ci: mount audit workspace safely

tools/checks/security-audit/run.sh

@@ -139,13 +139,53 @@ if [[ "$BUILD_ONLY" == "1" ]]; then
   exit 0
 fi
 
-if [[ "$SCOPE" == "govoplan" ]]; then
+declare -a WORKSPACE_MOUNT=()
+if [[ "${GITEA_ACTIONS:-}" == "true" ]]; then
+  ACTIONS_CONTAINER_ID="$(hostname)"
+  if ! ACTIONS_MOUNTS_JSON="$(
+    "${DOCKER_CLI[@]}" container inspect \
+      --format '{{json .Mounts}}' \
+      "$ACTIONS_CONTAINER_ID"
+  )"; then
+    echo "Gitea Actions is using a host Docker daemon, but the current job container could not be resolved." >&2
+    echo "Cannot safely share the checked-out workspace with the audit container." >&2
+    exit 1
+  fi
+  if command -v python3 >/dev/null 2>&1; then
+    MOUNT_PYTHON=python3
+  elif command -v python >/dev/null 2>&1; then
+    MOUNT_PYTHON=python
+  else
+    echo "Python is required to validate the Gitea Actions workspace mount." >&2
+    exit 1
+  fi
+  if ! ACTIONS_WORKSPACE_MOUNT="$(
+    printf '%s' "$ACTIONS_MOUNTS_JSON" \
+      | "$MOUNT_PYTHON" "$ROOT/tools/checks/security-audit/resolve_workspace_mount.py" \
+        --root "$ROOT" \
+        --scope "$SCOPE" \
+        --reports-dir "$REPORTS_DIR"
+  )"; then
+    echo "Cannot safely share the Gitea Actions workspace with the audit container." >&2
+    exit 1
+  fi
+  WORKSPACE_MOUNT=(--mount "$ACTIONS_WORKSPACE_MOUNT")
+  MOUNT_ROOT="$(dirname "$ROOT")"
+  WORKDIR="$ROOT"
+  if [[ "$SCOPE" == "govoplan" ]]; then
+    EXTRA_ENV=(-e "GOVOPLAN_REPOS_ROOT=$MOUNT_ROOT")
+  else
+    EXTRA_ENV=()
+  fi
+elif [[ "$SCOPE" == "govoplan" ]]; then
   MOUNT_ROOT="$(dirname "$ROOT")"
   WORKDIR="/workspace/$(basename "$ROOT")"
+  WORKSPACE_MOUNT=(-v "$MOUNT_ROOT:/workspace")
   EXTRA_ENV=(-e "GOVOPLAN_REPOS_ROOT=/workspace")
 else
   MOUNT_ROOT="$ROOT"
   WORKDIR="/workspace"
+  WORKSPACE_MOUNT=(-v "$MOUNT_ROOT:/workspace")
   EXTRA_ENV=()
 fi
 
@@ -159,7 +199,7 @@ fi
   -e SECURITY_AUDIT_REQUIRE_TOOLS="${SECURITY_AUDIT_REQUIRE_TOOLS:-0}" \
   -e SECURITY_AUDIT_TOOLBOX_FINGERPRINT="$IMAGE_FINGERPRINT" \
   "${EXTRA_ENV[@]}" \
-  -v "$MOUNT_ROOT:/workspace" \
+  "${WORKSPACE_MOUNT[@]}" \
   -w "$WORKDIR" \
   "$FINGERPRINT_IMAGE" \
   bash tools/checks/check-security-audit.sh --mode "$MODE" --scope "$SCOPE" --reports-dir "$REPORTS_DIR" "${SCRIPT_ARGS[@]}"