odb: fix writing to fake write streams #4594
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Our mempack ODB backend has no test coverage at all right now. Add a simple test suite to at least have some coverage of the most basic operations on the ODB.
In commit 7ec7aa4 (odb: assert on logic errors when writing objects, 2018-02-01), the check for whether we are trying to overflowing the fake stream buffer was changed from returning an error to raising an assert. The conversion forgot though that the logic around `assert`s are basically inverted. Previously, if the statement stream->written + len > steram->size evaluated to true, we would return a `-1`. Now we are asserting that this statement is true, and in case it is not we will raise an error. So the conversion to the `assert` in fact changed the behaviour to the complete opposite intention. Fix the assert by inverting its condition again and add a regression test.
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This is a regression, so it needs to be part of v0.27.0 |
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In commit 7ec7aa4 (odb: assert on logic errors when writing objects,
2018-02-01), the check for whether we are trying to overflowing the fake
stream buffer was changed from returning an error to raising an assert.
The conversion forgot though that the logic around
asserts arebasically inverted. Previously, if the statement
evaluated to true, we would return a
-1. Now we are asserting thatthis statement is true, and in case it is not we will raise an error. So
the conversion to the
assertin fact changed the behaviour to thecomplete opposite intention.
Fix the assert by inverting its condition again and add a regression
test.
/cc @ethomson