Ad-hoc script to replay code coverage over the whole git history (used in https://github.com/zalando-incubator/kopf/pull/72)

_cov.sh

#!/bin/bash
set -eux

unset E2E  # e2e covers everything, but this is not a fair coverage.
first=981e664e39955f38d9a279af24ee5be77c7e9a3e
last=b6e3ec407f46d8db0f1c5c15fce41359ac76ebf1  # or upstream/master

# Master-only commits (i.e. where "master" branch was on merges).
# These ones are fast, since it walks "first parent" way only
while read -r rev; do
        git checkout master
        git reset --hard "$rev"

        rm -rf .coverage coverage.* htmlcov || true
        pytest --cov=kopf/ --cov-report=term --cov-branch || true
        codecov || true
done < <( git rev-list ${first}..${last} --reverse --first-parent )

# All the regular commits (those not failing) under their branch names!
# These ones are slow, since it is every commit, and e2e tests are slow'ish.
prev="${first}"
while read -r rev; do
    subject=$( git log --pretty=format:%s -1 "$rev" )
    if [[ "$subject" =~ "from "([^[:space:]]+) ]] ; then
        branch=$(basename "${BASH_REMATCH[1]}")

        while read -r subrev; do
            git branch --force "$branch" "$subrev"
            git checkout "$branch"

            rm -rf .coverage coverage.* htmlcov || true
            pytest --cov=kopf/ --cov-report=term --cov-branch || true
            codecov || true

            git checkout master
        done < <( git rev-list ${prev}..${rev} --reverse )

        git branch -D "$branch" || true
    fi

    prev="$rev"
done < <( git rev-list ${first}..${last} --reverse --first-parent )