IPSers,
For the opensolaris May release the install team is integrating snap upgrade
which is comprised of a Boot Environment CLI, a C library to manage the BE's
and a glue library to convert Python calls -> C for interfacing with the C
library. This is the Live Upgrade replacement. See
http://www.opensolaris.org/os/project/caiman/Snap_Upgrade for more details.
My proposal is to modify pkg(1) to make use of the Snap Upgrade tools. So I am
in the process of modifying pkg(1) to support the following scenarios:
pkg image_update
- Take a snapshot of the BE before the attempted update
- Clone and mount the snapshot
- Update the clone
- If there are update errors:
~ destroy the snapshot, unmount and destroy clone
leaving the live BE untouched.
~ display appropriate note to user
- If there are no errors:
~ activate the clone but do not force a reboot
~ destroy the snapshot
~ display note to user that on the next reboot
the clone will be the live BE
pkg -R <dir> image_update
- Take a snapshot of the BE before the attempted update
- Update the BE mounted at <dir>
- If there are update errors:
~ clone the snapshot
~ unmount and destroy original BE
~ promote, rename and mount the clone at original BE
~ destroy the snapshot
~ display to user that the attempt failed
- If there are no errors:
destroy the snapshot
pkg install & uninstall ...
- Take a snapshot before the attempted install/uninstall
- install/uninstall to the live BE (see Note below)
- If there are install/uninstall errors:
~ clone the snapshot
~ mount it but do not activate.
~ display to user that the failed attempt
can be restored by activating the clone and rebooting
- If there are no installation errors:
destroy the snapshot.
pkg -R <dir> install @ uninstall ...
- Take a snapshot of the BE before the attempted install/uninstall
- install/uninstall to the BE mounted at <dir>
- If there are install/uninstall errors:
~ clone the snapshot
~ unmount and destroy original BE
~ promote, rename and mount the clone to original BE
~ destroy the snapshot
~ display to user that the failed attempt
can be restored by activating the clone and rebooting
- If there are no installation errors:
destroy the snapshot.
Note that after talking with Bart and others there still needs to be a
determination on whether an install or uninstall will require a reboot. This
proposal does not make any assumptions about requiring a reboot for the
install/uninstall operation to a live BE and does not propose to solve this
issue. It is providing generic support for pkg operation failures and recovery
methods.
Thanks
Tim
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