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gitea/build/generate-go-licenses.go

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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
//go:build ignore
package main
import (
"encoding/json"
"fmt"
"io/fs"
"os"
"path"
"path/filepath"
"regexp"
"sort"
"strings"
"code.gitea.io/gitea/modules/container"
)
// regexp is based on go-license, excluding README and NOTICE
// https://github.com/google/go-licenses/blob/master/licenses/find.go
var licenseRe = regexp.MustCompile(`^(?i)((UN)?LICEN(S|C)E|COPYING).*$`)
type LicenseEntry struct {
Name string `json:"name"`
Path string `json:"path"`
LicenseText string `json:"licenseText"`
}
func main() {
if len(os.Args) != 3 {
fmt.Println("usage: go run generate-go-licenses.go <base-dir> <out-json-file>")
os.Exit(1)
}
base, out := os.Args[1], os.Args[2]
// Add ext for excluded files because license_test.go will be included for some reason.
// And there are more files that should be excluded, check with:
//
// go run github.com/google/go-licenses@v1.6.0 save . --force --save_path=.go-licenses 2>/dev/null
// find .go-licenses -type f | while read FILE; do echo "${$(basename $FILE)##*.}"; done | sort -u
// AUTHORS
// COPYING
// LICENSE
// Makefile
// NOTICE
// gitignore
// go
// md
// mod
// sum
// toml
// txt
// yml
//
// It could be removed once we have a better regex.
excludedExt := container.SetOf(".gitignore", ".go", ".mod", ".sum", ".toml", ".yml")
var paths []string
err := filepath.WalkDir(base, func(path string, entry fs.DirEntry, err error) error {
if err != nil {
return err
}
if entry.IsDir() || !licenseRe.MatchString(entry.Name()) || excludedExt.Contains(filepath.Ext(entry.Name())) {
return nil
}
paths = append(paths, path)
return nil
})
if err != nil {
panic(err)
}
sort.Strings(paths)
var entries []LicenseEntry
for _, filePath := range paths {
licenseText, err := os.ReadFile(filePath)
if err != nil {
panic(err)
}
pkgPath := filepath.ToSlash(filePath)
pkgPath = strings.TrimPrefix(pkgPath, base+"/")
pkgName := path.Dir(pkgPath)
// There might be a bug somewhere in go-licenses that sometimes interprets the
// root package as "." and sometimes as "code.gitea.io/gitea". Workaround by
// removing both of them for the sake of stable output.
if pkgName == "." || pkgName == "code.gitea.io/gitea" {
continue
}
entries = append(entries, LicenseEntry{
Name: pkgName,
Path: pkgPath,
LicenseText: string(licenseText),
})
}
jsonBytes, err := json.MarshalIndent(entries, "", " ")
if err != nil {
panic(err)
}
// Ensure file has a final newline
if jsonBytes[len(jsonBytes)-1] != '\n' {
jsonBytes = append(jsonBytes, '\n')
}
err = os.WriteFile(out, jsonBytes, 0o644)
if err != nil {
panic(err)
}
}