feature/docker-action (#11)

Co-authored-by: kjuulh <contact@kjuulh.io>
Reviewed-on: https://git.front.kjuulh.io/kjuulh/kraken/pulls/11

internal/actions/action.go

@@ -30,6 +30,18 @@ func (a *Action) Execute(ctx context.Context, area *storage.Area) error {
 
 			zap.L().Debug("Execution done")
 
+		case "docker-build":
+			zap.L().Debug("Building docker-build")
+			runCmd, err := builders.NewDockerBuild(zap.L()).Build(ctx, a.SchemaPath, action.Entry)
+			if err != nil {
+				return err
+			}
+			err = runCmd(ctx, area.Path)
+			if err != nil {
+				return err
+			}
+			return nil
+
 		default:
 			return errors.New("could not determine action type")
 		}

internal/actions/builders/docker.go

@@ -0,0 +1,95 @@
+package builders
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapio"
+)
+
+type DockerBuild struct {
+	logger *zap.Logger
+}
+
+func NewDockerBuild(logger *zap.Logger) *DockerBuild {
+	return &DockerBuild{logger: logger}
+}
+
+type DockerRunCommand func(ctx context.Context, victimPath string) error
+
+func (g *DockerBuild) Build(ctx context.Context, modulePath, entryPath string) (DockerRunCommand, error) {
+	g.logger.Debug("Building docker image", zap.String("actiondir", modulePath), zap.String("entry", entryPath))
+
+	if _, err := os.Stat(fmt.Sprintf("%s/%s", modulePath, entryPath)); os.IsNotExist(err) {
+		return nil, errors.New("could not find entry")
+	}
+
+	b := make([]byte, 20)
+	_, err := rand.Reader.Read(b)
+	if err != nil {
+		return nil, err
+	}
+	tag := hex.EncodeToString(b)
+	buildDockerCmd := fmt.Sprintf("(cd %s; docker build -f %s --tag kraken/%s .)", modulePath, entryPath, tag)
+	g.logger.Debug("Running command", zap.String("command", buildDockerCmd))
+
+	cmd := exec.CommandContext(
+		ctx,
+		"/bin/bash",
+		"-c",
+		buildDockerCmd,
+	)
+
+	debugwriter := &zapio.Writer{
+		Log:   g.logger,
+		Level: zap.DebugLevel,
+	}
+	defer debugwriter.Close()
+
+	cmd.Stdout = debugwriter
+	cmd.Stderr = debugwriter
+	err = cmd.Start()
+	if err != nil {
+		return nil, err
+	}
+
+	err = cmd.Wait()
+	if err != nil {
+		return nil, err
+	}
+
+	g.logger.Debug("Docker image built!")
+
+	return func(ctx context.Context, victimPath string) error {
+		g.logger.Debug("Executing script", zap.String("victim", victimPath))
+
+		cmd := exec.CommandContext(
+			ctx,
+			"/bin/bash",
+			"-c",
+			fmt.Sprintf("docker run --rm -v %s/:/src/work/ kraken/%s", victimPath, tag),
+		)
+
+		runDockerWriter := &zapio.Writer{
+			Log:   g.logger,
+			Level: zap.DebugLevel,
+		}
+		defer runDockerWriter.Close()
+
+		cmd.Stdout = runDockerWriter
+		cmd.Stderr = runDockerWriter
+
+		err = cmd.Start()
+		if err != nil {
+			return err
+		}
+
+		return cmd.Wait()
+	}, nil
+}