Allow a different runtime on dangerzone-image commands.

This can be done with the newly added `--runtime` flag, which needs to
be passed to the first group, e.g:

```bash
dangerzone-cli --runtime docker COMMAND
```

dangerzone/container_utils.py

@@ -240,7 +240,6 @@ def container_pull(image: str, manifest_digest: str, callback: Callable):
         stderr=subprocess.STDOUT,
         text=True,
         bufsize=1,
-        universal_newlines=True,
     )
 
     for line in process.stdout:  # type: ignore

dangerzone/updater/cli.py

@@ -1,9 +1,12 @@
 #!/usr/bin/python
 
+import functools
 import logging
 
 import click
 
+from .. import container_utils
+from ..container_utils import get_runtime_name
 from . import attestations, errors, log, registry, signatures
 
 DEFAULT_REPOSITORY = "freedomofpress/dangerzone"
@@ -13,7 +16,8 @@ DEFAULT_IMAGE_NAME = "ghcr.io/freedomofpress/dangerzone/dangerzone"
 
 @click.group()
 @click.option("--debug", is_flag=True)
-def main(debug: bool) -> None:
+@click.option("--runtime", default=get_runtime_name())
+def main(debug: bool, runtime: str) -> None:
     if debug:
         click.echo("Debug mode enabled")
         level = logging.DEBUG
@@ -21,6 +25,10 @@ def main(debug: bool) -> None:
         level = logging.INFO
     logging.basicConfig(level=level)
 
+    if runtime != get_runtime_name():
+        click.echo(f"Using container runtime: {runtime}")
+        container_utils.RUNTIME_NAME = runtime
+
 
 @main.command()
 @click.argument("image", default=DEFAULT_IMAGE_NAME)
@@ -28,8 +36,10 @@ def main(debug: bool) -> None:
 def upgrade(image: str, pubkey: str) -> None:
     """Upgrade the image to the latest signed version."""
     manifest_digest = registry.get_manifest_digest(image)
+
     try:
-        signatures.upgrade_container_image(image, manifest_digest, pubkey)
+        callback = functools.partial(click.echo, nl=False)
+        signatures.upgrade_container_image(image, manifest_digest, pubkey, callback)
         click.echo(f"✅ The local image {image} has been upgraded")
         click.echo(f"✅ The image has been signed with {pubkey}")
         click.echo(f"✅ Signatures has been verified and stored locally")
@@ -56,17 +66,23 @@ def store_signatures(image: str, pubkey: str) -> None:
 @main.command()
 @click.argument("image_filename")
 @click.option("--pubkey", default=signatures.DEFAULT_PUBKEY_LOCATION)
-def load_archive(image_filename: str, pubkey: str) -> None:
+@click.option("--force", is_flag=True)
+def load_archive(image_filename: str, pubkey: str, force: bool) -> None:
     """Upgrade the local image to the one in the archive."""
     try:
         loaded_image = signatures.upgrade_container_image_airgapped(
-            image_filename, pubkey
+            image_filename, pubkey, bypass_logindex=force
         )
         click.echo(
             f"✅ Installed image {image_filename} on the system as {loaded_image}"
         )
     except errors.ImageAlreadyUpToDate as e:
         click.echo(f"✅ {e}")
+    except errors.InvalidLogIndex as e:
+        click.echo(f"❌ Trying to install image older that the currently installed one")
+        raise click.Abort()
+    except Exception as e:
+        click.echo(f"❌ {e}")
         raise click.Abort()
 
 

dangerzone/updater/signatures.py

@@ -216,7 +216,9 @@ def _get_blob(tmpdir: str, digest: str) -> Path:
     return Path(tmpdir) / "blobs" / "sha256" / digest.replace("sha256:", "")
 
 
-def upgrade_container_image_airgapped(container_tar: str, pubkey: str) -> str:
+def upgrade_container_image_airgapped(
+    container_tar: str, pubkey: str, bypass_logindex: bool = False
+) -> str:
     """
     Verify the given archive against its self-contained signatures, then
     upgrade the image and retag it to the expected tag.
@@ -262,14 +264,15 @@ def upgrade_container_image_airgapped(container_tar: str, pubkey: str) -> str:
             image_name, signatures = convert_oci_images_signatures(json.load(f), tmpdir)
         log.info(f"Found image name: {image_name}")
 
-        # Ensure that we only upgrade if the log index is higher than the last known one
-        incoming_log_index = get_log_index_from_signatures(signatures)
-        last_log_index = get_last_log_index()
+        if not bypass_logindex:
+            # Ensure that we only upgrade if the log index is higher than the last known one
+            incoming_log_index = get_log_index_from_signatures(signatures)
+            last_log_index = get_last_log_index()
 
-        if incoming_log_index < last_log_index:
-            raise errors.InvalidLogIndex(
-                "The log index is not higher than the last known one"
-            )
+            if incoming_log_index < last_log_index:
+                raise errors.InvalidLogIndex(
+                    "The log index is not higher than the last known one"
+                )
 
         image_digest = index_json["manifests"][0].get("digest").replace("sha256:", "")