ota : mettre à jour un device android, ok mais comment ça marche ?
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Mettre à jour un device Android, ok mais comment ça marche ?
pod
Montréal
Paris
Ce dont on ne parlera pas...
Qu’est-ce qu’une OTA ?
Qui a besoin de ce genre de solutions ?
À quoi ça sert ?
Défis techniques
Générer un paquet de mise à jour
% . build/envsetup.sh && lunch tardis-eng
% mkdir dist_output
% make dist DIST_DIR=dist_output
% ./build/tools/releasetools/ota_from_target_files \
dist_output/tardis-target_files.zip ota_update.zip
Ce que ça contientMETA-INF CERT.RSA CERT.SF com android metadata otacert google android update‐binary
updater‐script
MANIFEST.MF
mount("ext4", "EMMC", "/dev/block/platform/dw_mmc.0/by- ‐name/system", “/system");
file_getprop("/system/build.prop", "ro.build.fingerprint") ==
"google/mantaray/manta:4.4.3/KTU84L/1148727:user/release- ‐keys" ||
file_getprop("/system/build.prop", "ro.build.fingerprint") ==
"google/mantaray/manta:4.4.4/KTU84P/1227136:user/release- ‐keys" ||
abort("Package expects build fingerprint of google/mantaray/manta:4.4.3/KTU84L/
1148727:user/release- ‐keys or google/mantaray/manta:4.4.4/KTU84P/1227136:user/release- ‐keys; this
device has " + getprop("ro.build.fingerprint") + ".");
getprop("ro.product.device") == "manta" || abort("This package is for \"manta\" devices; this
is a \"" + getprop("ro.product.device") + "\".");
ui_print("Verifying current system...");
show_progress(0.100000, 0);
apply_patch_check("/system/app/BasicDreams.apk", "42b5544ed0a896f536c1d58ffe1c68a974f12687",
"67280e2672c034505ba417e6c0054be375415c08") || abort("\"/system/app/BasicDreams.apk\" has
unexpected contents.");
set_progress(0.000065);
set_metadata_recursive("/system/xbin", "uid", 0, "gid", 2000, "dmode", 0755, "fmode", 0755,
"capabilities", 0x0, "selabel", "u:object_r:system_file:s0");
ui_print("Patching remaining system files...");
apply_patch("/system/build.prop", "- ‐",
d7978a543a5677b77f7c1b15b5f583fb8fa14bd8, 2774,
4d220efc37eb1786bbb379ae31145bf7edd176d9, package_extract_file("patch/system/build.prop.p"));
set_metadata("/system/build.prop", "uid", 0, "gid", 0, "mode", 0644, "capabilities", 0x0);
unmount("/system");
Full vs. incremental% ./build/tools/releasetools/ota_from_target_files \ -i PREVIOUS-tardis-target_files.zip \ dist_output/tardis-target_files.zip incremental_ota_update.zip
Game of loaders // Updater
Game of loaders // Updaterprivate static final String KEY_SYSTEM_UPDATE_SETTINGS = "system_update_settings";
if (UserHandle.myUserId() == UserHandle.USER_OWNER) { Utils.updatePreferenceToSpecificActivityOrRemove( act, parentPreference, KEY_SYSTEM_UPDATE_SETTINGS, Utils.UPDATE_PREFERENCE_FLAG_SET_TITLE_TO_MATCHING_ACTIVITY); } else { // Remove for secondary users removePreference(KEY_SYSTEM_UPDATE_SETTINGS); }
Game of loaders // Updater<intent- filter android:priority="999"> <action android:name="android.settings.SYSTEM_UPDATE_SETTINGS" /> <category android:name="android.intent.category.DEFAULT" /> </intent- filter>
Game of loaders // Downloader
Game of loaders // DownloaderDownloadManager dm = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
DownloadManager.Request requestDownload = new DownloadManager.Request(url) .setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI) .setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN) .setVisibleInDownloadsUi(false) .setTitle(update.buildNumber) .setDestinationUri(getDestinationUri()) .setDescription(update.buildNumber);
return dm.enqueue(requestDownload);
Game of loaders // Downloader
<uses- permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" /><uses ‐permission android:name="android.permission.ACCESS_DOWNLOAD_MANAGER" /><uses- permission android:name="android.permission.ACCESS_DOWNLOAD_MANAGER_ADVANCED" />
<receiver android:name=".DownloadReceiver"> <intent- filter> <action android:name="android.intent.action.DOWNLOAD_COMPLETE" /> </intent ‐filter></receiver>
Game of loaders // Updater
Game of loaders // Updater// android.os.RecoverySystem
public static void installPackage (Context context, File packageFile)
public static void rebootWipeCache (Context context)
public static void rebootWipeUserData (Context context)
public static void verifyPackage (File packageFile,
RecoverySystem.ProgressListener listener, File deviceCertsZipFile)
Le jeu des loaders // Bootloader
Game of loaders // Recovery(er?)
Installing the update
After installing
<receiver android:name=".BootReceiver"> <intent-filter> <action android:name="android.intent.action.PRE_BOOT_COMPLETED" /> </intent-filter> </receiver>
Simple back-end
Industrial backend
Industrial backend
Industrial backend
Industrial backend
Branching your OTA
Device identification
Fragmentation
Version compatibility
Let´s have a look...
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