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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
package main
import (
"bufio"
"errors"
"flag"
"fmt"
"io"
"io/fs"
"os"
"os/exec"
"path/filepath"
"strings"
)
const codeDir = "/nezuko/code/"
func checkRepoName(name string) (string, error) {
if strings.Contains(name, "/") {
return "", fmt.Errorf("invalid name %q: contains slashes", name)
}
if !strings.HasSuffix(name, ".git") {
name += ".git"
}
return name, nil
}
func createRepo(name string) error {
dir := filepath.Join(codeDir, name)
fmt.Fprintf(os.Stderr, "mkdir %s\n", dir)
if err := os.Mkdir(dir, 0755); err != nil {
return err
}
fmt.Fprintf(os.Stderr, "cd %s && git init --bare\n", dir)
git := exec.Command("git", "init", "--bare")
git.Dir = dir
git.Stdout = os.Stdout
git.Stderr = os.Stderr
if err := git.Run(); err != nil {
return err
}
return nil
}
func create() error {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, `Usage: create [REPO]...
Create a new git repo named REPO.
`)
}
flag.Parse()
args := flag.Args()
if len(args) == 0 {
return fmt.Errorf("missing operand\nUse create -help for usage info")
}
names := make([]string, len(args))
var errs []error
for i, arg := range args {
var err error
names[i], err = checkRepoName(arg)
if err != nil {
errs = append(errs, err)
}
}
if len(errs) > 0 {
return errors.Join(errs...)
}
failed := false
for _, name := range names {
if err := createRepo(name); err != nil {
fmt.Fprintln(os.Stderr, err)
failed = true
}
}
if failed {
return fmt.Errorf("failed to create repo")
}
return nil
}
func fileExists(path string) bool {
_, err := os.Stat(path)
return !errors.Is(err, fs.ErrNotExist)
}
func delete() error {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, `Usage: delete [REPO]
Delete the git repo named REPO.
`)
}
flag.Parse()
args := flag.Args()
if len(args) == 0 {
return fmt.Errorf("missing operand\nUse delete -help for usage info")
}
if len(args) > 1 {
return fmt.Errorf("too many positional arguments\nUse delete -help for usage info")
}
name, err := checkRepoName(args[0])
if err != nil {
return err
}
dir := filepath.Join(codeDir, name)
shortName := strings.TrimSuffix(name, ".git")
fmt.Fprintf(os.Stderr, "This will irreversibly delete repo %q.\nType %q to confirm: ", name, shortName)
scanner := bufio.NewScanner(os.Stdin)
if !scanner.Scan() || scanner.Text() != shortName {
return fmt.Errorf("name does not match")
}
fmt.Fprintf(os.Stderr, "rm -rf %s\n", dir)
if !fileExists(dir) {
return fmt.Errorf("repo %q does not exist", name)
}
if err := os.RemoveAll(dir); err != nil {
return err
}
return nil
}
func installFile(srcPath, dstPath string) error {
fmt.Fprintf(os.Stderr, "cp %s %s && chmod +x %[2]s\n", srcPath, dstPath)
src, err := os.Open(srcPath)
if err != nil {
return err
}
defer src.Close()
dst, err := os.OpenFile(dstPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
if err != nil {
return err
}
defer dst.Close()
if _, err := io.Copy(dst, src); err != nil {
return err
}
if err := dst.Close(); err != nil {
return err
}
return nil
}
func install() error {
const dir = "/nezuko/code/git-shell-commands"
fmt.Fprintf(os.Stderr, "Install to %q? ", dir)
scanner := bufio.NewScanner(os.Stdin)
if !scanner.Scan() {
return fmt.Errorf("exiting")
}
response := strings.TrimSpace(scanner.Text())
if !(response == "" || strings.EqualFold(response, "y") || strings.EqualFold(response, "yes")) {
return fmt.Errorf("exiting")
}
selfPath := os.Args[0]
if !strings.Contains(selfPath, "/") {
var err error
if selfPath, err = exec.LookPath(selfPath); err != nil {
return err
}
}
helpPath := filepath.Join(dir, "help")
if err := installFile(selfPath, helpPath); err != nil {
return err
}
for _, cmd := range []string{"create", "delete"} {
cmdPath := filepath.Join(dir, cmd)
fmt.Fprintf(os.Stderr, "ln -f %s %s\n", helpPath, cmdPath)
if err := os.Remove(cmdPath); err != nil && !errors.Is(err, os.ErrNotExist) {
return err
}
if err := os.Link(helpPath, cmdPath); err != nil {
return err
}
}
return nil
}
func help() {
fmt.Printf(`Available commands:
create create a new git repo
delete delete a git repo
help print this message
`)
}
func main() {
var err error
switch filepath.Base(os.Args[0]) {
case "create":
err = create()
case "delete":
err = delete()
case "git-shell-commands":
err = install()
default:
help()
}
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
|
