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Currently no timed/scheduled full-data backup operations are
performed by the OS, but the plumbing is now in place and can
be tested using 'adb shell bmgr fullbackup pkg [pkg2 pkg3 ...]'.
The LocalTransport test transport implementation has been augmented
to support the new full-data backup API as well.
In addition, 'adb backup' now takes the -compress/-nocompress
command line options to control whether the resulting archive is
compressed before leaving the device. Previously the archive was
always compressed. (The default is still to compress, as it will
usually reduce the archive size considerably.)
Internally, the core implementation of gathering the full backup
data stream from the target application has been refactored into
an "engine" component that is shared by both 'adb backup' and the
transport-oriented full backup task. The archive file header
generation, encryption, and compression logic are now factored out
of the engine itself instead of being hardwired into the data
handling.
Bug 15329632
Change-Id: I4a044faa4070d684ef457bd3e11771198cdf557c
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Change-Id: I29ee5e05a538c6836f18b9cc9331c74f41936b29
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Backup/restore now supports app widgets.
An application involved with app widgets, either hosting or publishing,
now has associated data in its backup dataset related to the state of
widget instantiation on the ancestral device. That data is processed
by the OS during restore so that the matching widget instances can be
"automatically" regenerated.
To take advantage of this facility, widget-using apps need to do two
things: first, implement a backup agent and store whatever widget
state they need to properly deal with them post-restore (e.g. the
widget instance size & location, for a host); and second, implement
handlers for new AppWidgetManager broadcasts that describe how to
translate ancestral-dataset widget id numbers to the post-restore
world. Note that a host or provider doesn't technically need to
store *any* data on its own via its agent; it just needs to opt in
to the backup/restore process by publishing an agent. The OS will
then store a small amount of data on behalf of each widget-savvy
app within the backup dataset, and act on that data at restore time.
The broadcasts are AppWidgetManager.ACTION_APPWIDGET_RESTORED and
ACTION_APPWIDGET_HOST_RESTORED, and have three associated extras:
EXTRA_APPWIDGET_OLD_IDS
EXTRA_APPWIDGET_IDS
EXTRA_HOST_ID [for the host-side broadcast]
The first two are same-sized arrays of integer widget IDs. The
_OLD_IDS values are the widget IDs as known to the ancestral device.
The _IDS array holds the corresponding widget IDs in the new post-
restore environment. The app should simply update the stored
widget IDs in its bookkeeping to the new values, and things are
off and running. The HOST_ID extra, as one might expect, is the
app-defined host ID value of the particular host instance which
has just been restored.
The broadcasts are sent following the conclusion of the overall
restore pass. This is because the restore might have occurred in a
tightly restricted lifecycle environment without content providers
or the package's custom Application class. The _RESTORED broadcast,
however, is always delivered into a normal application environment,
so that the app can use its content provider etc as expected.
*All* widget instances that were processed over the course of the
system restore are indicated in the _RESTORED broadcast, even if
the backing provider or host is not yet installed. The widget
participant is responsible for understanding that these are
promises that might be fulfilled later rather than necessarily
reflecting the immediate presentable widget state. (Remember
that following a cloud restore, apps may be installed piecemeal
over a lengthy period of time.) Telling the hosts up front
about all intended widget instances allows them to show placeholder
UI or similarly useful information rather than surprising the user
with piecemeal unexpected appearances.
The AppWidgetProvider helper class has been updated to add a new
callback, onRestored(...), invoked when the _RESTORED broadcast
is received. The call to onRestored() is immediately followed by
an invocation of onUpdate() for the affected widgets because
they will need to have their RemoteViews regenerated under the
new ID values.
Bug 10622506
Bug 10707117
Change-Id: Ie0007cdf809600b880d91989c00c3c3b8a4f988b
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OBB backup/ restore is no longer handled within the target app
process. This is done to avoid having to require that OBB-using
apps have full read/write permission for external storage.
The new OBB backup service is a new component running in the
same app as the already-existing shared storage backup agent.
The backup infrastructure delegates backup/restore of apps'
OBB contents to this component (because the system process
may not itself read/write external storage).
From the command line, OBB backup is enabled by using new
-obb / -noobb flags with adb backup. The default is noobb.
Finally, a couple of nit fixes:
- buffer-size mismatch between the writer and reader of chunked
file data has been corrected; now the reading side won't be
issuing an extra pipe read per chunk.
- bu now explicitly closes the transport socket fd after
adopting it. This was benign but triggered a logged
warning about leaked fds.
Bug: 6718844
Change-Id: Ie252494e2327e9ab97cf9ed87c298410a8618492
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This makes it easy to back up everything that belongs to 3rd party apps, but
nothing that comes with the system per se. If any system packages are
explicitly named on the command line they will be included in the backup
even if -nosystem was passed. So, for example, this will back up all 3rd
party apps as well as system settings, but nothing else belonging to
system-deployed apps:
adb backup -all -nosystem com.android.provider.settings
Bug 5361503
Change-Id: Iebe04b7d7027ca58b9f55e8eb7f219d6cca69269
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This way we don't have to muck with stdin/stdout just to get known
fds for data handling.
Change-Id: If87d19f4867c883a32d4e9afb91b915511b9df19
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Usage: adb restore [tarfilename]
Restores app data [and installs the apps if necessary from the backup
file] captured in a previous invocation of 'adb backup'. The user
must explicitly acknowledge the action on-device before it is allowed
to proceed; this prevents any "invisible" pushes of content from the
host to the device.
Known issues:
* The settings databases and wallpaper are saved/restored, but lots
of other system state is not yet captured in the full backup. This
means that for practical purposes this is usable for 3rd party
apps at present but not for full-system cloning/imaging.
Change-Id: I0c748b645845e7c9178e30bf142857861a64efd3
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Requires a parallel change in adb to support the new syntax.
Change-Id: Iff30cb247e424b6817af121c018f3c4e40b9f81a
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This is the basic infrastructure for pulling a full(*) backup of the
device's data over an adb(**) connection to the local device. The
basic process consists of these interacting pieces:
1. The framework's BackupManagerService, which coordinates the
collection of app data and routing to the destination.
2. A new framework-provided BackupAgent implementation called
FullBackupAgent, which is instantiated in the target applications'
processes in turn, and knows how to emit a datastream that contains
all of the app's saved data files.
3. A new shell-level program called "bu" that is used to bridge from
adb to the framework's Backup Manager.
4. adb itself, which now knows how to use 'bu' to kick off a backup
operation and pull the resulting data stream to the desktop host.
5. A system-provided application that verifies with the user that
an attempted backup/restore operation is in fact expected and to
be allowed.
The full agent implementation is not used during normal operation of
the delta-based app-customized remote backup process. Instead it's
used during user-confirmed *full* backup of applications and all their
data to a local destination, e.g. via the adb connection.
The output format is 'tar'. This makes it very easy for the end
user to examine the resulting dataset, e.g. for purpose of extracting
files for debug purposes; as well as making it easy to contemplate
adding things like a direct gzip stage to the data pipeline during
backup/restore. It also makes it convenient to construct and maintain
synthetic backup datasets for testing purposes.
Within the tar format, certain artificial conventions are used.
All files are stored within top-level directories according to
their semantic origin:
apps/pkgname/a/ : Application .apk file itself
apps/pkgname/obb/: The application's associated .obb containers
apps/pkgname/f/ : The subtree rooted at the getFilesDir() location
apps/pkgname/db/ : The subtree rooted at the getDatabasePath() parent
apps/pkgname/sp/ : The subtree rooted at the getSharedPrefsFile() parent
apps/pkgname/r/ : Files stored relative to the root of the app's file tree
apps/pkgname/c/ : Reserved for the app's getCacheDir() tree; not stored.
For each package, the first entry in the tar stream is a file called
"_manifest", nominally rooted at apps/pkgname. This file contains some
metadata about the package whose data is stored in the archive.
The contents of shared storage can optionally be included in the tar
stream. It is placed in the synthetic location:
shared/...
uid/gid are ignored; app uids are assigned at install time, and the
app's data is handled from within its own execution environment, so
will automatically have the app's correct uid.
Forward-locked .apk files are never backed up. System-partition
.apk files are not backed up unless they have been overridden by a
post-factory upgrade, in which case the current .apk *is* backed up --
i.e. the .apk that matches the on-disk data. The manifest preceding
each application's portion of the tar stream provides version numbers
and signature blocks for version checking, as well as an indication
of whether the restore logic should expect to install the .apk before
extracting the data.
System packages can designate their own full backup agents. This is
to manage things like the settings provider which (a) cannot be shut
down on the fly in order to do a clean snapshot of their file trees,
and (b) manage data that is not only irrelevant but actively hostile
to non-identical devices -- CDMA telephony settings would seriously
mess up a GSM device if emplaced there blind, for example.
When a full backup or restore is initiated from adb, the system will
present a confirmation UI that the user must explicitly respond to
within a short [~ 30 seconds] timeout. This is to avoid the
possibility of malicious desktop-side software secretly grabbing a copy
of all the user's data for nefarious purposes.
(*) The backup is not strictly a full mirror. In particular, the
settings database is not cloned; it is handled the same way that
it is in cloud backup/restore. This is because some settings
are actively destructive if cloned onto a different (or
especially a different-model) device: telephony settings and
AndroidID are good examples of this.
(**) On the framework side it doesn't care that it's adb; it just
sends the tar stream to a file descriptor. This can easily be
retargeted around whatever transport we might decide to use
in the future.
KNOWN ISSUES:
* the security UI is desperately ugly; no proper designs have yet
been done for it
* restore is not yet implemented
* shared storage backup is not yet implemented
* symlinks aren't yet handled, though some infrastructure for
dealing with them has been put in place.
Change-Id: Ia8347611e23b398af36ea22c36dff0a276b1ce91
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