build: update to go1.21rc3 and make go1.19 the minimum required version

Signed-off-by: Anagh Kumar Baranwal <6824881+darthShadow@users.noreply.github.com>

.github/workflows/build.yml

@@ -27,12 +27,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        job_name: ['linux', 'linux_386', 'mac_amd64', 'mac_arm64', 'windows', 'other_os', 'go1.18', 'go1.19']
+        job_name: ['linux', 'linux_386', 'mac_amd64', 'mac_arm64', 'windows', 'other_os', 'go1.19', 'go1.20']
 
         include:
           - job_name: linux
             os: ubuntu-latest
-            go: '1.20'
+            go: '1.21.0-rc.3'
             gotags: cmount
             build_flags: '-include "^linux/"'
             check: true
@@ -43,14 +43,14 @@ jobs:
 
           - job_name: linux_386
             os: ubuntu-latest
-            go: '1.20'
+            go: '1.21.0-rc.3'
             goarch: 386
             gotags: cmount
             quicktest: true
 
           - job_name: mac_amd64
             os: macos-11
-            go: '1.20'
+            go: '1.21.0-rc.3'
             gotags: 'cmount'
             build_flags: '-include "^darwin/amd64" -cgo'
             quicktest: true
@@ -59,14 +59,14 @@ jobs:
 
           - job_name: mac_arm64
             os: macos-11
-            go: '1.20'
+            go: '1.21.0-rc.3'
             gotags: 'cmount'
             build_flags: '-include "^darwin/arm64" -cgo -macos-arch arm64 -cgo-cflags=-I/usr/local/include -cgo-ldflags=-L/usr/local/lib'
             deploy: true
 
           - job_name: windows
             os: windows-latest
-            go: '1.20'
+            go: '1.21.0-rc.3'
             gotags: cmount
             cgo: '0'
             build_flags: '-include "^windows/"'
@@ -76,23 +76,23 @@ jobs:
 
           - job_name: other_os
             os: ubuntu-latest
-            go: '1.20'
+            go: '1.21.0-rc.3'
             build_flags: '-exclude "^(windows/|darwin/|linux/)"'
             compile_all: true
             deploy: true
 
-          - job_name: go1.18
-            os: ubuntu-latest
-            go: '1.18'
-            quicktest: true
-            racequicktest: true
-
           - job_name: go1.19
             os: ubuntu-latest
             go: '1.19'
             quicktest: true
             racequicktest: true
 
+          - job_name: go1.20
+            os: ubuntu-latest
+            go: '1.20'
+            quicktest: true
+            racequicktest: true
+
     name: ${{ matrix.job_name }}
 
     runs-on: ${{ matrix.os }}
@@ -130,6 +130,11 @@ jobs:
       - name: Install Libraries on macOS
         shell: bash
         run: |
+          # https://github.com/Homebrew/brew/issues/15621#issuecomment-1619266788
+          # https://github.com/orgs/Homebrew/discussions/4612#discussioncomment-6319008
+          unset HOMEBREW_NO_INSTALL_FROM_API
+          brew untap --force homebrew/core
+          brew untap --force homebrew/cask
           brew update
           brew install --cask macfuse
         if: matrix.os == 'macos-11'
@@ -239,7 +244,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21.0-rc.3'
           check-latest: true
 
       - name: Install govulncheck
@@ -264,7 +269,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
+          go-version: '1.21.0-rc.3'
 
       - name: Go module cache
         uses: actions/cache@v3

backend/azureblob/azureblob.go

@@ -1,5 +1,5 @@
-//go:build !plan9 && !solaris && !js && go1.18
+//go:build !plan9 && !solaris && !js
-// +build !plan9,!solaris,!js,go1.18
+// +build !plan9,!solaris,!js
 
 // Package azureblob provides an interface to the Microsoft Azure blob object storage system
 package azureblob

backend/azureblob/azureblob_internal_test.go

@@ -1,5 +1,5 @@
-//go:build !plan9 && !solaris && !js && go1.18
+//go:build !plan9 && !solaris && !js
-// +build !plan9,!solaris,!js,go1.18
+// +build !plan9,!solaris,!js
 
 package azureblob
 

backend/azureblob/azureblob_test.go

@@ -1,7 +1,7 @@
 // Test AzureBlob filesystem interface
 
-//go:build !plan9 && !solaris && !js && go1.18
+//go:build !plan9 && !solaris && !js
-// +build !plan9,!solaris,!js,go1.18
+// +build !plan9,!solaris,!js
 
 package azureblob
 

backend/azureblob/azureblob_unsupported.go

@@ -1,7 +1,7 @@
 // Build for azureblob for unsupported platforms to stop go complaining
 // about "no buildable Go source files "
 
-//go:build plan9 || solaris || js || !go1.18
+//go:build plan9 || solaris || js
-// +build plan9 solaris js !go1.18
+// +build plan9 solaris js
 
 package azureblob

backend/cache/cache_upload_test.go

@@ -160,11 +160,11 @@ func TestInternalUploadQueueMoreFiles(t *testing.T) {
 	minSize := 5242880
 	maxSize := 10485760
 	totalFiles := 10
-	rand.Seed(time.Now().Unix())
+	randInstance := rand.New(rand.NewSource(time.Now().Unix()))
 
 	lastFile := ""
 	for i := 0; i < totalFiles; i++ {
-		size := int64(rand.Intn(maxSize-minSize) + minSize)
+		size := int64(randInstance.Intn(maxSize-minSize) + minSize)
 		testReader := runInstance.randomReader(t, size)
 		remote := "test/" + strconv.Itoa(i) + ".bin"
 		runInstance.writeRemoteReader(t, rootFs, remote, testReader)

fs/rc/internal.go

@@ -389,10 +389,7 @@ func rcSetSoftMemoryLimit(ctx context.Context, in Params) (out Params, err error
 	if err != nil {
 		return nil, err
 	}
-	oldMemLimit, err := debug.SetMemoryLimit(memLimit)
+	oldMemLimit := debug.SetMemoryLimit(memLimit)
-	if err != nil {
-		return nil, err
-	}
 	out = Params{
 		"existing-mem-limit": oldMemLimit,
 	}

fs/versioncheck.go

@@ -1,8 +1,8 @@
-//go:build !go1.18
+//go:build !go1.19
-// +build !go1.18
+// +build !go1.19
 
 package fs
 
-// Upgrade to Go version 1.18 to compile rclone - latest stable go
+// Upgrade to Go version 1.19 to compile rclone - latest stable go
 // compiler recommended.
-func init() { Go_version_1_18_required_for_compilation() }
+func init() { Go_version_1_19_required_for_compilation() }

fstest/test_all/test_all.go

@@ -73,7 +73,7 @@ func main() {
 	configfile.Install()
 
 	// Seed the random number generator
-	rand.Seed(time.Now().UTC().UnixNano())
+	randInstance := rand.New(rand.NewSource(time.Now().UTC().UnixNano()))
 
 	// Filter selection
 	if *testRemotes != "" {
@@ -103,7 +103,7 @@ func main() {
 
 	// Runs we will do for this test in random order
 	runs := conf.MakeRuns()
-	rand.Shuffle(len(runs), runs.Swap)
+	randInstance.Shuffle(len(runs), runs.Swap)
 
 	// Create Report
 	report := NewReport()

go.mod

@@ -1,6 +1,6 @@
 module github.com/rclone/rclone
 
-go 1.18
+go 1.19
 
 require (
 	bazil.org/fuse v0.0.0-20221209211307-2abb8038c751

lib/debug/common.go

@@ -10,3 +10,9 @@ import (
 func SetGCPercent(percent int) int {
 	return debug.SetGCPercent(percent)
 }
+
+// SetMemoryLimit calls the runtime/debug.SetMemoryLimit function to set the
+// soft-memory limit.
+func SetMemoryLimit(limit int64) int64 {
+	return debug.SetMemoryLimit(limit)
+}

lib/debug/go1.19.go

@@ -1,14 +0,0 @@
-//go:build go1.19
-// +build go1.19
-
-package debug
-
-import (
-	"runtime/debug"
-)
-
-// SetMemoryLimit calls the runtime/debug.SetMemoryLimit function to set the
-// soft-memory limit.
-func SetMemoryLimit(limit int64) (int64, error) {
-	return debug.SetMemoryLimit(limit), nil
-}

lib/debug/go1.19_compat.go

@@ -1,14 +0,0 @@
-//go:build !go1.19
-// +build !go1.19
-
-package debug
-
-import (
-	"fmt"
-	"runtime"
-)
-
-// SetMemoryLimit is a no-op on Go version < 1.19.
-func SetMemoryLimit(limit int64) (int64, error) {
-	return limit, fmt.Errorf("not implemented on Go version below 1.19: %s", runtime.Version())
-}

lib/rest/rest.go

@@ -11,7 +11,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"mime/multipart"
 	"net/http"
 	"net/url"
@@ -163,7 +162,7 @@ const drainLimit = 10 * 1024 * 1024
 // drainAndClose discards up to drainLimit bytes from r and closes
 // it. Any errors from the Read or Close are returned.
 func drainAndClose(r io.ReadCloser) (err error) {
-	_, readErr := io.CopyN(ioutil.Discard, r, drainLimit)
+	_, readErr := io.CopyN(io.Discard, r, drainLimit)
 	if readErr == io.EOF {
 		readErr = nil
 	}