[mythtv] Decision on FFmpeg repository

[Ian Campbell]

On Fri, 2018-05-18 at 08:33 +0100, Ian Campbell wrote:
> On Fri, 2018-05-18 at 08:30 +0100, Ian Campbell wrote:
> > On Thu, 2018-05-17 at 15:05 -0400, Peter Bennett wrote:
> > > 3. A commit hash may no longer identify what source code was used
> for
> > > a build, because you cannot tell if they remembered to update the
> > > submodule. I suppose we need to add a submodule hash to the
> version
> > > string.
> > 
> > IIRC the commit of the submodule is committed to the main repo (in
> > .gitmodules or some such) and `git status` et al will show the repo
> as
> > dirty if the submodule is either dirty or not at the named
> revision.
> 
> It turns out IRinC(orrectly), in qemu.git/.gitmodules I see:
>    [submodule "roms/vgabios"]
>            path = roms/vgabios
>            url = git://git.qemu-project.org/vgabios.git/
>    [submodule "roms/seabios"]
>            path = roms/seabios
>            url = git://git.qemu-project.org/seabios.git/
> 
> So it seems the precise commit is not stored there. The
> gitsubmodules(7) and gitmodules(5) manpages do not mention another
> field which might be used to store the commit either.
> 
> I stand corrected.

Or maybe not ;-)

https://git.qemu.org/?p=qemu.git;a=commit;h=ad30c0b0d86957a0be41dcbcd23659c18a61065c

show an update of the seabio entry, as you can see it is modifying a
magic file at the path `roms/seabios` which is then shadowed by
the submodule. This file is checked in and tracked as part of the main
repo:
   diff --git a/roms/seabios b/roms/seabios
   index 33fbe13a3e..01a84bea2d 160000
   --- a/roms/seabios
   +++ b/roms/seabios
   @@ -1 +1 @@
   -Subproject commit 33fbe13a3e2a01e0ba1087a8feed801a0451db21
   +Subproject commit 01a84bea2d28a19d2405c1ecac4bdef17683cc0c

I can't see the sub command which was used to update this, but I guess
is must be there somewhere...

Ian.