path: root/contrib/
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2018-10-10contrib: add coverage-diff scriptDerrick Stolee
We have coverage targets in our Makefile for using gcov to display line coverage based on our test suite. The way I like to do it is to run: make coverage-test make coverage-report This leaves the repo in a state where every X.c file that was covered has an X.c.gcov file containing the coverage counts for every line, and "#####" at every uncovered line. There have been a few bugs in recent patches what would have been caught if the test suite covered those blocks (including a few of mine). I want to work towards a "sensible" amount of coverage on new topics. In my opinion, this means that any logic should be covered, but the 'die()' blocks covering very unlikely (or near-impossible) situations may not warrant coverage. It is important to not measure the coverage of the codebase by what old code is not covered. To help, I created the 'contrib/' script. After creating the coverage statistics at a version (say, 'topic') you can then run contrib/ base topic to see the lines added between 'base' and 'topic' that are not covered by the test suite. The output uses 'git blame -s' format so you can find the commits responsible and view the line numbers for quick access to the context, but trims leading tabs in the file contents to reduce output width. Signed-off-by: Derrick Stolee <> Signed-off-by: Junio C Hamano <>