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

*** 21,30 ****
--- 21,31 ----
  
  /*
   * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   * Copyright 2017 Nexenta Systems, Inc.
+  * Copyright 2019 Joyent, Inc.
   */
  
  #include <sys/types.h>
  #include <sys/inttypes.h>
  #include <sys/param.h>
*** 65,74 ****
--- 66,80 ----
  static char dacffile[] = DACFFILE;
  
  char *self_assembly = "/etc/system.d/.self-assembly";
  char *systemfile = "/etc/system";       /* name of ascii system file */
  
+ #define BUILDVERSION_LEN (4096)
+ 
+ char *versionfile = "/etc/versions/build";
+ char buildversion[BUILDVERSION_LEN];
+ 
  static struct sysparam *sysparam_hd;    /* head of parameters list */
  static struct sysparam *sysparam_tl;    /* tail of parameters list */
  static vmem_t *mod_sysfile_arena;       /* parser memory */
  
  char obp_bootpath[BO_MAXOBJNAME];       /* bootpath from obp */
*** 809,818 ****
--- 815,826 ----
  }
  
  void
  mod_read_system_file(int ask)
  {
+         struct _buf *file;
+ 
          mod_sysfile_arena = vmem_create("mod_sysfile", NULL, 0, 8,
              segkmem_alloc, segkmem_free, heap_arena, 0, VM_SLEEP);
  
          if (ask)
                  mod_askparams();
*** 836,845 ****
--- 844,865 ----
          (void) mod_sysctl(SYS_SET_KVAR, NULL);
          param_check();
  
          if (ask == 0)
                  setparams();
+ 
+         /*
+          * A convenient place to read in our build version string.
+          */
+ 
+         if ((file = kobj_open_file(versionfile)) != (struct _buf *)-1) {
+                 if (kobj_read_file(file, buildversion,
+                     sizeof (buildversion) - 1, 0) == -1) {
+                         cmn_err(CE_WARN, "failed to read %s\n", versionfile);
+                 }
+                 kobj_close_file(file);
+         }
  }
  
  /*
   * Search for a specific module variable assignment in /etc/system.  If
   * successful, 1 is returned and the value is stored in '*value'.