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- /* chgrp -- change group ownership of files
- Copyright (C) 1989, 1990, 1991 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
-
- #include <stdio.h>
- #include <ctype.h>
- #include <sys/types.h>
- #include <grp.h>
- #include <getopt.h>
- #include "system.h"
-
- #ifndef _POSIX_VERSION
- struct group *getgrnam ();
- #endif
-
- #ifdef _POSIX_SOURCE
- #define endgrent()
- #endif
-
- int lstat ();
-
- char *savedir ();
- char *xmalloc ();
- char *xrealloc ();
- int change_file_group ();
- int change_dir_group ();
- int isnumber ();
- void describe_change ();
- void error ();
- void parse_group ();
- void usage ();
-
- /* The name the program was run with. */
- char *program_name;
-
- /* If nonzero, change the ownership of directories recursively. */
- int recurse;
-
- /* If nonzero, force silence (no error messages). */
- int force_silent;
-
- /* If nonzero, describe the files we process. */
- int verbose;
-
- /* If nonzero, describe only owners or groups that change. */
- int changes_only;
-
- /* The name of the group to which ownership of the files is being given. */
- char *groupname;
-
- struct option long_options[] =
- {
- {"recursive", 0, 0, 'R'},
- {"changes", 0, 0, 'c'},
- {"silent", 0, 0, 'f'},
- {"quiet", 0, 0, 'f'},
- {"verbose", 0, 0, 'v'},
- {0, 0, 0, 0}
- };
-
- void
- main (argc, argv)
- 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, "Rcfv", long_options, (int *) 0))
- != EOF)
- {
- switch (optc)
- {
- case 'R':
- recurse = 1;
- break;
- case 'c':
- verbose = 1;
- changes_only = 1;
- break;
- case 'f':
- force_silent = 1;
- break;
- case 'v':
- verbose = 1;
- break;
- default:
- usage ();
- }
- }
-
- if (optind >= argc - 1)
- usage ();
-
- parse_group (argv[optind++], &group);
-
- for (; optind < argc; ++optind)
- errors |= change_file_group (argv[optind], group);
-
- exit (errors);
- }
-
- /* Set *G according to NAME. */
-
- void
- parse_group (name, g)
- 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)
- {
- if (!isnumber (name))
- error (1, 0, "invalid group `%s'", name);
- *g = atoi (name);
- }
- 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. */
-
- int
- change_file_group (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)
- {
- if (verbose)
- describe_change (file, 1);
- if (chown (file, file_stats.st_uid, group))
- {
- 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_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. */
-
- int
- change_dir_group (dir, group, statp)
- 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;
- }
-
- /* Tell the user the group name to which ownership of FILE
- has been given; if CHANGED is zero, FILE was that group already. */
-
- void
- describe_change (file, changed)
- 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);
- }
-
- /* Return nonzero if STR represents an unsigned decimal integer,
- otherwise return 0. */
-
- int
- isnumber (str)
- char *str;
- {
- for (; *str; str++)
- if (!isdigit (*str))
- return 0;
- return 1;
- }
-
- void
- usage ()
- {
- fprintf (stderr, "\
- Usage: %s [-Rcfv] [--recursive] [--changes] [--silent] [--quiet]\n\
- [--verbose] group file...\n",
- program_name);
- exit (1);
- }
-