I wouldn't trust incremental builds in 5.1 very much at all -- there are many changes that you can make that will not cause a rebuild. Reliability increased in 7.0 significantly with the introduction of Ninja, where we'd actually rebuild a file after the command used to create it changed.
Some of the core changes related to http://source.android.com/devices/tech/ota/reduce_size.html made it into 6.0.1, so there's a lot of core problems in 5.1 related to reproducibility. - Dan On Mon, Mar 6, 2017 at 7:10 AM Aby Mathews <[email protected]> wrote: > Hi Dan, > > Thank you for your reply. > > From your reply what I infer is: better to go for clean build for OTA, as > incremental build may have issues. I think I would follow that; a wrong > OTA would be a costly risk for me. > In parallel I will play with build.prop to see if I can rectify the issue. > > I am building v5.1. > > I am okay with the additional time taken in build; what I am not happy is > the 'wrong diffs' identified by 'ota_from_target_files'. I use same > machine and same set of commands for build. I do not touch anything, but > one app folder. (I want this app as a priv-app; hence the build and OTA. I > deploy it to few thousand devices). > > Regards, > > Aby. > > On Monday, March 6, 2017 at 4:41:38 AM UTC+5:30, Dan Willemsen wrote: > > We've only recently begun trusting incremental builds, though all of our > release builds (that would go to an OTA system) are still full clean builds. > > Which android version are you building? Two clean builds on Android-N > should be quite similar, especially once you follow the guidelines here for > any code that you've added: > http://source.android.com/devices/tech/ota/reduce_size.html > > If you still want to use incremental builds, I would suggest running "m > installclean" in between the builds -- that "fixes" a number of issues with > files being uninstalled in between builds. > > It looks like to force regeneration of this file, you could remove > $OUT/obj/ETC/system_build_prop_intermediates/system.prop. Or just change > the value of BUILD_ID, which should probably change between builds sent to > an OTA system anyway. > > - Dan > > On Sun, Mar 5, 2017 at 9:49 AM Aby Mathews <[email protected]> wrote: > > > down votefavorite > <http://stackoverflow.com/questions/42578037/aosp-ota-incremental-version-issue#> > > I am facing an issue with AOSP incremental OTA build. If I do an > incremental build (without make clean), build completes fast and I get a > smaller OTA file, and OTA updates successfully on the target system; BUT > the incremental build number of target system remains same. > (os.build.version.incremental returns old number) So next time when another > OTA is generated and tried to update, it fails, giving error : "package > expects build fingerprint of ../../../(build number)/.. ". as, incremental > build number is part of build fingerprint. > > If I do 'make clean' before 'make dist', things work fine; but build time > is much more and OTA file is bloated; many packages which are NOT modified > are identified as modified by some %, and is added to OTA. > > How to increment build number without 'make clean' ? > > -- > -- > You received this message because you are subscribed to the "Android > Building" mailing list. > > To post to this group, send email to [email protected] > > > To unsubscribe from this group, send email to > > [email protected] > > > For more options, visit this group at > http://groups.google.com/group/android-building?hl=en > > --- > You received this message because you are subscribed to the Google Groups > "Android Building" group. > > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > > > For more options, visit https://groups.google.com/d/optout. > > -- > -- > You received this message because you are subscribed to the "Android > Building" mailing list. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-building?hl=en > > --- > You received this message because you are subscribed to the Google Groups > "Android Building" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- -- You received this message because you are subscribed to the "Android Building" mailing list. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-building?hl=en --- You received this message because you are subscribed to the Google Groups "Android Building" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
