Append logs instead of overwriting

CHANGELOG.md

@@ -43,6 +43,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 - The experimental `locale` option has been removed in favor of the recommendation to use `addcustominfo`/`set sortby custom` for custom sorting (#2111).
 - The existing `doc` command has been renamed to `help` so that it is more natural for users (#2125).
 - Text previews are no longer displayed with a padding of two spaces by default (#2131). Instead, a custom padding can be added in the `previewer` script, for example by piping to `sed 's/^/  /'`.
+- Logs generated by `-log <path>` now get appended to `<path>` instead of overwriting it (#2215).
 
 ### Added
 

client.go

@@ -27,7 +27,7 @@ func init() {
 
 func run() {
 	if gLogPath != "" {
-		f, err := os.OpenFile(gLogPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o600)
+		f, err := os.OpenFile(gLogPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0o600)
 		if err != nil {
 			log.Fatalf("failed to open log file: %s", err)
 		}

server.go

@@ -17,7 +17,7 @@ var (
 
 func serve() {
 	if gLogPath != "" {
-		f, err := os.OpenFile(gLogPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o600)
+		f, err := os.OpenFile(gLogPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0o600)
 		if err != nil {
 			log.Fatalf("failed to open log file: %s", err)
 		}