net: skip tests if creating a socket is disallowed

In a container environment, creating a socket may be disallowed. Try to
detect these cases and skip the tests instead of failing them.

Fixes #58114

Change-Id: I681d19107e946d2508e2d1704956360f13c7335b
Reviewed-on: https://go-review.googlesource.com/c/go/+/476217
Reviewed-by: Cherry Mui <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Run-TryBot: Tobias Klauser <[email protected]>
Auto-Submit: Tobias Klauser <[email protected]>
Reviewed-by: Bryan Mills <[email protected]>

Author: tklauser

src/net/iprawsock_test.go

@@ -7,6 +7,7 @@
 package net
 
 import (
+	"internal/testenv"
 	"reflect"
 	"testing"
 )
@@ -94,7 +95,11 @@ func TestIPConnLocalName(t *testing.T) {
 			continue
 		}
 		c, err := ListenIP(tt.net, tt.laddr)
-		if err != nil {
+		if testenv.SyscallIsNotSupported(err) {
+			// May be inside a container that disallows creating a socket.
+			t.Logf("skipping %s test: %v", tt.net, err)
+			continue
+		} else if err != nil {
 			t.Fatal(err)
 		}
 		defer c.Close()
@@ -105,13 +110,17 @@ func TestIPConnLocalName(t *testing.T) {
 }
 
 func TestIPConnRemoteName(t *testing.T) {
-	if !testableNetwork("ip:tcp") {
-		t.Skip("ip:tcp test")
+	network := "ip:tcp"
+	if !testableNetwork(network) {
+		t.Skipf("skipping %s test", network)
 	}
 
 	raddr := &IPAddr{IP: IPv4(127, 0, 0, 1).To4()}
-	c, err := DialIP("ip:tcp", &IPAddr{IP: IPv4(127, 0, 0, 1)}, raddr)
-	if err != nil {
+	c, err := DialIP(network, &IPAddr{IP: IPv4(127, 0, 0, 1)}, raddr)
+	if testenv.SyscallIsNotSupported(err) {
+		// May be inside a container that disallows creating a socket.
+		t.Skipf("skipping %s test: %v", network, err)
+	} else if err != nil {
 		t.Fatal(err)
 	}
 	defer c.Close()

src/net/protoconn_test.go

@@ -10,6 +10,7 @@
 package net
 
 import (
+	"internal/testenv"
 	"os"
 	"runtime"
 	"testing"
@@ -161,16 +162,15 @@ func TestUDPConnSpecificMethods(t *testing.T) {
 }
 
 func TestIPConnSpecificMethods(t *testing.T) {
-	if os.Getuid() != 0 {
-		t.Skip("must be root")
-	}
-
 	la, err := ResolveIPAddr("ip4", "127.0.0.1")
 	if err != nil {
 		t.Fatal(err)
 	}
 	c, err := ListenIP("ip4:icmp", la)
-	if err != nil {
+	if testenv.SyscallIsNotSupported(err) {
+		// May be inside a container that disallows creating a socket.
+		t.Skipf("skipping: %v", err)
+	} else if err != nil {
 		t.Fatal(err)
 	}
 	defer c.Close()