This is an experiment. The code is structured as follows:
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fetch.sh: contains the code to fetch commits until there is a common ancestor between two branches, and only those commits necessary to reach this common ancestor.
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test.sh: contains the test runner and sources the tests found in the tests/ folder. You can run it like so:
./test.sh: runs all the tests until the first one that fails../test.sh <N>: runs only test number ../test.sh --all: runs all tests regardless of whether one fails.
Current status:
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There are 2 failing tests: when one branch is ancestor of the other with 1 commit of difference and the remote HEAD points to the oldest branch.
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When fetching diverged branches, the current script fails to obtain commits until a common ancestor is reached. This is currently not considered a bug given that the purpose of the script, for now, is to act only when one branch is ancestor of the other, and fail with an error when branches diverge.