refactor(tvix): Remove some default values from virtual methods r/1687

This is not actually legal code, but it kind of ... works. There are
more of these around, these were just the ones Griffin stumbled upon
while working on the build logs.

Change-Id: Iff9821d8fe145dd426648a8ff4510a73f67c9b7d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1795
Tested-by: BuildkiteCI
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Reviewed-by: glittershark <grfn@gws.fyi>

1 files changed, 16 insertions, 4 deletions

diff --git a/third_party/nix/src/libstore/store-api.hh b/third_party/nix/src/libstore/store-api.hh
index 1d81b228f2..bb2f1a950b 100644
--- a/third_party/nix/src/libstore/store-api.hh
+++ b/third_party/nix/src/libstore/store-api.hh
@@ -348,8 +348,12 @@ class Store : public std::enable_shared_from_this<Store>, public Config {
  public:
   /* Query which of the given paths is valid. Optionally, try to
      substitute missing paths. */
-  virtual PathSet queryValidPaths(
-      const PathSet& paths, SubstituteFlag maybeSubstitute = NoSubstitute);
+  virtual PathSet queryValidPaths(const PathSet& paths,
+                                  SubstituteFlag maybeSubstitute);
+
+  PathSet queryValidPaths(const PathSet& paths) {
+    return queryValidPaths(paths, NoSubstitute);
+  }
 
   /* Query the set of all valid paths. Note that for some store
      backends, the name part of store paths may be omitted
@@ -452,14 +456,22 @@ class Store : public std::enable_shared_from_this<Store>, public Config {
      recursively building any sub-derivations. For inputs that are
      not derivations, substitute them. */
   [[nodiscard]] virtual absl::Status buildPaths(const PathSet& paths,
-                                                BuildMode buildMode = bmNormal);
+                                                BuildMode buildMode);
+
+  [[nodiscard]] absl::Status buildPaths(const PathSet& paths) {
+    return buildPaths(paths, bmNormal);
+  }
 
   /* Build a single non-materialized derivation (i.e. not from an
      on-disk .drv file). Note that ‘drvPath’ is only used for
      informational purposes. */
   virtual BuildResult buildDerivation(const Path& drvPath,
                                       const BasicDerivation& drv,
-                                      BuildMode buildMode = bmNormal) = 0;
+                                      BuildMode buildMode) = 0;
+
+  BuildResult buildDerivation(const Path& drvPath, const BasicDerivation& drv) {
+    return buildDerivation(drvPath, drv, bmNormal);
+  }
 
   /* Ensure that a path is valid.  If it is not currently valid, it
      may be made valid by running a substitute (if defined for the