Fix Docker API compatibility with network alias (#17167)

* Add BaseHostsFile to container configuration
* Do not copy /etc/hosts file from host when creating a container using Docker API

Signed-off-by: Gavin Lam <gavin.oss@tutamail.com>

test/compose/etc_hosts/README.md

@@ -0,0 +1,10 @@
+etc hosts
+===========
+
+This test mounts a /etc/hosts file in the host containing an entry `foobar`, then create a container with an alias of the same hostname.
+
+Validation
+------------
+
+* No /etc/hosts entries are copied from the host. There should be only one entry of the hostname, which is IP address of the alias.
+* The hostname is resolved to IP address of the alias.

test/compose/etc_hosts/docker-compose.yml

@@ -0,0 +1,19 @@
+version: '3.3'
+
+services:
+  test:
+    image: alpine
+    command: ["top"]
+    hostname: foobar
+    networks:
+      net1:
+        aliases:
+          - foobar
+
+networks:
+  net1:
+    driver: bridge
+    ipam:
+      driver: default
+      config:
+        - subnet: 10.123.0.0/24

test/compose/etc_hosts/hosts

@@ -0,0 +1,2 @@
+127.0.0.1 localhost
+127.0.0.1 foobar

test/compose/etc_hosts/setup.sh

@@ -0,0 +1,5 @@
+if ! is_rootless; then
+    mount --bind $TEST_ROOTDIR/etc_hosts/hosts /etc/hosts
+else
+    $PODMAN_BIN unshare mount --bind $TEST_ROOTDIR/etc_hosts/hosts /etc/hosts
+fi

test/compose/etc_hosts/teardown.sh

@@ -0,0 +1,5 @@
+if ! is_rootless; then
+    umount /etc/hosts
+else
+    $PODMAN_BIN unshare umount /etc/hosts
+fi

test/compose/etc_hosts/tests.sh

@@ -0,0 +1,12 @@
+# -*- bash -*-
+
+ctr_name="etc_hosts_test_1"
+if [ "$TEST_FLAVOR" = "compose_v2" ]; then
+    ctr_name="etc_hosts-test-1"
+fi
+
+podman exec "$ctr_name" sh -c 'grep "foobar" /etc/hosts'
+like "$output" "10\.123\.0\." "$testname : no entries are copied from the host"
+
+podman exec "$ctr_name" sh -c 'getent hosts foobar | awk "{print \$1}"'
+like "$output" "10\.123\.0\." "$testname : hostname is resolved to IP address of the alias"

test/compose/test-compose

@@ -207,7 +207,7 @@ function start_service() {
 
     $PODMAN_BIN \
         --log-level debug \
-	--storage-driver=vfs \
+        --storage-driver=vfs \
         --root $WORKDIR/root \
         --runroot $WORKDIR/runroot \
         --cgroup-manager=systemd \