Re: [Libguestfs] [PATCH libnbd v3 3/3] copy/copy-nbd-error.sh: Make this test non-stochastic

Because the test previously used error rates of 50%, it could sometimes "fail to fail". This is noticable if you run the test repeatedly: $ while make -C copy check TESTS=copy-nbd-error.sh >& /tmp/log ; do echo -n . ; done This now happens more often because of the larger requests made by the new multi-threaded loop, resulting in fewer calls to the error filter, so a greater chance that a series of 50% coin tosses will come up all heads in the test. Fix this by making the test non-stocastic. Fixes: commit 8d444b41d09a700c7ee6f9182a649f3f2d325abb --- copy/copy-nbd-error.sh | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/copy/copy-nbd-error.sh b/copy/copy-nbd-error.sh index 0088807f54..01524a890c 100755 --- a/copy/copy-nbd-error.sh +++ b/copy/copy-nbd-error.sh @@ -40,7 +40,7 @@ $VG nbdcopy -- [ nbdkit --exit-with-parent -v --filter=error pattern 5M \ # Failure to read should be fatal echo "Testing read failures on non-sparse source" $VG nbdcopy -- [ nbdkit --exit-with-parent -v --filter=error pattern 5M \ - error-pread-rate=0.5 ] null: && fail=1 + error-pread-rate=1 ] null: && fail=1 # However, reliable block status on a sparse image can avoid the need to read echo "Testing read failures on sparse source" @@ -51,7 +51,7 @@ $VG nbdcopy -- [ nbdkit --exit-with-parent -v --filter=error null 5M \ echo "Testing write data failures on arbitrary destination" $VG nbdcopy -- [ nbdkit --exit-with-parent -v pattern 5M ] \ [ nbdkit --exit-with-parent -v --filter=error --filter=noextents \ - memory 5M error-pwrite-rate=0.5 ] && fail=1 + memory 5M error-pwrite-rate=1 ] && fail=1 # However, writing zeroes can bypass the need for normal writes echo "Testing write data failures from sparse source"