RFR: JDK-8031567 Better model for storing source revision information

Thu Nov 24 14:54:26 UTC 2016

We are currently using "hg tip" to create the "source_tips" file, and 
correspondingly for the closed bundles.

But this is incorrect. It will show the latest committed version in the 
repo, not the actual workspace (i.e. the version we actually build).

For this, we should use "hg id" instead. If we have a clean workspace 
updated to the tip, it will produce the same output. Otherwise it will 
show what we build, with a traliing "+" if there are local, 
non-committed changed.

Also, we should not name the file "tip" in this case.

And finally, we do not need to sprinkle these files all around in all 
repos. The entire handling should be more clearly abstracted.

Bug: https://bugs.openjdk.java.net/browse/JDK-8031567
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8031567-clean-up-source-revision-stamps/webrev.01

/Magnus