cmd/go/internal/toolchain: make a best effort to parse 'go run' and 'go install'...

When the argument to 'go install' or 'go run' looks like a versioned
package, we make a best effort to switch to a toolchain compatible
with the module containing that package, by fetching its go.mod file
and checking the go version it specifies.

At this point in the code, we have not yet parsed the arguments given
on the command line: instead, we just make a best effort to find one
we can use to select a toolchain version. Since that toolchain may be
newer, the command to install it may also include flags that are only
supported by that Go version — and we don't want to fail due to an
error that would be resolved by switching to a more appropriate
toolchain.

So at this point in the code we can't parse the flags in a way that
will surface errors, but we want to make a best effort to parse the
ones that we know about. It turns out that “parse the flags we know
about” is already a familiar problem: that's also what we do in
'go test', so we can reuse the cmdflag library from that to do the
best-effort pass of parsing.

If it turns out that we don't need to switch toolchains after all,
cmd/go's main function will parse the flags again, and will report any
errors at that point.

This fixes a regression, introduced in CL 497879, which caused
'go install -modcacherw pkg@version' to unset the write bit for
directories created while selecting the toolchain to use.

Fixes #64282.
Updates #57001.

Change-Id: Icc409c57858aa15c7d58a97a61964b4bc2560547
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest,gotip-windows-amd64-longtest
Reviewed-on: https://go-review.googlesource.com/c/go/+/546635
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>

diff --git a/src/cmd/go/internal/base/goflags.go b/src/cmd/go/internal/base/goflags.go
index eced2c5d5822682792727bb6335589ea14f88707..3d5a76d54b758d4ec6b416d36b0ad932278f0ddb 100644 (file)
--- a/src/cmd/go/internal/base/goflags.go
+++ b/src/cmd/go/internal/base/goflags.go
@@ -88,7 +88,7 @@ type boolFlag interface {
 }
 
 // SetFromGOFLAGS sets the flags in the given flag set using settings in $GOFLAGS.
-func SetFromGOFLAGS(flags *flag.FlagSet) {
+func SetFromGOFLAGS(flags *flag.FlagSet, ignoreErrors bool) {
        InitGOFLAGS()
 
        // This loop is similar to flag.Parse except that it ignores
@@ -121,22 +121,22 @@ func SetFromGOFLAGS(flags *flag.FlagSet) {
 
                if fb, ok := f.Value.(boolFlag); ok && fb.IsBoolFlag() {
                        if hasValue {
-                               if err := flags.Set(f.Name, value); err != nil {
+                               if err := flags.Set(f.Name, value); err != nil && !ignoreErrors {
                                        fmt.Fprintf(flags.Output(), "go: invalid boolean value %q for flag %s (from %s): %v\n", value, name, where, err)
                                        flags.Usage()
                                }
                        } else {
-                               if err := flags.Set(f.Name, "true"); err != nil {
+                               if err := flags.Set(f.Name, "true"); err != nil && !ignoreErrors {
                                        fmt.Fprintf(flags.Output(), "go: invalid boolean flag %s (from %s): %v\n", name, where, err)
                                        flags.Usage()
                                }
                        }
                } else {
-                       if !hasValue {
+                       if !hasValue && !ignoreErrors {
                                fmt.Fprintf(flags.Output(), "go: flag needs an argument: %s (from %s)\n", name, where)
                                flags.Usage()
                        }
-                       if err := flags.Set(f.Name, value); err != nil {
+                       if err := flags.Set(f.Name, value); err != nil && !ignoreErrors {
                                fmt.Fprintf(flags.Output(), "go: invalid value %q for flag %s (from %s): %v\n", value, name, where, err)
                                flags.Usage()
                        }

diff --git a/src/cmd/go/internal/modfetch/fetch.go b/src/cmd/go/internal/modfetch/fetch.go
index eeab6da62a2daddf5cc3de7df47b512b20157c5e..b3c77dfbc21786ef6d8a43c6d6d0d8633160d87c 100644 (file)
--- a/src/cmd/go/internal/modfetch/fetch.go
+++ b/src/cmd/go/internal/modfetch/fetch.go
@@ -525,7 +525,7 @@ func readGoSum(dst map[module.Version][]string, file string, data []byte) {
                                // ignore malformed line so that go mod tidy can fix go.sum
                                continue
                        } else {
-                               base.Fatalf("malformed go.sum:\n%s:%d: wrong number of fields %v\n", file, lineno, len(f))
+                               base.Fatalf("go: malformed go.sum:\n%s:%d: wrong number of fields %v\n", file, lineno, len(f))
                        }
                }
                if f[2] == emptyGoModHash {
@@ -574,32 +574,32 @@ func checkMod(ctx context.Context, mod module.Version) {
        // Do the file I/O before acquiring the go.sum lock.
        ziphash, err := CachePath(ctx, mod, "ziphash")
        if err != nil {
-               base.Fatalf("verifying %v", module.VersionError(mod, err))
+               base.Fatalf("go: verifying %v", module.VersionError(mod, err))
        }
        data, err := lockedfile.Read(ziphash)
        if err != nil {
-               base.Fatalf("verifying %v", module.VersionError(mod, err))
+               base.Fatalf("go: verifying %v", module.VersionError(mod, err))
        }
        data = bytes.TrimSpace(data)
        if !isValidSum(data) {
                // Recreate ziphash file from zip file and use that to check the mod sum.
                zip, err := CachePath(ctx, mod, "zip")
                if err != nil {
-                       base.Fatalf("verifying %v", module.VersionError(mod, err))
+                       base.Fatalf("go: verifying %v", module.VersionError(mod, err))
                }
                err = hashZip(mod, zip, ziphash)
                if err != nil {
-                       base.Fatalf("verifying %v", module.VersionError(mod, err))
+                       base.Fatalf("go: verifying %v", module.VersionError(mod, err))
                }
                return
        }
        h := string(data)
        if !strings.HasPrefix(h, "h1:") {
-               base.Fatalf("verifying %v", module.VersionError(mod, fmt.Errorf("unexpected ziphash: %q", h)))
+               base.Fatalf("go: verifying %v", module.VersionError(mod, fmt.Errorf("unexpected ziphash: %q", h)))
        }
 
        if err := checkModSum(mod, h); err != nil {
-               base.Fatalf("%s", err)
+               base.Fatal(err)
        }
 }
 
@@ -684,7 +684,7 @@ func haveModSumLocked(mod module.Version, h string) bool {
                        return true
                }
                if strings.HasPrefix(vh, "h1:") {
-                       base.Fatalf("verifying %s@%s: checksum mismatch\n\tdownloaded: %v\n\t%s:     %v"+goSumMismatch, mod.Path, mod.Version, h, sumFileName, vh)
+                       base.Fatalf("go: verifying %s@%s: checksum mismatch\n\tdownloaded: %v\n\t%s:     %v"+goSumMismatch, mod.Path, mod.Version, h, sumFileName, vh)
                }
        }
        // Also check workspace sums.
@@ -696,7 +696,7 @@ func haveModSumLocked(mod module.Version, h string) bool {
                        if h == vh {
                                foundMatch = true
                        } else if strings.HasPrefix(vh, "h1:") {
-                               base.Fatalf("verifying %s@%s: checksum mismatch\n\tdownloaded: %v\n\t%s:     %v"+goSumMismatch, mod.Path, mod.Version, h, goSumFile, vh)
+                               base.Fatalf("go: verifying %s@%s: checksum mismatch\n\tdownloaded: %v\n\t%s:     %v"+goSumMismatch, mod.Path, mod.Version, h, goSumFile, vh)
                        }
                }
        }
@@ -895,7 +895,7 @@ func TrimGoSum(keep map[module.Version]bool) {
        defer goSum.mu.Unlock()
        inited, err := initGoSum()
        if err != nil {
-               base.Fatalf("%s", err)
+               base.Fatal(err)
        }
        if !inited {
                return

diff --git a/src/cmd/go/internal/test/testflag.go b/src/cmd/go/internal/test/testflag.go
index 425378889d9af06da941763ab25c90ca4f81142c..22c3ab13021628c983fbf7d4ff38e8b785c6a9d7 100644 (file)
--- a/src/cmd/go/internal/test/testflag.go
+++ b/src/cmd/go/internal/test/testflag.go
@@ -222,7 +222,7 @@ func (f *shuffleFlag) Set(value string) error {
 //     go test fmt -custom-flag-for-fmt-test
 //     go test -x math
 func testFlags(args []string) (packageNames, passToTest []string) {
-       base.SetFromGOFLAGS(&CmdTest.Flag)
+       base.SetFromGOFLAGS(&CmdTest.Flag, false)
        addFromGOFLAGS := map[string]bool{}
        CmdTest.Flag.Visit(func(f *flag.Flag) {
                if short := strings.TrimPrefix(f.Name, "test."); passFlagToTest[short] {

diff --git a/src/cmd/go/internal/toolchain/exec.go b/src/cmd/go/internal/toolchain/exec.go
index 820fe93e87c377e770b7fe1573de50a74f12dc3d..acfb9e943ca77af54ba0001f97c0be675d35cd15 100644 (file)
--- a/src/cmd/go/internal/toolchain/exec.go
+++ b/src/cmd/go/internal/toolchain/exec.go
@@ -44,12 +44,12 @@ func execGoToolchain(gotoolchain, dir, exe string) {
                                if e.ProcessState.Exited() {
                                        os.Exit(e.ProcessState.ExitCode())
                                }
-                               base.Fatalf("exec %s: %s", gotoolchain, e.ProcessState)
+                               base.Fatalf("go: exec %s: %s", gotoolchain, e.ProcessState)
                        }
-                       base.Fatalf("exec %s: %s", exe, err)
+                       base.Fatalf("go: exec %s: %s", exe, err)
                }
                os.Exit(0)
        }
        err := syscall.Exec(exe, os.Args, os.Environ())
-       base.Fatalf("exec %s: %v", gotoolchain, err)
+       base.Fatalf("go: exec %s: %v", gotoolchain, err)
 }

diff --git a/src/cmd/go/internal/toolchain/select.go b/src/cmd/go/internal/toolchain/select.go
index 9fd1549a61bbc1143747d04291f36b36d2ec5fea..84fa7f685c97b7ec4e02f83fff3510bfb0ac0c26 100644 (file)
--- a/src/cmd/go/internal/toolchain/select.go
+++ b/src/cmd/go/internal/toolchain/select.go
@@ -8,10 +8,10 @@ package toolchain
 import (
        "context"
        "errors"
+       "flag"
        "fmt"
        "go/build"
        "io/fs"
-       "log"
        "os"
        "path/filepath"
        "runtime"
@@ -20,10 +20,12 @@ import (
 
        "cmd/go/internal/base"
        "cmd/go/internal/cfg"
+       "cmd/go/internal/cmdflag"
        "cmd/go/internal/gover"
        "cmd/go/internal/modfetch"
        "cmd/go/internal/modload"
        "cmd/go/internal/run"
+       "cmd/go/internal/work"
 
        "golang.org/x/mod/module"
 )
@@ -85,9 +87,6 @@ func FilterEnv(env []string) []string {
 // It must be called early in startup.
 // See https://go.dev/doc/toolchain#select.
 func Select() {
-       log.SetPrefix("go: ")
-       defer log.SetPrefix("")
-
        if !modload.WillBeEnabled() {
                return
        }
@@ -133,15 +132,15 @@ func Select() {
                        v := gover.FromToolchain(min)
                        if v == "" {
                                if plus {
-                                       base.Fatalf("invalid GOTOOLCHAIN %q: invalid minimum toolchain %q", gotoolchain, min)
+                                       base.Fatalf("go: invalid GOTOOLCHAIN %q: invalid minimum toolchain %q", gotoolchain, min)
                                }
-                               base.Fatalf("invalid GOTOOLCHAIN %q", gotoolchain)
+                               base.Fatalf("go: invalid GOTOOLCHAIN %q", gotoolchain)
                        }
                        minToolchain = min
                        minVers = v
                }
                if plus && suffix != "auto" && suffix != "path" {
-                       base.Fatalf("invalid GOTOOLCHAIN %q: only version suffixes are +auto and +path", gotoolchain)
+                       base.Fatalf("go: invalid GOTOOLCHAIN %q: only version suffixes are +auto and +path", gotoolchain)
                }
                mode = suffix
        }
@@ -172,7 +171,7 @@ func Select() {
                                // has a suffix like "go1.21.1-foo" and toolchain is "go1.21.1".)
                                toolVers := gover.FromToolchain(toolchain)
                                if toolVers == "" || (!strings.HasPrefix(toolchain, "go") && !strings.Contains(toolchain, "-go")) {
-                                       base.Fatalf("invalid toolchain %q in %s", toolchain, base.ShortPath(file))
+                                       base.Fatalf("go: invalid toolchain %q in %s", toolchain, base.ShortPath(file))
                                }
                                if gover.Compare(toolVers, minVers) > 0 {
                                        gotoolchain = toolchain
@@ -194,7 +193,7 @@ func Select() {
        // so that we have initialized gover.Startup for use in error messages.
        if target := os.Getenv(targetEnv); target != "" && TestVersionSwitch != "loop" {
                if gover.LocalToolchain() != target {
-                       base.Fatalf("toolchain %v invoked to provide %v", gover.LocalToolchain(), target)
+                       base.Fatalf("go: toolchain %v invoked to provide %v", gover.LocalToolchain(), target)
                }
                os.Unsetenv(targetEnv)
 
@@ -225,7 +224,7 @@ func Select() {
        // We want to disallow mistakes / bad ideas like GOTOOLCHAIN=bash,
        // since we will find that in the path lookup.
        if !strings.HasPrefix(gotoolchain, "go1") && !strings.Contains(gotoolchain, "-go1") {
-               base.Fatalf("invalid GOTOOLCHAIN %q", gotoolchain)
+               base.Fatalf("go: invalid GOTOOLCHAIN %q", gotoolchain)
        }
 
        Exec(gotoolchain)
@@ -244,8 +243,6 @@ var TestVersionSwitch string
 // as a source of Go toolchains. Otherwise Exec tries the PATH but then downloads
 // a toolchain if necessary.
 func Exec(gotoolchain string) {
-       log.SetPrefix("go: ")
-
        writeBits = sysWriteBits()
 
        count, _ := strconv.Atoi(os.Getenv(countEnv))
@@ -253,7 +250,7 @@ func Exec(gotoolchain string) {
                fmt.Fprintf(os.Stderr, "go: switching from go%v to %v [depth %d]\n", gover.Local(), gotoolchain, count)
        }
        if count >= maxSwitch {
-               base.Fatalf("too many toolchain switches")
+               base.Fatalf("go: too many toolchain switches")
        }
        os.Setenv(countEnv, fmt.Sprint(count+1))
 
@@ -276,7 +273,7 @@ func Exec(gotoolchain string) {
        case "loop", "mismatch":
                exe, err := os.Executable()
                if err != nil {
-                       base.Fatalf("%v", err)
+                       base.Fatal(err)
                }
                execGoToolchain(gotoolchain, os.Getenv("GOROOT"), exe)
        }
@@ -291,7 +288,7 @@ func Exec(gotoolchain string) {
        // GOTOOLCHAIN=auto looks in PATH and then falls back to download.
        // GOTOOLCHAIN=path only looks in PATH.
        if pathOnly {
-               base.Fatalf("cannot find %q in PATH", gotoolchain)
+               base.Fatalf("go: cannot find %q in PATH", gotoolchain)
        }
 
        // Set up modules without an explicit go.mod, to download distribution.
@@ -310,9 +307,9 @@ func Exec(gotoolchain string) {
        dir, err := modfetch.Download(context.Background(), m)
        if err != nil {
                if errors.Is(err, fs.ErrNotExist) {
-                       base.Fatalf("download %s for %s/%s: toolchain not available", gotoolchain, runtime.GOOS, runtime.GOARCH)
+                       base.Fatalf("go: download %s for %s/%s: toolchain not available", gotoolchain, runtime.GOOS, runtime.GOARCH)
                }
-               base.Fatalf("download %s: %v", gotoolchain, err)
+               base.Fatalf("go: download %s: %v", gotoolchain, err)
        }
 
        // On first use after download, set the execute bits on the commands
@@ -321,7 +318,7 @@ func Exec(gotoolchain string) {
        if runtime.GOOS != "windows" {
                info, err := os.Stat(filepath.Join(dir, "bin/go"))
                if err != nil {
-                       base.Fatalf("download %s: %v", gotoolchain, err)
+                       base.Fatalf("go: download %s: %v", gotoolchain, err)
                }
                if info.Mode()&0111 == 0 {
                        // allowExec sets the exec permission bits on all files found in dir.
@@ -342,7 +339,7 @@ func Exec(gotoolchain string) {
                                        return nil
                                })
                                if err != nil {
-                                       base.Fatalf("download %s: %v", gotoolchain, err)
+                                       base.Fatalf("go: download %s: %v", gotoolchain, err)
                                }
                        }
 
@@ -384,7 +381,7 @@ func Exec(gotoolchain string) {
                        err = raceSafeCopy(srcUGoMod, srcGoMod)
                }
                if err != nil {
-                       base.Fatalf("download %s: %v", gotoolchain, err)
+                       base.Fatalf("go: download %s: %v", gotoolchain, err)
                }
        }
 
@@ -475,7 +472,7 @@ func modGoToolchain() (file, goVers, toolchain string) {
 
        data, err := os.ReadFile(file)
        if err != nil {
-               base.Fatalf("%v", err)
+               base.Fatal(err)
        }
        return file, gover.GoModLookup(data, "go"), gover.GoModLookup(data, "toolchain")
 }
@@ -492,6 +489,7 @@ func goInstallVersion() bool {
 
        // Check for pkg@version.
        var arg string
+       var cmdFlags *flag.FlagSet
        switch os.Args[1] {
        default:
                return false
@@ -500,6 +498,7 @@ func goInstallVersion() bool {
                // across a toolchain switch. To make that work, assume the pkg@version
                // is the last argument and skip the flag parsing.
                arg = os.Args[len(os.Args)-1]
+               cmdFlags = &work.CmdInstall.Flag
        case "run":
                // For run, the pkg@version can be anywhere on the command line,
                // because it is preceded by run flags and followed by arguments to the
@@ -507,6 +506,7 @@ func goInstallVersion() bool {
                // flags a little bit, to know whether each flag takes an optional argument.
                // We can still allow unknown flags as long as they have an explicit =value.
                args := os.Args[2:]
+               cmdFlags = &run.CmdRun.Flag
                for i := 0; i < len(args); i++ {
                        a := args[i]
                        if !strings.HasPrefix(a, "-") {
@@ -554,6 +554,20 @@ func goInstallVersion() bool {
                return false
        }
 
+       // Make a best effort to parse flags so that module flags like -modcacherw
+       // will take effect (see https://go.dev/issue/64282).
+       args := os.Args[2:]
+       for len(args) > 0 {
+               var err error
+               _, args, err = cmdflag.ParseOne(cmdFlags, args)
+               if errors.Is(err, cmdflag.ErrFlagTerminator) {
+                       break
+               }
+               // Ignore all other errors: they may be new flags — or updated syntax for
+               // existing flags — intended for a newer Go toolchain.
+       }
+       base.SetFromGOFLAGS(cmdFlags, true)
+
        // It would be correct to simply return true here, bypassing use
        // of the current go.mod or go.work, and let "go run" or "go install"
        // do the rest, including a toolchain switch.

diff --git a/src/cmd/go/internal/vet/vetflag.go b/src/cmd/go/internal/vet/vetflag.go
index eb7af6508d00be6debf34945e1188c9babd63ead..601ae9aa64ba1632ed29b11aee89c82fbef6ebc5 100644 (file)
--- a/src/cmd/go/internal/vet/vetflag.go
+++ b/src/cmd/go/internal/vet/vetflag.go
@@ -116,7 +116,7 @@ func vetFlags(args []string) (passToVet, packageNames []string) {
 
        // Record the set of vet tool flags set by GOFLAGS. We want to pass them to
        // the vet tool, but only if they aren't overridden by an explicit argument.
-       base.SetFromGOFLAGS(&CmdVet.Flag)
+       base.SetFromGOFLAGS(&CmdVet.Flag, false)
        addFromGOFLAGS := map[string]bool{}
        CmdVet.Flag.Visit(func(f *flag.Flag) {
                if isVetFlag[f.Name] {

diff --git a/src/cmd/go/main.go b/src/cmd/go/main.go
index d380aae489436f8e531803beaef4f86dfd4c1bb6..b309cb867ab264fa381daf7a00e960c133b78bbc 100644 (file)
--- a/src/cmd/go/main.go
+++ b/src/cmd/go/main.go
@@ -234,7 +234,7 @@ func invoke(cmd *base.Command, args []string) {
        if cmd.CustomFlags {
                args = args[1:]
        } else {
-               base.SetFromGOFLAGS(&cmd.Flag)
+               base.SetFromGOFLAGS(&cmd.Flag, false)
                cmd.Flag.Parse(args[1:])
                args = cmd.Flag.Args()
        }

diff --git a/src/cmd/go/testdata/script/install_modcacherw_issue64282.txt b/src/cmd/go/testdata/script/install_modcacherw_issue64282.txt
new file mode 100644 (file)
index 0000000..ea644f7
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_modcacherw_issue64282.txt
@@ -0,0 +1,32 @@
+# Regression test for https://go.dev/issue/64282:
+# 'go install' and 'go run' with pkg@version arguments should make
+# a best effort to parse flags before they download modules to
+# identify which toolchain version to use, because those flags
+# may affect the downloaded contents.
+
+# However, the best-effort flag parsing should not interfere with
+# actual flag parsing if we don't switch toolchains. In particular,
+# unrecognized flags should still be diagnosed after the module for
+# the requested package has been downloaded and checked for toolchain
+# upgrades.
+
+! go install -cake=delicious -modcacherw example.com/printversion@v0.1.0
+stderr '^flag provided but not defined: -cake$'
+
+[!short] go install -modcacherw example.com/printversion@v0.1.0
+       # Because the -modcacherw flag was set, we should be able to modify the contents
+       # of a directory within the module cache.
+cp $WORK/extraneous.txt $GOPATH/pkg/mod/example.com/printversion@v0.1.0/extraneous_file.go
+
+
+# We should also apply flags from GOFLAGS at this step.
+
+go clean -modcache
+env GOFLAGS=-modcacherw
+! go install -cake=delicious example.com/printversion@v0.1.0
+stderr '^flag provided but not defined: -cake$'
+cp $WORK/extraneous.txt $GOPATH/pkg/mod/example.com/printversion@v0.1.0/extraneous_file.go
+
+
+-- $WORK/extraneous.txt --
+This is not a Go source file.

diff --git a/src/cmd/go/testdata/script/malformed_gosum_issue62345.txt b/src/cmd/go/testdata/script/malformed_gosum_issue62345.txt
index 23c41beae90ae39e3aa01cb7640195223515eb3c..35fad2919326f3e04801e6319c395b4735a173b9 100644 (file)
--- a/src/cmd/go/testdata/script/malformed_gosum_issue62345.txt
+++ b/src/cmd/go/testdata/script/malformed_gosum_issue62345.txt
@@ -1,5 +1,5 @@
 ! go mod download
-stderr '^malformed go.sum:\n.*go.sum:3: wrong number of fields 5\n$'
+stderr '^go: malformed go.sum:\n.*go.sum:3: wrong number of fields 5\n$'
 
 go mod tidy
 cmp go.sum go.sum.after-tidy

diff --git a/src/cmd/go/testdata/script/work_sum_mismatch.txt b/src/cmd/go/testdata/script/work_sum_mismatch.txt
index ca5d71dc5e73c73a213488ca6518ad3e000367c0..d4997aa37246e0328125a8d201df9bfa47e81c7c 100644 (file)
--- a/src/cmd/go/testdata/script/work_sum_mismatch.txt
+++ b/src/cmd/go/testdata/script/work_sum_mismatch.txt
@@ -4,7 +4,7 @@
 cmpenv stderr want-error
 
 -- want-error --
-verifying rsc.io/sampler@v1.3.0/go.mod: checksum mismatch
+go: verifying rsc.io/sampler@v1.3.0/go.mod: checksum mismatch
        downloaded: h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
        $WORK${/}gopath${/}src${/}a${/}go.sum:     h1:U1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 
@@ -58,4 +58,4 @@ import (
 
 func main() {
        fmt.Println(quote.Hello())
-}
\ No newline at end of file
+}