Switch to go mod

vendor/github.com/mudler/docker-companion/api/util.go

@@ -0,0 +1,80 @@
+package api
+
+import (
+	"bufio"
+	"context"
+	"io"
+	"os"
+
+	"github.com/urfave/cli"
+	archive "github.com/containerd/containerd/archive"
+	dockerarchive "github.com/docker/docker/pkg/archive"
+	docker "github.com/fsouza/go-dockerclient"
+	layer "github.com/openSUSE/umoci/oci/layer"
+	jww "github.com/spf13/jwalterweatherman"
+)
+
+type ExtractOpts struct {
+	Source, Destination                string
+	Compressed, KeepDirlinks, Rootless bool
+	UnpackMode                         string
+}
+
+func ExtractLayer(opts *ExtractOpts) error {
+	file, err := os.Open(opts.Source)
+	if err != nil {
+		return err
+	}
+	var r io.Reader
+	r = file
+
+	if opts.Compressed {
+		decompressedArchive, err := dockerarchive.DecompressStream(bufio.NewReader(file))
+		if err != nil {
+			return err
+		}
+		defer decompressedArchive.Close()
+		r = decompressedArchive
+	}
+
+	buf := bufio.NewReader(r)
+	switch opts.UnpackMode {
+	case "umoci": // more fixes are in there
+		return layer.UnpackLayer(opts.Destination, buf, &layer.MapOptions{KeepDirlinks: opts.KeepDirlinks, Rootless: opts.Rootless})
+	case "containerd": // more cross-compatible
+		_, err := archive.Apply(context.Background(), opts.Destination, buf)
+		return err
+	default: // moby way
+		return Untar(buf, opts.Destination, !opts.Compressed)
+	}
+}
+
+// PullImage pull the specified image
+func PullImage(client *docker.Client, image string) error {
+	var err error
+	// Pulling the image
+	jww.INFO.Printf("Pulling the docker image %s\n", image)
+	if err = client.PullImage(docker.PullImageOptions{Repository: image}, docker.AuthConfiguration{}); err != nil {
+		jww.ERROR.Printf("error pulling %s image: %s\n", image, err)
+		return err
+	}
+
+	jww.INFO.Println("Image", image, "pulled correctly")
+
+	return nil
+}
+
+// NewDocker Creates a new instance of *docker.Client, respecting env settings
+func NewDocker() (*docker.Client, error) {
+	var err error
+	var client *docker.Client
+	if os.Getenv("DOCKER_SOCKET") != "" {
+		client, err = docker.NewClient(os.Getenv("DOCKER_SOCKET"))
+	} else {
+		client, err = docker.NewClient("unix:///var/run/docker.sock")
+	}
+	if err != nil {
+		return nil, cli.NewExitError("could not connect to the Docker daemon", 87)
+	}
+	return client, nil
+}