pkg/stack: move to daemon/internal

This package is used by the daemon to produce a stack-dump, It has no
external consumers, so we can move it to daemon/internal.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

pkg/stack/stackdump.go

@@ -1,59 +0,0 @@
-package stack
-
-import (
-	"fmt"
-	"os"
-	"path/filepath"
-	"runtime"
-	"strings"
-	"time"
-
-	"github.com/pkg/errors"
-)
-
-const stacksLogNameTemplate = "goroutine-stacks-%s.log"
-
-// Dump outputs the runtime stack to os.StdErr.
-func Dump() {
-	_ = dump(os.Stderr)
-}
-
-// DumpToFile appends the runtime stack into a file named "goroutine-stacks-<timestamp>.log"
-// in dir and returns the full path to that file. If no directory name is
-// provided, it outputs to os.Stderr.
-func DumpToFile(dir string) (string, error) {
-	var f *os.File
-	if dir != "" {
-		path := filepath.Join(dir, fmt.Sprintf(stacksLogNameTemplate, strings.ReplaceAll(time.Now().Format(time.RFC3339), ":", "")))
-		var err error
-		f, err = os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0o666)
-		if err != nil {
-			return "", errors.Wrap(err, "failed to open file to write the goroutine stacks")
-		}
-		defer func() {
-			_ = f.Sync()
-			_ = f.Close()
-		}()
-	} else {
-		f = os.Stderr
-	}
-	return f.Name(), dump(f)
-}
-
-func dump(f *os.File) error {
-	var (
-		buf       []byte
-		stackSize int
-	)
-	bufferLen := 16384
-	for stackSize == len(buf) {
-		buf = make([]byte, bufferLen)
-		stackSize = runtime.Stack(buf, true)
-		bufferLen *= 2
-	}
-	buf = buf[:stackSize]
-	if _, err := f.Write(buf); err != nil {
-		return errors.Wrap(err, "failed to write goroutine stacks")
-	}
-	return nil
-}

pkg/stack/stackdump_test.go

@@ -1,28 +0,0 @@
-package stack
-
-import (
-	"os"
-	"testing"
-
-	"gotest.tools/v3/assert"
-	is "gotest.tools/v3/assert/cmp"
-)
-
-func TestDump(t *testing.T) {
-	Dump()
-}
-
-func TestDumpToFile(t *testing.T) {
-	tmpDir := t.TempDir()
-	dumpPath, err := DumpToFile(tmpDir)
-	assert.Check(t, err)
-	readFile, _ := os.ReadFile(dumpPath)
-	fileData := string(readFile)
-	assert.Check(t, is.Contains(fileData, "goroutine"))
-}
-
-func TestDumpToFileWithEmptyInput(t *testing.T) {
-	path, err := DumpToFile("")
-	assert.Check(t, err)
-	assert.Check(t, is.Equal(os.Stderr.Name(), path))
-}