resiliencytest: Truncate the portion of log that goes into erp5.

  The full log is available on suite.log at the erp5testnode anyway.

slapos/resiliencytest/__init__.py

@@ -268,7 +268,20 @@ def runUnitTest():
       error_count = 1
 
     test_duration = time.time() - start_time
-    test_line.stop(stdout=open(fname).read(),
+    max_size = 4096
+    fsize = os.stat(fname).st_size
+    with open(fname) as f:
+      if fsize <= max_size:
+        stdout = f.read()
+      else:
+        # Read only 2048 bytes from the file. The whole
+        # file will be available on the server.
+        stdout = f.read(2048)
+        stdout += "\n[...] File truncated\n"
+        f.seek(-2048, os.SEEK_END)
+        stdout += f.read()
+
+    test_line.stop(stdout=stdout,
                     test_count=1,
                     error_count=error_count,
                     duration=test_duration)

[Romain Courteaud]

There are errors io.UnsupportedOperation: can't do nonzero end-relative seeks in test result.

From python 3 documentation: in text files (those opened without a b in the mode string), only seeks relative to the beginning of the file are allowed.

A easy, and probably enough, fix could be to open the file with the mode 'rb'

[Jérome Perrin]

Yes, this sounds like the good fix

[Jérome Perrin]

don't forget to also change this not to mix bytes and str

        stdout += b"\n[...] File truncated\n"