Add env variable to suppress the notice about deprecated SVN

Add env variable to suppress the notice about deprecated SVN

Also removed part of the message that encourages users to disable updates to
depot_tools. If the users do not enable updates, it prevents landing changes into
project repositories that depend on having latest version of the depot_tools, e.g.
https://codereview.chromium.org/1152823005/.

R=akuegel@chromium.org
TBR=maruel@chromium.org, iannucci@chromium.org
BUG=475320
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=295486

[Adrian Kuegel, 2015-06-02 09:33:18]

lgtm

[Sergiy Byelozyorov, 2015-06-02 09:33:48]

The CQ bit was checked by sergiyb@chromium.org

[commit-bot: I haz the power, 2015-06-02 09:33:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162153004/20001

[commit-bot: I haz the power, 2015-06-02 09:36:46]

Committed patchset #2 (id:20001) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=295486

[M-A Ruel, 2015-06-03 10:00:56]

I'm more interesting in where did you see this message happening and why you see
the need to shut it off at all.

I don't think this patch is a good idea to be honest.

[Adrian Kuegel, 2015-06-03 10:03:03]

On 2015/06/03 10:00:56, M-A Ruel wrote:
> I'm more interesting in where did you see this message happening and why you
see
> the need to shut it off at all.
> 
> I don't think this patch is a good idea to be honest.

The message was shown when running auto_deploy.py for CQ (which itself runs
gclient sync). This leads to alerts being send which are not actionable.

[M-A Ruel, 2015-06-03 10:06:32]

On 2015/06/03 10:03:03, Adrian Kuegel wrote:
> On 2015/06/03 10:00:56, M-A Ruel wrote:
> > I'm more interesting in where did you see this message happening and why you
> see
> > the need to shut it off at all.
> > 
> > I don't think this patch is a good idea to be honest.
> 
> The message was shown when running auto_deploy.py for CQ (which itself runs
> gclient sync). This leads to alerts being send which are not actionable.

Why not stop using svn in the tree that the CQ checks out instead?

https://code.google.com/p/chromium/issues/detail?id=475320 is real, I am going
to break you.

[Adrian Kuegel, 2015-06-03 10:13:53]

On 2015/06/03 10:06:32, M-A Ruel wrote:
> On 2015/06/03 10:03:03, Adrian Kuegel wrote:
> > On 2015/06/03 10:00:56, M-A Ruel wrote:
> > > I'm more interesting in where did you see this message happening and why
you
> > see
> > > the need to shut it off at all.
> > > 
> > > I don't think this patch is a good idea to be honest.
> > 
> > The message was shown when running auto_deploy.py for CQ (which itself runs
> > gclient sync). This leads to alerts being send which are not actionable.
> 
> Why not stop using svn in the tree that the CQ checks out instead?
> 
> https://code.google.com/p/chromium/issues/detail?id=475320 is real, I am going
> to break you.

We still have CQs for svn repos (tools and chromium_deps). I have already filed
a fixit bug to move chromium_deps to git, and for tools I am splitting it into
depot_tools and build, but we are not there yet. So this was meant as a quick
fix to get rid of the alerts.

[Sergiy Byelozyorov, 2015-06-03 10:46:59]

On 2015/06/03 10:13:53, Adrian Kuegel wrote:
> On 2015/06/03 10:06:32, M-A Ruel wrote:
> > On 2015/06/03 10:03:03, Adrian Kuegel wrote:
> > > On 2015/06/03 10:00:56, M-A Ruel wrote:
> > > > I'm more interesting in where did you see this message happening and why
> you
> > > see
> > > > the need to shut it off at all.
> > > > 
> > > > I don't think this patch is a good idea to be honest.
> > > 
> > > The message was shown when running auto_deploy.py for CQ (which itself
runs
> > > gclient sync). This leads to alerts being send which are not actionable.
> > 
> > Why not stop using svn in the tree that the CQ checks out instead?
> > 
> > https://code.google.com/p/chromium/issues/detail?id=475320 is real, I am
going
> > to break you.
> 
> We still have CQs for svn repos (tools and chromium_deps). I have already
filed
> a fixit bug to move chromium_deps to git, and for tools I am splitting it into
> depot_tools and build, but we are not there yet. So this was meant as a quick
> fix to get rid of the alerts.

We can either do that or add support for Git mirrors and git-cl-dcommit to CQ.
There are other many SVN repos that still have: build, build_internal and
depot_tools, chromium_deps, chrome_golo, blink. IMHO, we won't be able to fix
them all in a fixit.