Add placeholder git hooks

Add placeholder git hooks.

This is a bit of future-proofing.  The git hooks in depot_tools/git-templates/hooks all try to forward to build/git-hooks.

Currently, the only actual hook we have is in src/build/git-hooks/pre-commit, which (usefully) makes sure no one inadvertently commits a submodule change.  If we want to add more git hooks, we can simply commit them to build/git-hooks, rather than asking everyone to modify .git/hooks in their checkout.

NOTRY=true

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=195336

[szager1, 2013-04-16 20:46:53]

Should probably land this first:

https://codereview.chromium.org/14139020

[M-A Ruel, 2013-04-16 20:52:36]

https://codereview.chromium.org/14230012/diff/1/gclient_scm.py
File gclient_scm.py (right):

https://codereview.chromium.org/14230012/diff/1/gclient_scm.py#newcode655
gclient_scm.py:655: template_path = os.path.join(os.path.dirname(__file__),
'git-templates')
Make this a global ALL_CAPS varaible at the top of the file, so the change of a
os.chdir() happening in between is lowered.
Also use os.path.abspath() since __file__ could be the naked basename.

[szager1, 2013-04-16 21:01:25]

https://codereview.chromium.org/14230012/diff/1/gclient_scm.py
File gclient_scm.py (right):

https://codereview.chromium.org/14230012/diff/1/gclient_scm.py#newcode655
gclient_scm.py:655: template_path = os.path.join(os.path.dirname(__file__),
'git-templates')
On 2013/04/16 20:52:37, Marc-Antoine Ruel wrote:
> Make this a global ALL_CAPS varaible at the top of the file, so the change of
a
> os.chdir() happening in between is lowered.
> Also use os.path.abspath() since __file__ could be the naked basename.

Done.

[M-A Ruel, 2013-04-19 19:28:58]

https://codereview.chromium.org/14230012/diff/6001/gclient_scm.py
File gclient_scm.py (right):

https://codereview.chromium.org/14230012/diff/6001/gclient_scm.py#newcode19
gclient_scm.py:19: THIS_FILE_PATH = __file__
THIS_FILE_PATH = os.path.abspath(__file__)

because it is the abspath() that is cwd sensitive, not __file__ itself.

[szager, 2013-04-19 20:12:13]

https://codereview.chromium.org/14230012/diff/6001/gclient_scm.py
File gclient_scm.py (right):

https://codereview.chromium.org/14230012/diff/6001/gclient_scm.py#newcode19
gclient_scm.py:19: THIS_FILE_PATH = __file__
On 2013/04/19 19:28:58, Marc-Antoine Ruel wrote:
> THIS_FILE_PATH = os.path.abspath(__file__)
> 
> because it is the abspath() that is cwd sensitive, not __file__ itself.

Done.

[M-A Ruel, 2013-04-19 20:14:57]

lgtm

It'd be nice if it were documented somewhere in the (incredibly outdated)
gclient doc. As you mind.

[commit-bot: I haz the power, 2013-04-19 23:26:58]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/szager@chromium.org/14230012/10001

[commit-bot: I haz the power, 2013-04-19 23:30:17]

Change committed as 195336