[OE-core] [PATCH 2/2] scripts/oe-selftest: Use site.USER_SITE to run coverage configuration code for sub-process

[humberto.ibarra.lopez at intel.com]

From: Humberto Ibarra <humberto.ibarra.lopez at intel.com>

Coverage in oe-selftest currently requires to create or modify
a sitecustomize.py file according the coverage tool setup instructions
(http://coverage.readthedocs.org/). This file has to be located in
the system's python folder, which is not a good solution since this
folder is not accesible to non-privileged users.

The best solution so far is to create this file in the home directory.
This is implemented by creating the temporal file in the user site
default folder.

[Yocto #8930]

Signed-off-by: Humberto Ibarra <humberto.ibarra.lopez at intel.com>
---
 scripts/oe-selftest | 41 +++++++++++++++++++++++++++++++----------
 1 file changed, 31 insertions(+), 10 deletions(-)

diff --git a/scripts/oe-selftest b/scripts/oe-selftest
index f3865e4..3159d22 100755
--- a/scripts/oe-selftest
+++ b/scripts/oe-selftest
@@ -553,6 +553,7 @@ def main():
 
 def buildResultClass(args):
     """Build a Result Class to use in the testcase execution"""
+    import site
 
     class StampedResult(unittest.TextTestResult):
         """
@@ -568,26 +569,41 @@ def buildResultClass(args):
 
         def startTestRun(self):
             """ Setup coverage before running any testcase """
+
+            # variable holding the coverage configuration file allowing subprocess to be measured
+            self.coveragepth = None
+
+            # indicates the system if coverage is currently installed
+            self.coverage_installed = True
+
             if args.coverage or args.coverage_source or args.coverage_include or args.coverage_omit:
                 try:
                     # check if user can do coverage
                     import coverage
-                    log.info("Coverage is enabled")
-
-                    # In case the user has not set the variable COVERAGE_PROCESS_START,
-                    # create a default one and export it. The COVERAGE_PROCESS_START
-                    # value indicates where the coverage configuration file resides
-                    # More info on https://pypi.python.org/pypi/coverage
-                    if not os.environ.get('COVERAGE_PROCESS_START'):
-                        os.environ['COVERAGE_PROCESS_START'] = coverage_setup(args.run_tests, args.run_all_tests, args.coverage_source, args.coverage_include, args.coverage_omit)
-
-                    self.coverage_installed = True
                 except:
                     log.warn('\n'.join(["python coverage is not installed",
                         "Make sure your coverage takes into account sub-process",
                         "More info on https://pypi.python.org/pypi/coverage"]))
                     self.coverage_installed = False
 
+                if self.coverage_installed:
+                    log.info("Coverage is enabled")
+
+                # In case the user has not set the variable COVERAGE_PROCESS_START,
+                # create a default one and export it. The COVERAGE_PROCESS_START
+                # value indicates where the coverage configuration file resides
+                # More info on https://pypi.python.org/pypi/coverage
+                if not os.environ.get('COVERAGE_PROCESS_START'):
+                    os.environ['COVERAGE_PROCESS_START'] = coverage_setup(args.run_tests, args.run_all_tests, args.coverage_source, args.coverage_include, args.coverage_omit)
+
+                # Use default site.USER_SITE and write corresponding config file
+                site.ENABLE_USER_SITE = True
+                if not os.path.exists(site.USER_SITE):
+                    os.makedirs(site.USER_SITE)
+                self.coveragepth = os.path.join(site.USER_SITE, "coverage.pth")
+                with open(self.coveragepth, 'w') as cps:
+                    cps.write('import sys,site; sys.path.extend(site.getsitepackages()); import coverage; coverage.process_startup();')
+
         def stopTestRun(self):
             """ Report coverage data after the testcases are run """
 
@@ -601,6 +617,11 @@ def buildResultClass(args):
                 log.info("===============")
 
                 coverage_report()
+                # remove the pth file
+                try:
+                    os.remove(self.coveragepth)
+                except OSError:
+                    pass
 
     return StampedResult
 
-- 
1.9.1