Add log level system and sync logging

- log.go: log level system (DEBUG, INFO, WARN, ERROR, NONE)
- CLI: -log-level flag (default info), -verbose as shorthand for debug
- Watcher: logs sync/remove actions at INFO level
- Watcher: logs events at DEBUG level
- Errors: structured error messages (DISK FULL, PERMISSION DENIED, etc.)
- Updated README with -log-level flag

1 files changed, 5 insertions, 6 deletions

diff --git a/errors.go b/errors.go
index 282a08b..2cc0b4b 100644
--- a/errors.go
+++ b/errors.go
@@ -3,7 +3,6 @@ package main
 import (
 	"errors"
 	"io/fs"
-	"log"
 	"os"
 	"syscall"
 	"time"
@@ -51,7 +50,7 @@ func isRetryable(err error) bool {
 	return false
 }
 
-func logError(op, relPath string, err error) {
+func logSyncError(op, relPath string, err error) {
 	if err == nil {
 		return
 	}
@@ -65,13 +64,13 @@ func logError(op, relPath string, err error) {
 
 	switch {
 	case errors.Is(err, syscall.ENOSPC):
-		log.Printf("DISK FULL: %s %s failed - no space left on device", op, relPath)
+		logErrorf("DISK FULL: %s %s failed - no space left on device", op, relPath)
 	case errors.Is(err, syscall.EACCES), errors.Is(err, syscall.EPERM):
-		log.Printf("PERMISSION DENIED: %s %s - check volume mount permissions", op, relPath)
+		logErrorf("PERMISSION DENIED: %s %s - check volume mount permissions", op, relPath)
 	case errors.Is(err, syscall.ELOOP):
-		log.Printf("SYMLINK LOOP: %s %s - too many symbolic links", op, relPath)
+		logErrorf("SYMLINK LOOP: %s %s - too many symbolic links", op, relPath)
 	default:
-		log.Printf("ERROR: %s %s: %v", op, relPath, err)
+		logErrorf("%s %s: %v", op, relPath, err)
 	}
 }