Allow --repack option to change kernel version number.

utility/vbutil_kernel.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Verified boot kernel utility
  */
 
 #include <errno.h>
 #include <getopt.h>
 #include <inttypes.h>  /* For PRIu64 */
@@ skipping 73 matching lines @@
           "    --config <file>           Command line file\n"
           "\n"
           "  Optional:\n"
           "    --pad <number>            Verification padding size in bytes\n"
           "    --vblockonly              Emit just the verification blob\n",
           progname);
   fprintf(stderr,
           "\nOR\n\n"
           "Usage:  %s --repack <file> [PARAMETERS]\n"
           "\n"
-          "  Required parameters (of --keyblock and --config at least "
-          "one is required):\n"
+          "  Required parameters (of --keyblock, --config, and --version \n"
+          "    at least one is required):\n"
           "    --keyblock <file>         Key block in .keyblock format\n"
           "    --signprivate <file>"
           "      Private key to sign kernel data, in .vbprivk format\n"
           "    --oldblob <file>          Previously packed kernel blob\n"
           "    --config <file>           New command line file\n"
+          "    --version <number>        Kernel version\n"
           "\n"
           "  Optional:\n"
           "    --pad <number>            Verification padding size in bytes\n"
           "    --vblockonly              Emit just the verification blob\n",
           progname);
   fprintf(stderr,
           "\nOR\n\n"
           "Usage:  %s --verify <file> [PARAMETERS]\n"
           "\n"
           "  Optional:\n"
@@ skipping 728 matching lines @@
   switch(mode) {
     case OPT_MODE_PACK:
       bp = NewBlob(version, vmlinuz, bootloader, config_file);
       if (!bp)
         return 1;
       r = Pack(filename, key_block_file, signprivate, bp, pad, vblockonly);
       FreeBlob(bp);
       return r;
 
     case OPT_MODE_REPACK:
-      if (!config_file && !key_block_file) {
+      if (!config_file && !key_block_file && !version) {
         fprintf(stderr,
-                "You must supply at least one of --config and --keyblock\n");
+                "You must supply at least one of "
+                "--config, --keyblock or --version\n");
         return 1;
       }
 
       bp = OldBlob(oldfile);
       if (!bp)
         return 1;
       r = ReplaceConfig(bp, config_file);
       if (!r) {
+        if (version) {
+          bp->kernel_version = version;
+        }
         r = Pack(filename, key_block_file, signprivate, bp, pad, vblockonly);
       }
       FreeBlob(bp);
       return r;
 
     case OPT_MODE_VERIFY:
       return Verify(filename, signpubkey, verbose);
 
     default:
       fprintf(stderr,
               "You must specify a mode: --pack, --repack or --verify\n");
       return PrintHelp(progname);
   }
 }