Port chromium landmines script.

Port chromium landmines script.

This runs the landmines script as a gclient hook. It can
as such be used to clobber local checkouts when hooks are
run locally.

It is a softer version than chromium's landmines script, as
it only deletes directories in the output directory due
to compatibility with MSVS which has "build" hardcoded as
output directory in several places.

BUG=chromium:403263
LOG=n

Committed: https://crrev.com/89731cfbf8ca6441594e9d64a0fa11a063d70800
Cr-Commit-Position: refs/heads/master@{#26831}

[Michael Achenbach, 2015-02-24 15:30:26]

machenbach@chromium.org changed reviewers:
+ jkummerow@chromium.org, jochen@chromium.org, tandrii@chromium.org

[Michael Achenbach, 2015-02-24 15:30:27]

PTAL. The landmines script is c/p from chromium's current
landmines script. All differences are highlighted in comments
below. The gyp env setup method is a copy of our own old
setup method.

https://codereview.chromium.org/955463002/diff/20001/build/landmines.py
File build/landmines.py (right):

https://codereview.chromium.org/955463002/diff/20001/build/landmines.py#newco...
build/landmines.py:55: elif build_tool in ['msvs', 'vs', 'ib']:
This is different to chromium's landmines script which has no default anymore
for 'msvs', 'vs'.

https://codereview.chromium.org/955463002/diff/20001/build/landmines.py#newco...
build/landmines.py:163: if os.path.isdir(path) and
re.search(r"(?:[Rr]elease)|(?:[Dd]ebug)", f):
This is different to chromium's landmines script. Only delete directories that
are called *release* or *debug*.

[jochen (gone - plz use gerrit), 2015-02-24 15:45:23]

https://codereview.chromium.org/955463002/diff/20001/build/landmines.py
File build/landmines.py (right):

https://codereview.chromium.org/955463002/diff/20001/build/landmines.py#newco...
build/landmines.py:163: if os.path.isdir(path) and
re.search(r"(?:[Rr]elease)|(?:[Dd]ebug)", f):
On 2015/02/24 at 15:30:27, Michael Achenbach wrote:
> This is different to chromium's landmines script. Only delete directories that
are called *release* or *debug*.

what about optdebug for developer checkouts?

[Michael Achenbach, 2015-02-24 16:29:32]

https://codereview.chromium.org/955463002/diff/20001/build/landmines.py
File build/landmines.py (right):

https://codereview.chromium.org/955463002/diff/20001/build/landmines.py#newco...
build/landmines.py:163: if os.path.isdir(path) and
re.search(r"(?:[Rr]elease)|(?:[Dd]ebug)", f):
On 2015/02/24 15:45:22, jochen (slow) wrote:
> On 2015/02/24 at 15:30:27, Michael Achenbach wrote:
> > This is different to chromium's landmines script. Only delete directories
that
> are called *release* or *debug*.
> 
> what about optdebug for developer checkouts?

re.search should return true for that as well. It'll e.g. delete also
"ia32.release", "Debug_x64", etc.

[jochen (gone - plz use gerrit), 2015-02-24 16:38:39]

ok, lgtm

[Michael Achenbach, 2015-02-24 16:39:30]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2015-02-24 16:41:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/955463002/20001

[commit-bot: I haz the power, 2015-02-24 16:57:45]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-24 16:57:57]

Patchset 2 (id:??) landed as
https://crrev.com/89731cfbf8ca6441594e9d64a0fa11a063d70800
Cr-Commit-Position: refs/heads/master@{#26831}