refactor(tvix): Make Store::buildPaths return a Status r/1649

Make Store::buildPaths return a Status with [[nodiscard]] rather than
throwing exceptions to signal failure. This is the beginning of a long
road to refactor the entire store API to be status/statusor based
instead of using exceptions.

Change-Id: I2e32371c95a25b87ad129987c217d49c6d6e0c85
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1745
Tested-by: BuildkiteCI
Reviewed-by: kanepyork <rikingcoding@gmail.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/third_party/nix/src/libutil/status.hh b/third_party/nix/src/libutil/status.hh
new file mode 100644
index 000000000000..aeee0f502257
--- /dev/null
+++ b/third_party/nix/src/libutil/status.hh
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <absl/status/status.h>
+#include <absl/strings/str_format.h>
+#include <absl/strings/string_view.h>
+
+#include "libutil/types.hh"
+
+namespace nix::util {
+
+inline void OkOrThrow(absl::Status status) {
+  if (!status.ok()) {
+    throw Error(absl::StrFormat("Operation failed: %s", status.ToString()));
+  }
+}
+
+}  // namespace nix::util