-
Notifications
You must be signed in to change notification settings - Fork 542
/
append.go
72 lines (61 loc) · 1.84 KB
/
append.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
// Copyright 2018 Google LLC 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 crane
import (
"fmt"
"os"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"github.com/google/go-containerregistry/pkg/v1/stream"
"github.com/google/go-containerregistry/pkg/v1/tarball"
)
// Append reads a layer from path and appends it the the v1.Image base.
func Append(base v1.Image, paths ...string) (v1.Image, error) {
layers := make([]v1.Layer, 0, len(paths))
for _, path := range paths {
layer, err := getLayer(path)
if err != nil {
return nil, fmt.Errorf("reading layer %q: %v", path, err)
}
layers = append(layers, layer)
}
return mutate.AppendLayers(base, layers...)
}
func getLayer(path string) (v1.Layer, error) {
f, err := streamFile(path)
if err != nil {
return nil, err
}
if f != nil {
return stream.NewLayer(f), nil
}
return tarball.LayerFromFile(path)
}
// If we're dealing with a named pipe, trying to open it multiple times will
// fail, so we need to do a streaming upload.
//
// returns nil, nil for non-streaming files
func streamFile(path string) (*os.File, error) {
if path == "-" {
return os.Stdin, nil
}
fi, err := os.Stat(path)
if err != nil {
return nil, err
}
if !fi.Mode().IsRegular() {
return os.Open(path)
}
return nil, nil
}