[llvm-dev] [cfe-dev] [lldb-dev] Sequential ID Git hook

[NAKAMURA Takumi via llvm-dev]

"git-describe -t" works also for lw tags.

2016年7月4日(月) 2:48 Jared Grubb via cfe-dev <cfe-dev at lists.llvm.org>:

>
> El jun. 30, 2016, a las 19:31, Matthias Braun via cfe-dev <
> cfe-dev at lists.llvm.org> escribió:
>
>
> On Jun 30, 2016, at 4:14 PM, Renato Golin via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>
> On 30 Jun 2016 10:20 p.m., "Robinson, Paul" <paul.robinson at sony.com>
> wrote:
> > We've since stopped creating the tags, and gotten used to not having
> > them.  We do the 'rev-list --count' trick which mainly gets recorded as
> > one component of the version number, and it has been working for us.
>
> Does that work for sub modules inside the umbrella project?
>
> How can you trigger a hook in the umbrella project for commits inside the
> sub modules?
>
> First: This is purely about generating sequential revision numbers, it
> does not help setting up a server hook to update the submodule references
> in the meta repository. The point I am trying to make here is that we only
> need to solve the problem of updating the submodule references, and that
> generating sequential ID numbers as an alternative to git hashes is no
> problem.
>
> As far as I can see we need the following operations for sequential ID
> numbers and they are all easy enough to perform with git on the client side:
>
> 1. Produce revision number for current checkout (to use in tool --version
> output):
> You can put something like
>   > echo "#define VERSION $(git rev-list --count HEAD)" > version.h
> in your buildsystem
>
> 2. Convert git hash to revision number:
>   git rev-list --count $HASH
>
> 3. Convert revision number $NUM to git hash:
>   git rev-list HEAD | tail -n $NUM | head -n 1
>
>
> I just want to point out another alternative that I often use in my
> projects:  (Example from buildbot repo I had handy)
>
> $ git describe
> v0.9.0b8-579-ge06cac6
>
> The format is "TAG-N-gREV", where TAG is the closest reachable git tag in
> the past ("v0.9.0b8"), N is the relative number of revisions past that tag
> (579), and REV is the short revision to make it unique and easy to locate
> ("e06cac6", the 'g' is a literal character that prefixes the revision). In
> other words, that "-579-" represents a monotonically increasing value
> relative to the named tag and might serve your purposes.
>
> Jared
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