/* chgrp -- change 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. */ /* Written by David MacKenzie . */ #include #include #include #include #include #if HAVE_LIMITS_H # include #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" /* MAXUID may come from limits.h *or* sys/params.h (via system.h) above. */ #ifndef MAXUID # define MAXUID INT_MAX #endif #ifndef _POSIX_VERSION struct group *getgrnam (); #endif #ifndef HAVE_ENDGRENT # define endgrent() ((void) 0) #endif #ifdef HAVE_LCHOWN # define LCHOWN(FILE, OWNER, GROUP) lchown (FILE, OWNER, GROUP) #else # define LCHOWN(FILE, OWNER, GROUP) 1 #endif char *group_member (); char *savedir (); char *xmalloc (); char *xrealloc (); static int change_dir_group __P ((const char *dir, int 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; /* 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 const 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'}, {"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 (const 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 (const 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; if (!ISDIGIT (*name)) error (1, 0, _("invalid group name `%s'"), 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 > INT_MAX) error (1, 0, _("invalid group number `%s'"), 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 (const 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) { int fail; if (verbose) describe_change (file, 1); if (change_symlinks) fail = LCHOWN (file, file_stats.st_uid, group); else fail = chown (file, file_stats.st_uid, group); 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 (errno == EPERM && !group_member (group)) { error (0, errno, _("you are not a member of group `%s'"), groupname); } else if (errno == EINVAL && group > MAXUID) { error (0, 0, _("%s: invalid group number"), groupname); } 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 (const char *dir, int 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; 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\ -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 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\ ")); puts (_("\nReport bugs to bug-gnu-utils@gnu.ai.mit.edu")); } exit (status); } int main (int argc, char **argv) { int group; int errors = 0; int optc; 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 ("chgrp (%s) %s\n", GNU_PACKAGE, VERSION); exit (0); } if (show_help) usage (0); if (argc - optind <= 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 parse_group (argv[optind++], &group); for (; optind < argc; ++optind) errors |= change_file_group (argv[optind], group); exit (errors); }