tree 33ae402739a2938568837774c5ac6b114ef82078
parent 9ee669d95d3cd27ea0ee2b5bea7c00c481cb241e
author Daniel Erat <derat@chromium.org> 1505264421 -0700
committer chrome-bot <chrome-bot@chromium.org> 1505453101 -0700

tast: Check dependencies before building tests.

When run with -build (currently the default), "tast run ..."
rebuilds the test executable. To do this, it relies on the
executable's dependencies' source code having already been
checked out as a side effect of the dependencies having
previously been built by Portage. (/usr/lib/gopath is used
by default, although this change adds a -sysgopath flag that
can be used to specify a different workspace.)

This change makes tast use Portage's equery command to check
that the test package's dependencies are installed before
performing the build. If they aren't, a command that can be
used to install them is printed. Checking dependencies can
take close to a second; -checkdeps=false can be passed to
skip the check.

BUG=chromium:737628
TEST=unit tests pass; also manually verified that for both
     local and remote tests, an error is printed if
     dependencies are missing and that the check is skipped
     when -checkdeps=false is passed

Change-Id: I532821307e638f27b7dfe013e840b371c63b7547
Reviewed-on: https://chromium-review.googlesource.com/664379
Commit-Ready: Dan Erat <derat@chromium.org>
Tested-by: Dan Erat <derat@chromium.org>
Reviewed-by: Jason Clinton <jclinton@chromium.org>