summaryrefslogtreecommitdiffstats
path: root/build/generate-go-licenses.go
blob: 22ef817ebc413624704e9b43b53de7dba2dab714 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
// 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

	{
		licenseText, err := os.ReadFile("LICENSE")
		if err != nil {
			panic(err)
		}

		entries = append(entries, LicenseEntry{
			Name:        "codeberg.org/forgejo/forgejo",
			Path:        "codeberg.org/forgejo/forgejo/GPL-3.0-or-later",
			LicenseText: string(licenseText),
		})
	}

	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)
	}
}