serve source tree: Increase server-side granularity in response statuses

For archives and Git repositories we should ensure that not finding
the witnessing entity (archive content blob or Git commit,
respectively) results in a distinct status in the response to a
request that sets up roots on the serve endpoint. This will allow
just-mr to better handle its interaction with the serve endpoint.

1 files changed, 7 insertions, 6 deletions

diff --git a/test/buildtool/file_system/git_repo.test.cpp b/test/buildtool/file_system/git_repo.test.cpp
index ac346ffb..e9992a97 100644
--- a/test/buildtool/file_system/git_repo.test.cpp
+++ b/test/buildtool/file_system/git_repo.test.cpp
@@ -251,15 +251,15 @@ TEST_CASE("Single-threaded fake repository operations", "[git_repo]") {
         SECTION("Get base tree id") {
             auto entry_root_c =
                 repo->GetSubtreeFromCommit(kRootCommit, ".", logger);
-            REQUIRE(entry_root_c);
-            CHECK(*entry_root_c == kRootId);
+            REQUIRE(std::holds_alternative<std::string>(entry_root_c));
+            CHECK(std::get<std::string>(entry_root_c) == kRootId);
         }
 
         SECTION("Get inner tree id") {
             auto entry_baz_c =
                 repo->GetSubtreeFromCommit(kRootCommit, "baz", logger);
-            REQUIRE(entry_baz_c);
-            CHECK(*entry_baz_c == kBazId);
+            REQUIRE(std::holds_alternative<std::string>(entry_baz_c));
+            CHECK(std::get<std::string>(entry_baz_c) == kBazId);
         }
     }
 
@@ -482,8 +482,9 @@ TEST_CASE("Multi-threaded fake repository operations", "[git_repo]") {
                             auto entry_baz_c =
                                 remote_repo->GetSubtreeFromCommit(
                                     kRootCommit, "baz", logger);
-                            REQUIRE(entry_baz_c);
-                            CHECK(*entry_baz_c == kBazId);
+                            REQUIRE(std::holds_alternative<std::string>(
+                                entry_baz_c));
+                            CHECK(std::get<std::string>(entry_baz_c) == kBazId);
                         } break;
                         case 1: {
                             auto remote_repo = GitRepo::Open(remote_cas);