Enable no_hosts from containers.conf

cmd/podman/common/netflags.go

@@ -80,7 +80,7 @@ func DefineNetFlags(cmd *cobra.Command) {
 	_ = cmd.RegisterFlagCompletionFunc(publishFlagName, completion.AutocompleteNone)
 
 	netFlags.Bool(
-		"no-hosts", false,
+		"no-hosts", containerConfig.Containers.NoHosts,
 		"Do not create /etc/hosts within the container, instead use the version from the image",
 	)
 }

cmd/podman/containers/create.go

@@ -166,7 +166,11 @@ func createInit(c *cobra.Command) error {
 		return errors.Errorf("--cpu-quota and --cpus cannot be set together")
 	}
 
-	if c.Flag("no-hosts").Changed && c.Flag("add-host").Changed {
+	noHosts, err := c.Flags().GetBool("no-hosts")
+	if err != nil {
+		return err
+	}
+	if noHosts && c.Flag("add-host").Changed {
 		return errors.Errorf("--no-hosts and --add-host cannot be set together")
 	}
 	cliVals.UserNS = c.Flag("userns").Value.String()

test/e2e/config/containers.conf

@@ -55,6 +55,7 @@ umask = "0002"
 
 annotations=["run.oci.keep_original_groups=1",]
 
+no_hosts=true
 [engine]
 
 network_cmd_options=["allow_host_loopback=true"]

test/e2e/containers_conf_test.go

@@ -331,4 +331,26 @@ var _ = Describe("Podman run", func() {
 		Expect(inspect.OutputToString()).To(ContainSubstring("run.oci.keep_original_groups:1"))
 	})
 
+	It("podman run with --add-host and no-hosts=true fails", func() {
+		session := podmanTest.Podman([]string{"run", "-dt", "--add-host", "test1:127.0.0.1", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).To(ExitWithError())
+		Expect(session.ErrorToString()).To(ContainSubstring("--no-hosts and --add-host cannot be set together"))
+
+		session = podmanTest.Podman([]string{"run", "-dt", "--add-host", "test1:127.0.0.1", "--no-hosts=false", ALPINE, "top"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+	})
+
+	It("podman run with no-hosts=true /etc/hosts does not include hostname", func() {
+		session := podmanTest.Podman([]string{"run", "--rm", "--name", "test", ALPINE, "cat", "/etc/hosts"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+		Expect(session.OutputToString()).To(Not(ContainSubstring("test")))
+
+		session = podmanTest.Podman([]string{"run", "--rm", "--name", "test", "--no-hosts=false", ALPINE, "cat", "/etc/hosts"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+		Expect(session.OutputToString()).To(ContainSubstring("test"))
+	})
 })