/* chgrp -- change group ownership of files Copyright (C) 89, 90, 91, 1995-2000 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 . */ #include #include #include #include #include #include "system.h" #include "error.h" #include "lchown.h" #include "group-member.h" #include "quote.h" #include "savedir.h" #include "xstrtol.h" /* The official name of this program (e.g., no `g' prefix). */ #define PROGRAM_NAME "chgrp" #define AUTHORS "David MacKenzie" /* MAXUID may come from limits.h *or* sys/params.h (via system.h) above. */ #ifndef MAXUID # define MAXUID UID_T_MAX #endif #ifndef MAXGID # define MAXGID GID_T_MAX #endif #ifndef _POSIX_VERSION struct group *getgrnam (); #endif #if ! HAVE_ENDGRENT # define endgrent() ((void) 0) #endif enum Change_status { CH_NOT_APPLIED, CH_SUCCEEDED, CH_FAILED, CH_NO_CHANGE_REQUESTED }; enum Verbosity { /* Print a message for each file that is processed. */ V_high, /* Print a message for each file whose attributes we change. */ V_changes_only, /* Do not be verbose. This is the default. */ V_off }; int lstat (); static int change_dir_group PARAMS ((const char *dir, gid_t group, const 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 = 1; /* When change_symlinks is set, this should be set to `lstat', otherwise, it should be `stat'. */ static int (*xstat) (); /* If nonzero, change the ownership of directories recursively. */ static int recurse; /* If nonzero, force silence (no error messages). */ static int force_silent; /* Level of verbosity. */ static enum Verbosity verbosity = V_off; /* The name of the group to which ownership of the files is being given. */ static const char *groupname; /* 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 { REFERENCE_FILE_OPTION = CHAR_MAX + 1, DEREFERENCE_OPTION }; static struct option const long_options[] = { {"recursive", no_argument, 0, 'R'}, {"changes", no_argument, 0, 'c'}, {"dereference", no_argument, 0, DEREFERENCE_OPTION}, {"no-dereference", no_argument, 0, 'h'}, {"quiet", no_argument, 0, 'f'}, {"silent", no_argument, 0, 'f'}, {"reference", required_argument, 0, REFERENCE_FILE_OPTION}, {"verbose", no_argument, 0, 'v'}, {GETOPT_HELP_OPTION_DECL}, {GETOPT_VERSION_OPTION_DECL}, {0, 0, 0, 0} }; /* Tell the user how/if the group of FILE has been changed. CHANGED describes what (if anything) has happened. */ static void describe_change (const char *file, enum Change_status changed) { const char *fmt; if (changed == CH_NOT_APPLIED) { printf (_("neither symbolic link %s nor referent has been changed\n"), quote (file)); return; } switch (changed) { case CH_SUCCEEDED: fmt = _("group of %s changed to %s\n"); break; case CH_FAILED: fmt = _("failed to change group of %s to %s\n"); break; case CH_NO_CHANGE_REQUESTED: fmt = _("group of %s retained as %s\n"); break; default: abort (); } printf (fmt, quote (file), groupname); } /* Set *G according to NAME. */ static void parse_group (const char *name, gid_t *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; if (!ISDIGIT (*name)) error (1, 0, _("invalid group name %s"), quote (name)); s_err = xstrtoul (name, NULL, 0, &tmp_long, NULL); if (s_err != LONGINT_OK) STRTOL_FATAL_ERROR (name, _("group number"), s_err); if (tmp_long > MAXGID) error (1, 0, _("invalid group number %s"), quote (name)); *g = tmp_long; } 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 (int cmdline_arg, const char *file, gid_t group) { struct stat file_stats; int errors = 0; if ((*xstat) (file, &file_stats)) { if (force_silent == 0) error (0, errno, _("getting attributes of %s"), quote (file)); return 1; } if (group != file_stats.st_gid) { int fail; int symlink_changed = 1; int saved_errno; if (S_ISLNK (file_stats.st_mode) && change_symlinks) { fail = lchown (file, (uid_t) -1, group); /* Ignore the failure if it's due to lack of support (ENOSYS) and this is not a command line argument. */ if (!cmdline_arg && fail && errno == ENOSYS) { fail = 0; symlink_changed = 0; } } else { fail = chown (file, (uid_t) -1, group); } /* Save errno, since in verbose mode, describe_change might change it. */ saved_errno = errno; if (verbosity == V_high || (verbosity == V_changes_only && !fail)) { enum Change_status ch_status = (! symlink_changed ? CH_NOT_APPLIED : (fail ? CH_FAILED : CH_SUCCEEDED)); describe_change (file, ch_status); } if (fail) { 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 (saved_errno == EPERM && !group_member (group)) { error (0, saved_errno, _("you are not a member of group %s"), quote (groupname)); } else if (saved_errno == EINVAL && group > MAXUID) { error (0, 0, _("%s: invalid group number"), quote (groupname)); } else { error (0, saved_errno, _("changing group of %s"), quote (file)); } } } } else if (verbosity == V_high) { describe_change (file, CH_NO_CHANGE_REQUESTED); } 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 (const char *dir, gid_t group, const 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; name_space = savedir (dir, statp->st_size); if (name_space == NULL) { if (force_silent == 0) error (0, errno, "%s", quote (dir)); return 1; } 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 (0, path, group); } free (path); free (name_space); return errors; } 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\ or: %s [OPTION]... --reference=RFILE FILE...\n\ "), program_name, 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\ --dereference affect the referent of each symbolic link, rather\n\ than the symbolic link itself\n\ -h, --no-dereference affect symbolic links instead of any referenced file\n\ (available only on systems that can change the\n\ ownership of a symlink)\n\ -f, --silent, --quiet suppress most error messages\n\ --reference=RFILE use RFILE's group rather than the specified\n\ GROUP value\n\ -R, --recursive operate on files and directories recursively\n\ -v, --verbose output a diagnostic for every file processed\n\ --help display this help and exit\n\ --version output version information and exit\n\ ")); puts (_("\nReport bugs to .")); } exit (status); } int main (int argc, char **argv) { gid_t group; int errors = 0; int optc; program_name = argv[0]; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); atexit (close_stdout); recurse = force_silent = 0; while ((optc = getopt_long (argc, argv, "Rcfhv", long_options, NULL)) != -1) { switch (optc) { case 0: break; case REFERENCE_FILE_OPTION: reference_file = optarg; break; case DEREFERENCE_OPTION: change_symlinks = 0; break; case 'R': recurse = 1; break; case 'c': verbosity = V_changes_only; break; case 'f': force_silent = 1; break; case 'h': change_symlinks = 1; break; case 'v': verbosity = V_high; break; case_GETOPT_HELP_CHAR; case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); default: usage (1); } } if (argc - optind + (reference_file ? 1 : 0) <= 1) { error (0, 0, _("too few arguments")); usage (1); } if (change_symlinks) xstat = lstat; else xstat = stat; if (reference_file) { struct stat ref_stats; if (stat (reference_file, &ref_stats)) error (1, errno, _("getting attributes of %s"), quote (reference_file)); group = ref_stats.st_gid; } else parse_group (argv[optind++], &group); for (; optind < argc; ++optind) errors |= change_file_group (1, argv[optind], group); exit (errors); }