Fix macOS clone collision from Unicode-normalization duplicate filenames

content/events/2025/pqc-conference-austin-us/index.md

@@ -813,7 +813,7 @@ data:
             speakers:
               - Alexander Löw
             youtube: dBsymlmASsw
-            presentation: THU_PLENARY_1230_Alexander-Löw_Practical-Insights-from-Following-NIST-SP-1800-38B.pdf
+            presentation: THU_PLENARY_1230_Alexander-Loew_Practical-Insights-from-Following-NIST-SP-1800-38B.pdf
             locations:
               - plenary
 
@@ -895,7 +895,7 @@ data:
             speakers:
               - Jaime Gómez García
             youtube: HywJXpEOvFQ
-            presentation: THU_PLENARY_1500_Jaime-Gómez-García_Perspectives-on-the-transition-to-PQC-in-the-financial-sector.pdf
+            presentation: THU_PLENARY_1500_Jaime-Gomez-Garcia_Perspectives-on-the-transition-to-PQC-in-the-financial-sector.pdf
             locations:
               - plenary
 

package.json

@@ -23,11 +23,12 @@
     "test:e2e": "playwright test",
     "test:watch": "vitest",
     "check:max-lines": "node scripts/check-max-lines.mjs",
+    "check:filenames": "node scripts/check-filename-collisions.mjs",
     "lint": "eslint functions/ assets/ts/ assets/shared/ tests/",
     "lint:fix": "eslint --fix functions/ assets/ts/ assets/shared/ tests/",
     "format": "prettier --write \"functions/**/*.ts\" \"assets/ts/**/*.{ts,tsx}\" \"assets/shared/**/*.ts\" \"tests/**/*.ts\"",
     "format:check": "prettier --check \"functions/**/*.ts\" \"assets/ts/**/*.{ts,tsx}\" \"assets/shared/**/*.ts\" \"tests/**/*.ts\"",
-    "check": "npm run typecheck && npm run lint && npm run format:check && npm run test && npm run check:max-lines",
+    "check": "npm run typecheck && npm run lint && npm run format:check && npm run test && npm run check:max-lines && npm run check:filenames",
     "migrate:local": "npx wrangler d1 migrations apply DB --env local --local",
     "migrate:preview": "npx wrangler d1 migrations apply DB --env preview --remote",
     "migrate:production": "npx wrangler d1 migrations apply DB --env production --remote",

scripts/check-filename-collisions.mjs

@@ -0,0 +1,35 @@
+import { execFileSync } from "node:child_process";
+
+// Case-insensitive/normalization-insensitive filesystems (macOS APFS/HFS+,
+// Windows) collapse paths that git treats as distinct, e.g. "Löw" written
+// with a precomposed ö (NFC) vs. "o" + combining diaeresis (NFD), or two
+// names differing only by case. Git happily tracks both; checkout on those
+// filesystems silently drops one. Catch that here instead of at clone time.
+const output = execFileSync("git", ["ls-files", "-z"], { encoding: "utf8" });
+const files = output.split("\0").filter(Boolean);
+
+const seen = new Map();
+for (const file of files) {
+  const key = file.normalize("NFC").toLowerCase();
+  const group = seen.get(key);
+  if (group) {
+    group.push(file);
+  } else {
+    seen.set(key, [file]);
+  }
+}
+
+const collisions = [...seen.values()].filter((group) => group.length > 1);
+
+if (collisions.length > 0) {
+  console.error(`Found ${collisions.length} filename collision group(s) that will break on case-insensitive filesystems (e.g. macOS):`);
+  for (const group of collisions) {
+    console.error("-");
+    for (const file of group) {
+      console.error(`    ${file}`);
+    }
+  }
+  process.exit(1);
+}
+
+console.log(`No case/normalization filename collisions found across ${files.length} tracked files.`);