[Buildroot] [PATCH v3 1/9] testing/infra/builder: call make with empty env

[Ricardo Martincoski <ricardo.martincoski@gmail.com>]

From: Ricardo Martincoski <ricardo.martincoski@gmail.com>

Use an empty environment when calling make, but import PATH so the
buildroot tree under test can find libraries from the host machine.

Since environment variables are now ignored, move the handling of
BR2_DL_DIR to the defconfig to keep the current precedence of -d:

    BR2_DL_DIR  | -d DIR   | test downloads   | BR downloads
    ------------+----------+------------------+--------------
    unset       | unset    | [error]          | [error]
    unset       | set      | in $(DIR)        | in $(DIR)
    set         | unset    | in $(BR2_DL_DIR) | in $(BR2_DL_DIR)
    set         | set      | in $(DIR)        | in $(DIR)

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
---
Changes v2 -> v3:
  - new patch
  - search for "start with an empty environment" in
    http://patchwork.ozlabs.org/patch/806159/
---
 support/testing/infra/basetest.py | 1 +
 support/testing/infra/builder.py  | 7 +++++--
 support/testing/run-tests         | 1 -
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/support/testing/infra/basetest.py b/support/testing/infra/basetest.py
index 754922692c..b85e8627fd 100644
--- a/support/testing/infra/basetest.py
+++ b/support/testing/infra/basetest.py
@@ -42,6 +42,7 @@ class BRTest(unittest.TestCase):
         self.testname = self.__class__.__name__
         self.builddir = self.outputdir and os.path.join(self.outputdir, self.testname)
         self.emulator = None
+        self.config += '\nBR2_DL_DIR="{}"\n'.format(self.downloaddir)
         self.config += "\nBR2_JLEVEL={}\n".format(self.jlevel)
 
     def show_msg(self, msg):
diff --git a/support/testing/infra/builder.py b/support/testing/infra/builder.py
index 7512339ae1..36f4801a2d 100644
--- a/support/testing/infra/builder.py
+++ b/support/testing/infra/builder.py
@@ -24,15 +24,18 @@ class Builder(object):
                            "> end defconfig\n")
         self.logfile.flush()
 
+        env = {"PATH": os.environ["PATH"]}
         cmd = ["make",
                "O={}".format(self.builddir),
                "olddefconfig"]
-        ret = subprocess.call(cmd, stdout=self.logfile, stderr=self.logfile)
+        ret = subprocess.call(cmd, stdout=self.logfile, stderr=self.logfile,
+                              env=env)
         if ret != 0:
             raise SystemError("Cannot olddefconfig")
 
         cmd = ["make", "-C", self.builddir]
-        ret = subprocess.call(cmd, stdout=self.logfile, stderr=self.logfile)
+        ret = subprocess.call(cmd, stdout=self.logfile, stderr=self.logfile,
+                              env=env)
         if ret != 0:
             raise SystemError("Build failed")
 
diff --git a/support/testing/run-tests b/support/testing/run-tests
index f8cee09ed1..270e78cff7 100755
--- a/support/testing/run-tests
+++ b/support/testing/run-tests
@@ -58,7 +58,6 @@ def main():
             return 1
 
     BRTest.downloaddir = os.path.abspath(args.download)
-    os.putenv("BR2_DL_DIR", BRTest.downloaddir)
 
     if args.output is None:
         print "Missing output directory, please use -o/--output"
-- 
2.14.2