Goto sanos source index
//
// chgrp.c
//
// Change file group ownership
//
// Copyright (C) 2012 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <shlib.h>
#include <unistd.h>
#include <dirent.h>
#include <grp.h>
#include <sys/stat.h>
struct options {
int recurse;
int verbose;
char *group;
int gid;
};
static int change_group_owner(char *path, struct options *opts) {
struct stat st;
// Get existing ownership for file
if (stat(path, &st) < 0) {
perror(path);
return 1;
}
// Change ownership
if (opts->verbose) {
if (opts->gid != st.st_gid) {
printf("group owner of '%s' changed to %s\n", path, opts->group);
} else {
printf("group ownership of '%s' retained as %s\n", path, opts->group);
}
}
if (chown(path, -1, opts->gid) < 0) {
perror(path);
return 1;
}
// Recurse into sub-directories if requested
if (opts->recurse && S_ISDIR(st.st_mode)) {
struct dirent *dp;
DIR *dirp;
char *fn;
int rc;
dirp = opendir(path);
if (!dirp) {
perror(path);
return 1;
}
while ((dp = readdir(dirp))) {
fn = join_path(path, dp->d_name);
if (!fn) {
fprintf(stderr, "error: out of memory\n");
closedir(dirp);
return 1;
}
rc = change_group_owner(fn, opts);
free(fn);
if (rc != 0) {
closedir(dirp);
return 1;
}
}
closedir(dirp);
}
return 0;
}
static void usage() {
fprintf(stderr, "usage: chgrp [OPTIONS] GROUP FILE...\n\n");
fprintf(stderr, " -R Recursively change file group ownership\n");
fprintf(stderr, " -v Print out changed file group ownership\n");
exit(1);
}
shellcmd(chgrp) {
struct options opts;
int c;
int i;
int rc;
struct group *grp;
// Parse command line options
memset(&opts, 0, sizeof(struct options));
while ((c = getopt(argc, argv, "Rv?")) != EOF) {
switch (c) {
case 'R':
opts.recurse = 1;
break;
case 'v':
opts.verbose = 1;
break;
case '?':
default:
usage();
}
}
// Get group
if (optind == argc) usage();
opts.group = argv[optind++];
grp = getgrnam(opts.group);
if (!grp) {
fprintf(stderr, "%s: unknown group\n", opts.group);
return 1;
}
opts.gid = grp->gr_gid;
// Change file group ownership
for (i = optind; i < argc; i++) {
rc = change_group_owner(argv[i], &opts);
if (rc != 0) return 1;
}
return 0;
}