Add x-podman.no_hosts extension

Signed-off-by: Timon de Groot <timon.degroot@hypernode.com>

docs/Extensions.md

@@ -14,6 +14,8 @@ The following extension keys are available under container configuration:
 * `x-podman.rootfs` - Run the container without requiring any image management; the rootfs of the
 container is assumed to be managed externally.
 
+* `x-podman.no_hosts` - Run the container without creating /etc/hosts file
+
 For example, the following docker-compose.yml allows running a podman container with externally managed rootfs.
 ```yml
 version: "3"

newsfragments/container-no-hosts.feature

@@ -0,0 +1 @@
+Add x-podman.no_hosts setting to pass --no-hosts to podman run

podman_compose.py

@@ -1254,6 +1254,8 @@ async def container_to_args(compose, cnt, detached=True):
         podman_args.extend(["--uidmap", uidmap])
     for gidmap in cnt.get('x-podman.gidmaps', []):
         podman_args.extend(["--gidmap", gidmap])
+    if cnt.get("x-podman.no_hosts", False):
+        podman_args.extend(["--no-hosts"])
     rootfs = cnt.get('x-podman.rootfs', None)
     if rootfs is not None:
         rootfs_mode = True

tests/unit/test_container_to_args.py

@@ -249,6 +249,25 @@ class TestContainerToArgs(unittest.IsolatedAsyncioTestCase):
             ],
         )
 
+    async def test_no_hosts_extension(self):
+        c = create_compose_mock()
+
+        cnt = get_minimal_container()
+        cnt["x-podman.no_hosts"] = True
+
+        args = await container_to_args(c, cnt)
+        self.assertEqual(
+            args,
+            [
+                "--name=project_name_service_name1",
+                "-d",
+                "--network=bridge",
+                "--network-alias=service_name",
+                "--no-hosts",
+                "busybox",
+            ],
+        )
+
     async def test_env_file_str(self):
         c = create_compose_mock()