1/* groupdel.c - delete a group
2 *
3 * Copyright 2013 Ashwini Kumar <ak.ashwini1981@gmail.com>
4 * Copyright 2013 Kyungwan Han <asura321@gmail.com>
5 *
6 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/groupdel.html
7
8USE_GROUPDEL(NEWTOY(groupdel, "<1>2", TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
9USE_GROUPDEL(OLDTOY(delgroup, groupdel, TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
10
11config GROUPDEL
12  bool "groupdel"
13  default n
14  help
15    usage: groupdel [USER] GROUP
16
17    Delete a group or remove a user from a group
18*/
19
20#define FOR_groupdel
21#include "toys.h"
22
23void groupdel_main(void)
24{
25  struct group *grp = xgetgrnam(toys.optargs[toys.optc-1]);
26  char *entry = 0;
27
28  // delete user from group
29  if (toys.optc == 2) {
30    int i, len = 0, found = 0;
31    char *s;
32
33    xgetpwnam(*toys.optargs);
34    if (grp->gr_mem) for (i = 0; grp->gr_mem[i]; i++) {
35      if (!found && !strcmp(*toys.optargs, grp->gr_mem[i])) found++;
36      else len += strlen(grp->gr_mem[i]) + 1;
37    }
38    if (!found)
39      error_exit("user '%s' not in group '%s'", *toys.optargs, toys.optargs[1]);
40
41    entry = s = xmalloc(len);
42    for (i = 0; grp->gr_mem[i]; ) {
43      if (i) *(s++) = ',';
44      s = stpcpy(s, grp->gr_mem[i]);
45    }
46
47  // delete group
48  } else {
49    struct passwd *pw;
50
51    for (endpwent(); (pw = getpwent());)
52      if (pw->pw_gid == grp->gr_gid) break;
53
54    if (pw) error_exit("can't remove primary group of user '%s'", pw->pw_name);
55    if (CFG_TOYBOX_FREE) endpwent();
56  }
57
58  update_password("/etc/group", grp->gr_name, entry);
59  update_password("/etc/gshadow", grp->gr_name, entry);
60  if (CFG_TOYBOX_FREE) free(entry);
61}
62