Port mechanism explanation needed

[陈国凯]

I found no maintainers for port stlink and I wanted to take it if possible.
However, I am quite confused with the portfile mechanism of this port.

After reading the wiki, I know that this portfile specifies a Github Repo from which the port system obtains source code. While there are two problems left for me.

1. I tried editing portfile locally, changing the version number but port would only try fetching the source code from mirrors of MacPorts, rather than fetching directly from Github upstream. Is there a way for me to test my modifications locally? And how does the mirroring mechanism work? If one changed the portfile configuration and merged changes into port tree, would the mirrors be synced automatically?
2. I cannot figure out to whom the checksums belongs. I downloaded all 1.6.0 source code from Github release page while none of them matches the checksum specified in the portfile. How can I obtain the file with the expected checksum from Github (not from mirrors because I intend to make an upgrade afterwhile so that I should find a way to configure checksum)



Regards,
Xim