From a62e42b9be8402301631c9043f640eb7f43eff29 Mon Sep 17 00:00:00 2001
From: Bernhard Guillon <Bernhard.Guillon@begu.org>
Date: Tue, 7 Jul 2026 23:17:20 +0200
Subject: Add FNV-1a content hash to detect same-size changes

---
 cmd_linux.go | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'cmd_linux.go')

diff --git a/cmd_linux.go b/cmd_linux.go
index 305b7d1..70ee2fb 100644
--- a/cmd_linux.go
+++ b/cmd_linux.go
@@ -194,13 +194,15 @@ func syncFromManifest(remote *Manifest, stack *GitignoreStack) {
 
 		if localMeta, exists := localManifest.Files[relPath]; exists {
 			if localMeta.Size == remoteMeta.Size &&
-				localMeta.Symlink == remoteMeta.Symlink {
+				localMeta.Symlink == remoteMeta.Symlink &&
+				(remoteMeta.Hash == 0 || localMeta.Hash == remoteMeta.Hash) {
 				continue
 			}
 			if debugShown < 5 {
-				logDebug("mismatch %s: size=%d/%d symlink=%q/%q",
+				logDebug("mismatch %s: size=%d/%d hash=%d/%d symlink=%q/%q",
 					relPath,
 					localMeta.Size, remoteMeta.Size,
+					localMeta.Hash, remoteMeta.Hash,
 					localMeta.Symlink, remoteMeta.Symlink)
 				debugShown++
 			}
@@ -310,11 +312,17 @@ func scanLocalDirectory(root string) *Manifest {
 			linkTarget, _ = os.Readlink(path)
 		}
 
+		var hash uint64
+		if !info.IsDir() && linkTarget == "" {
+			hash = hashFile(path)
+		}
+
 		manifest.Files[relPath] = FileMeta{
 			Size:    info.Size(),
 			Mode:    info.Mode(),
 			ModTime: info.ModTime(),
 			Symlink: linkTarget,
+			Hash:    hash,
 		}
 
 		return nil
-- 
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