Re: Subversion-style incrementing revision numbers
- From
Jakub Narebski <jnareb@gmail.com>
- Date
- Sep 19, 2006, 22:17 UTC
- Message-ID
- <eepq7l$dc$1@sea.gmane.org>
- In-Reply-To
- <eeppkl$rm9$2@sea.gmane.org>
Jakub Narebski wrote:
Show 23 quoted lines
> Joel Dice wrote: > >> I'm considering adopting Git for a medium-sized project which is currently >> managed using Subversion. I've used Git for a few smaller projects >> already, and the thing I've missed most from Subversion is the convenience >> of incrementing revision numbers. The following is a proposal to add this >> feature to Git. >> >> >> Rationale: >> >> Incrementing revision numbers (IRNs - an acronym I just made up) are >> useful in that they can be treated as auto-generated tags which are easier >> to remember and communicate than SHA hashes, yet do not require extra >> effort to create like real tags. Also, they have the advantage of being >> chronologically ordered, so if I assert that a bug was fixed in revision >> 42 of a shared repository, everyone may assume that revision 45 has that >> fix as well. > > That is true _only_ if you have linear history. If you have multiple > concurrent branches, revision 42 can be in branch 'next', revision '45' in > topic branch 'xx/topic' which forked before revision 42, and do not have > the fix.
Additionally, what does _chronological_ mean? Time the commit is recorded? Remember that in distributed development commits can be fetched from other repository, or arrive via email and applied using git-am. In git you can also rebase branch. Git records merges, and said merges are sometimes just fast-forward. All those difficulties have to be solved for IRNs.
By the way, there was similar proposal to add either hidden field ('note' like) to commit object denoting _generation_ of commit, or add cache of commits' generation numbers. Generation number of root (parentless) commit is 0, generation number of a commit is maximum of generation numbers of its parents plus 1. But this proposal was for easier and faster generation of topological order.
-- Jakub Narebski Warsaw, Poland ShadeHawk on #git