tree f8fc564a40e5886c74062d6be751ca4c2769721c
parent 0758d2f1d61288c83282749d2b36958d2c289e7f
author Shawn O. Pearce <sop@google.com> 1224788332 -0700
committer Shawn O. Pearce <sop@google.com> 1224798208 -0700

Teach repo how to download changes to the local checkout

Now `repo download . 1402` would download the change numbered 1402
into the current project and check it out for the user, using a
detached HEAD.  `repo sync .` would back out of the change and
return to the upstream version.

Multiple projects can be fetched at once by listing them out on
the command line as different arguments.

Individual patch sets can be selected by adding a '/n' to indicate
the n-th patch set should be downloaded instead of the default of
patch set 1.

Signed-off-by: Shawn O. Pearce <sop@google.com>