| 240c7d2d1fb2944ee6a6f1dee41c7bbd766f8f0d |
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04-Oct-2011 |
Christopher Tate <ctate@google.com> |
Add -nosystem flag to adb backup
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
/frameworks/base/cmds/bu/src/com/android/commands/bu/Backup.java
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| e26e96bcc19b1cdac690d21b3986f09a502739e6 |
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11-Jun-2011 |
Christopher Tate <ctate@google.com> |
Pass the data fd number as a command line argument to 'bu'
This way we don't have to muck with stdin/stdout just to get known
fds for data handling.
Change-Id: If87d19f4867c883a32d4e9afb91b915511b9df19
/frameworks/base/cmds/bu/src/com/android/commands/bu/Backup.java
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| 75a99709accef8cf221fd436d646727e7c8dd1f1 |
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19-May-2011 |
Christopher Tate <ctate@google.com> |
Restore from a previous full backup's tarfile
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
/frameworks/base/cmds/bu/src/com/android/commands/bu/Backup.java
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| 14a2935809e73a9d824888dc837f2f017100fd26 |
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17-May-2011 |
Christopher Tate <ctate@google.com> |
bu - add handling for both 'backup' and 'restore' modes
Requires a parallel change in adb to support the new syntax.
Change-Id: Iff30cb247e424b6817af121c018f3c4e40b9f81a
/frameworks/base/cmds/bu/src/com/android/commands/bu/Backup.java
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| 4a627c71ff53a4fca1f961f4b1dcc0461df18a06 |
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01-Apr-2011 |
Christopher Tate <ctate@google.com> |
Full local backup infrastructure
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
/frameworks/base/cmds/bu/src/com/android/commands/bu/Backup.java
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