Install kernels in mounted volume instead of dockerfile layers

container.go

@@ -0,0 +1,93 @@
+// Copyright 2023 Mikhail Klementev. All rights reserved.
+// Use of this source code is governed by a AGPLv3 license
+// (or later) that can be found in the LICENSE file.
+
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"os/user"
+	"time"
+
+	"github.com/rs/zerolog/log"
+)
+
+type container struct {
+	name    string
+	timeout time.Duration
+	Volumes struct {
+		LibModules string
+		UsrSrc     string
+		Boot       string
+	}
+}
+
+func NewContainer(name string, timeout time.Duration) (c container, err error) {
+	c.name = name
+	c.timeout = timeout
+
+	usr, err := user.Current()
+	if err != nil {
+		return
+	}
+
+	c.Volumes.LibModules = fmt.Sprintf(
+		"%s/.out-of-tree/volumes/%s/lib/modules", usr.HomeDir, name)
+	os.MkdirAll(c.Volumes.LibModules, 0777)
+
+	c.Volumes.UsrSrc = fmt.Sprintf(
+		"%s/.out-of-tree/volumes/%s/usr/src", usr.HomeDir, name)
+	os.MkdirAll(c.Volumes.UsrSrc, 0777)
+
+	c.Volumes.Boot = fmt.Sprintf(
+		"%s/.out-of-tree/volumes/%s/boot", usr.HomeDir, name)
+	os.MkdirAll(c.Volumes.Boot, 0777)
+
+	return
+}
+
+func (c container) Build(imagePath string) (output string, err error) {
+	args := []string{"build"}
+	args = append(args, "-t", c.name, imagePath)
+
+	cmd := exec.Command("docker", args...)
+	log.Debug().Msgf("%v", cmd)
+
+	rawOutput, err := cmd.CombinedOutput()
+	output = string(rawOutput)
+	return
+}
+
+func (c container) Run(workdir string, command string) (output string, err error) {
+	cmd := exec.Command("docker", "run", "--rm",
+		"-v", workdir+":/work",
+		"-v", c.Volumes.LibModules+":/lib/modules",
+		"-v", c.Volumes.UsrSrc+":/usr/src",
+		"-v", c.Volumes.Boot+":/boot",
+		c.name, "bash", "-c", "cd /work && "+command)
+
+	log.Debug().Msgf("%v", cmd)
+
+	timer := time.AfterFunc(c.timeout, func() {
+		log.Info().Str("container", c.name).
+			Str("workdir", workdir).
+			Str("command", command).
+			Msg("killing container by timeout")
+		cmd.Process.Kill()
+	})
+	defer timer.Stop()
+
+	raw, err := cmd.CombinedOutput()
+	if err != nil {
+		e := fmt.Sprintf("error `%v` for cmd `%v` with output `%v`",
+			err, command, string(raw))
+		err = errors.New(e)
+		return
+	}
+
+	output = string(raw)
+	return
+}