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dockerfile.go
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dockerfile.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package initrd
import (
"context"
"fmt"
"io/fs"
"os"
"path/filepath"
"strings"
"golang.org/x/sync/errgroup"
"kraftkit.sh/config"
"kraftkit.sh/log"
"github.com/cavaliergopher/cpio"
"github.com/moby/buildkit/client"
"github.com/moby/buildkit/util/progress/progressui"
_ "github.com/moby/buildkit/client/connhelper/dockercontainer"
_ "github.com/moby/buildkit/client/connhelper/kubepod"
_ "github.com/moby/buildkit/client/connhelper/nerdctlcontainer"
_ "github.com/moby/buildkit/client/connhelper/podmancontainer"
_ "github.com/moby/buildkit/client/connhelper/ssh"
)
type dockerfile struct {
opts InitrdOptions
dockerfile string
files []string
workdir string
}
// NewFromDockerfile accepts an input path which represents a Dockerfile that
// can be constructed via buildkit to become a CPIO archive.
func NewFromDockerfile(ctx context.Context, path string, opts ...InitrdOption) (Initrd, error) {
if !strings.Contains(strings.ToLower(path), "dockerfile") {
return nil, fmt.Errorf("file is not a Dockerfile")
}
initrd := dockerfile{
opts: InitrdOptions{},
dockerfile: path,
workdir: filepath.Dir(path),
}
for _, opt := range opts {
if err := opt(&initrd.opts); err != nil {
return nil, err
}
}
return &initrd, nil
}
// Build implements Initrd.
func (initrd *dockerfile) Build(ctx context.Context) (string, error) {
if initrd.opts.output == "" {
fi, err := os.CreateTemp("", "")
if err != nil {
return "", err
}
initrd.opts.output = fi.Name()
}
outputDir, err := os.MkdirTemp("", "")
if err != nil {
return "", fmt.Errorf("could not make temporary directory: %w", err)
}
buildkitAddr := config.G[config.KraftKit](ctx).BuildKitHost
c, err := client.New(ctx,
buildkitAddr,
client.WithFailFast(),
)
if err != nil {
return "", fmt.Errorf("could not instantiate BuildKit client: %w", err)
}
buildKitInfo, err := c.Info(ctx)
if err != nil {
log.G(ctx).Warn("could not connect to BuildKit client, is BuildKit running?")
log.G(ctx).Warn("")
log.G(ctx).Warn("By default, KraftKit will look for a native install which")
log.G(ctx).Warn("is located at /run/buildkit/buildkit.sock. Alternatively, you")
log.G(ctx).Warn("can run BuildKit in a container (recommended for macOS users)")
log.G(ctx).Warn("which you can do by running:")
log.G(ctx).Warn("")
log.G(ctx).Warn(" docker run --rm -d --name buildkit --privileged moby/buildkit:latest")
log.G(ctx).Warn(" export KRAFTKIT_BUILDKIT_HOST=docker-container://buildkit")
log.G(ctx).Warn("")
log.G(ctx).Warn("For more usage instructions visit: https://unikraft.org/buildkit")
log.G(ctx).Warn("")
return "", fmt.Errorf("could not get BuildKit info: %w", err)
}
log.G(ctx).
WithField("version", buildKitInfo.BuildkitVersion).
Debug("using buildkit")
var cacheExports []client.CacheOptionsEntry
if len(initrd.opts.cacheDir) > 0 {
cacheExports = []client.CacheOptionsEntry{
{
Type: "local",
Attrs: map[string]string{
"dest": initrd.opts.cacheDir,
},
},
}
}
solveOpt := &client.SolveOpt{
Exports: []client.ExportEntry{
{
Type: client.ExporterLocal,
OutputDir: outputDir,
},
},
CacheExports: cacheExports,
LocalDirs: map[string]string{
"context": initrd.workdir,
"dockerfile": filepath.Dir(initrd.dockerfile),
},
Frontend: "dockerfile.v0",
FrontendAttrs: map[string]string{
"filename": filepath.Base(initrd.dockerfile),
},
}
if initrd.opts.arch != "" {
solveOpt.FrontendAttrs["platform"] = fmt.Sprintf("linux/%s", initrd.opts.arch)
}
ch := make(chan *client.SolveStatus)
eg, ctx := errgroup.WithContext(ctx)
eg.Go(func() error {
_, err := c.Solve(ctx, nil, *solveOpt, ch)
if err != nil {
return fmt.Errorf("could not solve: %w", err)
}
return nil
})
eg.Go(func() error {
_, err = progressui.DisplaySolveStatus(ctx, nil, log.G(ctx).Writer(), ch)
if err != nil {
return fmt.Errorf("could not display output progress: %w", err)
}
return nil
})
if err := eg.Wait(); err != nil {
return "", fmt.Errorf("could not wait for err group: %w", err)
}
f, err := os.OpenFile(initrd.opts.output, os.O_RDWR|os.O_CREATE, 0o644)
if err != nil {
return "", fmt.Errorf("could not open initramfs file: %w", err)
}
defer f.Close()
writer := cpio.NewWriter(f)
defer writer.Close()
// Recursively walk the output directory on successful build and serialize to
// the output
if err := filepath.WalkDir(outputDir, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return fmt.Errorf("received error before parsing path: %w", err)
}
internal := strings.TrimPrefix(path, filepath.Clean(outputDir))
if internal == "" {
return nil // Do not archive empty paths
}
internal = "." + filepath.ToSlash(internal)
info, err := d.Info()
if err != nil {
return fmt.Errorf("could not get directory entry info: %w", err)
}
if d.Type().IsDir() {
if err := writer.WriteHeader(&cpio.Header{
Name: internal,
Mode: cpio.FileMode(info.Mode().Perm()) | cpio.TypeDir,
}); err != nil {
return fmt.Errorf("could not write CPIO header: %w", err)
}
return nil
}
initrd.files = append(initrd.files, internal)
log.G(ctx).
WithField("file", internal).
Trace("archiving")
var data []byte
targetLink := ""
if info.Mode()&os.ModeSymlink != 0 {
targetLink, err = os.Readlink(path)
data = []byte(targetLink)
} else if d.Type().IsRegular() {
data, err = os.ReadFile(path)
} else {
log.G(ctx).Warnf("unsupported file: %s", path)
return nil
}
if err != nil {
return fmt.Errorf("could not read file: %w", err)
}
header := &cpio.Header{
Name: internal,
Mode: cpio.FileMode(info.Mode().Perm()),
ModTime: info.ModTime(),
Size: info.Size(),
}
switch {
case info.Mode().IsDir():
header.Mode |= cpio.TypeDir
case info.Mode().IsRegular():
header.Mode |= cpio.TypeReg
case info.Mode()&fs.ModeSymlink != 0:
header.Mode |= cpio.TypeSymlink
header.Linkname = targetLink
}
if err := writer.WriteHeader(header); err != nil {
return fmt.Errorf("writing cpio header for %q: %w", internal, err)
}
if _, err := writer.Write(data); err != nil {
return fmt.Errorf("could not write CPIO data for %s: %w", internal, err)
}
return nil
}); err != nil {
return "", fmt.Errorf("could not walk output path: %w", err)
}
return initrd.opts.output, nil
}
// Files implements Initrd.
func (initrd *dockerfile) Files() []string {
return initrd.files
}