Difference between revisions of "Save and Restore"
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A general architecture for saving and restoring stuff from application data areas to the USB drive. | A general architecture for saving and restoring stuff from application data areas to the USB drive. | ||
− | + | Architecture: | |
* A binary C-based saverestoremgr service provides the ability to run a set of pre-installed scripts | * A binary C-based saverestoremgr service provides the ability to run a set of pre-installed scripts | ||
* The service calls the scripts with a small set of known arguments (e.g. 'save', 'restore', etc) | * The service calls the scripts with a small set of known arguments (e.g. 'save', 'restore', etc) | ||
+ | * The scripts are named according to the appId of the application that owns the data | ||
* The scripts are stored in a location that is only accessible by installing them as root (e.g. a signed app with a post-install script) | * The scripts are stored in a location that is only accessible by installing them as root (e.g. a signed app with a post-install script) | ||
* The service does not allow the execution of scripts outside of that location | * The service does not allow the execution of scripts outside of that location | ||
* Therefore, any script that is run by the service has been installed by a means that already had root access | * Therefore, any script that is run by the service has been installed by a means that already had root access | ||
− | |||
Features of the service: | Features of the service: | ||
Line 19: | Line 19: | ||
Implementation Decisions | Implementation Decisions | ||
− | * Where to store the | + | * Where to store the data |
− | + | ** Choose /media/internal/saverestore | |
− | |||
− | ** Choose / | ||
Situations To Persist Across | Situations To Persist Across | ||
Line 33: | Line 31: | ||
* /var/palm/data | * /var/palm/data | ||
* /media/internal/.app-storage | * /media/internal/.app-storage | ||
+ | * additional files in the application directory |
Revision as of 05:46, 21 March 2010
A general architecture for saving and restoring stuff from application data areas to the USB drive.
Architecture:
- A binary C-based saverestoremgr service provides the ability to run a set of pre-installed scripts
- The service calls the scripts with a small set of known arguments (e.g. 'save', 'restore', etc)
- The scripts are named according to the appId of the application that owns the data
- The scripts are stored in a location that is only accessible by installing them as root (e.g. a signed app with a post-install script)
- The service does not allow the execution of scripts outside of that location
- Therefore, any script that is run by the service has been installed by a means that already had root access
Features of the service:
- A method to list the current set of available scripts
- A method to call an individual script, or the set of all scripts, with a command method
- save
- restore
Implementation Decisions
- Where to store the data
- Choose /media/internal/saverestore
Situations To Persist Across
- Partial Erase
- Profile Reset (/var and /media/cryptofs are wiped, but /media/internal is retained)
Locations of Application Data
- /var/palm/data
- /media/internal/.app-storage
- additional files in the application directory