Re: [PATCH 14/30] subtree: drop support for git < 1.7

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On Fri, 23 Apr 2021 17:50:11 -0600,
Eric Sunshine wrote:
> 
> On Fri, Apr 23, 2021 at 7:28 PM Luke Shumaker <lukeshu@xxxxxxxxxxx> wrote:
> > On Fri, 23 Apr 2021 14:31:46 -0600, Eric Sunshine wrote:
> > > Is there a higher reason for this change aside from "let's do it
> > > because we can"? For instance, are subsequent changes going to take
> > > advantage of features only present in more recent Git versions which
> > > would be painful or impossible to support with the older Git?
> > >
> > > The downside of this change is that, while git-subtree may live in
> > > git.git, it's still just "contrib", so people might grab git-subtree
> > > from a modern git.git but then end up using it with an older Git
> > > installation. That's not to say that doing such a thing is guaranteed
> > > to work anyhow, but we don't need to make it harder on people if there
> > > isn't a good reason (hence my question about whether subsequent
> > > changes will actually take advantage of newer Git features).
> >
> > With the goal of making the whole thing easier to hack on, this just
> > seemed like an easy (if small) piece of fat to trim.
> >
> > I guess I should include here that my bias is: With the 'git' package
> > that Parabola inherits from Arch Linux, you install 'git', you get a
> > working 'git subtree'.  If you want 'git send-email' to work, you also
> > need to install several other Perl packages.  Like, it might live in
> > the "contrib" directory, but it's de-facto at least as much a "part
> > of" Git as send-email is.
> >
> > So that's the mindset I started from.  It looks like the latest macOS
> > supports me on that, but other distros like Fedora don't (Fedora has a
> > separate 'git-subtree' package).  If I take a step back, I realize
> > that mindset is flawed, but that's where I started from.
> >
> > I don't think any of the other work depends on this (I think the only
> > commit that will conflict if we drop it is the "rename a some
> > variables" commit in this patchset).  It's very possible that
> > something else I do relies on newer git features (I'm not testing
> > against older git), but that's not something I did intentionally.
> >
> > I just figured this would be a welcome piece of cleanup.  If that's
> > not the case, I don't have a problem dropping it.
> 
> As a person who does not and has never used git-subtree, I don't have
> a strong opinion, and any git-subtree opinion I might have wouldn't
> carry any weight. I do have a bit of reflexive negative reaction to
> such removals in general if there's no clear and strong benefit,
> perhaps because my daily-use computers are old (perhaps ancient, as in
> 10-25 years old), so I am regularly stung by support being dropped by
> packages I use. That's why I was asking if later patches would take
> advantage of some newer Git feature.

I'm sending this from my work laptop, which is a little newer (2015),
but my personal laptop (2007) is sitting on the end-table.  So I
commiserate.  I'm a modern-software on old-hardware kind of guy
though, so I don't mind dropping support for old software versions.

> Anyhow, I wasn't specifically asking for the patch to be dropped. As a
> reviewer I rather wanted to better understand the reason for the
> change beyond the somewhat hand-wavy "git-subtree now lives in-tree".
> If you happen to re-roll, perhaps you can expand the commit message a
> bit with something more concrete (for instance, how some packagers
> include git-subtree by default) to better sell the patch to reviewers
> who actually have investment in git-subtree (of which I am not one).
> Considering how old Git <1.7 is, it's quite likely that no current
> git-subtree users/reviewers would care about dropping support for such
> old versions.

I'll expand the commit message.

-- 
Happy hacking,
~ Luke Shumaker



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