Bazel Training

Prerequisite

bazel --version
bazel 6.0.0

bazel concept and terminology
1. Workspace: a directory on your filesystem that contains the source files for the software you want to build. Each workspace directory has a text file named WORKSPACE.
2. Repository: The directory containing the WORKSPACE file is the root of the main repository, also called @.
3. Package: The primary unit of code organization in a repository. A package is defined as a directory containing a file named BUILD or BUILD.bazel.
4. Target: A package is a container. The elements of a package are called targets.
5. Labels:
  - @myrepo//my/app/main:app_binary = //my/app/main:app_binary inside @myrepo
  - my/app/main: un-qualified package name
  - @myrepo//my/app/main: full-qualified package name
  - app_binary or :app_binary inside @myrepo//my/app/main
Repository rules (WORKSPACE):
1. Git git_repository
2. Http http_archive
3. util maybe

Bazel
1. bazel clean: clean up the cache.
Java:
1. build: bazel build //java:App
2. run: bazel run //java:App
3. check dep: bazel query --notool_deps --noimplicit_deps "deps(//java:App)" --output graph
Python: bazel run //python:main
Go:
1. build: bazel build //go/cmd: Build a package cmd.
2. run: bazel run //go/cmd: Run a package cmd.
3. bazel run //:gazelle: Generate build file.
4. bazel run //:gazelle -- update-repos -from_file=go.mod: Update go_repository in WORKSPACE from go.mod.