tree 69f41718573176c0a71e53f5391a67dece641487
parent 552f8db34257fd0182aa02302bc29db1aeef7370
author Russ Cox <rsc@golang.org> 1530303249 -0400
committer Russ Cox <rsc@golang.org> 1531201285 +0000

cmd/go/internal/modfetch: translate commit hashes to known tags during stat

For convenience on the command line, and also when translating
existing dependency management metadata, we accept commit hashes
or other references and translate them into proper semantic versions.
To date, that conversion has always used a pseudo-version.
But since we are talking to the code repo to look up the commit,
we might as well check it against known tags and use one of those
if possible. So for example

	go get rsc.io/quote@23179ee

used to add "rsc.io/quote v0.0.0-20180214005840-23179ee8a569" to go.mod.
But that commit is tagged v1.5.1, so now the same command records the version
as v1.5.1 instead.

Change-Id: I274c3ef914c758e6e0e9f8f6cfad23062600a918
Reviewed-on: https://go-review.googlesource.com/121857
Reviewed-by: Bryan C. Mills <bcmills@google.com>