forked from GoogleCloudPlatform/gcsfuse
/
main.go
134 lines (110 loc) · 3.24 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
// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 main
import (
"flag"
"fmt"
"log"
"os"
"os/signal"
"golang.org/x/net/context"
"golang.org/x/oauth2/google"
"github.com/jacobsa/fuse"
"github.com/jacobsa/gcloud/gcs"
)
////////////////////////////////////////////////////////////////////////
// Helpers
////////////////////////////////////////////////////////////////////////
func registerSIGINTHandler(mountPoint string) {
// Register for SIGINT.
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, os.Interrupt)
// Start a goroutine that will unmount when the signal is received.
go func() {
for {
<-signalChan
log.Println("Received SIGINT, attempting to unmount...")
err := fuse.Unmount(mountPoint)
if err != nil {
log.Printf("Failed to unmount in response to SIGINT: %v", err)
} else {
log.Printf("Successfully unmounted in response to SIGINT.")
return
}
}
}()
}
func getConn() (c gcs.Conn, err error) {
// Create the oauth2 token source.
const scope = gcs.Scope_FullControl
tokenSrc, err := google.DefaultTokenSource(context.Background(), scope)
if err != nil {
return nil, err
}
// Create the connection.
const userAgent = "gcsfuse/0.0"
cfg := &gcs.ConnConfig{
TokenSource: tokenSrc,
UserAgent: userAgent,
}
return gcs.NewConn(cfg)
}
////////////////////////////////////////////////////////////////////////
// main function
////////////////////////////////////////////////////////////////////////
func main() {
// Make logging output better.
log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds)
// Set up a custom usage function.
flag.CommandLine.Usage = func() {
fmt.Fprintf(
os.Stderr,
"Usage: %s [flags] bucket_name mount_point\n",
os.Args[0])
fmt.Fprintf(os.Stderr, "\n")
fmt.Fprintf(os.Stderr, "Flags:\n")
flag.PrintDefaults()
}
// Don't die on flag parsing errors; we watch for them below.
flag.CommandLine.Init("", flag.ContinueOnError)
// Grab the connection.
conn, err := getConn()
if err != nil {
log.Fatalf("getConn: %v", err)
}
// Mount the file system.
mfs, err := mount(
context.Background(),
os.Args[1:],
flag.CommandLine,
conn)
if err != nil {
// Special case: if the user requested help, the flag package has already
// called Usage for us. Exit cleanly.
if err == flag.ErrHelp {
return
}
log.Fatalf("mount: %v", err)
}
log.Println("File system has been successfully mounted.")
// Let the user unmount with Ctrl-C (SIGINT).
registerSIGINTHandler(mfs.Dir())
// Wait for the file system to be unmounted.
err = mfs.Join(context.Background())
if err != nil {
err = fmt.Errorf("MountedFileSystem.Join: %v", err)
return
}
log.Println("Successfully exiting.")
}