all: disable tests that fail on Alpine

These changes are enough to pass all.bash using the
disabled linux-amd64-alpine builder via debugnewvm.

For #19938.
For #39857.

Change-Id: I7d160612259c77764b70d429ad94f0864689cdce
Reviewed-on: https://go-review.googlesource.com/c/go/+/419995
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>

misc/cgo/test/issue1435.go

@@ -10,6 +10,7 @@ package cgotest
 import (
 	"fmt"
 	"os"
+	"runtime"
 	"sort"
 	"strings"
 	"syscall"
@@ -145,6 +146,11 @@ func test1435(t *testing.T) {
 	if syscall.Getuid() != 0 {
 		t.Skip("skipping root only test")
 	}
+	if runtime.GOOS == "linux" {
+		if _, err := os.Stat("/etc/alpine-release"); err == nil {
+			t.Skip("skipping failing test on alpine - go.dev/issue/19938")
+		}
+	}
 
 	// Launch some threads in C.
 	const cts = 5

misc/cgo/test/pkg_test.go

@@ -34,6 +34,10 @@ func TestCrossPackageTests(t *testing.T) {
 		case "arm64":
 			t.Skip("Can't exec cmd/go subprocess on iOS.")
 		}
+	case "linux":
+		if _, err := os.Stat("/etc/alpine-release"); err == nil {
+			t.Skip("skipping failing test on alpine - go.dev/issue/39857")
+		}
 	}
 
 	GOPATH, err := os.MkdirTemp("", "cgotest")

misc/cgo/testcarchive/carchive_test.go

@@ -46,6 +46,13 @@ func TestMain(m *testing.M) {
 		fmt.Printf("SKIP - short mode and $GO_BUILDER_NAME not set\n")
 		os.Exit(0)
 	}
+	if runtime.GOOS == "linux" {
+		if _, err := os.Stat("/etc/alpine-release"); err == nil {
+			fmt.Printf("SKIP - skipping failing test on alpine - go.dev/issue/19938\n")
+			os.Exit(0)
+		}
+	}
+
 	log.SetFlags(log.Lshortfile)
 	os.Exit(testMain(m))
 }

misc/cgo/testcshared/cshared_test.go

@@ -44,6 +44,12 @@ func testMain(m *testing.M) int {
 		fmt.Printf("SKIP - short mode and $GO_BUILDER_NAME not set\n")
 		os.Exit(0)
 	}
+	if runtime.GOOS == "linux" {
+		if _, err := os.Stat("/etc/alpine-release"); err == nil {
+			fmt.Printf("SKIP - skipping failing test on alpine - go.dev/issue/19938\n")
+			os.Exit(0)
+		}
+	}
 
 	GOOS = goEnv("GOOS")
 	GOARCH = goEnv("GOARCH")

src/syscall/syscall_linux_test.go

@@ -516,6 +516,9 @@ func TestSetuidEtc(t *testing.T) {
 	if syscall.Getuid() != 0 {
 		t.Skip("skipping root only test")
 	}
+	if _, err := os.Stat("/etc/alpine-release"); err == nil {
+		t.Skip("skipping glibc test on alpine - go.dev/issue/19938")
+	}
 	vs := []struct {
 		call           string
 		fn             func() error