As of today, everything fails on CI with:
```
Run common/travis/fetch_upstream.sh
Fetching upstream...
fatal: remote error:
The unauthenticated git protocol on port 9418 is no longer supported.
Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information.
Error: Process completed with exit code 128.
```
Switching `git://` to `https://` should fix this.
GitHub Action and fetch_upstream.sh script limits fetch depth to 200.
With such depth, should the PR was based on very old tree, we couldn't
find the merge-base to diff again.
In theory, we could replace actions/checkout and fetch_upstream.sh to
fetch more than 200 depth. However, there isn't much gain from such
change and it will increase the time to fetch upstream for all PR.
Arguably, such problematic PR couldn't be built because other steps
would build changed packages' dependencies, too.
Let's complain and exit early instead.
* CI will stop whenever a step is failing.
* We always want to enforce commit message lint
* `xlint` is reporting some false positive for license with " WITH "
Let's make the lint-commits part of xlint.sh
The HEAD given by GitHub Action is always non-fast-forward merge commit.
In the next change, lint-commits will use the tip from
"changed_templates.sh".
Let pick the correct tip for interrogation.
- Remove .travis.yml, common/travis/docker.sh.
- Change references to travis to be more generic.
- Manual.md: Orient against using CI logs in broken= or nocross=.
From b881f32687 (travis/changed_templates: filter by git itself,
2020-05-23), we replaced git-diff(1) with git-diff-tree(1).
The change wasn't equivalence, though.
We used to compare between merge-base of FETCH_HEAD and HEAD.
From that commit, we started to compare FETCH_HEAD and HEAD instead.
Fix them by changing left tree-ish to the merge-base.
- Use plumbing git-diff-tree(1) instead of porcelain git-diff(1)
- Disable rename detection, gains some speed up and fix missing template
with name-status Renamed and Copied.
- Use "--diff-filter" to filter by Git itself.
- Tell Git to only check 'srcpkgs/*/template', this glob will only look
into template file inside direct sub-directory of srcpkgs
- With all of those options, we don't need a grep and a pipe
