On Fri, Feb 28, 2020 at 11:16:09AM +0100, Roland Hieber wrote:
> On Thu, Feb 27, 2020 at 03:44:48PM +0100, Alexander Dahl wrote:
> > Signed-off-by: Alexander Dahl <[email protected]>
> > ---
> >  rules/os-release.make | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/rules/os-release.make b/rules/os-release.make
> > index 5156156a0..ba607aa38 100644
> > --- a/rules/os-release.make
> > +++ b/rules/os-release.make
> > @@ -56,7 +56,7 @@ $(STATEDIR)/os-release.targetinstall: 
> > $(PTXDIST_PTXCONFIG) $(PTXDIST_PLATFORMCON
> >             @PTXDIST_VERSION@, $(PTXDIST_VERSION_FULL))
> >  
> >     @$(call install_replace, os-release, /usr/lib/os-release, \
> > -           @DATE@, $(shell date +%FT%T%z))
> > +           @DATE@, $(shell date --utc --date @$(SOURCE_DATE_EPOCH) 
> > '+%FT%T%z'))
> 
> So I think we
> should rather set the build date to the modification time of the newest
> source file in the BSP. We could do that by defining a variable in
> scripts/lib/ the same manner as PTXDIST_BSP_AUTOVERSION.

That isn't as easy as I thought, as file mtimes get updated when doing a
VCS checkout. Also we would have to list all files in the BSP (and all
base layers), which could potentially be a very I/O heavy operation, or
need to deal with blacklists or whitelists of folders, but then needed
to make sure nothing in that folders is included in a bash script /
kconfig file / Makefile.

Instead we could use the date of ./tarball-version (like
PTXDIST_BSP_AUTOVERSION does too) or the current VCS commit; or if the
BSP is not a VCS repo, or if the worktree has local changes, fall back
to searching for the most recent file in the current BSP.

Does this sound reasonable?

 - Roland

-- 
Roland Hieber, Pengutronix e.K.          | [email protected]     |
Steuerwalder Str. 21                     | https://www.pengutronix.de/ |
31137 Hildesheim, Germany                | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686         | Fax:   +49-5121-206917-5555 |

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