From 21339a73f5cd592ebd92937a1440aa9f13e75bbb Mon Sep 17 00:00:00 2001
From: Lukasz Kasprzak <lukas@labunix.xyz>
Date: Mon, 14 Sep 2026 22:26:23 +0200
Subject: plan 10: a damaged log line refuses only its file, not the run

---
 internal/engine/apply.go | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'internal/engine/apply.go')

diff --git a/internal/engine/apply.go b/internal/engine/apply.go
index cc87f30..ed2fbe5 100644
--- a/internal/engine/apply.go
+++ b/internal/engine/apply.go
@@ -496,6 +496,14 @@ func isFileAffecting(action string) bool {
 // overrides a real occupant that this same chain is itself about to clear.
 func planUndoFile(dir, file string, ents []journal.Entry, reversed map[journal.ReversedKey]int) UndoFile {
 	uf := UndoFile{File: file, Dir: dir}
+	for _, en := range ents {
+		if en.Action == "damaged" {
+			// A log line of this file is cut or damaged (journal.Entries): a
+			// step may be missing from its chain, so none of it is reversed.
+			uf.Refused = fmt.Sprintf("its log is damaged (%s); a step may not be recorded", en.Detail)
+			return uf
+		}
+	}
 	proj := newUndoProjection()
 	for i := len(ents) - 1; i >= 0; i-- {
 		en := ents[i]
-- 
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