5819 want dumpadm(1m) option to print estimated dump size

*** 18,27 ****
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
+  * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
   */
  
  #include <sys/stat.h>
  #include <locale.h>
  #include <unistd.h>
*** 32,45 ****
  #include "dconf.h"
  #include "minfree.h"
  #include "utils.h"
  
  static const char USAGE[] = "\
! Usage: %s [-nuy] [-c kernel | curproc | all ] [-d dump-device | swap ]\n\
          [-m min {k|m|%%} ] [-s savecore-dir] [-r root-dir] [-z on|off]\n";
  
! static const char OPTS[] = "inuyc:d:m:s:r:z:";
  
  static const char PATH_DEVICE[] = "/dev/dump";
  static const char PATH_CONFIG[] = "/etc/dumpadm.conf";
  
  int
--- 33,46 ----
  #include "dconf.h"
  #include "minfree.h"
  #include "utils.h"
  
  static const char USAGE[] = "\
! Usage: %s [-enuy] [-c kernel | curproc | all ] [-d dump-device | swap ]\n\
          [-m min {k|m|%%} ] [-s savecore-dir] [-r root-dir] [-z on|off]\n";
  
! static const char OPTS[] = "einuyc:d:m:s:r:z:";
  
  static const char PATH_DEVICE[] = "/dev/dump";
  static const char PATH_CONFIG[] = "/etc/dumpadm.conf";
  
  int
*** 49,58 ****
--- 50,60 ----
  
          u_longlong_t minf;
          struct stat st;
          int c;
          int dflag = 0;                  /* for checking in use during -d ops */
+         int eflag = 0;                  /* print estimated dump size */
          int dcmode = DC_CURRENT;        /* kernel settings override unless -u */
          int modified = 0;               /* have we modified the dump config? */
          char *minfstr = NULL;           /* string value of -m argument */
          dumpconf_t dc;                  /* current configuration */
          int chrooted = 0;
*** 119,129 ****
                                  if (dconf_str2device(&dc, optarg) == -1)
                                          return (E_USAGE);
                                  dflag++;
                                  modified++;
                                  break;
! 
                          case 'i':
                                  /* undocumented option */
                                  if (chrooted) {
                                          warn(gettext("-i and -r cannot be "
                                              "used together\n"));
--- 121,133 ----
                                  if (dconf_str2device(&dc, optarg) == -1)
                                          return (E_USAGE);
                                  dflag++;
                                  modified++;
                                  break;
!                         case 'e':
!                                 eflag++;
!                                 break;
                          case 'i':
                                  /* undocumented option */
                                  if (chrooted) {
                                          warn(gettext("-i and -r cannot be "
                                              "used together\n"));
*** 166,175 ****
--- 170,187 ----
                                  break;
                          }
                  }
          }
  
+         if (eflag) {
+                 if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'e' &&
+                     !argv[1][2])
+                         return (dconf_get_dumpsize(&dc) ? E_SUCCESS : E_ERROR);
+                 else
+                         die(gettext("-e cannot be used with other options\n"));
+         }
+ 
          if (douuid)
                  return (dconf_write_uuid(&dc) ? E_SUCCESS : E_ERROR);
  
          if (minfstr != NULL) {
                  if (minfree_compute(dc.dc_savdir, minfstr, &minf) == -1)