all: fix new lint warnings from bumping staticcheck

In prep for updating to new staticcheck required for Go 1.23.

Updates #12912

Change-Id: If77892a023b79c6fa798f936fc80428fd4ce0673
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

cmd/k8s-operator/svc.go

@@ -327,7 +327,7 @@ func (a *ServiceReconciler) maybeProvision(ctx context.Context, logger *zap.Suga
 	if err != nil {
 		msg := fmt.Sprintf("failed to parse cluster IP: %v", err)
 		tsoperator.SetServiceCondition(svc, tsapi.ProxyReady, metav1.ConditionFalse, reasonProxyFailed, msg, a.clock, logger)
-		return fmt.Errorf(msg)
+		return errors.New(msg)
 	}
 	for _, ip := range tsIPs {
 		addr, err := netip.ParseAddr(ip)

cmd/tailscale/cli/exitnode_test.go

@@ -135,7 +135,7 @@ func TestFilterFormatAndSortExitNodes(t *testing.T) {
 		result := filterFormatAndSortExitNodes(ps, "")
 
 		if res := cmp.Diff(result.Countries, want.Countries, cmpopts.IgnoreUnexported(key.NodePublic{})); res != "" {
-			t.Fatalf(res)
+			t.Fatal(res)
 		}
 	})
 
@@ -230,7 +230,7 @@ func TestFilterFormatAndSortExitNodes(t *testing.T) {
 		result := filterFormatAndSortExitNodes(ps, "Pacific")
 
 		if res := cmp.Diff(result.Countries, want.Countries, cmpopts.IgnoreUnexported(key.NodePublic{})); res != "" {
-			t.Fatalf(res)
+			t.Fatal(res)
 		}
 	})
 }

net/art/table_test.go

@@ -589,7 +589,7 @@ func TestInsertCompare(t *testing.T) {
 	}
 
 	if debugInsert {
-		t.Logf(fast.debugSummary())
+		t.Log(fast.debugSummary())
 	}
 
 	seenVals4 := map[int]bool{}

net/netmon/interfaces_linux.go

@@ -15,8 +15,6 @@ import (
 	"net"
 	"net/netip"
 	"os"
-	"os/exec"
-	"runtime"
 	"strings"
 	"sync/atomic"
 
@@ -50,9 +48,6 @@ ens18   0000000A        00000000        0001    0       0       0       0000FFFF
 func likelyHomeRouterIPLinux() (ret netip.Addr, myIP netip.Addr, ok bool) {
 	if procNetRouteErr.Load() {
 		// If we failed to read /proc/net/route previously, don't keep trying.
-		if runtime.GOOS == "android" {
-			return likelyHomeRouterIPAndroid()
-		}
 		return ret, myIP, false
 	}
 	lineNum := 0
@@ -94,9 +89,6 @@ func likelyHomeRouterIPLinux() (ret netip.Addr, myIP netip.Addr, ok bool) {
 	}
 	if err != nil {
 		procNetRouteErr.Store(true)
-		if runtime.GOOS == "android" {
-			return likelyHomeRouterIPAndroid()
-		}
 		log.Printf("interfaces: failed to read /proc/net/route: %v", err)
 	}
 	if ret.IsValid() {
@@ -137,41 +129,6 @@ func likelyHomeRouterIPLinux() (ret netip.Addr, myIP netip.Addr, ok bool) {
 	return netip.Addr{}, netip.Addr{}, false
 }
 
-// Android apps don't have permission to read /proc/net/route, at
-// least on Google devices and the Android emulator.
-func likelyHomeRouterIPAndroid() (ret netip.Addr, _ netip.Addr, ok bool) {
-	cmd := exec.Command("/system/bin/ip", "route", "show", "table", "0")
-	out, err := cmd.StdoutPipe()
-	if err != nil {
-		return
-	}
-	if err := cmd.Start(); err != nil {
-		log.Printf("interfaces: running /system/bin/ip: %v", err)
-		return
-	}
-	// Search for line like "default via 10.0.2.2 dev radio0 table 1016 proto static mtu 1500 "
-	lineread.Reader(out, func(line []byte) error {
-		const pfx = "default via "
-		if !mem.HasPrefix(mem.B(line), mem.S(pfx)) {
-			return nil
-		}
-		line = line[len(pfx):]
-		sp := bytes.IndexByte(line, ' ')
-		if sp == -1 {
-			return nil
-		}
-		ipb := line[:sp]
-		if ip, err := netip.ParseAddr(string(ipb)); err == nil && ip.Is4() {
-			ret = ip
-			log.Printf("interfaces: found Android default route %v", ip)
-		}
-		return nil
-	})
-	cmd.Process.Kill()
-	cmd.Wait()
-	return ret, netip.Addr{}, ret.IsValid()
-}
-
 func defaultRoute() (d DefaultRouteDetails, err error) {
 	v, err := defaultRouteInterfaceProcNet()
 	if err == nil {

safesocket/unixsocket.go

@@ -7,7 +7,6 @@ package safesocket
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"log"
 	"net"
@@ -18,9 +17,6 @@ import (
 )
 
 func connect(ctx context.Context, path string) (net.Conn, error) {
-	if runtime.GOOS == "js" {
-		return nil, errors.New("safesocket.Connect not yet implemented on js/wasm")
-	}
 	var std net.Dialer
 	return std.DialContext(ctx, "unix", path)
 }

ssh/tailssh/tailssh.go

@@ -1731,6 +1731,7 @@ func envValFromList(env []string, wantKey string) (v string) {
 // envEq reports whether environment variable a == b for the current
 // operating system.
 func envEq(a, b string) bool {
+	//lint:ignore SA4032 in case this func moves elsewhere, permit the GOOS check
 	if runtime.GOOS == "windows" {
 		return strings.EqualFold(a, b)
 	}

tstest/integration/vms/distros.go

@@ -11,8 +11,6 @@ import (
 	"github.com/tailscale/hujson"
 )
 
-// go:generate go run ./gen
-
 type Distro struct {
 	Name           string // amazon-linux
 	URL            string // URL to a qcow2 image