mirror of https://github.com/linka-cloud/d2vm.git
131 lines
3.4 KiB
Go
131 lines
3.4 KiB
Go
// Copyright 2022 Linka Cloud All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package d2vm
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/google/uuid"
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"github.com/sirupsen/logrus"
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"github.com/svenwiltink/sparsecat"
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"go.linka.cloud/d2vm/pkg/docker"
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)
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func Convert(ctx context.Context, img string, opts ...ConvertOption) error {
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o := &convertOptions{}
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for _, opt := range opts {
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opt(o)
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}
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imgUUID := uuid.New().String()
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tmpPath := filepath.Join(os.TempDir(), "d2vm", imgUUID)
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if err := os.MkdirAll(tmpPath, os.ModePerm); err != nil {
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return err
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}
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defer os.RemoveAll(tmpPath)
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logrus.Infof("inspecting image %s", img)
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r, err := FetchDockerImageOSRelease(ctx, img, tmpPath)
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if err != nil {
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return err
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}
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if o.luksPassword != "" && !r.SupportsLUKS() {
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return fmt.Errorf("luks is not supported for %s %s", r.Name, r.Version)
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}
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if !o.raw {
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d, err := NewDockerfile(r, img, o.password, o.networkManager, o.luksPassword != "")
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if err != nil {
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return err
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}
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logrus.Infof("docker image based on %s %s", d.Release.Name, d.Release.Version)
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p := filepath.Join(tmpPath, docker.FormatImgName(img))
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dir := filepath.Dir(p)
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f, err := os.Create(p)
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if err != nil {
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return err
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}
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defer f.Close()
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if err := d.Render(f); err != nil {
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return err
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}
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logrus.Infof("building kernel enabled image")
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if err := docker.Build(ctx, imgUUID, p, dir); err != nil {
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return err
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}
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if !o.keepCache {
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defer docker.Remove(ctx, imgUUID)
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}
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} else {
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// for raw images, we just tag the image with the uuid
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if err := docker.Tag(ctx, img, imgUUID); err != nil {
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return err
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}
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if !o.keepCache {
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defer docker.Remove(ctx, imgUUID)
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}
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}
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logrus.Infof("creating vm image")
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format := strings.TrimPrefix(filepath.Ext(o.output), ".")
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if format == "" {
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format = "raw"
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}
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b, err := NewBuilder(ctx, tmpPath, imgUUID, "", o.size, r, format, o.cmdLineExtra, o.splitBoot, o.bootSize, o.luksPassword)
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if err != nil {
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return err
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}
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defer b.Close()
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if err := b.Build(ctx); err != nil {
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return err
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}
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if err := os.RemoveAll(o.output); err != nil {
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return err
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}
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if err := MoveFile(filepath.Join(tmpPath, "disk0."+format), o.output); err != nil {
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return err
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}
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return nil
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}
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func MoveFile(sourcePath, destPath string) error {
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inputFile, err := os.Open(sourcePath)
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if err != nil {
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return fmt.Errorf("failed to open source file: %s", err)
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}
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outputFile, err := os.Create(destPath)
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if err != nil {
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inputFile.Close()
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return fmt.Errorf("failed to open dest file: %s", err)
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}
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defer outputFile.Close()
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_, err = sparsecat.NewDecoder(sparsecat.NewEncoder(inputFile)).WriteTo(outputFile)
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inputFile.Close()
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if err != nil {
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return fmt.Errorf("failed to write to output file: %s", err)
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}
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// The copy was successful, so now delete the original file
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err = os.Remove(sourcePath)
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if err != nil {
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return fmt.Errorf("failed to remove original file: %s", err)
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}
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return nil
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}
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