先用Go写个hello-world源文件。执行go mod init和go mod tidy
[root@localhost hello]# cat main/main.go package mainimport "fmt"func main() {
fmt.Println("hello world")}[root@localhost hello]# lsmain[root@localhost hello]# go mod init hellogo: creating new go.mod: module hello
go: to add module requirements and sums:
go mod tidy[root@localhost hello]# lsgo.mod main[root@localhost hello]# go mod tidy编写bazel所需的WORKSPACE (WORKSPACE中加上rules_go)
代码语言：javascript复制[root@localhost hello]# cat WORKSPACE load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")http_archive(
name = "io_bazel_rules_go",
sha256 = "685052b498b6ddfe562ca7a97736741d87916fe536623afb7da2824c0211c369",
urls = [
"https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.33.0/rules_go-v0.33.0.zip", "https://github.com/bazelbuild/rules_go/releases/download/v0.33.0/rules_go-v0.33.0.zip", ],)load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")go_rules_dependencies()go_register_toolchains(version = "1.18.3")[root@localhost hello]# bazel build //main:mainERROR: Skipping '//main:main': no such package 'main': BUILD file not found in any of the following directories. Add a BUILD file to a directory to mark it as a package.
- /root/hello/main
WARNING: Target pattern parsing failed.
ERROR: no such package 'main': BUILD file not found in any of the following directories. Add a BUILD file to a directory to mark it as a package.
- /root/hello/main
INFO: Elapsed time: 0.137s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded)[root@localhost hello]# bazel run //main:mainERROR: Skipping '//main:main': no such package 'main': BUILD file not found in any of the following directories. Add a BUILD file to a directory to mark it as a package.
- /root/hello/main
WARNING: Target pattern parsing failed.
ERROR: no such package 'main': BUILD file not found in any of the following directories. Add a BUILD file to a directory to mark it as a package.
- /root/hello/main
INFO: Elapsed time: 0.127s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded)FAILED: Build did NOT complete successfully (0 packages loaded)这时执行bazel build和run，会报错，因为源码所在文件夹main文件夹里还没有BUILD.bazel文件和文件内容。该文件可以手动编写也可以用gazelle自动生成。下面分别介绍手动编写和自动生成BUILD.bazel文件。
代码语言：javascript复制[root@localhost hello]# vi main/BUILD.bazel[root@localhost hello]# cat main/BUILD.bazelload("@io_bazel_rules_go//go:def.bzl", "go_binary")go_binary(
name = "main",
srcs = ["main.go"],)[root@localhost hello]# bazel build //main:mainINFO: Analyzed target //main:main (1 packages loaded, 2 targets configured).
INFO: Found 1 target...
Target //main:main up-to-date:
bazel-bin/main/main_/main
INFO: Elapsed time: 0.318s, Critical Path: 0.13s
INFO: 3 processes: 1 internal, 2 linux-sandbox.
INFO: Build completed successfully, 3 total actions[root@localhost hello]# bazel run //main:mainINFO: Analyzed target //main:main (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //main:main up-to-date:
bazel-bin/main/main_/main
INFO: Elapsed time: 0.159s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action
INFO: Build completed successfully, 1 total action
hello world手动编辑源码所在文件夹main文件夹BUILD.bazel文件后，bazel build和run成功，下面介绍gazelle自动生成源码文件夹对应的BUILD.bazel文件。
先删除BUILD.bazel文件。
代码语言：javascript复制[root@localhost hello]# tree mainmain
├── BUILD.bazel
└── main.go0 directories, 2 files[root@localhost hello]# rm -rf main/BUILD.bazel [root@localhost hello]# tree mainmain
└── main.go0 directories, 1 fileWORKSPACE文件增加gazelle相关内容。
代码语言：javascript复制[root@localhost hello]# vi WORKSPACE [root@localhost hello]# cat WORKSPACE load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")http_archive(
name = "io_bazel_rules_go",
sha256 = "685052b498b6ddfe562ca7a97736741d87916fe536623afb7da2824c0211c369",
urls = [
"https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.33.0/rules_go-v0.33.0.zip", "https://github.com/bazelbuild/rules_go/releases/download/v0.33.0/rules_go-v0.33.0.zip", ],)http_archive(
name = "bazel_gazelle",
sha256 = "5982e5463f171da99e3bdaeff8c0f48283a7a5f396ec5282910b9e8a49c0dd7e",
urls = [
"https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.25.0/bazel-gazelle-v0.25.0.tar.gz", "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.25.0/bazel-gazelle-v0.25.0.tar.gz", ],)load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies")go_rules_dependencies()go_register_toolchains(version = "1.18.3")gazelle_dependencies()[root@localhost hello]# bazel run //:gazelleERROR: Skipping '//:gazelle': no such package '': BUILD file not found in any of the following directories. Add a BUILD file to a directory to mark it as a package.
- /root/hello
WARNING: Target pattern parsing failed.
ERROR: no such package '': BUILD file not found in any of the following directories. Add a BUILD file to a directory to mark it as a package.
- /root/hello
INFO: Elapsed time: 0.157s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded)FAILED: Build did NOT complete successfully (0 packages loaded)忘记项目根目录写BUILD.bazel文件的gazelle内容了。补上。
代码语言：javascript复制[root@localhost hello]# cat BUILD.bazel load("@bazel_gazelle//:def.bzl", "gazelle")# gazelle:prefix github.com/example/projectgazelle(name = "gazelle")[root@localhost hello]# bazel run //:gazelleINFO: Analyzed target //:gazelle (34 packages loaded, 407 targets configured).
INFO: Found 1 target...
ERROR: /root/.cache/bazel/_bazel_root/8516ecc87a690cd3acb37f3088b16cd1/external/org_golang_x_mod/module/BUILD.bazel:3:11: GoCompilePkg external/org_golang_x_mod/module/module.a [for host] failed: (Exit 1): builder failed: error executing command bazel-out/host/bin/external/go_sdk/builder compilepkg -sdk external/go_sdk -installsuffix linux_amd64 -src external/org_golang_x_mod/module/module.go -src external/org_golang_x_mod/module/pseudo.go ... (remaining 24 arguments skipped)Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
compilepkg: missing strict dependencies:
/root/.cache/bazel/_bazel_root/8516ecc87a690cd3acb37f3088b16cd1/sandbox/linux-sandbox/16/execroot/__main__/external/org_golang_x_mod/module/module.go: import of "golang.org/x/xerrors"No dependencies were provided.
Check that imports in Go sources match importpath attributes in deps.
Target //:gazelle failed to build
Use --verbose_failures to see the command lines of failed build steps.
INFO: Elapsed time: 47.864s, Critical Path: 1.31s
INFO: 25 processes: 15 internal, 10 linux-sandbox.
FAILED: Build did NOT complete successfully
FAILED: Build did NOT complete successfully执行gazelle报错：org_golang_x_mod/module/module.go: import of "golang.org/x/xerrors" No dependencies were provided.
这个错误可能是gazelle v0.24 和 v0.25 的bug，将版本降至v0.23错误消失。
代码语言：javascript复制#http_archive(# name = "bazel_gazelle",# sha256 = "5982e5463f171da99e3bdaeff8c0f48283a7a5f396ec5282910b9e8a49c0dd7e",# urls = [# "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.25.0/bazel-gazelle-v0.25.0.tar.gz",# "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.25.0/bazel-gazelle-v0.25.0.tar.gz",# ],#)http_archive(
name = "bazel_gazelle",
sha256 = "62ca106be173579c0a167deb23358fdfe71ffa1e4cfdddf5582af26520f1c66f",
urls = [
"https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.23.0/bazel-gazelle-v0.23.0.tar.gz", "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.23.0/bazel-gazelle-v0.23.0.tar.gz", ],)[root@localhost hello]# tree mainmain
└── main.go0 directories, 1 file[root@localhost hello]# bazel run //:gazelleINFO: Analyzed target //:gazelle (84 packages loaded, 8715 targets configured).
INFO: Found 1 target...
Target //:gazelle up-to-date:
bazel-bin/gazelle-runner.bash
bazel-bin/gazelle
INFO: Elapsed time: 59.258s, Critical Path: 25.89s
INFO: 26 processes: 4 internal, 22 linux-sandbox.
INFO: Build completed successfully, 26 total actions
INFO: Build completed successfully, 26 total actions[root@localhost hello]# tree mainmain
├── BUILD.bazel
└── main.go0 directories, 2 files[root@localhost hello]# cat main/BUILD.bazel load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")go_library(
name = "main_lib",
srcs = ["main.go"],
importpath = "github.com/example/project/main",
visibility = ["//visibility:private"],)go_binary(
name = "main",
embed = [":main_lib"],
visibility = ["//visibility:public"],)查看源文件对应的目录，自动生成了BUILD.bazel文件
bazel build 和 run 都正常
代码语言：javascript复制[root@localhost hello]# bazel build //main:mainINFO: Analyzed target //main:main (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //main:main up-to-date:
bazel-bin/main/main_/main
INFO: Elapsed time: 0.178s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action[root@localhost hello]# bazel run //main:mainINFO: Analyzed target //main:main (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //main:main up-to-date:
bazel-bin/main/main_/main
INFO: Elapsed time: 0.159s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action
INFO: Build completed successfully, 1 total action
hello world代码语言：javascript复制看了下gazalle代码仓库，17天前刚发了一个最新版本v0.26，试了下最新版BUG已经改掉，可将下面的内容替换掉WORKSPACE的相关内容
http_archive(
name = "bazel_gazelle",
sha256 = "501deb3d5695ab658e82f6f6f549ba681ea3ca2a5fb7911154b5aa45596183fa",
urls = [
"https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.26.0/bazel-gazelle-v0.26.0.tar.gz", "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.26.0/bazel-gazelle-v0.26.0.tar.gz", ],)load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")
