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

@@ -21,10 +21,11 @@
 
 /*
  * 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>

@@ -65,10 +66,15 @@
 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 */

@@ -809,10 +815,12 @@
 }
 
 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();

@@ -836,10 +844,22 @@
         (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'.