Add code to handle errors in .gclient configuration files

Add code to handle errors in .gclient configuration files and output human readble information rather than a raw exception stack.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=17179

[SkyLined, 2009-05-28 21:16:20]

This should make life a bit easier for people who edit their .gclient files but
aren't very good at it.

[M-A Ruel, 2009-05-28 21:22:13]

http://codereview.chromium.org/113968/diff/1/2
File gclient.py (right):

http://codereview.chromium.org/113968/diff/1/2#newcode957
Line 957: for line in error_message:
You can just `raise Error(error_message)` instead, it's already taken care of in
the main.

[SkyLined, 2009-05-28 21:29:36]

> You can just `raise Error(error_message)` instead, it's already taken care of
in
> the main.
Done using raise Error('\n'.join(error_message))

[M-A Ruel, 2009-05-28 22:24:39]

lgtm