr, "\
Usage: %s [-Rcfv] [--recursive] [--changes] [--silent] [--quiet]\n\
[--verbose] [--help] [--version] [user][:.][group] file...\n",
program_name);
exit (1);
}
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