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//
// chmod.c
//
// Change file permissions
//
// 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 <string.h>
#include <stdlib.h>
#include <shlib.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
struct options {
int recurse;
int verbose;
char *mode;
};
static int change_mode(char *path, struct options *opts) {
struct stat st;
int mode;
// Get existing permissions for file
if (stat(path, &st) < 0) {
perror(path);
return 1;
}
// Change permissions
mode = parse_symbolic_mode(opts->mode, st.st_mode);
if (mode == -1) {
fprintf(stderr, "%s: invalid mode\n", opts->mode);
return 1;
}
if (opts->verbose) {
char perm[11];
printf("mode of '%s' changed to %04o (%s)\n", path, mode & 07777, get_symbolic_mode(mode, perm));
}
if (chmod(path, mode) < 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 *subdir;
int rc;
dirp = opendir(path);
if (!dirp) {
perror(path);
return 1;
}
while ((dp = readdir(dirp))) {
subdir = join_path(path, dp->d_name);
if (!subdir) {
fprintf(stderr, "error: out of memory\n");
closedir(dirp);
return 1;
}
rc = change_mode(subdir, opts);
free(subdir);
if (rc != 0) {
closedir(dirp);
return 1;
}
}
closedir(dirp);
}
return 0;
}
static void usage() {
fprintf(stderr, "usage: chmod [OPTIONS] MODE FILE...\n\n");
fprintf(stderr, " -R Recursively change file permissions\n");
fprintf(stderr, " -v Print out changed file permissions\n");
exit(1);
}
shellcmd(chmod) {
struct options opts;
int c;
int i;
int rc;
// 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();
}
}
if (optind == argc) usage();
opts.mode = argv[optind++];
// Change file permissions
for (i = optind; i < argc; i++) {
rc = change_mode(argv[i], &opts);
if (rc != 0) return 1;
}
return 0;
}