[OE-core] [PATCH] sstate.bbclass: preserve time when unstaging files

[Enrico Scholz]

Richard Purdie <richard.purdie at linuxfoundation.org> writes:

>> > where the option was added deliberately to deal with time mismatch
>> > between autobuilders which was causing real world bugs.
>> 
>> But the real bug is the time mismatch in the autobuilders, isn't it?
>> And this can/should be solved by synchronizing time by ntp on them
>> instead of applying dirty hacks like resetting file dates.
>
> I have asked that ntp be installed/fixed on the autobuilders to sort the
> problem out but it seems that even with ntp running, mismatches can
> happen (e.g. misconfigured timezones).

Really? The only timezone related problems might arise when a package
makes 'touch -d <date>' during build.  But I can not remember that I
have ever seen such a package and this problem should be easy to
localize.

Else, timezone configuration is completely uninteresting for comparing
timestamps or for setting time from ntp.


> Worse, when this does happen the failures are extremely unpredictable
> and hard to debug. It causes things to repeatedly recompile for example,
> even during do_install.

How comes do_install() into the game?  'populate-lic' are the only
sstate files created before do_install() and I can not imagine how they
affect the other build phases; do_compile() results are not sstated
(and with the 'tar -m' thing, timestamps get havoc completely causing
unpredictable rebuilds).

When do_install() is executed, all the following sstate files
(populate_sysroot, package) are invalidated and must be recreated.  So
your problem with do_install() sounds more like an incomplete/racy
cleanup of old files.



Enrico