libcmd: asyncify ProfileManifest::build

Change-Id: Ib1d7ce47c81259d305f3e993618516e4c165a084

lix/libcmd/cmd-profiles.cc

@@ -223,8 +223,8 @@ nlohmann::json ProfileManifest::toJSON(Store & store) const
     return json;
 }
 
-StorePath ProfileManifest::build(ref<Store> store)
-{
+kj::Promise<Result<StorePath>> ProfileManifest::build(ref<Store> store)
+try {
     auto tempDir = createTempDir();
 
     StorePathSet references;
@@ -269,7 +269,9 @@ StorePath ProfileManifest::build(ref<Store> store)
     StringSource source(sink.s);
     store->addToStore(info, source);
 
-    return std::move(info.path);
+    co_return std::move(info.path);
+} catch (...) {
+    co_return result::current_exception();
 }
 
 void ProfileManifest::printDiff(

lix/libcmd/cmd-profiles.hh

@@ -64,7 +64,7 @@ struct ProfileManifest
 
     nlohmann::json toJSON(Store & store) const;
 
-    StorePath build(ref<Store> store);
+    kj::Promise<Result<StorePath>> build(ref<Store> store);
 
     void addElement(std::string_view nameCandidate, ProfileElement element);
     void addElement(ProfileElement element);

lix/nix/profile.cc

@@ -110,7 +110,7 @@ struct CmdProfileInstall : InstallablesCommand, MixDefaultProfile
         }
 
         try {
-            updateProfile(manifest.build(store));
+            updateProfile(aio().blockOn(manifest.build(store)));
         } catch (BuildEnvFileConflictError & conflictError) {
             // FIXME use C++20 std::ranges once macOS has it
             //       See https://github.com/NixOS/nix/compare/3efa476c5439f8f6c1968a6ba20a31d1239c2f04..1fe5d172ece51a619e879c4b86f603d9495cc102
@@ -270,7 +270,7 @@ struct CmdProfileRemove : virtual EvalCommand, MixDefaultProfile, MixProfileElem
             }
             warn ("Use 'nix profile list' to see the current profile.");
         }
-        updateProfile(newManifest.build(store));
+        updateProfile(aio().blockOn(newManifest.build(store)));
     }
 };
 
@@ -406,7 +406,7 @@ struct CmdProfileUpgrade : virtual SourceExprCommand, MixDefaultProfile, MixProf
                 builtPaths.find(&*installable)->second.first);
         }
 
-        updateProfile(manifest.build(store));
+        updateProfile(aio().blockOn(manifest.build(store)));
     }
 };
 

lix/nix/upgrade-nix.cc

@@ -255,7 +255,7 @@ struct CmdUpgradeNix : MixDryRun, EvalCommand
         manifest.elements.at(nixElemName) = elemForNewNix;
 
         // Build the new profile, and switch to it.
-        StorePath const newProfile = manifest.build(store);
+        StorePath const newProfile = aio().blockOn(manifest.build(store));
         printTalkative("built new profile '%s'", store->printStorePath(newProfile));
         auto const newGeneration =
             aio().blockOn(createGeneration(*fsStore, this->profileDir, newProfile));