[forwardport] fix(netxlite): remove android-specific errno (#586) (#587)

This commit forward ports 74947dbbd12266c12a38fad51a70fc78a21720fd from
the `release/3.11` branch to `master`. Here's the original commit message:

- - -

Android is also Linux. The Android build fails because both
errno_linux.go and errno_android.go are compiled.

There's no difference between the files except into a comment
that mentions "linux" or "android".

Therefore, it's safe to remove the android-specific file
and just keep and use the linux-specific one.

Part of https://github.com/ooni/probe/issues/1863, where we're
forward porting ooni/go patches to go1.17.

I'm still trying to figure out whether I can build oonimkall
using the forward ported patches and this error prevents me
from building, because the build fails.

"やれやれだぜ"

Note that this patch WILL need to be forward ported to master.

This bug was previosuly reported to me by @hellais.

Because I did run `go generate ./internal/netxlite/...` we also
get for free updated certificates, which is OK.

internal/netxlite/certifi.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// 2021-10-20 14:12:54.599493 +0200 CEST m=+0.419755751
+// 2021-11-10 12:32:19.01980139 +0100 CET m=+0.363371740
 // https://curl.haxx.se/ca/cacert.pem
 
 package netxlite
@@ -10,7 +10,7 @@ const pemcerts string = `
 ##
 ## Bundle of CA Root Certificates
 ##
-## Certificate data from Mozilla as of: Thu Sep 30 03:12:05 2021 GMT
+## Certificate data from Mozilla as of: Tue Oct 26 03:12:05 2021 GMT
 ##
 ## This is a bundle of X.509 certificates of public Certificate Authorities
 ## (CA). These were automatically extracted from Mozilla's root certificates
@@ -23,7 +23,7 @@ const pemcerts string = `
 ## Just configure this file as the SSLCACertificateFile.
 ##
 ## Conversion done with mk-ca-bundle.pl version 1.28.
-## SHA256: c8f6733d1ff4e6a4769c182971a1234f95ae079247a9c439a13423fe8ba5c24f
+## SHA256: bb36818a81feaa4cca61101e6d6276cd09e972efcb08112dfed846918ca41d7f
 ##
 
 
@@ -3162,4 +3162,82 @@ OPQD8rv7gmsHINFSH5pkAnuYZttcTVoP0ISVoDwUQwbKytu4QTbaakRnh6+v40URFWkIsr4WOZck
 bxJF0WddCajJFdr60qZfE2Efv4WstK2tBZQIgx51F9NxO5NQI1mg7TyRVJ12AMXDuDjb
 -----END CERTIFICATE-----
 
+TunTrust Root CA
+================
+-----BEGIN CERTIFICATE-----
+MIIFszCCA5ugAwIBAgIUEwLV4kBMkkaGFmddtLu7sms+/BMwDQYJKoZIhvcNAQELBQAwYTELMAkG
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+AZ3r2OvEhJn7wAzMMujjd9qDRIueVSjAi1jTkD5OGwDxFa2DK5o=
+-----END CERTIFICATE-----
+
+HARICA TLS RSA Root CA 2021
+===========================
+-----BEGIN CERTIFICATE-----
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+kf3/W9b3raYvAwtt41dU63ZTGI0RmLo=
+-----END CERTIFICATE-----
+
+HARICA TLS ECC Root CA 2021
+===========================
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+
 `

internal/netxlite/errno.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.50877 +0200 CEST m=+0.664237210
+// Generated: 2021-11-10 12:32:24.588032308 +0100 CET m=+4.347991484
 
 package netxlite
 

internal/netxlite/errno_android.go

@@ -1,112 +0,0 @@
-// Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:54.844727 +0200 CEST m=+0.000188960
-
-package netxlite
-
-import (
-	"errors"
-	"syscall"
-
-	"golang.org/x/sys/unix"
-)
-
-// This enumeration provides a canonical name for
-// every system-call error we support. Note: this list
-// is system dependent. You're currently looking at
-// the list of errors for android.
-const (
-	ECONNREFUSED    = unix.ECONNREFUSED
-	ECONNRESET      = unix.ECONNRESET
-	EHOSTUNREACH    = unix.EHOSTUNREACH
-	ETIMEDOUT       = unix.ETIMEDOUT
-	EAFNOSUPPORT    = unix.EAFNOSUPPORT
-	EADDRINUSE      = unix.EADDRINUSE
-	EADDRNOTAVAIL   = unix.EADDRNOTAVAIL
-	EISCONN         = unix.EISCONN
-	EFAULT          = unix.EFAULT
-	EBADF           = unix.EBADF
-	ECONNABORTED    = unix.ECONNABORTED
-	EALREADY        = unix.EALREADY
-	EDESTADDRREQ    = unix.EDESTADDRREQ
-	EINTR           = unix.EINTR
-	EINVAL          = unix.EINVAL
-	EMSGSIZE        = unix.EMSGSIZE
-	ENETDOWN        = unix.ENETDOWN
-	ENETRESET       = unix.ENETRESET
-	ENETUNREACH     = unix.ENETUNREACH
-	ENOBUFS         = unix.ENOBUFS
-	ENOPROTOOPT     = unix.ENOPROTOOPT
-	ENOTSOCK        = unix.ENOTSOCK
-	ENOTCONN        = unix.ENOTCONN
-	EWOULDBLOCK     = unix.EWOULDBLOCK
-	EACCES          = unix.EACCES
-	EPROTONOSUPPORT = unix.EPROTONOSUPPORT
-	EPROTOTYPE      = unix.EPROTOTYPE
-)
-
-// classifySyscallError converts a syscall error to the
-// proper OONI error. Returns the OONI error string
-// on success, an empty string otherwise.
-func classifySyscallError(err error) string {
-	var errno syscall.Errno
-	if !errors.As(err, &errno) {
-		return ""
-	}
-	switch errno {
-	case unix.ECONNREFUSED:
-		return FailureConnectionRefused
-	case unix.ECONNRESET:
-		return FailureConnectionReset
-	case unix.EHOSTUNREACH:
-		return FailureHostUnreachable
-	case unix.ETIMEDOUT:
-		return FailureTimedOut
-	case unix.EAFNOSUPPORT:
-		return FailureAddressFamilyNotSupported
-	case unix.EADDRINUSE:
-		return FailureAddressInUse
-	case unix.EADDRNOTAVAIL:
-		return FailureAddressNotAvailable
-	case unix.EISCONN:
-		return FailureAlreadyConnected
-	case unix.EFAULT:
-		return FailureBadAddress
-	case unix.EBADF:
-		return FailureBadFileDescriptor
-	case unix.ECONNABORTED:
-		return FailureConnectionAborted
-	case unix.EALREADY:
-		return FailureConnectionAlreadyInProgress
-	case unix.EDESTADDRREQ:
-		return FailureDestinationAddressRequired
-	case unix.EINTR:
-		return FailureInterrupted
-	case unix.EINVAL:
-		return FailureInvalidArgument
-	case unix.EMSGSIZE:
-		return FailureMessageSize
-	case unix.ENETDOWN:
-		return FailureNetworkDown
-	case unix.ENETRESET:
-		return FailureNetworkReset
-	case unix.ENETUNREACH:
-		return FailureNetworkUnreachable
-	case unix.ENOBUFS:
-		return FailureNoBufferSpace
-	case unix.ENOPROTOOPT:
-		return FailureNoProtocolOption
-	case unix.ENOTSOCK:
-		return FailureNotASocket
-	case unix.ENOTCONN:
-		return FailureNotConnected
-	case unix.EWOULDBLOCK:
-		return FailureOperationWouldBlock
-	case unix.EACCES:
-		return FailurePermissionDenied
-	case unix.EPROTONOSUPPORT:
-		return FailureProtocolNotSupported
-	case unix.EPROTOTYPE:
-		return FailureWrongProtocolType
-	}
-	return ""
-}

internal/netxlite/errno_android_test.go

@@ -1,188 +0,0 @@
-// Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:54.927727 +0200 CEST m=+0.083189626
-
-package netxlite
-
-import (
-	"io"
-	"syscall"
-	"testing"
-
-	"golang.org/x/sys/unix"
-)
-
-func TestClassifySyscallError(t *testing.T) {
-	t.Run("for a non-syscall error", func(t *testing.T) {
-		if v := classifySyscallError(io.EOF); v != "" {
-			t.Fatalf("expected empty string, got '%s'", v)
-		}
-	})
-
-	t.Run("for ECONNREFUSED", func(t *testing.T) {
-		if v := classifySyscallError(unix.ECONNREFUSED); v != FailureConnectionRefused {
-			t.Fatalf("expected '%s', got '%s'", FailureConnectionRefused, v)
-		}
-	})
-
-	t.Run("for ECONNRESET", func(t *testing.T) {
-		if v := classifySyscallError(unix.ECONNRESET); v != FailureConnectionReset {
-			t.Fatalf("expected '%s', got '%s'", FailureConnectionReset, v)
-		}
-	})
-
-	t.Run("for EHOSTUNREACH", func(t *testing.T) {
-		if v := classifySyscallError(unix.EHOSTUNREACH); v != FailureHostUnreachable {
-			t.Fatalf("expected '%s', got '%s'", FailureHostUnreachable, v)
-		}
-	})
-
-	t.Run("for ETIMEDOUT", func(t *testing.T) {
-		if v := classifySyscallError(unix.ETIMEDOUT); v != FailureTimedOut {
-			t.Fatalf("expected '%s', got '%s'", FailureTimedOut, v)
-		}
-	})
-
-	t.Run("for EAFNOSUPPORT", func(t *testing.T) {
-		if v := classifySyscallError(unix.EAFNOSUPPORT); v != FailureAddressFamilyNotSupported {
-			t.Fatalf("expected '%s', got '%s'", FailureAddressFamilyNotSupported, v)
-		}
-	})
-
-	t.Run("for EADDRINUSE", func(t *testing.T) {
-		if v := classifySyscallError(unix.EADDRINUSE); v != FailureAddressInUse {
-			t.Fatalf("expected '%s', got '%s'", FailureAddressInUse, v)
-		}
-	})
-
-	t.Run("for EADDRNOTAVAIL", func(t *testing.T) {
-		if v := classifySyscallError(unix.EADDRNOTAVAIL); v != FailureAddressNotAvailable {
-			t.Fatalf("expected '%s', got '%s'", FailureAddressNotAvailable, v)
-		}
-	})
-
-	t.Run("for EISCONN", func(t *testing.T) {
-		if v := classifySyscallError(unix.EISCONN); v != FailureAlreadyConnected {
-			t.Fatalf("expected '%s', got '%s'", FailureAlreadyConnected, v)
-		}
-	})
-
-	t.Run("for EFAULT", func(t *testing.T) {
-		if v := classifySyscallError(unix.EFAULT); v != FailureBadAddress {
-			t.Fatalf("expected '%s', got '%s'", FailureBadAddress, v)
-		}
-	})
-
-	t.Run("for EBADF", func(t *testing.T) {
-		if v := classifySyscallError(unix.EBADF); v != FailureBadFileDescriptor {
-			t.Fatalf("expected '%s', got '%s'", FailureBadFileDescriptor, v)
-		}
-	})
-
-	t.Run("for ECONNABORTED", func(t *testing.T) {
-		if v := classifySyscallError(unix.ECONNABORTED); v != FailureConnectionAborted {
-			t.Fatalf("expected '%s', got '%s'", FailureConnectionAborted, v)
-		}
-	})
-
-	t.Run("for EALREADY", func(t *testing.T) {
-		if v := classifySyscallError(unix.EALREADY); v != FailureConnectionAlreadyInProgress {
-			t.Fatalf("expected '%s', got '%s'", FailureConnectionAlreadyInProgress, v)
-		}
-	})
-
-	t.Run("for EDESTADDRREQ", func(t *testing.T) {
-		if v := classifySyscallError(unix.EDESTADDRREQ); v != FailureDestinationAddressRequired {
-			t.Fatalf("expected '%s', got '%s'", FailureDestinationAddressRequired, v)
-		}
-	})
-
-	t.Run("for EINTR", func(t *testing.T) {
-		if v := classifySyscallError(unix.EINTR); v != FailureInterrupted {
-			t.Fatalf("expected '%s', got '%s'", FailureInterrupted, v)
-		}
-	})
-
-	t.Run("for EINVAL", func(t *testing.T) {
-		if v := classifySyscallError(unix.EINVAL); v != FailureInvalidArgument {
-			t.Fatalf("expected '%s', got '%s'", FailureInvalidArgument, v)
-		}
-	})
-
-	t.Run("for EMSGSIZE", func(t *testing.T) {
-		if v := classifySyscallError(unix.EMSGSIZE); v != FailureMessageSize {
-			t.Fatalf("expected '%s', got '%s'", FailureMessageSize, v)
-		}
-	})
-
-	t.Run("for ENETDOWN", func(t *testing.T) {
-		if v := classifySyscallError(unix.ENETDOWN); v != FailureNetworkDown {
-			t.Fatalf("expected '%s', got '%s'", FailureNetworkDown, v)
-		}
-	})
-
-	t.Run("for ENETRESET", func(t *testing.T) {
-		if v := classifySyscallError(unix.ENETRESET); v != FailureNetworkReset {
-			t.Fatalf("expected '%s', got '%s'", FailureNetworkReset, v)
-		}
-	})
-
-	t.Run("for ENETUNREACH", func(t *testing.T) {
-		if v := classifySyscallError(unix.ENETUNREACH); v != FailureNetworkUnreachable {
-			t.Fatalf("expected '%s', got '%s'", FailureNetworkUnreachable, v)
-		}
-	})
-
-	t.Run("for ENOBUFS", func(t *testing.T) {
-		if v := classifySyscallError(unix.ENOBUFS); v != FailureNoBufferSpace {
-			t.Fatalf("expected '%s', got '%s'", FailureNoBufferSpace, v)
-		}
-	})
-
-	t.Run("for ENOPROTOOPT", func(t *testing.T) {
-		if v := classifySyscallError(unix.ENOPROTOOPT); v != FailureNoProtocolOption {
-			t.Fatalf("expected '%s', got '%s'", FailureNoProtocolOption, v)
-		}
-	})
-
-	t.Run("for ENOTSOCK", func(t *testing.T) {
-		if v := classifySyscallError(unix.ENOTSOCK); v != FailureNotASocket {
-			t.Fatalf("expected '%s', got '%s'", FailureNotASocket, v)
-		}
-	})
-
-	t.Run("for ENOTCONN", func(t *testing.T) {
-		if v := classifySyscallError(unix.ENOTCONN); v != FailureNotConnected {
-			t.Fatalf("expected '%s', got '%s'", FailureNotConnected, v)
-		}
-	})
-
-	t.Run("for EWOULDBLOCK", func(t *testing.T) {
-		if v := classifySyscallError(unix.EWOULDBLOCK); v != FailureOperationWouldBlock {
-			t.Fatalf("expected '%s', got '%s'", FailureOperationWouldBlock, v)
-		}
-	})
-
-	t.Run("for EACCES", func(t *testing.T) {
-		if v := classifySyscallError(unix.EACCES); v != FailurePermissionDenied {
-			t.Fatalf("expected '%s', got '%s'", FailurePermissionDenied, v)
-		}
-	})
-
-	t.Run("for EPROTONOSUPPORT", func(t *testing.T) {
-		if v := classifySyscallError(unix.EPROTONOSUPPORT); v != FailureProtocolNotSupported {
-			t.Fatalf("expected '%s', got '%s'", FailureProtocolNotSupported, v)
-		}
-	})
-
-	t.Run("for EPROTOTYPE", func(t *testing.T) {
-		if v := classifySyscallError(unix.EPROTOTYPE); v != FailureWrongProtocolType {
-			t.Fatalf("expected '%s', got '%s'", FailureWrongProtocolType, v)
-		}
-	})
-
-	t.Run("for the zero errno value", func(t *testing.T) {
-		if v := classifySyscallError(syscall.Errno(0)); v != "" {
-			t.Fatalf("expected empty string, got '%s'", v)
-		}
-	})
-}

internal/netxlite/errno_darwin.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:54.974877 +0200 CEST m=+0.130340293
+// Generated: 2021-11-10 12:32:20.240263878 +0100 CET m=+0.000223034
 
 package netxlite
 

internal/netxlite/errno_darwin_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.045861 +0200 CEST m=+0.201324876
+// Generated: 2021-11-10 12:32:20.868774842 +0100 CET m=+0.628733978
 
 package netxlite
 

internal/netxlite/errno_freebsd.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.086625 +0200 CEST m=+0.242089460
+// Generated: 2021-11-10 12:32:21.21962196 +0100 CET m=+0.979581106
 
 package netxlite
 

internal/netxlite/errno_freebsd_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.158003 +0200 CEST m=+0.313467668
+// Generated: 2021-11-10 12:32:21.590776904 +0100 CET m=+1.350736040
 
 package netxlite
 

internal/netxlite/errno_ios.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.199889 +0200 CEST m=+0.355353960
+// Generated: 2021-11-10 12:32:21.956427226 +0100 CET m=+1.716386362
 
 package netxlite
 

internal/netxlite/errno_ios_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.26791 +0200 CEST m=+0.423375168
+// Generated: 2021-11-10 12:32:22.413994086 +0100 CET m=+2.173953232
 
 package netxlite
 

internal/netxlite/errno_linux.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.309355 +0200 CEST m=+0.464820460
+// Generated: 2021-11-10 12:32:22.795026799 +0100 CET m=+2.554985925
 
 package netxlite
 

internal/netxlite/errno_linux_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.377268 +0200 CEST m=+0.532734710
+// Generated: 2021-11-10 12:32:23.366945689 +0100 CET m=+3.126904885
 
 package netxlite
 

internal/netxlite/errno_windows.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.419258 +0200 CEST m=+0.574724501
+// Generated: 2021-11-10 12:32:23.769840098 +0100 CET m=+3.529799255
 
 package netxlite
 

internal/netxlite/errno_windows_test.go

@@ -1,5 +1,5 @@
 // Code generated by go generate; DO NOT EDIT.
-// Generated: 2021-10-20 14:12:55.470884 +0200 CEST m=+0.626351293
+// Generated: 2021-11-10 12:32:24.267604596 +0100 CET m=+4.027563753
 
 package netxlite
 

internal/netxlite/internal/generrno/main.go

@@ -173,7 +173,7 @@ var Specs = []*ErrorSpec{
 // of the related golang.org/x/sys/$name library.
 func mapSystemToLibrary(system string) string {
 	switch system {
-	case "android", "darwin", "freebsd", "ios", "linux":
+	case "darwin", "freebsd", "ios", "linux":
 		return "unix"
 	case "windows":
 		return "windows"
@@ -362,7 +362,6 @@ func writeSystemSpecificTestFile(system string) {
 
 // SupportedSystems contains the list of supported systems.
 var SupportedSystems = []string{
-	"android",
 	"darwin",
 	"freebsd",
 	"ios",