-
Notifications
You must be signed in to change notification settings - Fork 235
/
get.go
155 lines (136 loc) · 4.35 KB
/
get.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
// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
// getter is a package for downloading files or directories from a variety of
// protocols.
//
// getter is unique in its ability to download both directories and files.
// It also detects certain source strings to be protocol-specific URLs. For
// example, "github.com/hashicorp/go-getter" would turn into a Git URL and
// use the Git protocol.
//
// Protocols and detectors are extensible.
//
// To get started, see Client.
package getter
import (
"bytes"
"fmt"
"net/url"
"os/exec"
"regexp"
"syscall"
cleanhttp "github.com/hashicorp/go-cleanhttp"
)
// Getter defines the interface that schemes must implement to download
// things.
type Getter interface {
// Get downloads the given URL into the given directory. This always
// assumes that we're updating and gets the latest version that it can.
//
// The directory may already exist (if we're updating). If it is in a
// format that isn't understood, an error should be returned. Get shouldn't
// simply nuke the directory.
Get(string, *url.URL) error
// GetFile downloads the give URL into the given path. The URL must
// reference a single file. If possible, the Getter should check if
// the remote end contains the same file and no-op this operation.
GetFile(string, *url.URL) error
// ClientMode returns the mode based on the given URL. This is used to
// allow clients to let the getters decide which mode to use.
ClientMode(*url.URL) (ClientMode, error)
// SetClient allows a getter to know it's client
// in order to access client's Get functions or
// progress tracking.
SetClient(*Client)
}
// Getters is the mapping of scheme to the Getter implementation that will
// be used to get a dependency.
var Getters map[string]Getter
// forcedRegexp is the regular expression that finds forced getters. This
// syntax is schema::url, example: git::https://foo.com
var forcedRegexp = regexp.MustCompile(`^([A-Za-z0-9]+)::(.+)$`)
// httpClient is the default client to be used by HttpGetters.
var httpClient = cleanhttp.DefaultClient()
func init() {
httpGetter := &HttpGetter{
Netrc: true,
}
Getters = map[string]Getter{
"file": new(FileGetter),
"git": new(GitGetter),
"gcs": new(GCSGetter),
"hg": new(HgGetter),
"s3": new(S3Getter),
"http": httpGetter,
"https": httpGetter,
}
}
// Get downloads the directory specified by src into the folder specified by
// dst. If dst already exists, Get will attempt to update it.
//
// src is a URL, whereas dst is always just a file path to a folder. This
// folder doesn't need to exist. It will be created if it doesn't exist.
func Get(dst, src string, opts ...ClientOption) error {
return (&Client{
Src: src,
Dst: dst,
Dir: true,
Options: opts,
}).Get()
}
// GetAny downloads a URL into the given destination. Unlike Get or
// GetFile, both directories and files are supported.
//
// dst must be a directory. If src is a file, it will be downloaded
// into dst with the basename of the URL. If src is a directory or
// archive, it will be unpacked directly into dst.
func GetAny(dst, src string, opts ...ClientOption) error {
return (&Client{
Src: src,
Dst: dst,
Mode: ClientModeAny,
Options: opts,
}).Get()
}
// GetFile downloads the file specified by src into the path specified by
// dst.
func GetFile(dst, src string, opts ...ClientOption) error {
return (&Client{
Src: src,
Dst: dst,
Dir: false,
Options: opts,
}).Get()
}
// getRunCommand is a helper that will run a command and capture the output
// in the case an error happens.
func getRunCommand(cmd *exec.Cmd) error {
var buf bytes.Buffer
cmd.Stdout = &buf
cmd.Stderr = &buf
err := cmd.Run()
if err == nil {
return nil
}
if exiterr, ok := err.(*exec.ExitError); ok {
// The program has exited with an exit code != 0
if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
return fmt.Errorf(
"%s exited with %d: %s",
cmd.Path,
status.ExitStatus(),
buf.String())
}
}
return fmt.Errorf("error running %s: %s", cmd.Path, buf.String())
}
// getForcedGetter takes a source and returns the tuple of the forced
// getter and the raw URL (without the force syntax).
func getForcedGetter(src string) (string, string) {
var forced string
if ms := forcedRegexp.FindStringSubmatch(src); ms != nil {
forced = ms[1]
src = ms[2]
}
return forced, src
}