Fix inspect template .HostIp for Docker compatibility

libpod/define/container_inspect.go

@@ -265,6 +265,12 @@ type InspectHostPort struct {
 	HostPort string `json:"HostPort"`
 }
 
+// HostIp allows Docker-compatible {{.HostIp}} access in Go templates.
+// See https://github.com/containers/podman/issues/29164
+func (hp InspectHostPort) HostIp() string {
+	return hp.HostIP
+}
+
 // InspectMount provides a record of a single mount in a container. It contains
 // fields for both named and normal volumes. Only user-specified volumes will be
 // included, and tmpfs volumes are not included even if the user specified them.

test/system/500-networking.bats

@@ -1068,6 +1068,27 @@ EOF
      fi
 }
 
+# Test for https://github.com/containers/podman/issues/29164
+@test "podman inspect .NetworkSettings.Ports docker-compatible HostIp field" {
+    local cname="c-$(safename)"
+    local port=$(random_free_port)
+
+    run_podman run -d --name $cname -p "127.0.0.1:$port:8080/tcp" $IMAGE top
+    cid="$output"
+
+    # Docker-compatible template: .HostIp (json key casing, not Go field .HostIP)
+    run_podman inspect --format '{{ with (index (index .NetworkSettings.Ports "8080/tcp") 0) }}{{ printf "%s\t%s" .HostIp .HostPort }}{{ end }}' $cname
+    assert "$output" = "127.0.0.1	$port" \
+        "inspect .HostIp should work (docker compat)"
+
+    # Podman-native template: .HostIP (Go field name) should still work
+    run_podman inspect --format '{{ with (index (index .NetworkSettings.Ports "8080/tcp") 0) }}{{ printf "%s\t%s" .HostIP .HostPort }}{{ end }}' $cname
+    assert "$output" = "127.0.0.1	$port" \
+        "inspect .HostIP should also work (podman native)"
+
+    run_podman rm -f -t0 $cname
+}
+
 # Test for https://github.com/containers/podman/issues/18615
 # CANNOT BE PARALLELIZED due to strict checking of /run/netns
 @test "podman network cleanup --userns + --restart" {