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B2G updates can be of multiple types: - OTA, applied without rebooting the device, - FOTA with only Gecko/Gaia, - FOTA with whole system partition files, - FOTA dumping partitions images. Each type of updates has its advantages and drawbacks. There is an extensive documentation maintained on MDN about each and the options: https://developer.mozilla.org/en-US/Firefox_OS/Building_and_installing_Firefox_OS/Firefox_OS_update_packages All those updates are being packaged as a MAR file that gets injected into the classical Firefox update mechanism, submitted to Balrog and downloaded by the client. The content of the MAR will however depend on the type of update: an OTA update will packate a Gecko and Gaia set of files to update those parts; while any FOTA package is just an update.zip that will get applied in recovery mode on the device. So one fundamental difference is that OTA will not reboot your device (just Gecko) while FOTA requires a working recovery mode and will reboot your device. But OTA needs more system partition space to get applied, and it can only update files that are within the /system/b2g/ directory. FOTA on the other hand can update anything since the payload will contain an update script written in Edify (Android recovery update scripting language). For each device we might need to produce several types of updates that will be pushed to users depending on the context: for some users we want to push just a Gecko/Gaia update, for some we know that we need to update more content and thus we need to send some partitions. Previously, the b2g_build.py script would only allow one kind of update payload to be produced for each device available: we would need to have a device "flame-kk-ota" and "flame-kk-fota" just to produce the OTA and FOTA packages for the same device, thus resulting in a waste of computing power and storage. This commit introduces a new field "update_types" that can take an array of values: - ota, to produce an OTA package as before - fota, to produce a FOTA package with only Gecko/Gaia - fota:full, to produce a FOTA package of all files of the system partition - fota:fullimg, to produce a FOTA package dumping partitions The old "update_type" will be used in the absence of "update_types". And if none are present, we will keep defaulting to generating OTA as previously. |
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