CVS log for src/sbin/gpt/uuid.c

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When generating timestamp based GUIDs for reproducable builds
- increment timestamp by 100ns for each partition.
- use the standard time-based UUID format (type 1) and don't
  pretend it's a random number (type 4).
- make the -T option actually work for the uuid command.

Random GUIDs:
  start   size  index  contents
     34   1000      1  GPT part - d93ba067-a788-4ce0-99b8-0ead51f00215
   1034   2000      2  GPT part - bebba77a-7fdc-4ca0-a1bf-7450aa871d41

d93ba067-a788-4ce0-99b8-0ead51f00215:
Version 4 Random
Variant 2 RFC 4122
Data D9 3B A0 67 A7 88 4C E0 99 B8 0E AD 51 F0 02 15

bebba77a-7fdc-4ca0-a1bf-7450aa871d41:
Version 4 Random
Variant 2 RFC 4122
Data BE BB A7 7A 7F DC 4C A0 A1 BF 74 50 AA 87 1D 41

Timestamp based GUIDs:
  start   size  index  contents
     34   1000      1  GPT part - 0a524600-8eba-11ef-8000-000000000000
   1034   2000      2  GPT part - 0a524601-8eba-11ef-8000-000000000000

0a524600-8eba-11ef-8000-000000000000:
Version 1 Time and MAC based
Variant 2 RFC 4122
Node 00:00:00:00:00:00
Clock 0
Time 2024-10-20T08:05:16.000000.0Z

0a524601-8eba-11ef-8000-000000000000:
Version 1 Time and MAC based
Variant 2 RFC 4122
Node 00:00:00:00:00:00
Clock 0
Time 2024-10-20T08:05:16.000000.1Z

Node (host MAC address) and clock (sequence number incremented whenever
the time went backwards) are left undefined (all zero) for our purpose.

Add -U option to specify new UUID
Add OpenBSD
from Anon Ymous

Mostly merge changes from HEAD upto 20200411

file uuid.c was added on branch phil-wifi on 2020-04-13 08:03:20 +0000

Add an "uuid" command to generate a new UUID for a portion.  The
primary intention is for use for after cloning disks to prevent
collisions.