11626 introduce /etc/versions/build
11627 clean up UUID code for ::status

*** 20,30 ****
   */
  /*
   * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2013 by Delphix. All rights reserved.
   *
!  * Copyright 2018 Joyent, Inc.
   */
  
  #include <kmdb/kmdb_kvm.h>
  #include <kmdb/kvm.h>
  #include <kmdb/kmdb_kdi.h>
--- 20,30 ----
   */
  /*
   * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2013 by Delphix. All rights reserved.
   *
!  * Copyright 2019 Joyent, Inc.
   */
  
  #include <kmdb/kmdb_kvm.h>
  #include <kmdb/kvm.h>
  #include <kmdb/kmdb_kdi.h>
*** 47,56 ****
--- 47,57 ----
  #include <dlfcn.h>
  #include <sys/isa_defs.h>
  #include <sys/kobj.h>
  #include <sys/kobj_impl.h>
  #include <sys/bitmap.h>
+ #include <sys/uuid.h>
  #include <vm/as.h>
  
  static const char KMT_RTLD_NAME[] = "krtld";
  static const char KMT_MODULE[] = "mdb_ks";
  static const char KMT_CTFPARENT[] = "genunix";
*** 550,560 ****
  /*ARGSUSED*/
  static int
  kmt_status_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  {
          struct utsname uts;
!         char uuid[37];
          kreg_t tt;
  
          if (mdb_tgt_readsym(mdb.m_target, MDB_TGT_AS_VIRT, &uts, sizeof (uts),
              "unix", "utsname") != sizeof (uts)) {
                  warn("failed to read 'utsname' struct from kernel\n");
--- 551,561 ----
  /*ARGSUSED*/
  static int
  kmt_status_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  {
          struct utsname uts;
!         char uuid[UUID_PRINTABLE_STRING_LENGTH];
          kreg_t tt;
  
          if (mdb_tgt_readsym(mdb.m_target, MDB_TGT_AS_VIRT, &uts, sizeof (uts),
              "unix", "utsname") != sizeof (uts)) {
                  warn("failed to read 'utsname' struct from kernel\n");
*** 566,585 ****
              (int)(sizeof (void *) * NBBY),
              (*uts.nodename == '\0' ? "(not set)" : uts.nodename));
          mdb_printf("operating system: %s %s (%s)\n",
              uts.release, uts.version, uts.machine);
  
!         if (mdb_tgt_readsym(mdb.m_target, MDB_TGT_AS_VIRT, uuid, sizeof (uuid),
!             "genunix", "dump_osimage_uuid") != sizeof (uuid)) {
!                 warn("failed to read 'dump_osimage_uuid' string from kernel\n");
!                 (void) strcpy(uuid, "(error)");
!         } else if (*uuid == '\0') {
!                 (void) strcpy(uuid, "(not set)");
!         } else if (uuid[36] != '\0') {
!                 (void) strcpy(uuid, "(invalid)");
          }
-         mdb_printf("image uuid: %s\n", uuid);
  
          mdb_printf("DTrace state: %s\n", (kmdb_kdi_dtrace_get_state() ==
              KDI_DTSTATE_DTRACE_ACTIVE ? "active (debugger breakpoints cannot "
              "be armed)" : "inactive"));
  
--- 567,584 ----
              (int)(sizeof (void *) * NBBY),
              (*uts.nodename == '\0' ? "(not set)" : uts.nodename));
          mdb_printf("operating system: %s %s (%s)\n",
              uts.release, uts.version, uts.machine);
  
!         mdb_print_buildversion();
! 
!         if (mdb_readsym(uuid, sizeof (uuid),
!             "dump_osimage_uuid") == sizeof (uuid) &&
!             uuid[sizeof (uuid) - 1] == '\0') {
!                 mdb_printf("image uuid: %s\n", uuid[0] != '\0' ?
!                     uuid : "(not set)");
          }
  
          mdb_printf("DTrace state: %s\n", (kmdb_kdi_dtrace_get_state() ==
              KDI_DTSTATE_DTRACE_ACTIVE ? "active (debugger breakpoints cannot "
              "be armed)" : "inactive"));