[Buildroot] [PATCH 09/11] support/testing/infra: add log_file_path() function

[Thomas Petazzoni]

Some tests will need to grep through the build log to verify that some
features are working are expected. In order to allow them to open the
build log, we provide a new function called log_file_path(), which
returns the path to the log file if available.

We also use this function in open_log_file().

Note that open_log_file() cannot be used directly to grep through the
log file at the end of a build: because it opens in "a+" mode, it
greps starting from the end of the file.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
---
 support/testing/infra/__init__.py | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/support/testing/infra/__init__.py b/support/testing/infra/__init__.py
index 6392aa679b..aaee055ee6 100644
--- a/support/testing/infra/__init__.py
+++ b/support/testing/infra/__init__.py
@@ -10,14 +10,23 @@ ARTIFACTS_URL = "http://autobuild.buildroot.net/artefacts/"
 BASE_DIR = os.path.realpath(os.path.join(os.path.dirname(__file__), "../../.."))
 
 
+def log_file_path(builddir, stage, logtofile=True):
+    """Return path to log file"""
+    if logtofile:
+        return "{}-{}.log".format(builddir, stage)
+    else:
+        return None
+
+
 def open_log_file(builddir, stage, logtofile=True):
     """
     Open a file for logging and return its handler.
     If logtofile is True, returns sys.stdout. Otherwise opens a file
     with a suitable name in the build directory.
     """
-    if logtofile:
-        fhandle = open("{}-{}.log".format(builddir, stage), 'a+')
+    logf = log_file_path(builddir, stage, logtofile)
+    if logf:
+        fhandle = open(logf, 'a+')
     else:
         fhandle = sys.stdout
     return fhandle
-- 
2.25.4