-
Notifications
You must be signed in to change notification settings - Fork 1
/
proc_cmdline.go
121 lines (97 loc) · 2.63 KB
/
proc_cmdline.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
// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package proccmdline
import (
"errors"
"fmt"
"io/ioutil"
"strings"
"github.com/rancher/os/config/cloudinit/datasource"
"github.com/rancher/os/config/cloudinit/pkg"
"github.com/rancher/os/pkg/log"
)
const (
ProcCmdlineLocation = "/proc/cmdline"
ProcCmdlineCloudConfigFlag = "cloud-config-url"
)
type ProcCmdline struct {
Location string
lastError error
}
func NewDatasource() *ProcCmdline {
return &ProcCmdline{Location: ProcCmdlineLocation}
}
func (c *ProcCmdline) IsAvailable() bool {
var contents []byte
contents, c.lastError = ioutil.ReadFile(c.Location)
if c.lastError != nil {
return false
}
cmdline := strings.TrimSpace(string(contents))
_, c.lastError = findCloudConfigURL(cmdline)
return (c.lastError == nil)
}
func (c *ProcCmdline) Finish() error {
return nil
}
func (c *ProcCmdline) String() string {
return fmt.Sprintf("%s: %s (lastError: %v)", c.Type(), c.Location, c.lastError)
}
func (c *ProcCmdline) AvailabilityChanges() bool {
return false
}
func (c *ProcCmdline) ConfigRoot() string {
return ""
}
func (c *ProcCmdline) FetchMetadata() (datasource.Metadata, error) {
return datasource.Metadata{}, nil
}
func (c *ProcCmdline) FetchUserdata() ([]byte, error) {
contents, err := ioutil.ReadFile(c.Location)
if err != nil {
return nil, err
}
cmdline := strings.TrimSpace(string(contents))
url, err := findCloudConfigURL(cmdline)
if err != nil {
return nil, err
}
client := pkg.NewHTTPClient()
cfg, err := client.GetRetry(url)
if err != nil {
return nil, err
}
return cfg, nil
}
func (c *ProcCmdline) Type() string {
return "proc-cmdline"
}
func findCloudConfigURL(input string) (url string, err error) {
err = errors.New("cloud-config-url not found")
for _, token := range strings.Split(input, " ") {
parts := strings.SplitN(token, "=", 2)
key := parts[0]
key = strings.Replace(key, "_", "-", -1)
if key != "cloud-config-url" {
continue
}
if len(parts) != 2 {
log.Printf("Found cloud-config-url in /proc/cmdline with no value, ignoring.")
continue
}
url = parts[1]
err = nil
}
return
}