+ r = -EIO;
+
+ k = fwrite(&header, 1, sizeof(header), w);
+ if (k != sizeof(header)) {
+ log_error("%s: failed to write header.", p);
+ goto error;
+ }
+
+ k = fwrite(items, 1, n * sizeof(CatalogItem), w);
+ if (k != n * sizeof(CatalogItem)) {
+ log_error("%s: failed to write database.", p);
+ goto error;
+ }
+
+ k = fwrite(sb->buf, 1, sb->len, w);
+ if (k != sb->len) {
+ log_error("%s: failed to write strings.", p);
+ goto error;
+ }
+
+ fflush(w);
+
+ if (ferror(w)) {
+ log_error("%s: failed to write database.", p);
+ goto error;
+ }
+
+ fchmod(fileno(w), 0644);
+
+ if (rename(p, database) < 0) {
+ log_error("rename (%s -> %s) failed: %m", p, database);
+ r = -errno;
+ goto error;
+ }
+
+ return ftell(w);
+
+error:
+ unlink(p);
+ return r;
+}
+
+int catalog_update(const char* database, const char* root, const char* const* dirs) {