gout

commit ae9f630c1303dfcf78e4a95185ecca52e7fb204a
parent ed304b815e7741c7cf2bc2b4cd3b79540f47d8a7
Author: Chris Bracken <chris@bracken.jp>
Date:   Thu, 19 Feb 2026 13:36:22 +0900

cache: if cache file is empty/corrupt do a full build

If the cache file exists but is empty or corrupt, we continue processing
with a full build as though there hadn't been a cache file at all. The
cache file is simply an optimisation so this isn't the end of the world.

Diffstat:
M
src/writer/cache/cache.c
 | 
13
++++++++++---

1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/src/writer/cache/cache.c b/src/writer/cache/cache.c
@@ -39,10 +39,17 @@ Cache* cache_create(const char* cache_path, WriteCommitRow write_func) {
     // OID + '\n' + '\0'.
     char buf[kOidLen + 1];
     char* oid_str = fgets(buf, sizeof(buf), cache->cache_in);
-    if (!oid_str) {
-      err(1, "fgets");
+    if (oid_str) {
+      // Copy oid_str and trim trailing newline if it exists.
+      estrlcpy(cache->lastoid_in, oid_str, kOidLen);
+      size_t len = strlen(cache->lastoid_in);
+      while (len > 0 && (cache->lastoid_in[len - 1] == '\n' ||
+                         cache->lastoid_in[len - 1] == '\r')) {
+        cache->lastoid_in[--len] = '\0';
+      }
+    } else {
+      warnx("corrupt cachefile: %s", cache_path);
     }
-    estrlcpy(cache->lastoid_in, oid_str, sizeof(buf));
   }
   cache->wrote_lastoid_out = false;