podman load: support downloading files

Support downloading files, for instance via
`podman load -i server.com/image.tar`.  The specified URL is downloaded
in the frontend and stored as a temp file that gets passed down to the
backend.

Also vendor in c/common@main to use the new `pkg/download`.

Fixes: #11970
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/cmd/podman/images/load.go b/cmd/podman/images/load.go
index c7b7d6b3f..c39ae624e 100644
--- a/cmd/podman/images/load.go
+++ b/cmd/podman/images/load.go
@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	"github.com/containers/common/pkg/completion"
+	"github.com/containers/common/pkg/download"
 	"github.com/containers/podman/v3/cmd/podman/registry"
 	"github.com/containers/podman/v3/cmd/podman/validate"
 	"github.com/containers/podman/v3/pkg/domain/entities"
@@ -69,6 +70,20 @@ func loadFlags(cmd *cobra.Command) {
 
 func load(cmd *cobra.Command, args []string) error {
 	if len(loadOpts.Input) > 0 {
+		// Download the input file if needed.
+		if strings.HasPrefix(loadOpts.Input, "https://") || strings.HasPrefix(loadOpts.Input, "http://") {
+			tmpdir, err := util.DefaultContainerConfig().ImageCopyTmpDir()
+			if err != nil {
+				return err
+			}
+			tmpfile, err := download.FromURL(tmpdir, loadOpts.Input)
+			if err != nil {
+				return err
+			}
+			defer os.Remove(tmpfile)
+			loadOpts.Input = tmpfile
+		}
+
 		if _, err := os.Stat(loadOpts.Input); err != nil {
 			return err
 		}