Add ability to download using newest image from zip url.

Add ability to download using newest image from zip url.

This changes the behavior of ctest to try to grab the latest zip from the zip web pages if it can't use the latest link (due to IOError or none provided).  It assumes they have an Apache server and they reference images using version->ChromeOS-version-.*.zip) for each board/channel.

Change-Id: I4ee075db7afd58c8d08f59aca2e69b5bab5ff5e9

BUG=7675
TEST=Ran it with -l "http://Doesnotexist" and also without a -l option.  Added new unittests to test and ran them as well.

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=af62e73

[scottz, 2010-10-12 21:18:15]

http://codereview.chromium.org/3659002/diff/2001/3001
File bin/ctest.py (right):

http://codereview.chromium.org/3659002/diff/2001/3001#newcode29
bin/ctest.py:29: 'ChromeOS-\d+\.\d+\.\d+\.\d+-.*\.zip'
Is there something you wanted to do with these? If not they should just be a
part of the doc string.

http://codereview.chromium.org/3659002/diff/2001/3001#newcode33
bin/ctest.py:33: self.regex = regex
Minor optimization, compile the regex here?

http://codereview.chromium.org/3659002/diff/2001/3002
File bin/ctest_unittest.py (right):

http://codereview.chromium.org/3659002/diff/2001/3002#newcode214
bin/ctest_unittest.py:214: self.test_regex = 'testlink\d+.*'
Any reason not to test on a name we know we can expect to see?

[sosa, 2010-10-12 21:38:25]

Thanks for the quick review, PTAL

http://codereview.chromium.org/3659002/diff/2001/3001
File bin/ctest.py (right):

http://codereview.chromium.org/3659002/diff/2001/3001#newcode29
bin/ctest.py:29: 'ChromeOS-\d+\.\d+\.\d+\.\d+-.*\.zip'
On 2010/10/12 21:18:15, scottz wrote:
> Is there something you wanted to do with these? If not they should just be a
> part of the doc string.

Removed.  Had them as a place holder for myself.

http://codereview.chromium.org/3659002/diff/2001/3001#newcode33
bin/ctest.py:33: self.regex = regex
On 2010/10/12 21:18:15, scottz wrote:
> Minor optimization, compile the regex here?

Done.

http://codereview.chromium.org/3659002/diff/2001/3002
File bin/ctest_unittest.py (right):

http://codereview.chromium.org/3659002/diff/2001/3002#newcode214
bin/ctest_unittest.py:214: self.test_regex = 'testlink\d+.*'
On 2010/10/12 21:18:15, scottz wrote:
> Any reason not to test on a name we know we can expect to see?

No, not really.  Done here for version and in other test for
ChromeOS-{version}-hash.zip

[scottz-goog, 2010-10-12 22:06:06]

LGTM