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
|
//go:build windows
// +build windows
package main
import (
"errors"
"io/fs"
"os"
"path/filepath"
"strings"
"syscall"
"unsafe"
"golang.org/x/sys/windows/registry"
)
type operation int
const (
HWND_BROADCAST = 0xFFFF
WM_SETTINGCHANGE = 0x001A
SMTO_ABORTIFHUNG = 0x0002
ERR_BAD_ARGS = 0x000A
OPERATION_FAILED = 0x06AC
Environment = "Environment"
Add operation = iota
Remove
NotSpecified
)
func main() {
op := NotSpecified
if len(os.Args) >= 2 {
switch os.Args[1] {
case "add":
op = Add
case "remove":
op = Remove
}
}
// Stay silent since ran from an installer
if op == NotSpecified {
alert("Usage: " + filepath.Base(os.Args[0]) + " [add|remove]\n\nThis utility adds or removes the podman directory to the Windows Path.")
os.Exit(ERR_BAD_ARGS)
}
if err := modify(op); err != nil {
os.Exit(OPERATION_FAILED)
}
}
func modify(op operation) error {
exe, err := os.Executable()
if err != nil {
return err
}
exe, err = filepath.EvalSymlinks(exe)
if err != nil {
return err
}
target := filepath.Dir(exe)
if op == Remove {
return removePathFromRegistry(target)
}
return addPathToRegistry(target)
}
// Appends a directory to the Windows Path stored in the registry
func addPathToRegistry(dir string) error {
k, _, err := registry.CreateKey(registry.CURRENT_USER, Environment, registry.WRITE|registry.READ)
if err != nil {
return err
}
defer k.Close()
existing, typ, err := k.GetStringValue("Path")
if err != nil {
return err
}
// Is this directory already on the windows path?
for _, element := range strings.Split(existing, ";") {
if strings.EqualFold(element, dir) {
// Path already added
return nil
}
}
// If the existing path is empty we don't want to start with a delimiter
if len(existing) > 0 {
existing += ";"
}
existing += dir
// It's important to preserve the registry key type so that it will be interpreted correctly
// EXPAND = evaluate variables in the expression, e.g. %PATH% should be expanded to the system path
// STRING = treat the contents as a string literal
if typ == registry.EXPAND_SZ {
err = k.SetExpandStringValue("Path", existing)
} else {
err = k.SetStringValue("Path", existing)
}
if err == nil {
broadcastEnvironmentChange()
}
return err
}
// Removes all occurences of a directory path from the Windows path stored in the registry
func removePathFromRegistry(path string) error {
k, err := registry.OpenKey(registry.CURRENT_USER, Environment, registry.READ|registry.WRITE)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
// Nothing to cleanup, the Environment registry key does not exist.
return nil
}
return err
}
defer k.Close()
existing, typ, err := k.GetStringValue("Path")
if err != nil {
return err
}
var elements []string
for _, element := range strings.Split(existing, ";") {
if strings.EqualFold(element, path) {
continue
}
elements = append(elements, element)
}
newPath := strings.Join(elements, ";")
// Preserve value type (see corresponding comment above)
if typ == registry.EXPAND_SZ {
err = k.SetExpandStringValue("Path", newPath)
} else {
err = k.SetStringValue("Path", newPath)
}
if err == nil {
broadcastEnvironmentChange()
}
return err
}
// Sends a notification message to all top level windows informing them the environmental setings have changed.
// Applications such as the Windows command prompt and powershell will know to stop caching stale values on
// subsequent restarts. Since applications block the sender when receiving a message, we set a 3 second timeout
func broadcastEnvironmentChange() {
env, _ := syscall.UTF16PtrFromString(Environment)
user32 := syscall.NewLazyDLL("user32")
proc := user32.NewProc("SendMessageTimeoutW")
millis := 3000
_, _, _ = proc.Call(HWND_BROADCAST, WM_SETTINGCHANGE, 0, uintptr(unsafe.Pointer(env)), SMTO_ABORTIFHUNG, uintptr(millis), 0)
}
// Creates an "error" style pop-up window
func alert(caption string) int {
// Error box style
format := 0x10
user32 := syscall.NewLazyDLL("user32.dll")
captionPtr, _ := syscall.UTF16PtrFromString(caption)
titlePtr, _ := syscall.UTF16PtrFromString("winpath")
ret, _, _ := user32.NewProc("MessageBoxW").Call(
uintptr(0),
uintptr(unsafe.Pointer(captionPtr)),
uintptr(unsafe.Pointer(titlePtr)),
uintptr(format))
return int(ret)
}
|
