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- /* 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 <djm@gnu.ai.mit.edu>. */
-
- #include <config.h>
- #include <stdio.h>
- #include <sys/types.h>
- #include <grp.h>
- #include <getopt.h>
-
- #if HAVE_LIMITS_H
- # include <limits.h>
- #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 ((char *dir, int 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 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'},
- {"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 (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 (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;
-
- s_err = xstrtoul (name, NULL, 0, &tmp_long, NULL);
- *g = tmp_long;
- if (s_err == LONGINT_OVERFLOW || tmp_long > INT_MAX)
- {
- STRTOL_FATAL_ERROR (name, _("group number"), s_err);
- }
- }
- 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 (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 (char *dir, int 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_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"));
- }
- exit (status);
- }
-
- int
- main (int argc, char **argv)
- {
- int group;
- int errors = 0;
- int optc;
-
- program_name = argv[0];
- recurse = force_silent = verbose = changes_only = 0;
-
- while ((optc = getopt_long (argc, argv, "Rcfnv", 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\n", 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);
- }
-