RFR JDK-8217527: jmod hash does not work if --hash-module does not include the target module

[Alan Bateman]

On 17/07/2020 19:45, Mandy Chung wrote:
> Webrev:
> http://cr.openjdk.java.net/~mchung/jdk16/webrevs/8217527/webrev.00/
>
> The current implementation jmod hash ignores the target jmod file if 
> specified.
>
> Therefore even B requires A:
>
> $ jmod hash --hash-module B --module-path jmods jmods/A.jmod
>
> This jmod hash command finds no module to record hashes.
>
> The patch fixes jmod hash such that if the target jmod file is 
> specified, it is the module to record the hashes and it must have no 
> outgoing read edges to the modules on the application path. If the 
> target jmod file is not specified, jmod hash will find from the 
> resolved modules that have no outgoing edges and match the given 
> pattern to record hashes of the modules requiring it directly or 
> indirectly.
>
> jmod hash command should also report no hash recorded if no module 
> found to record hashes.
This looks good good, and good to have it report when it doesn't record 
any hashes.

-Alan