Re: [gentoo-portage-dev] [PATCH] egencache --update-changelogs: fix timestamp assumptions (bug 579292)

[Zac Medico]

On 04/07/2016 11:51 PM, Brian Dolbec wrote:
> the above looks good, but what about:
>
>
> [19:01] <dwfreed|phone> just use --first-parent
> [19:01] <dwfreed|phone> also take into account merge commits
> [19:03] <dwfreed|phone> git really complicates ChangeLog generation in general
> [19:03] <dwfreed|phone> because your ChangeLog should reflect when these commits became part of master, but you still need to perserve their messages
> [19:04] * zmedico is skeptical about the linearizability of the timestamps
> [19:04] <dwfreed|phone> if you don't look at merge commits for your timestamps of changes, correct, it is not linear
> [19:05] <dwfreed|phone> but if you take a set of commits and determine when they became part of master, it is linear
> [19:05] <dol-sen> so: git log --first-parent --format=%ct -1 .
> [19:05] <dol-sen> to get the last timestamp of changes to htat pkg
> [19:06] <dol-sen> then use that timestamp
> [19:06] <dol-sen> lmod = self.grab(['git', self._work_tree, 'log', '--format=%ct', '-1', '.'])
> [19:06] <dol-sen> that is the current code
> [19:06] <dwfreed|phone> git log -m --first-parent --format=%ct -1 .
> [19:06] <dol-sen> so just add the --first-parent option?
> [19:07] <dwfreed|phone> you want -m toolmod = self.grab(['git',
> self._work_tree, 'log', '--format=%ct', '-1', '.'])
>
> [19:06] <dwfreed|phone> git log -m --first-parent --format=%ct -1 .
> [19:06] <dol-sen> so just add the --first-parent option?
> [19:07] <dwfreed|phone> you want -m too
>
>
> Don't we need to add the -m --first-parent  ???
>

I don't know enough about how those options matter for git log behavior,
but I trust that dwfreed has good reasons to recommend them. Maybe we
should add them in a separate patch, possibly with some explanation
about how they are useful in this context.
-- 
Thanks,
Zac