23.07.2017 11:40, Jacob Keller пишет:
On Fri, Jul 21, 2017 at 12:03 PM, Stas Sergeev <stsp@xxxxxxx> wrote:
I wanted some kind of file to use it as a
build dependency for the files that needs
to be re-built when the head changes.
This works very well besides git gc.
What other method can be used as simply
as that? git show-ref does not seem to be
giving this.
There's no real way to do this, and even prior to 2007 when the file
always existed, there's no guarantee it's modification time is valid.
I'd suggest you have a phony rule which you always run, that checks
the ref, and sees if it's different from "last time" and then updates
a different file if that's the case. Then the build can depend on the
generated file, and you'd be able to figure it out.
OK, thanks, that looks quite simple too.
I will have to create the file by hands that
I expected git to already have, but it appears
not.
What's the real goal for depending on when the ref changes?
So that when users fill in the bug report, I can
see at what revision have the bug happened. :)
While seemingly "just a debugging sugar", the
hard experience shows this to be exceptionally
useful.
I think even linux kernel does something like
this, and solves that task the hard way. For
example I can see a script at scripts/setlocalversion
whose output seems to go to
include/config/kernel.release and a lot of
logic in the toplevel makefile about this.
So not liking the fact that every project solves
this differently, I was trying to get the solution
directly from git. But I'll try otherwise.
