fix(buildkitd): Start the daemon if it is not active

Add a method that will retrieve the version, the running state and the network host existence of the buildkitd container.
If the version is outdated or there is no host network, we delete the container and install a proper one.
If the container is correctly configured but is not active, we start it, which saves some time.

Signed-off-by: Lucas Perreau <lucas.perreau@ext.adeo.com>

util/buildkitd/buildkit_information.go

@@ -0,0 +1,62 @@
+package buildkitd
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"strconv"
+	"strings"
+
+	"github.com/docker/distribution/reference"
+)
+
+func getBuildkitInformation(ctx context.Context) (*BuilkitInformation, error) {
+	formatString := "{{.Config.Image}};{{.State.Running}};{{ if index .NetworkSettings.Networks \"host\" }}{{ \"true\" }}{{else}}{{\"false\"}}{{end}}"
+	cmd := exec.CommandContext(ctx,
+		"docker",
+		"inspect",
+		"--format",
+		formatString,
+		containerName,
+	)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return nil, err
+	}
+
+	s := strings.Split(string(output), ";")
+
+	// Retrieve the tag
+	ref, err := reference.ParseNormalizedNamed(strings.TrimSpace(s[0]))
+	if err != nil {
+		return nil, err
+	}
+	tag, ok := ref.(reference.Tagged)
+	if !ok {
+		return nil, fmt.Errorf("failed to parse image: %s", output)
+	}
+
+	// Retrieve the state
+	isActive, err := strconv.ParseBool(strings.TrimSpace(s[1]))
+	if err != nil {
+		return nil, err
+	}
+
+	// Retrieve the check on if the host network is configured
+	haveHostNetwork, err := strconv.ParseBool(strings.TrimSpace(s[2]))
+	if err != nil {
+		return nil, err
+	}
+
+	return &BuilkitInformation{
+		Version:         tag.Tag(),
+		IsActive:        isActive,
+		HaveHostNetwork: haveHostNetwork,
+	}, nil
+}
+
+type BuilkitInformation struct {
+	Version         string
+	IsActive        bool
+	HaveHostNetwork bool
+}