/* chgrp -- change group ownership of files Copyright (C) 89, 90, 91, 1995-2007 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 3, 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 . */ #include #include #include #include #include #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); emit_bug_reporting_address (); } 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); }