From 0c235305513ada57cd01b2cfbc78e646e0263c47 Mon Sep 17 00:00:00 2001
From: Joost Jager <joost.jager@gmail.com>
Date: Wed, 29 Apr 2026 15:07:29 +0200
Subject: [PATCH] Add chanmon fuzz corpus priming workflow

Add a manual workflow that primes the persistent chanmon
consistency honggfuzz corpus with comma-separated hex seeds.

This lets failing or challenging inputs from offline fuzzing be kept
in the rolling corpus so future CI continues exercising them.
Regular minimization drops duplicates and inputs that no longer
add value.
---
 .../prime-chanmon-consistency-fuzz-corpus.yml | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 .github/workflows/prime-chanmon-consistency-fuzz-corpus.yml

diff --git a/.github/workflows/prime-chanmon-consistency-fuzz-corpus.yml b/.github/workflows/prime-chanmon-consistency-fuzz-corpus.yml
new file mode 100644
index 00000000000..d0c6f0c88da
--- /dev/null
+++ b/.github/workflows/prime-chanmon-consistency-fuzz-corpus.yml
@@ -0,0 +1,70 @@
+name: Prime chanmon consistency fuzz corpus
+
+on:
+  workflow_dispatch:
+    inputs:
+      seeds_hex:
+        description: "Comma-separated hex byte strings (e.g. 00,0102,deadbeef)"
+        type: string
+        required: true
+
+permissions:
+  actions: write
+  contents: read
+
+jobs:
+  prime-chanmon-consistency:
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Restore latest main corpus
+        uses: actions/cache/restore@v4
+        with:
+          path: fuzz/hfuzz_workspace
+          key: fuzz-corpus-refs/heads/main-prime-${{ github.run_id }}
+          restore-keys: |
+            fuzz-corpus-refs/heads/main-
+
+      - name: Decode and layer seeds
+        env:
+          SEEDS_HEX: ${{ inputs.seeds_hex }}
+        run: |
+          set -euo pipefail
+          TARGET="chanmon_consistency_target"
+          INPUT_DIR="fuzz/hfuzz_workspace/${TARGET}/input"
+          if [ -d "$INPUT_DIR" ]; then
+            RESTORED_COUNT=$(find "$INPUT_DIR" -type f | wc -l)
+          else
+            RESTORED_COUNT=0
+          fi
+          mkdir -p "$INPUT_DIR"
+          echo "Restored $RESTORED_COUNT seed(s)"
+          FIELD_COUNT=0
+          SEED_COUNT=0
+          SEEDS_HEX_CLEAN="${SEEDS_HEX//$'\n'/,}"
+          IFS=',' read -r -a SEED_HEXES <<< "$SEEDS_HEX_CLEAN"
+          for SEED_HEX in "${SEED_HEXES[@]}"; do
+            FIELD_COUNT=$((FIELD_COUNT + 1))
+            SEED_HEX="${SEED_HEX%$'\r'}"
+            SEED_HEX="${SEED_HEX//[[:space:]]/}"
+            [ -n "$SEED_HEX" ] || continue
+            if ! [[ "$SEED_HEX" =~ ^([[:xdigit:]]{2})+$ ]]; then
+              echo "Invalid hex seed in input field $FIELD_COUNT"
+              exit 1
+            fi
+            SEED_COUNT=$((SEED_COUNT + 1))
+            SEED_FILE="$(printf '%s/primed-%s-%04d' "$INPUT_DIR" "$GITHUB_RUN_ID" "$SEED_COUNT")"
+            printf '%s' "$SEED_HEX" | xxd -r -p > "$SEED_FILE"
+            test -s "$SEED_FILE"
+            echo "Wrote seed: $SEED_FILE ($SEED_HEX)"
+          done
+          test "$SEED_COUNT" -gt 0
+          SAVE_COUNT=$(find "$INPUT_DIR" -type f | wc -l)
+          echo "Added $SEED_COUNT seed(s)"
+          echo "Saving $SAVE_COUNT seed(s)"
+
+      - name: Save primed corpus
+        uses: actions/cache/save@v4
+        with:
+          path: fuzz/hfuzz_workspace
+          key: fuzz-corpus-refs/heads/main-prime-${{ github.run_id }}