On 2016-08-09, at 9:53 AM, Konstantin Khomoutov
> On Mon, 8 Aug 2016 21:27:43 -0700
> Michael <keybou...@gmail.com> wrote:
>> Can someone explain stacked git?
>> It was referenced in "Git from the bottom up", but I've never used
>> Quilt, and neither project really explains what it is for/doing.
> Well, there's certain kind of changes -- relative to some "upstream" --
> you might keep, which are in essense "pending" or are just not going to
> be integrated upstream for some reason.
> A good example is software packaging performed by folks who maintain
> GNU/Linux-based distributions: when you download a tarball containing
> some release of some software package you often want to tweak certain
> bits in the source code of confiuration system of that piece of
> software before actually building it to produce a package for your OS.
> This might amount to relocating certain files or patching some string
> resources or artwork etc. Another common case is fixing a bug.
> Such changes are usually maintained as a series of patch files.
> Tools like quilt basically maintain a file named, well, "series",
> containing the list of names of files containing actual patches in a
> textual format -- which is usually "unidiff".
> Quilt and the tools of its ilk is able to start from a pristine state of
> the sources and then apply each patch file from the series in turn -- to
> produce the modified state ready to be built. Such tools can do more
> than that: they are able to de-apply the patches in the reverse order
> and "refresh" the patch files -- using the updated state of the source
> So, before powerful enough VC systems came into existence, patch series
> was the strategy everyone was using to maintain a set of local changes
> to some upstream target -- possibly changing in time.
> Sure, at some point some clever person noticed that a series of commits
> on a branch of a VCS system is able to neatly represent a patch series,
> and basically that's what `stgit` does.
> IMO, the closest thing to think of in plain Git sort of matching this
> functionality is a local branch which was once forked off some upstream
> branch, contains a series of commits and gets rebased from time to time
> on top of the updated state of its upstream branch.
> Note that patch series are not going away anytime soon. Say, Debian
> makes heavy use of them in its packaging routine (even though it has
> VC-relaed tooling to help with this task, such as the `git-buildpackage`
> program). The reason for this is two-fold:
> * While there exists a certain pressure to standardize on Git as /the/
> VC tool for everything, this won't probably happen in the near to
> * Upstreams and casual users should have easy (and automated) access to
> the information of what changes the OS applies to the pristine
> software releases pulled from their respective upstreams.
> Patch series fit this bill rather neatly.
So, it's basically a set of local changes from the official source
distribution? And tools for managing that?
I am thinking of groups like MacPorts that maintain their port information as a
set of diffs from the official upstream code.
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