created test that actually writes data to a filesystem to really test disc_fill_checked

diff --git a/test/disc_filler_test.py b/test/disc_filler_test.py
new file mode 100755 (executable)
index 0000000..0dca339
--- /dev/null
+++ b/test/disc_filler_test.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+
+""" Test test_helpers.DiscFillChecker by actually writing lots of data to disc
+
+Indulge in the luxury of assuming we have python3 here ;-)
+
+.. codeauthor:: Christian Herdtweck, christian.herdtweck@intra2net.com
+"""
+
+from sys import stderr, argv as cmd_line_args
+from tempfile import NamedTemporaryFile
+from time import monotonic
+from os import fstatvfs
+
+from test_helpers import disc_fill_checked
+
+def main(test_dir):
+    """ Main function, called when running file as script """
+
+    with disc_fill_checked():
+        fill_disc(test_dir)
+
+
+def fill_disc(test_dir):
+    """ write data to file in given directory """
+
+    source = '/dev/random'
+    chunk_size = 1024
+    temp_file_prefix = 'pyi2n_disc_fill_test_'
+    print_interval = 1
+
+    with open(source, 'rb') as read_handle:
+        with NamedTemporaryFile(dir=test_dir, prefix=temp_file_prefix) \
+                as write_handle:
+            os_handle = write_handle.fileno()
+            print('copying data from {0} to {1}...'.format(source,
+                                                           write_handle.name))
+            print_fs_stats(os_handle)
+            last_print = monotonic()
+            while True:
+                write_handle.write(read_handle.read(chunk_size))
+                if monotonic() - last_print > print_interval:
+                    print_fs_stats(os_handle)
+                    last_print = monotonic()
+
+
+def print_fs_stats(os_handle):
+    print(fstatvfs(os_handle))
+
+
+if __name__ == '__main__':
+    if len(cmd_line_args) != 2:
+        print('Need to known which dir I am allowed to abuse', file=stderr)
+        exit(1)
+    main(cmd_line_args[1])