Container services can be started and stopped using the `system start`
and `system stop` commands. But there is no straightforward way for
users to check if the services were already started.
This PR adds a new `system status` command that shows wether the
container services are running or not.
The command only checks the status of the apiserver for now, but it
could be expanded in the future to show more details.
Fixes#117.
Replaces the `--install-dependencies` flag with the
`(enable/disable)-kernel-install` flag. If the flag is not passed - the
default behavior is prompting the user for a response.
Also adds a make target `install-kernel`
```
➜ bin/container system start
Verifying apiserver is running...
Installing base container filesystem...
No default kernel configured.
Install the recommended default kernel from [https://github.com/kata-containers/kata-containers/releases/download/3.17.0/kata-static-3.17.0-arm64.tar.xz]? [Y/n]: n
Please use the `container system kernel set --recommended` command to configure the default kernel
➜ bin/container system start --disable-kernel-install
Verifying apiserver is running...
➜ bin/container system start --enable-kernel-install
Verifying apiserver is running...
Installing kernel...
➜ bin/container system start --help
USAGE: container system start ... [--enable-kernel-install] [--disable-kernel-install]
...
--enable-kernel-install/--disable-kernel-install
Specify if the default kernel should be installed or not.
```
---------
Signed-off-by: Aditya Ramani <a_ramani@apple.com>
This change updates the UX when we install required dependencies at
first launch
### Fresh install - respond `y` to prompt
```
➜ bin/container system start
Verifying apiserver is running...
Installing base container filesystem...
No default kernel configured.
Install the recommended default kernel from [https://github.com/kata-containers/kata-containers/releases/download/3.17.0/kata-static-3.17.0-arm64.tar.xz]? [Y/n]: y
Installing kernel...
```
### Fresh install - respond `n` to prompt and then run the provided
command
```
➜ bin/container system start
Verifying apiserver is running...
Installing base container filesystem...
No default kernel configured.
Install the recommended default kernel from [https://github.com/kata-containers/kata-containers/releases/download/3.17.0/kata-static-3.17.0-arm64.tar.xz]? [Y/n]: n
Please use the `container system kernel set --recommended` command to configure the default kernel
➜ bin/container system kernel set --recommended
Installing the recommended kernel from https://github.com/kata-containers/kata-containers/releases/download/3.17.0/kata-static-3.17.0-arm64.tar.xz...
```
### Fresh install - respond `n` to prompt and then run a container
```
➜ bin/container system start
Verifying apiserver is running...
Installing base container filesystem...
No default kernel configured.
Install the recommended default kernel from [https://github.com/kata-containers/kata-containers/releases/download/3.17.0/kata-static-3.17.0-arm64.tar.xz]? [Y/n]: n
Please use the `container system kernel set --recommended` command to configure the default kernel
➜ bin/container run alpine uname
Error: notFound: "Default kernel not configured for architecture arm64. Please use the `container system kernel set` command to configure it
```
---------
Signed-off-by: Aditya Ramani <a_ramani@apple.com>
Aditya Ramani