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cli: upgrade sub-command #348
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Introducting `k3os upgrade` and hiding `k3os install` when `k3os.mode` == `local`: ``` $ k3os upgrade --help NAME: k3os upgrade - perform upgrades USAGE: k3os upgrade [command options] [arguments...] OPTIONS: --kernel upgrade the kernel [$K3OS_UPGRADE_KERNEL] --rootfs upgrade k3os+k3s [$K3OS_UPGRADE_ROOTFS] --remount pre-upgrade remount? [$K3OS_UPGRADE_REMOUNT] --sync post-upgrade sync? [$K3OS_UPGRADE_SYNC] --reboot post-upgrade reboot? [$K3OS_UPGRADE_REBOOT] --source value (default: "/k3os/system") [$K3OS_UPGRADE_SOURCE] --destination value (default: "/k3os/system") [$K3OS_UPGRADE_DESTINATION] ``` This enables the future system-upgrade-controller integration, or similar, that run from within the `rancher/k3os` container and mount the host's root to /host and then pass `/host/k3os/system` as destination. Invoking `k3os upgrade` from within a container and passing `--reboot`, assuming the destination is mutated, requires host IPC and PID namespaces along with it being privileged so that it may `chroot` to `/host` and then invoke `nsenter` into PID 1 to invoke `reboot`.
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Introducting
k3os upgradeand hidingk3os installwhenk3os.mode==local:This enables the future system-upgrade-controller integration, or similar, that run from within the
rancher/k3oscontainer and mount the host's root to /host and then pass/host/k3os/systemas destination.Invoking
k3os upgradefrom within a container and passing--reboot, assuming the destination is mutated, requires host IPC and PID namespaces along with it being privileged so that it may chroot to /host and then invokensenterinto PID 1 to invokereboot.