code review 147170043: cmd/go: re-resolve and check vcs roots during go get -u

cmd/go: re-resolve and check vcs roots during go get -u

If you do 'go get -u rsc.io/pdf' and then rsc.io/pdf's redirect
changes to point somewhere else, after this CL a later
'go get -u rsc.io/pdf' will tell you that.

Fixes issue 8548.

[rsc, 2014-09-25 21:00:45]

Hello golang-codereviews@googlegroups.com (cc: adg, iant, n13m3y3r@gmail.com,
r),

I'd like you to review this change to
https://code.google.com/p/go/

[rsc, 2014-09-25 21:01:15]

If someone (Gustavo?) wants to give me the code for bzr and the test
invocation, I'll add it to this CL. Otherwise I am happy to mark this fixed
without bzr support.

[iant, 2014-09-26 15:15:04]

LGTM

[rsc, 2014-09-26 16:10:18]

*** Submitted as https://code.google.com/p/go/source/detail?r=cd24f5ff3db8 ***

cmd/go: re-resolve and check vcs roots during go get -u

If you do 'go get -u rsc.io/pdf' and then rsc.io/pdf's redirect
changes to point somewhere else, after this CL a later
'go get -u rsc.io/pdf' will tell you that.

Fixes issue 8548.

LGTM=iant
R=golang-codereviews, iant
CC=adg, golang-codereviews, n13m3y3r, r
https://codereview.appspot.com/147170043

[niemeyer, 2014-09-27 03:30:18]

On Thu, Sep 25, 2014 at 6:01 PM, Russ Cox <rsc@golang.org> wrote:
> If someone (Gustavo?) wants to give me the code for bzr and the test
> invocation, I'll add it to this CL. Otherwise I am happy to mark this fixed
> without bzr support.

Sorry, I didn't catch this in time. I'll have a look at it.