How to lint all commits in a PR?

I’d like to integrate conventional-changelog-lint into my CI process. I can enforce a commit convention on “client side” using Husky as per docs, but how would I enforce the convention on CI?

Assuming that a PR is a list of commits that do not exist on master, then getting those commits is simple:

git log master..$(git symbolic-ref --short HEAD)

I am not sure though whats the best way to feed them to conventional-changelog-lint. Here is what I have ended up with for now:

for sha in $(git --no-pager rev-list master..$(git symbolic-ref --short HEAD)); do git cat-file commit $sha | sed '1,/^$/d' | conventional-changelog-lint; done

The problem with the latter is that it doesn’t exit if either of the validation fails.

[gajus]

conventional-changelog-lint --from=HEAD~$(git --no-pager rev-list master..HEAD --count)

another way to do it.

[marionebl]

I tested

conventional-changelog-lint --from=$TRAVIS_BRANCH --to=$TRAVIS_PULL_REQUEST_BRANCH

with success so far.