Delete history file if RQLITE_HISTFILESIZE is zero (#1146)

Delete history file if RQLITE_HISTFILESIZE is zero

Fixes https://github.com/rqlite/rqlite/issues/1145.

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 7.13.1 (unreleased)
+### Implementation changes and bug fixes
+- [PR #1146](https://github.com/rqlite/rqlite/pull/1146): Delete history file if RQLITE_HISTFILESIZE is zero. Fixes [issue #1145](https://github.com/rqlite/rqlite/issues/1145). Thanks @jamielinux
+
 ## 7.13.0 (December 15th 2022)
 ### New features
 - [PR #1141](https://github.com/rqlite/rqlite/pull/1141): Store and load CLI history across sessions.

cmd/rqlite/history/file.go

@@ -5,19 +5,16 @@ package history
 import (
 	"io"
 	"os"
-	"path/filepath"
 )
 
-const historyFile = ".rqlite_history"
-
 // Reader returns a reader of the history file.
 func Reader() io.ReadCloser {
-	hdir, err := os.UserHomeDir()
+	p, err := Path()
 	if err != nil {
 		return nil
 	}
 
-	f, err := os.Open(filepath.Join(hdir, historyFile))
+	f, err := os.Open(p)
 	if err != nil {
 		return nil
 	}
@@ -26,12 +23,12 @@ func Reader() io.ReadCloser {
 
 // Writer returns a writer for the history file.
 func Writer() io.WriteCloser {
-	hdir, err := os.UserHomeDir()
+	p, err := Path()
 	if err != nil {
 		return nil
 	}
 
-	f, err := os.OpenFile(filepath.Join(hdir, historyFile), os.O_RDWR|os.O_CREATE, 0755)
+	f, err := os.OpenFile(p, os.O_RDWR|os.O_CREATE, 0755)
 	if err != nil {
 		return nil
 	}

cmd/rqlite/history/file_test.go

@@ -0,0 +1,39 @@
+package history
+
+import (
+	"errors"
+	"io/fs"
+	"os"
+	"testing"
+)
+
+func Test_Delete(t *testing.T) {
+	w := Writer()
+	if w == nil {
+		t.Fatal("failed to create history writer")
+	}
+
+	p, err := Path()
+	if err != nil {
+		t.Fatalf("failed to get history file path: %s", err.Error())
+	}
+
+	if !exists(p) {
+		t.Fatal("history file does not exist")
+	}
+
+	w.Close()
+	if err := Delete(); err != nil {
+		t.Fatalf("failed to delete history file: %s", err.Error())
+	}
+	if exists(p) {
+		t.Fatal("history file exists after deletion")
+	}
+}
+
+func exists(path string) bool {
+	if _, err := os.Stat(path); err != nil {
+		return !errors.Is(err, fs.ErrNotExist)
+	}
+	return true
+}

cmd/rqlite/history/file_windows.go

@@ -3,12 +3,9 @@ package history
 import (
 	"io"
 	"os"
-	"path/filepath"
 	"syscall"
 )
 
-const historyFile = "rqlite_history"
-
 func setHidden(path string) error {
 	filenameW, err := syscall.UTF16PtrFromString(path)
 	if err != nil {
@@ -25,12 +22,12 @@ func setHidden(path string) error {
 
 // Reader returns a reader of the history file.
 func Reader() io.ReadCloser {
-	hdir, err := os.UserHomeDir()
+	p, err := Path()
 	if err != nil {
 		return nil
 	}
 
-	f, err := os.Open(filepath.Join(hdir, historyFile))
+	f, err := os.Open(p)
 	if err != nil {
 		return nil
 	}
@@ -39,16 +36,15 @@ func Reader() io.ReadCloser {
 
 // Writer returns a writer for the history file.
 func Writer() io.WriteCloser {
-	hdir, err := os.UserHomeDir()
+	p, err := Path()
 	if err != nil {
 		return nil
 	}
 
-	path := filepath.Join(hdir, historyFile)
-	f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0755)
+	f, err := os.OpenFile(p, os.O_RDWR|os.O_CREATE, 0755)
 	if err != nil {
 		return nil
 	}
-	setHidden(path) // best effort
+	setHidden(p) // best effort
 	return f
 }

cmd/rqlite/history/paths.go

@@ -0,0 +1,26 @@
+package history
+
+import (
+	"os"
+	"path/filepath"
+)
+
+const historyFile = ".rqlite_history"
+
+// Path returns the full path to the history file.
+func Path() (string, error) {
+	hdir, err := os.UserHomeDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(hdir, historyFile), nil
+}
+
+// Delete deletes the history file.
+func Delete() error {
+	p, err := Path()
+	if err != nil {
+		return err
+	}
+	return os.Remove(p)
+}

cmd/rqlite/main.go

@@ -208,9 +208,11 @@ func main() {
 		}
 
 		hw := history.Writer()
-		if hw != nil {
-			history.Write(term.History, history.Size(), hw)
-			hw.Close()
+		sz := history.Size()
+		history.Write(term.History, sz, hw)
+		hw.Close()
+		if sz <= 0 {
+			history.Delete()
 		}
 		ctx.String("bye~\n")
 		return nil