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Re: GIT tutorials (was: Re: Fix bug in GSM MAP, have problems with GIT)
From: Hadriel Kaplan <hadriel.kaplan () oracle com>
Date: Tue, 11 Mar 2014 18:32:45 -0400


On Mar 11, 2014, at 5:38 PM, Evan Huus <eapache () gmail com> wrote:

On Tue, Mar 11, 2014 at 5:34 PM, Hadriel Kaplan
<hadriel.kaplan () oracle com> wrote:

Googling around a bit for this issue - because other apps must have this same problem and their users - shows people 
either creating a ton of tags, or scripting with the rev-list count to generate sequential numbers in their commits 
to master.

How did SVN deal with a rev number in older branches, when you either backported a change from a newer release or 
committed a change only to the older release?  Did it use the same rev number, or give it a new one? (ie, was it the 
same/shared numberspace?)

It gave it a new one (just like backported git revs get new SHAs) but
that's not really the problem. The problem is that the user only knows
their build was at some particular SHA; they don't know whether the
SHA they're interested in came before or after it.

No, but I was already jumping ahead to a possible (crazy) solution. :)

Since SVN used a single number space but gave each branch's commits new numbers, you can create a new "revision" string 
that looks like "<tag>:<number>", where <tag> is the branch tag and <number> is the rev-list count of origin HEAD for 
each branch.  The <tag> keeps them unique per branch, and also quickly tells the user which release branch that change 
is in.

Is there a way to have a hook script that only takes effect when committing into the master branches? (ie, only when 
you guys cherry-pick and commit a change to the real master/master-x.x repositories?)  If so, you could create a script 
which gets invoked during the cherry-pick commit into master/master-x.x, which inserts this "<tag>:<number>" string 
into the commit message.[1] For example adds a "Revision: 1.11:12345" to the end of the commit message, similar to the 
commit-msg Change-ID line.

That way backporting also appends additional revision info lines to the commit message, and each one is 
unique/identifiable by the <tag> portion.

Copy that "<tag>:<number>" into the cherry-pick message you guys post on gerrit reviews (or is that scripted too?).  
And lastly, when the buildbots build a new nightly or tagged release, have them use the rev-list count for the given 
branch being built, for the binary file name and about-page info in the build.

-hadriel
[1] making it an atomic operation might be tricky though - dunno anything about how git does that. Might want to have 
the <number> be stored in a git-controlled file, in each repository?

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