feat(ci): Add codespell to Makefile and GitHub Actions (#3996)

* feat(ci): Add codespell to Makefile and GitHub Actions

This is a followup from
https://github.com/open-telemetry/opentelemetry-go/pull/3980 to add the
automation for checking for code spelling errors to a different PR.

[Codespell][] makes use of the `.codespellrc` file automatically as a config
file for convenience. The configuration file specifies directories and
flags to pass to `codespell`. Codespell also makes use of the
`.codespellignore` file to ignore certain word spellings.

There is a new section in `Makefile` for installing python tooling.
It is similar to how the go tools are installed. It sets up a virtualenv
in `venv `and installs python tooling there if it hasn't been installed
yet.

The new [codespell workflow][] will run in pull requests to annotate
misspelled words. It is set up to only warn the user with annotations in
the pull request if there are typos, but we can fail the pull request as
well if we want to by deleting the [warn_only][] key.

[codespell]: https://github.com/codespell-project/codespell
[codespell workflow]: https://github.com/codespell-project/actions-codespell
[warn_only]: https://github.com/codespell-project/actions-codespell#parameter-only_warn

* Use docker to run python and codespell

Since this is a Go project, having a dependency on python seemed
disconcerting. So, docker is used to create a virtual environment
with a python image and also run the tools that were installed.

* Remove wording on requirement for python

* Apply suggestions from code review

Co-authored-by: Damien Mathieu <42@dmathieu.com>

* Pin versions into requirements.txt

* Pin version in requirements.txt

* Fix typo in license

* Revert typo fix on deleted file

* Update .github/workflows/codespell.yaml

Co-authored-by: Robert Pająk <pellared@hotmail.com>

* Update codespell.yaml

* Update codespell.yaml

---------

Co-authored-by: Chester Cheung <cheung.zhy.csu@gmail.com>
Co-authored-by: Damien Mathieu <42@dmathieu.com>
Co-authored-by: Robert Pająk <pellared@hotmail.com>
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

.codespellignore

@@ -0,0 +1,5 @@
+ot
+fo
+te
+collison
+consequentially

.codespellrc

@@ -0,0 +1,10 @@
+# https://github.com/codespell-project/codespell
+[codespell]
+builtin = clear,rare,informal
+check-filenames =
+check-hidden =
+ignore-words = .codespellignore
+interactive = 1
+skip = .git,go.mod,go.sum,semconv,venv,.tools
+uri-ignore-words-list = *
+write =

.github/workflows/codespell.yaml

@@ -0,0 +1,14 @@
+name: codespell
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+jobs:
+  codespell:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v3
+      - name: Codespell
+        run: make codespell

.gitignore

@@ -2,6 +2,7 @@
 Thumbs.db
 
 .tools/
+venv/
 .idea/
 .vscode/
 *.iml

.golangci.yml

@@ -113,7 +113,7 @@ linters-settings:
       - name: constant-logical-expr
         disabled: false
       # https://github.com/mgechev/revive/blob/master/RULES_DESCRIPTIONS.md#context-as-argument
-      # TODO (#3372) reenable linter when it is compatible. https://github.com/golangci/golangci-lint/issues/3280
+      # TODO (#3372) re-enable linter when it is compatible. https://github.com/golangci/golangci-lint/issues/3280
       - name: context-as-argument
         disabled: true
         arguments:

CONTRIBUTING.md

@@ -28,6 +28,11 @@ precommit` - the `precommit` target is the default).
 The `precommit` target also fixes the formatting of the code and
 checks the status of the go module files.
 
+Additionally, there is a `codespell` target that checks for common
+typos in the code. It is not run by default, but you can run it
+manually with `make codespell`. It will set up a virtual environment
+in `venv` and install `codespell` there.
+
 If after running `make precommit` the output of `git status` contains
 `nothing to commit, working tree clean` then it means that everything
 is up-to-date and properly formatted.

Makefile

@@ -74,6 +74,39 @@ $(TOOLS)/gojq: PACKAGE=github.com/itchyny/gojq/cmd/gojq
 .PHONY: tools
 tools: $(CROSSLINK) $(DBOTCONF) $(GOLANGCI_LINT) $(MISSPELL) $(GOCOVMERGE) $(STRINGER) $(PORTO) $(GOJQ) $(SEMCONVGEN) $(MULTIMOD) $(SEMCONVKIT)
 
+# Virtualized python tools via docker
+
+# The directory where the virtual environment is created.
+VENVDIR := venv
+
+# The directory where the python tools are installed.
+PYTOOLS := $(VENVDIR)/bin
+
+# The pip executable in the virtual environment.
+PIP := $(PYTOOLS)/pip
+
+# The directory in the docker image where the current directory is mounted.
+WORKDIR := /workdir
+
+# The python image to use for the virtual environment.
+PYTHONIMAGE := python:3.11.3-slim-bullseye
+
+# Run the python image with the current directory mounted.
+DOCKERPY := docker run --rm -v "$(CURDIR):$(WORKDIR)" -w $(WORKDIR) $(PYTHONIMAGE)
+
+# Create a virtual environment for Python tools.
+$(PYTOOLS):
+# The `--upgrade` flag is needed to ensure that the virtual environment is
+# created with the latest pip version.
+	@$(DOCKERPY) bash -c "python3 -m venv $(VENVDIR) && $(PIP) install --upgrade pip"
+
+# Install python packages into the virtual environment.
+$(PYTOOLS)/%: | $(PYTOOLS)
+	@$(DOCKERPY) $(PIP) install -r requirements.txt
+
+CODESPELL = $(PYTOOLS)/codespell
+$(CODESPELL): PACKAGE=codespell
+
 # Generate
 
 .PHONY: generate
@@ -180,6 +213,10 @@ vanity-import-fix: | $(PORTO)
 misspell: | $(MISSPELL)
 	@$(MISSPELL) -w $(ALL_DOCS)
 
+.PHONY: codespell
+codespell: | $(CODESPELL)
+	@$(DOCKERPY) $(CODESPELL)
+
 .PHONY: license-check
 license-check:
 	@licRes=$$(for f in $$(find . -type f \( -iname '*.go' -o -iname '*.sh' \) ! -path '**/third_party/*' ! -path './.git/*' ) ; do \

requirements.txt

@@ -0,0 +1 @@
+codespell==2.2.4