UUID's provide a common format for identification and database retrieval.
The attached patch adds a header tag format to RPM queries.
- UUIDv1 time stamps (for events like build/install times):
```
$ ./rpm -q --qf '%{buildtime:uuidv1}\n' bash
c60fd500-bc0a-11e7-804e-003048b801de
```
- UUIDv3 namespace identifiers based on MD5 (like package/header digests)
```
$ ./rpm -q --qf '%{sigmd5:uuidv3}\n' bash
c24fd63e-14c4-32d1-84f5-168a1f2908db
```
- UUIDv4 random nonces (overkill because random, but added for completeness)
```
$ ./rpm -q --qf '%{sigmd5:uuidv4}\n' bash
b7a15d96-c4cd-4e41-8598-6463375cb39f
```
- UUIDv5 namespace identifiers based on SHA1 (like package/header digests)
```
$ ./rpm -q --qf '%{sigmd5:uuidv5}\n' bash
9292a557-f445-5f36-9b79-8e79a6efaaa2
```
The UUIDv3/UUIDv5 name spaces can be configured through optional macros
(defaults below)
```
%_uuid_auth http://rpm.org
%_uuid_path /packages
```
For reference, the actual text used for, say, Sha1header, in a namespace UUID
looks like
```
http://rpm.org/packages/Sha1header/XXXXXXXXXXXXXXXXXXXXXXXX
```
Essentially a prefix (to make the namespace unique) of %_uuid_auth and
%_uuid_path followed by a tag name and a tag value.
UUID's will be the starting point for a RPM+LMDB implementation used as header
retrieval keys.
You will need the acinclude.m4 file from issue #257 to use the patch below.
Adding the hires timestamps from issue #197 would improve the UUIDv1
granularity (not implemented).
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