cmd: Modify the assignment of parameters

[zhouhao3]

This modification can avoid the absence of default values.

Signed-off-by: zhouhao [email protected]

[xiekeyang]

I'd rather to set value at statement of v, like,

v := bundleCmd{root : context.rootfs, ref : context.ref }

And, I think if condition might be necessary for those who has no default value.

[vbatts]

what happens if those variables are not set? will it panic?

[xiekeyang]

@vbatts

what happens if those variables are not set? will it panic?

it doesn't cause panic. The value should be empty for string type, false for bool type, and so on.

[zhouhao3]

And, I think if condition might be necessary for those who has no default value.

@xiekeyang The if statement performs only the assignment action, and the previous assignment has been repeated, so I do not think so.

[xiekeyang]

LGTM

[coolljt0725]

LGTM