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/*
* UNG's Not GNU
*
* Copyright (c) 2011-2019, Jakob Kaivo <jkk@ung.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define _XOPEN_SOURCE 700
#include <errno.h>
#include <ftw.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <grp.h>
#include <sys/stat.h>
#include <unistd.h>
static int newgid = 0;
static int retval = 0;
static enum { UNSET, COMMANDLINE, RECURSIVE, NONE } follow = UNSET;
int chgrp(const char *p, const struct stat *st, int typeflag, struct FTW *f)
{
(void)st; (void)typeflag; (void)f;
if (chown(p, (uid_t)-1, newgid) == -1) {
fprintf(stderr, "chgrp: %s: %s\n", p, strerror(errno));
retval = 1;
}
return 0;
}
static gid_t strtogid(const char *s)
{
struct group *grp = getgrnam(s);
if (grp == NULL) {
gid_t gid = (gid_t)atoi(s);
if (gid == 0 && strcmp(s, "0")) {
fprintf(stderr, "chgrp: Couldn't find group %s\n", s);
exit(1);
}
return gid;
}
return grp->gr_gid;
}
int main(int argc, char **argv)
{
int c = 0;
int changelink = 0;
int recursive = 0;
while ((c = getopt(argc, argv, "hHLPR")) != -1) {
switch (c) {
case 'h':
changelink = 1;
break;
case 'H':
follow = COMMANDLINE;
break;
case 'L':
follow = RECURSIVE;
break;
case 'P':
follow = NONE;
break;
case 'R':
recursive = 1;
break;
default:
return 1;
}
}
if (recursive && changelink) {
fprintf(stderr, "chgrp: Options -h and -R are mutually exclusive\n");
return 1;
}
if (optind >= argc - 1) {
fprintf(stderr, "chgrp: Group and at least one file are required\n");
return 1;
}
newgid = strtogid(argv[optind++]);
while (optind < argc) {
chgrp(argv[optind++], NULL, 0, NULL);
}
return retval;
}
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