LXR toybox/toys/pending/groupdel.c

   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