-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
144 lines (132 loc) · 2.82 KB
/
main.go
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
package main
import (
"fmt"
"io"
"io/ioutil"
"log"
"os"
"go-cp/utils"
)
func main() {
args := os.Args
if len(args) != 3 {
fmt.Println("Usage: go-cp SOURCE DEST")
os.Exit(1)
}
src := os.Args[1]
dst := os.Args[2]
srcStat, err := os.Stat(src)
if err != nil {
log.Fatal(err)
}
dstStat, err := os.Stat(dst)
if err == nil {
if dstStat.IsDir() {
// TODO Validate if recursive copying is the
// intended behavior, for e.g. via '-r' option.
if srcStat.IsDir() {
err := CopyDir(src, dst)
if err != nil {
log.Fatal(err)
}
} else {
err := CopyFile(src, dst + src)
if err != nil {
log.Fatal(err)
}
}
} else if !srcStat.IsDir() {
err := CopyFile(src, dst)
if err != nil {
log.Fatal(err)
}
} else if !srcStat.Mode().IsRegular() {
// Cannot copy non-regular files apart from
// directories (e.g. symlinks, devices etc.)
log.Fatalf("Ignoring non-regular source file %s (%q)",
dstStat.Name(), dstStat.Mode().String())
} else {
log.Fatalf("Omitting directory '%s'", dst)
}
} else if os.IsNotExist(err) {
if srcStat.IsDir() {
err := os.Mkdir(dst, os.ModePerm)
if err != nil {
log.Fatal(err)
}
err = CopyDir(src, dst)
if err != nil {
log.Fatal(err)
}
} else {
err := CopyFile(src, dst)
if err != nil {
log.Fatal(err)
}
}
} else {
log.Fatal(err)
}
}
// CopyDir recursively copies all the files from the
// directory named 'src' to the directory named 'dst'.
func CopyDir(src, dst string) error {
src = util.CheckTrailingSlash(src)
dst = util.CheckTrailingSlash(dst)
files, err := ioutil.ReadDir(src)
if err != nil {
return err
}
var f1, f2 string
for _, f := range files {
f1 = src + f.Name()
f2 = dst + f.Name()
srcStat, err := os.Stat(f1)
if err != nil {
return err
}
if srcStat.IsDir() {
_, err := os.Stat(f2)
if os.IsNotExist(err) {
err := os.Mkdir(f2, os.ModePerm)
if err != nil {
log.Fatal(err)
}
} else if err != nil {
log.Fatal(err)
}
err = CopyDir(f1, f2)
} else if srcStat.Mode().IsRegular() {
err = CopyFile(f1, f2)
} else {
log.Fatalf("Ignoring non-regular source file %s (%q)",
srcStat.Name(), srcStat.Mode().String())
}
}
return nil
}
// CopyFile copies the contents of file named 'src' to the file named 'dst'.
// The destination file will be created if it does not exist. If it already
// exists, then its contents will be replaced by the contents of source file.
func CopyFile(src, dst string) error {
from, err := os.Open(src)
if err != nil {
log.Fatal(err)
}
defer from.Close()
to, err := os.Create(dst)
if err != nil {
return err
}
defer to.Close()
_, err = io.Copy(to, from)
if err != nil {
return err
}
// Flush to disk.
err = to.Sync()
if err != nil {
return err
}
return to.Close() // TODO from.close() ?
}