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// 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"
"github.com/google/go-containerregistry/internal/windows"
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"
"github.com/google/go-containerregistry/pkg/v1/types"
)
func isWindows(img v1.Image) (bool, error) {
cfg, err := img.ConfigFile()
if err != nil {
return false, err
}
return cfg != nil && cfg.OS == "windows", nil
}
// Append reads a layer from path and appends it the the v1.Image base.
//
// If the base image is a Windows base image (i.e., its config.OS is
// "windows"), the contents of the tarballs will be modified to be suitable for
// a Windows container image.`,
func Append(base v1.Image, paths ...string) (v1.Image, error) {
if base == nil {
return nil, fmt.Errorf("invalid argument: base")
}
win, err := isWindows(base)
if err != nil {
return nil, fmt.Errorf("getting base image: %w", err)
}
baseMediaType, err := base.MediaType()
if err != nil {
return nil, fmt.Errorf("getting base image media type: %w", err)
}
layerType := types.DockerLayer
if baseMediaType == types.OCIManifestSchema1 {
layerType = types.OCILayer
}
layers := make([]v1.Layer, 0, len(paths))
for _, path := range paths {
layer, err := getLayer(path, layerType)
if err != nil {
return nil, fmt.Errorf("reading layer %q: %w", path, err)
}
if win {
layer, err = windows.Windows(layer)
if err != nil {
return nil, fmt.Errorf("converting %q for Windows: %w", path, err)
}
}
layers = append(layers, layer)
}
return mutate.AppendLayers(base, layers...)
}
func getLayer(path string, layerType types.MediaType) (v1.Layer, error) {
f, err := streamFile(path)
if err != nil {
return nil, err
}
if f != nil {
return stream.NewLayer(f, stream.WithMediaType(layerType)), nil
}
return tarball.LayerFromFile(path, tarball.WithMediaType(layerType))
}
// 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
}
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