Introduce a subprocess_run utility function

This is done to avoid forgetting windows specific arguments when calling `subprocess.run`.

dangerzone/container_utils.py

@@ -14,6 +14,11 @@ CONTAINER_NAME = "ghcr.io/freedomofpress/dangerzone/dangerzone"
 log = logging.getLogger(__name__)
 
 
+def subprocess_run(*args, **kwargs) -> subprocess.CompletedProcess:
+    """subprocess.run with the correct startupinfo for Windows."""
+    return subprocess.run(*args, startupinfo=get_subprocess_startupinfo(), **kwargs)
+
+
 def get_runtime_name() -> str:
     if platform.system() == "Linux":
         return "podman"
@@ -39,9 +44,8 @@ def get_runtime_version() -> Tuple[int, int]:
 
     cmd = [runtime, "version", "-f", query]
     try:
-        version = subprocess.run(
+        version = subprocess_run(
             cmd,
-            startupinfo=get_subprocess_startupinfo(),
             capture_output=True,
             check=True,
         ).stdout.decode()
@@ -144,8 +148,7 @@ def load_image_tarball_from_gzip() -> None:
 
 def load_image_tarball_from_tar(tarball_path: str) -> None:
     cmd = [get_runtime(), "load", "-i", tarball_path]
-    subprocess.run(cmd, startupinfo=get_subprocess_startupinfo(), check=True)
-
+    subprocess_run(cmd, check=True)
     log.info("Successfully installed container image from %s", tarball_path)
 
 
@@ -156,7 +159,7 @@ def tag_image_by_digest(digest: str, tag: str) -> None:
     image_id = get_image_id_by_digest(digest)
     cmd = [get_runtime(), "tag", image_id, tag]
     log.debug(" ".join(cmd))
-    subprocess.run(cmd, startupinfo=get_subprocess_startupinfo(), check=True)
+    subprocess_run(cmd, check=True)
 
 
 def get_image_id_by_digest(digest: str) -> str:
@@ -172,9 +175,7 @@ def get_image_id_by_digest(digest: str) -> str:
         "{{.Id}}",
     ]
     log.debug(" ".join(cmd))
-    process = subprocess.run(
-        cmd, startupinfo=get_subprocess_startupinfo(), check=True, capture_output=True
-    )
+    process = subprocess_run(cmd, check=True, capture_output=True)
     # In case we have multiple lines, we only want the first one.
     return process.stdout.decode().strip().split("\n")[0]
 
@@ -183,7 +184,7 @@ def container_pull(image: str, manifest_digest: str):
     """Pull a container image from a registry."""
     cmd = [get_runtime_name(), "pull", f"{image}@sha256:{manifest_digest}"]
     try:
-        subprocess.run(cmd, startupinfo=get_subprocess_startupinfo(), check=True)
+        subprocess_run(cmd, check=True)
     except subprocess.CalledProcessError as e:
         raise errors.ContainerPullException(
             f"Could not pull the container image: {e}"
@@ -199,7 +200,11 @@ def get_local_image_digest(image: str) -> str:
     cmd = [get_runtime_name(), "images", image, "--format", "{{.Digest}}"]
     log.debug(" ".join(cmd))
     try:
-        result = subprocess.run(cmd, capture_output=True, check=True)
+        result = subprocess_run(
+            cmd,
+            capture_output=True,
+            check=True,
+        )
         lines = result.stdout.decode().strip().split("\n")
         if len(lines) != 1:
             raise errors.MultipleImagesFoundException(