Kata-agent now will check if a device /dev/vd* with 'initdata' magic
number exists. If it exists, kata-agent will try to read it. Bytes 9~16
are the length of the compressed initdata toml in little endine.
Bytes starting from 17 is the compressed initdata.
The initdata image device layout looks like
0 8 16 16+length ... EOF
'initdata' length gzip(initdata toml) paddings
The initdata will be parsed and put as aa.toml, cdh.toml and
policy.rego to /run/confidential-containers/initdata.
When AgentPolicy is initialized, the default policy will be overwritten
by that.
When AA is to be launched, if initdata is once processed, the launch arg
will include --initdata parameter.
Also, if
/run/confidential-containers/initdata/aa.toml exists, the launch args
will include -c /run/confidential-containers/initdata/aa.toml.
When CDH is to be launched, if initdata is once processed, the launch
args will include -c /run/confidential-containers/initdata/cdh.toml
Signed-off-by: Xynnn007 <xynnn@linux.alibaba.com>
