refactor: migrate fuzzing container to ContFuzzer v2 interface

.github/workflows/fuzzing-docker-avm-build-private.yml

@@ -51,9 +51,9 @@ jobs:
           secrets: |
             github_token=${{ secrets.GITHUB_TOKEN }}
           labels: |
-            com.aztec.source-repo=${{ github.repository }}
-            com.aztec.source-branch=${{ github.ref_name }}
-            com.aztec.commit=${{ github.sha }}
+            org.opencontainers.image.source=https://github.com/${{ github.repository }}
+            org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.revision.branch=${{ github.ref_name }}
             com.aztec.visibility=private
 
       - name: Install cosign

.github/workflows/fuzzing-docker-avm-build.yml

@@ -45,9 +45,9 @@ jobs:
           build-args: |
             COMMIT=${{ github.event_name == 'workflow_dispatch' && github.event.inputs.commit || github.sha }}
           labels: |
-            com.aztec.source-repo=${{ github.repository }}
-            com.aztec.source-branch=${{ github.ref_name }}
-            com.aztec.commit=${{ github.sha }}
+            org.opencontainers.image.source=https://github.com/${{ github.repository }}
+            org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.revision.branch=${{ github.ref_name }}
             com.aztec.visibility=public
 
       - name: Install cosign

.github/workflows/fuzzing-docker-build-private.yml

@@ -51,9 +51,9 @@ jobs:
           secrets: |
             github_token=${{ secrets.GITHUB_TOKEN }}
           labels: |
-            com.aztec.source-repo=${{ github.repository }}
-            com.aztec.source-branch=${{ github.ref_name }}
-            com.aztec.commit=${{ github.sha }}
+            org.opencontainers.image.source=https://github.com/${{ github.repository }}
+            org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.revision.branch=${{ github.ref_name }}
             com.aztec.visibility=private
 
       - name: Install oras
@@ -65,7 +65,7 @@ jobs:
           docker cp manifest-extract:/home/fuzzer/aztec-packages/barretenberg/cpp/fuzzer_manifest.json ./fuzzer_manifest.json
           docker rm manifest-extract
           oras attach ghcr.io/aztecprotocol/fuzzing-container-private@${{ steps.build.outputs.digest }} \
-            --artifact-type application/vnd.aztec.fuzzer-manifest+json \
+            --artifact-type application/vnd.contfuzzer.manifest+json \
             fuzzer_manifest.json
 
       - name: Install cosign

.github/workflows/fuzzing-docker-build.yml

@@ -45,9 +45,9 @@ jobs:
           build-args: |
             COMMIT=${{ github.event_name == 'workflow_dispatch' && github.event.inputs.commit || github.sha }}
           labels: |
-            com.aztec.source-repo=${{ github.repository }}
-            com.aztec.source-branch=${{ github.ref_name }}
-            com.aztec.commit=${{ github.sha }}
+            org.opencontainers.image.source=https://github.com/${{ github.repository }}
+            org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.revision.branch=${{ github.ref_name }}
             com.aztec.visibility=public
 
       - name: Install oras
@@ -59,7 +59,7 @@ jobs:
           docker cp manifest-extract:/home/fuzzer/aztec-packages/barretenberg/cpp/fuzzer_manifest.json ./fuzzer_manifest.json
           docker rm manifest-extract
           oras attach ghcr.io/aztecprotocol/fuzzing-container@${{ steps.build.outputs.digest }} \
-            --artifact-type application/vnd.aztec.fuzzer-manifest+json \
+            --artifact-type application/vnd.contfuzzer.manifest+json \
             fuzzer_manifest.json
 
       - name: Install cosign

barretenberg/cpp/scripts/flatten_and_manifest.py

@@ -0,0 +1,141 @@
+#!/usr/bin/env python3
+"""Flatten variant binaries into /targets/ and generate a unified v2 manifest.
+
+Reads per-preset manifests (produced by generate_fuzzer_manifest.py via CMake)
+to discover binaries, suffixes, and source paths. No variant knowledge is
+hardcoded here — it all comes from the manifests.
+
+Usage (from barretenberg/cpp/ during Docker build):
+    python3 scripts/flatten_and_manifest.py /targets /tmp/fuzzer_manifest.json \
+        bin-fuzzing/fuzzer_manifest.json \
+        bin-fuzzing-noasm/fuzzer_manifest.json \
+        bin-fuzzing-avm/fuzzer_manifest.json \
+        --copy-only bin-fuzzing-asan/fuzzer_manifest.json \
+        --copy-only build-fuzzing-cov/bin/fuzzer_manifest.json
+
+Positional manifests: binaries are copied AND added to the unified manifest.
+--copy-only manifests: binaries are copied but NOT added (companion builds
+like asan/coverage that the entrypoint discovers by suffix convention).
+"""
+
+import argparse
+import json
+import os
+import shutil
+import sys
+
+
+def _load_manifest(path: str) -> dict:
+    with open(path) as f:
+        return json.load(f)
+
+
+def _copy_executables(bin_dir: str, dest_dir: str, suffix: str) -> list[str]:
+    """Copy executable files from bin_dir to dest_dir/<name><suffix>. Returns names."""
+    copied = []
+    if not os.path.isdir(bin_dir):
+        print(f"Warning: {bin_dir} not found, skipping", file=sys.stderr)
+        return copied
+    for name in sorted(os.listdir(bin_dir)):
+        src = os.path.join(bin_dir, name)
+        if os.path.isfile(src) and os.access(src, os.X_OK):
+            shutil.copy2(src, os.path.join(dest_dir, f"{name}{suffix}"))
+            copied.append(name)
+    return copied
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Flatten binaries and generate v2 manifest")
+    parser.add_argument("targets_dir", help="Destination for flattened binaries")
+    parser.add_argument("manifest_out", help="Output path for unified v2 manifest")
+    parser.add_argument("manifests", nargs="*", help="Per-preset manifests (schedulable)")
+    parser.add_argument("--copy-only", action="append", default=[], dest="companions",
+                        help="Per-preset manifests for companion builds (copy only, not scheduled)")
+    parser.add_argument("--cpus", type=int, default=4, help="Default CPUs per target")
+    parser.add_argument("--memory-gb", type=int, default=8, help="Default memory GB per target")
+    args = parser.parse_args()
+
+    os.makedirs(args.targets_dir, exist_ok=True)
+
+    # Collect coverage fuzzer names (from whichever manifest has preset fuzzing-coverage)
+    cov_names: set[str] = set()
+    for path in args.manifests + args.companions:
+        data = _load_manifest(path)
+        if data.get("preset") == "fuzzing-coverage":
+            cov_names = {fz["name"] for fz in data.get("fuzzers", [])}
+
+    targets = []
+    total_copied = 0
+
+    # The fuzzing-avm preset enables FUZZING_AVM in cmake, which adds the
+    # AVM-specific fuzzers (avm_fuzzer_*, harness_*).  However cmake also
+    # rebuilds every base fuzzer target (stdlib_*, ecc_*, translator_*, etc.)
+    # as a side effect.  Those collateral rebuilds are identical in behaviour
+    # to the base preset and should NOT be scheduled as separate jobs.
+    #
+    # We collect fuzzer names from the first (base) manifest, then for the
+    # AVM preset we only schedule names that are new (the actual AVM fuzzers).
+    # All binaries are still copied to /targets/ — the entrypoint may need them.
+    #
+    # TODO: if cmake learns to build only AVM-specific targets in the
+    # fuzzing-avm preset, this filter can be removed.
+    base_names: set[str] = set()
+
+    for i, path in enumerate(args.manifests):
+        data = _load_manifest(path)
+        suffix = data.get("suffix", "")
+        preset = data.get("preset", "")
+        label = preset.removeprefix("fuzzing-") or "asm"
+        bin_dir = os.path.dirname(path)
+
+        copied = _copy_executables(bin_dir, args.targets_dir, suffix)
+        total_copied += len(copied)
+
+        fuzzers_meta = {fz["name"]: fz["source_path"] for fz in data.get("fuzzers", [])}
+
+        if i == 0:
+            base_names = set(copied)
+
+        # See docstring above — only the AVM preset needs dedup.
+        dedup = preset == "fuzzing-avm" and bool(base_names)
+
+        scheduled = 0
+        for name in copied:
+            if dedup and name in base_names:
+                continue
+            scheduled += 1
+            source_path = fuzzers_meta.get(name, "")
+            modes = ["fuzz", "minimize", "reproduce", "regress"]
+            if name in cov_names:
+                modes.append("coverage")
+            targets.append({
+                "name": f"{name}{suffix}",
+                "display_name": f"{name} ({label})",
+                "language": "c++",
+                "fuzzer_engine": "libfuzzer",
+                "source_path": f"barretenberg/cpp/src/barretenberg/{source_path}" if source_path else "",
+                "modes": modes,
+                "resources": {"cpus": args.cpus, "memory_gb": args.memory_gb},
+            })
+        if scheduled < len(copied):
+            print(f"  {preset}: {scheduled} scheduled, {len(copied) - scheduled} skipped (in base preset)")
+
+    # Process companion presets: copy binaries only
+    for path in args.companions:
+        data = _load_manifest(path)
+        suffix = data.get("suffix", "")
+        bin_dir = os.path.dirname(path)
+        copied = _copy_executables(bin_dir, args.targets_dir, suffix)
+        total_copied += len(copied)
+
+    manifest = {"schema": "2", "targets": targets}
+    os.makedirs(os.path.dirname(args.manifest_out) or ".", exist_ok=True)
+    with open(args.manifest_out, "w") as f:
+        json.dump(manifest, f, indent=2)
+
+    print(f"Copied {total_copied} binaries to {args.targets_dir}, "
+          f"wrote {len(targets)} targets to {args.manifest_out}")
+
+
+if __name__ == "__main__":
+    main()

barretenberg/cpp/scripts/generate_fuzzer_manifest.py

@@ -21,9 +21,15 @@ def main():
                 name, source_path = line.split("|", 1)
                 fuzzers.append({"name": name, "source_path": source_path})
 
+    # Derive binary suffix from preset name (e.g. fuzzing-noasm -> _noasm)
+    suffix = ""
+    if preset and preset != "fuzzing":
+        tag = preset.removeprefix("fuzzing-").replace("coverage", "cov")
+        suffix = f"_{tag}"
+
     os.makedirs(os.path.dirname(output_file), exist_ok=True)
     with open(output_file, "w") as f:
-        json.dump({"version": 1, "preset": preset, "fuzzers": fuzzers}, f, indent=2)
+        json.dump({"version": 1, "preset": preset, "suffix": suffix, "fuzzers": fuzzers}, f, indent=2)
 
     print(f"Wrote {len(fuzzers)} fuzzers to {output_file} (preset: {preset})")