-
Notifications
You must be signed in to change notification settings - Fork 0
/
utils.go
214 lines (195 loc) · 5.61 KB
/
utils.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
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
202
203
204
205
206
207
208
209
210
211
212
213
214
package utils
import (
"crypto/sha1"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"github.com/docker/distribution/registry/api/errcode"
"github.com/docker/docker/dockerversion"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/stringid"
)
// SelfPath figures out the absolute path of our own binary (if it's still around).
func SelfPath() string {
path, err := exec.LookPath(os.Args[0])
if err != nil {
if os.IsNotExist(err) {
return ""
}
if execErr, ok := err.(*exec.Error); ok && os.IsNotExist(execErr.Err) {
return ""
}
panic(err)
}
path, err = filepath.Abs(path)
if err != nil {
if os.IsNotExist(err) {
return ""
}
panic(err)
}
return path
}
func dockerInitSha1(target string) string {
f, err := os.Open(target)
if err != nil {
return ""
}
defer f.Close()
h := sha1.New()
_, err = io.Copy(h, f)
if err != nil {
return ""
}
return hex.EncodeToString(h.Sum(nil))
}
func isValidDockerInitPath(target string, selfPath string) bool { // target and selfPath should be absolute (InitPath and SelfPath already do this)
if target == "" {
return false
}
if dockerversion.IAmStatic == "true" {
if selfPath == "" {
return false
}
if target == selfPath {
return true
}
targetFileInfo, err := os.Lstat(target)
if err != nil {
return false
}
selfPathFileInfo, err := os.Lstat(selfPath)
if err != nil {
return false
}
return os.SameFile(targetFileInfo, selfPathFileInfo)
}
return dockerversion.InitSHA1 != "" && dockerInitSha1(target) == dockerversion.InitSHA1
}
// DockerInitPath figures out the path of our dockerinit (which may be SelfPath())
func DockerInitPath(localCopy string) string {
selfPath := SelfPath()
if isValidDockerInitPath(selfPath, selfPath) {
// if we're valid, don't bother checking anything else
return selfPath
}
var possibleInits = []string{
localCopy,
dockerversion.InitPath,
filepath.Join(filepath.Dir(selfPath), "dockerinit"),
// FHS 3.0 Draft: "/usr/libexec includes internal binaries that are not intended to be executed directly by users or shell scripts. Applications may use a single subdirectory under /usr/libexec."
// https://www.linuxbase.org/betaspecs/fhs/fhs.html#usrlibexec
"/usr/libexec/docker/dockerinit",
"/usr/local/libexec/docker/dockerinit",
// FHS 2.3: "/usr/lib includes object files, libraries, and internal binaries that are not intended to be executed directly by users or shell scripts."
// https://refspecs.linuxfoundation.org/FHS_2.3/fhs-2.3.html#USRLIBLIBRARIESFORPROGRAMMINGANDPA
"/usr/lib/docker/dockerinit",
"/usr/local/lib/docker/dockerinit",
}
for _, dockerInit := range possibleInits {
if dockerInit == "" {
continue
}
path, err := exec.LookPath(dockerInit)
if err == nil {
path, err = filepath.Abs(path)
if err != nil {
// LookPath already validated that this file exists and is executable (following symlinks), so how could Abs fail?
panic(err)
}
if isValidDockerInitPath(path, selfPath) {
return path
}
}
}
return ""
}
var globalTestID string
// TestDirectory creates a new temporary directory and returns its path.
// The contents of directory at path `templateDir` is copied into the
// new directory.
func TestDirectory(templateDir string) (dir string, err error) {
if globalTestID == "" {
globalTestID = stringid.GenerateNonCryptoID()[:4]
}
prefix := fmt.Sprintf("docker-test%s-%s-", globalTestID, GetCallerName(2))
if prefix == "" {
prefix = "docker-test-"
}
dir, err = ioutil.TempDir("", prefix)
if err = os.Remove(dir); err != nil {
return
}
if templateDir != "" {
if err = archive.CopyWithTar(templateDir, dir); err != nil {
return
}
}
return
}
// GetCallerName introspects the call stack and returns the name of the
// function `depth` levels down in the stack.
func GetCallerName(depth int) string {
// Use the caller function name as a prefix.
// This helps trace temp directories back to their test.
pc, _, _, _ := runtime.Caller(depth + 1)
callerLongName := runtime.FuncForPC(pc).Name()
parts := strings.Split(callerLongName, ".")
callerShortName := parts[len(parts)-1]
return callerShortName
}
// ReplaceOrAppendEnvValues returns the defaults with the overrides either
// replaced by env key or appended to the list
func ReplaceOrAppendEnvValues(defaults, overrides []string) []string {
cache := make(map[string]int, len(defaults))
for i, e := range defaults {
parts := strings.SplitN(e, "=", 2)
cache[parts[0]] = i
}
for _, value := range overrides {
// Values w/o = means they want this env to be removed/unset.
if !strings.Contains(value, "=") {
if i, exists := cache[value]; exists {
defaults[i] = "" // Used to indicate it should be removed
}
continue
}
// Just do a normal set/update
parts := strings.SplitN(value, "=", 2)
if i, exists := cache[parts[0]]; exists {
defaults[i] = value
} else {
defaults = append(defaults, value)
}
}
// Now remove all entries that we want to "unset"
for i := 0; i < len(defaults); i++ {
if defaults[i] == "" {
defaults = append(defaults[:i], defaults[i+1:]...)
i--
}
}
return defaults
}
// GetErrorMessage returns the human readable message associated with
// the passed-in error. In some cases the default Error() func returns
// something that is less than useful so based on its types this func
// will go and get a better piece of text.
func GetErrorMessage(err error) string {
switch err.(type) {
case errcode.Error:
e, _ := err.(errcode.Error)
return e.Message
case errcode.ErrorCode:
ec, _ := err.(errcode.ErrorCode)
return ec.Message()
default:
return err.Error()
}
}