Add a script to extract dependencies out of emerge.

Add a script to extract dependencies out of emerge.

BUG=none
TEST=run the script, observe the output

[sosa, 2010-06-24 05:00:52]

Sweet!  Thanks for uploading this.  We're moving to a convention of prepending
scripts in cros_utils with cros_$script_name so can you rename this?

I just have mostly nits, it looks good!

http://codereview.chromium.org/2871021/diff/1/2
File extract_deps (right):

http://codereview.chromium.org/2871021/diff/1/2#newcode37
extract_deps:37: if options.board != None:
if options.board:

http://codereview.chromium.org/2871021/diff/1/2#newcode52
extract_deps:52: # variant because it creates the db as root.
Could use subprocess.check_call('sudo rm -rf %s', temp_dir)

http://codereview.chromium.org/2871021/diff/1/2#newcode111
extract_deps:111: full_package_name = "%s/%s-%s" % (category, package_name,
version)
Consistent use of '' vs ""

http://codereview.chromium.org/2871021/diff/1/2#newcode113
extract_deps:113: try:
I think it's better practice to use if package_info i deps_map.keys() rather
than rely on exception control flow.

http://codereview.chromium.org/2871021/diff/1/2#newcode127
extract_deps:127: if indent == '':
if not indent

http://codereview.chromium.org/2871021/diff/1/2#newcode145
extract_deps:145: try:
Same comment as above.

http://codereview.chromium.org/2871021/diff/1/2#newcode169
extract_deps:169: parser = optparse.OptionParser(usage='usage: %prog [options]
package1 ...')
FYI I'll be adding gflags to the chroot if you are interested in using it rather
than optparse.

http://codereview.chromium.org/2871021/diff/1/2#newcode187
extract_deps:187: output_file.write(output)
output_file.close()

[piman, 2010-06-24 18:13:04]

Also renamed to cros_extract_deps

http://codereview.chromium.org/2871021/diff/1/2
File extract_deps (right):

http://codereview.chromium.org/2871021/diff/1/2#newcode37
extract_deps:37: if options.board != None:
On 2010/06/24 05:00:52, sosa wrote:
> if options.board:

Done.

http://codereview.chromium.org/2871021/diff/1/2#newcode52
extract_deps:52: # variant because it creates the db as root.
On 2010/06/24 05:00:52, sosa wrote:
> Could use subprocess.check_call('sudo rm -rf %s', temp_dir)

Done.

http://codereview.chromium.org/2871021/diff/1/2#newcode111
extract_deps:111: full_package_name = "%s/%s-%s" % (category, package_name,
version)
On 2010/06/24 05:00:52, sosa wrote:
> Consistent use of '' vs ""

Done.

http://codereview.chromium.org/2871021/diff/1/2#newcode113
extract_deps:113: try:
On 2010/06/24 05:00:52, sosa wrote:
> I think it's better practice to use if package_info i deps_map.keys() rather
> than rely on exception control flow.

Actually this is commonly preferred python style ("EAFP"):
http://docs.python.org/glossary.html#term-eafp

http://codereview.chromium.org/2871021/diff/1/2#newcode127
extract_deps:127: if indent == '':
On 2010/06/24 05:00:52, sosa wrote:
> if not indent

Done.

http://codereview.chromium.org/2871021/diff/1/2#newcode169
extract_deps:169: parser = optparse.OptionParser(usage='usage: %prog [options]
package1 ...')
On 2010/06/24 05:00:52, sosa wrote:
> FYI I'll be adding gflags to the chroot if you are interested in using it
rather
> than optparse.

honestly for having used both, optparse is much easier to use !

http://codereview.chromium.org/2871021/diff/1/2#newcode187
extract_deps:187: output_file.write(output)
On 2010/06/24 05:00:52, sosa wrote:
> output_file.close()

Done.

[sosa, 2010-06-24 18:16:44]

LGTM