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- /* chown -- change user and group ownership of files
- Copyright (C) 89, 90, 91, 95, 1996 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. */
-
- /*
- | 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 <config.h>
- #include <stdio.h>
- #include <sys/types.h>
- #include <pwd.h>
- #include <grp.h>
- #include <getopt.h>
-
- #include "system.h"
- #include "error.h"
-
- #ifndef _POSIX_VERSION
- struct passwd *getpwnam ();
- struct group *getgrnam ();
- struct group *getgrgid ();
- #endif
-
- #ifndef HAVE_ENDPWENT
- # define endpwent() ((void) 0)
- #endif
-
- #ifdef HAVE_LCHOWN
- # define LCHOWN(FILE, OWNER, GROUP) lchown (FILE, OWNER, GROUP)
- #else
- # define LCHOWN(FILE, OWNER, GROUP) 1
- #endif
-
- char *savedir ();
- char *parse_user_spec ();
- void strip_trailing_slashes ();
- char *xmalloc ();
- char *xrealloc ();
-
- static int change_dir_owner __P ((char *dir, uid_t user, gid_t group,
- struct stat *statp));
-
- /* The name the program was run with. */
- char *program_name;
-
- /* If nonzero, and the systems has support for it, change the ownership
- of symbolic links rather than any files they point to. */
- static int change_symlinks;
-
- /* 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 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'},
- {"no-dereference", no_argument, 0, 'h'},
- {"quiet", no_argument, 0, 'f'},
- {"silent", 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 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 (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);
- }
-
- /* 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 (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)
- {
- int fail;
-
- if (verbose)
- describe_change (file, 1);
-
- if (change_symlinks)
- fail = LCHOWN (file, newuser, newgroup);
- else
- fail = chown (file, newuser, newgroup);
-
- if (fail)
- {
- 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 (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;
- }
-
- static void
- usage (int status)
- {
- if (status != 0)
- fprintf (stderr, _("Try `%s --help' for more information.\n"),
- program_name);
- else
- {
- printf (_("\
- Usage: %s [OPTION]... OWNER[.[GROUP]] FILE...\n\
- or: %s [OPTION]... .[GROUP] FILE...\n\
- "),
- program_name, program_name);
- printf (_("\
- Change the owner and/or group of each FILE to OWNER and/or GROUP.\n\
- \n\
- -c, --changes be verbose whenever change occurs\n\
- -h, --no-dereference affect symbolic links instead of any referenced file\n\
- (available only on systems with lchown system call)\n\
- -f, --silent, --quiet suppress most error messages\n\
- -v, --verbose explain what is being done\n\
- -R, --recursive change files and directories recursively\n\
- --help display this help and exit\n\
- --version output version information and exit\n\
- \n\
- Owner is unchanged if missing. Group is unchanged if missing, but changed\n\
- to login group if implied by a period. A colon may replace the period.\n"));
- }
- exit (status);
- }
-
- int
- main (int argc, char **argv)
- {
- uid_t user = (uid_t) -1; /* New uid; -1 if not to be changed. */
- gid_t group = (uid_t) -1; /* New gid; -1 if not to be changed. */
- int errors = 0;
- int optc;
- char *e;
-
- program_name = argv[0];
- setlocale (LC_ALL, "");
- bindtextdomain (PACKAGE, LOCALEDIR);
- textdomain (PACKAGE);
-
- recurse = force_silent = verbose = changes_only = 0;
-
- while ((optc = getopt_long (argc, argv, "Rcfhv", 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 'h':
- change_symlinks = 1;
- break;
- case 'v':
- verbose = 1;
- break;
- default:
- usage (1);
- }
- }
-
- if (show_version)
- {
- printf ("chown - %s\n", PACKAGE_VERSION);
- exit (0);
- }
-
- if (show_help)
- usage (0);
-
- if (optind >= argc - 1)
- {
- error (0, 0, _("too few arguments"));
- usage (1);
- }
-
- #ifndef HAVE_LCHOWN
- if (change_symlinks)
- {
- error (1, 0, _("--no-dereference (-h) is not supported on this system"));
- }
- #endif
-
- 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)
- {
- strip_trailing_slashes (argv[optind]);
- errors |= change_file_owner (argv[optind], user, group);
- }
-
- exit (errors);
- }
-