Faster checkout and cleanup of old builds.

Faster checkout and cleanup of old builds.

Change-Id: Id81fe4e7bd9cae7a51a45b6ea8a535c4ea9430f8

BUG=
TEST=Ran locally on top of previous build area.

[Mandeep Singh Baines, 2010-09-02 21:27:00]

LGTM

sosa@chromium.org (sosa@chromium.org) wrote:
> Reviewers: Mandeep Singh Baines,
> 
> Description:
> Faster checkout and cleanup of old builds.
> 
> Change-Id: Id81fe4e7bd9cae7a51a45b6ea8a535c4ea9430f8
> 
> BUG=
> TEST=Ran locally on top of previous build area.
> 
> Please review this at http://codereview.chromium.org/3337007/show
> 
> SVN Base: http://git.chromium.org/git/crosutils.git
> 
> Affected files:
>   M bin/cbuildbot.py
> 
> 
> Index: bin/cbuildbot.py
> diff --git a/bin/cbuildbot.py b/bin/cbuildbot.py
> index
86e498047b66b2a51248026e761ffd4fa51c74b6..cd9a3a5bebfefde70c2ba5afb9ab67da897c35a1
> 100755
> --- a/bin/cbuildbot.py
> +++ b/bin/cbuildbot.py
> @@ -47,9 +47,13 @@ def RepoSync(buildroot, rw_checkout=False,
> retries=_DEFAULT_RETRIES):
>    retries -- Number of retries to try before failing on the sync.
> 
>    """
> +  # Get the number of processors to use with repo sync.
> +  num_procs = int(RunCommand('grep -c processor /proc/cpuinfo'.split(),
> +                             print_cmd=False, redirect_stdout=True))
> +
>    while retries > 0:
>      try:
> -      RunCommand(['repo', 'sync'], cwd=buildroot)
> +      RunCommand(['repo', 'sync', '--jobs=%d' % (num_procs)],
> cwd=buildroot)
>        if rw_checkout:
>          # Always re-run in case of new git repos or repo sync
>          # failed in a previous run because of a forced Stop Build.
> @@ -238,7 +242,12 @@ def _Build(buildroot):
>    cwd = os.path.join(buildroot, 'src', 'scripts')
>    RunCommand(['./build_packages'], cwd=cwd, enter_chroot=True)
> 
> +def _WipeOldOutput(buildroot):
> +  RunCommand(['rm', '-rf', 'src/build/images'], cwd=buildroot)
> +
>  def _BuildImage(buildroot):
> +  _WipeOldOutput(buildroot)
> +
>    cwd = os.path.join(buildroot, 'src', 'scripts')
>    RunCommand(['./build_image', '--replace'], cwd=cwd, enter_chroot=True)
> 
> 
>