[vcpkg] Change version field in `baseline.json` (#15633)

* [vcpkg] Change version field in `baseline.json`

* Change name from `version-tag` to `baseline`

* [vcpkg] x-history serializes version scheme

* Update e2e tests

* Update baseline e2e test

13 files changed, 149 insertions, 97 deletions

diff --git a/scripts/e2e_ports/port_versions/baseline.json b/scripts/e2e_ports/port_versions/baseline.json
index 953e8752d..98e63d8b5 100644
--- a/scripts/e2e_ports/port_versions/baseline.json
+++ b/scripts/e2e_ports/port_versions/baseline.json
@@ -1,3 +1,3 @@
 {
-	"vcpkg-internal-e2e-test-port": { "version-string": "1.0.0" }
+	"vcpkg-internal-e2e-test-port": { "baseline": "1.0.0" }
 }
diff --git a/scripts/generateBaseline.py b/scripts/generateBaseline.py
index 55bea6ba2..d70ab369b 100644
--- a/scripts/generateBaseline.py
+++ b/scripts/generateBaseline.py
@@ -11,6 +11,24 @@ PORTS_DIRECTORY = os.path.join(SCRIPT_DIRECTORY, '../ports')
 VERSIONS_DB_DIRECTORY = os.path.join(SCRIPT_DIRECTORY, '../port_versions')

 

 

+def get_version_tag(version):

+    if 'version' in version:

+        return version['version']

+    elif 'version-date' in version:

+        return version['version-date']

+    elif 'version-semver' in version:

+        return version['version-semver']

+    elif 'version-string' in version:

+        return version['version-string']

+    sys.exit(1)

+

+

+def get_version_port_version(version):

+    if 'port-version' in version:

+        return version['port-version']

+    return 0

+

+

 def generate_baseline():

     start_time = time.time()

 

@@ -35,18 +53,11 @@ def generate_baseline():
             try:

                 versions_object = json.load(db_file)

                 if versions_object['versions']:

-                    last_version = versions_object['versions'][0] 

-                    version_obj = {}

-                    if 'version' in last_version:

-                        version_obj['version'] = last_version['version']

-                    elif 'version-date' in last_version:

-                        version_obj['version-date'] = last_version['version-date']

-                    elif 'version-semver' in last_version:

-                        version_obj['version-semver'] - last_version['version-semver']

-                    else:

-                        version_obj['version-string'] = last_version['version-string']

-                    version_obj['port-version'] = last_version['port-version']

-                    baseline_entries[port_name] = version_obj

+                    last_version = versions_object['versions'][0]

+                    baseline_entries[port_name] = {

+                        'baseline': get_version_tag(last_version),

+                        'port-version': get_version_port_version(last_version)

+                    }

             except json.JSONDecodeError as e:

                 print(f'Error: Decoding {port_file_path}\n{e}\n')

     baseline_object = {}

diff --git a/scripts/testing/version-files/default-baseline-2/vcpkg.json b/scripts/testing/version-files/default-baseline-2/vcpkg.json
index 1e41002ff..af353c09d 100644
--- a/scripts/testing/version-files/default-baseline-2/vcpkg.json
+++ b/scripts/testing/version-files/default-baseline-2/vcpkg.json
@@ -1,7 +1,7 @@
 {
     "name": "default-baseline-test",
     "version-string": "0",
-    "$x-default-baseline": "cbd5a68012471f820b7cf28d618199b4a4d89c58",
+    "$x-default-baseline": "16002d9c2318dec4c69e02d9af8c0e11dca0d4c6",
     "dependencies": [
         "zlib"
     ]
diff --git a/scripts/testing/version-files/port_versions/baseline.json b/scripts/testing/version-files/port_versions/baseline.json
index bfe49f984..44a4764a1 100644
--- a/scripts/testing/version-files/port_versions/baseline.json
+++ b/scripts/testing/version-files/port_versions/baseline.json
@@ -1,19 +1,19 @@
 {
   "default": {
     "cat": {
-      "version-string": "1.0",
+      "baseline": "1.0",
       "port-version": 0
     },
     "dog": {
-      "version-string": "2001-01-01",
+      "baseline": "2001-01-01",
       "port-version": 0
     },
     "duck": {
-      "version-string": "mallard",
+      "baseline": "mallard",
       "port-version": 0
     },
     "mouse": {
-      "version-string": "1.0.0",
+      "baseline": "1.0.0",
       "port-version": 0
     }
   }
diff --git a/scripts/testing/version-files/port_versions_incomplete/baseline.json b/scripts/testing/version-files/port_versions_incomplete/baseline.json
index aadd634fc..7f27e5b65 100644
--- a/scripts/testing/version-files/port_versions_incomplete/baseline.json
+++ b/scripts/testing/version-files/port_versions_incomplete/baseline.json
@@ -1,19 +1,19 @@
 {
   "default": {
     "cat": {
-      "version-string": "1.0",
+      "baseline": "1.0",
       "port-version": 0
     },
     "dog": {
-      "version-string": "2001-01-01",
+      "baseline": "2001-01-01",
       "port-version": 0
     }, 
     "duck": {
-      "version-string": "mallard",
+      "baseline": "mallard",
       "port-version": 0
     },
     "fish": {
-      "version-string": "1.0.0",
+      "baseline": "1.0.0",
       "port-version": 0
     }
   }
diff --git a/toolsrc/include/vcpkg/registries.h b/toolsrc/include/vcpkg/registries.h
index c36c0179d..74782859d 100644
--- a/toolsrc/include/vcpkg/registries.h
+++ b/toolsrc/include/vcpkg/registries.h
@@ -106,8 +106,8 @@ namespace vcpkg
     std::unique_ptr<Json::IDeserializer<std::vector<Registry>>> get_registry_array_deserializer(
         const fs::path& configuration_directory);
 
-    ExpectedS<std::vector<std::pair<VersionT, std::string>>> get_builtin_versions(const VcpkgPaths& paths,
-                                                                                  StringView port_name);
+    ExpectedS<std::vector<std::pair<SchemedVersion, std::string>>> get_builtin_versions(const VcpkgPaths& paths,
+                                                                                        StringView port_name);
 
     ExpectedS<std::map<std::string, VersionT, std::less<>>> get_builtin_baseline(const VcpkgPaths& paths);
 }
diff --git a/toolsrc/include/vcpkg/sourceparagraph.h b/toolsrc/include/vcpkg/sourceparagraph.h
index 50417b8ad..f2dd0798b 100644
--- a/toolsrc/include/vcpkg/sourceparagraph.h
+++ b/toolsrc/include/vcpkg/sourceparagraph.h
@@ -12,6 +12,7 @@
 #include <vcpkg/packagespec.h>
 #include <vcpkg/paragraphparser.h>
 #include <vcpkg/platform-expression.h>
+#include <vcpkg/versiondeserializers.h>
 #include <vcpkg/versions.h>
 
 namespace vcpkg
@@ -107,6 +108,10 @@ namespace vcpkg
                                                           const FeatureFlagSettings& flags) const;
 
         VersionT to_versiont() const { return core_paragraph->to_versiont(); }
+        SchemedVersion to_schemed_version() const
+        {
+            return SchemedVersion{core_paragraph->version_scheme, core_paragraph->to_versiont()};
+        }
 
         friend bool operator==(const SourceControlFile& lhs, const SourceControlFile& rhs);
         friend bool operator!=(const SourceControlFile& lhs, const SourceControlFile& rhs) { return !(lhs == rhs); }
diff --git a/toolsrc/include/vcpkg/versiondeserializers.h b/toolsrc/include/vcpkg/versiondeserializers.h
index 02696d39b..ae368f6c5 100644
--- a/toolsrc/include/vcpkg/versiondeserializers.h
+++ b/toolsrc/include/vcpkg/versiondeserializers.h
@@ -11,6 +11,7 @@
 namespace vcpkg
 {
     Json::IDeserializer<VersionT>& get_versiont_deserializer_instance();
+    Json::IDeserializer<VersionT>& get_versiontag_deserializer_instance();
     std::unique_ptr<Json::IDeserializer<std::string>> make_version_deserializer(StringLiteral type_name);
 
     struct SchemedVersion
diff --git a/toolsrc/src/vcpkg/commands.add-version.cpp b/toolsrc/src/vcpkg/commands.add-version.cpp
index c650fa9dd..9d7a74465 100644
--- a/toolsrc/src/vcpkg/commands.add-version.cpp
+++ b/toolsrc/src/vcpkg/commands.add-version.cpp
@@ -16,21 +16,51 @@ using namespace vcpkg;
 
 namespace
 {
-    using VersionGitTree = std::pair<VersionT, std::string>;
+    constexpr StringLiteral BASELINE = "baseline";
+    constexpr StringLiteral VERSION_RELAXED = "version";
+    constexpr StringLiteral VERSION_SEMVER = "version-semver";
+    constexpr StringLiteral VERSION_DATE = "version-date";
+    constexpr StringLiteral VERSION_STRING = "version-string";
 
-    void insert_version_to_json_object(Json::Object& obj, const VersionT& version)
+    using VersionGitTree = std::pair<SchemedVersion, std::string>;
+
+    void insert_version_to_json_object(Json::Object& obj, const VersionT& version, StringLiteral version_field)
     {
-        obj.insert("version-string", Json::Value::string(version.text()));
+        obj.insert(version_field, Json::Value::string(version.text()));
         obj.insert("port-version", Json::Value::integer(version.port_version()));
     }
 
+    void insert_schemed_version_to_json_object(Json::Object& obj, const SchemedVersion& version)
+    {
+        if (version.scheme == Versions::Scheme::Relaxed)
+        {
+            return insert_version_to_json_object(obj, version.versiont, VERSION_RELAXED);
+        }
+
+        if (version.scheme == Versions::Scheme::Semver)
+        {
+            return insert_version_to_json_object(obj, version.versiont, VERSION_SEMVER);
+        }
+
+        if (version.scheme == Versions::Scheme::Date)
+        {
+            return insert_version_to_json_object(obj, version.versiont, VERSION_DATE);
+        }
+
+        if (version.scheme == Versions::Scheme::String)
+        {
+            return insert_version_to_json_object(obj, version.versiont, VERSION_STRING);
+        }
+        Checks::unreachable(VCPKG_LINE_INFO);
+    }
+
     static Json::Object serialize_baseline(const std::map<std::string, VersionT, std::less<>>& baseline)
     {
         Json::Object port_entries_obj;
         for (auto&& kv_pair : baseline)
         {
             Json::Object baseline_version_obj;
-            insert_version_to_json_object(baseline_version_obj, kv_pair.second);
+            insert_version_to_json_object(baseline_version_obj, kv_pair.second, BASELINE);
             port_entries_obj.insert(kv_pair.first, baseline_version_obj);
         }
 
@@ -46,7 +76,7 @@ namespace
         {
             Json::Object version_obj;
             version_obj.insert("git-tree", Json::Value::string(version.second));
-            insert_version_to_json_object(version_obj, version.first);
+            insert_schemed_version_to_json_object(version_obj, version.first);
             versions_array.push_back(std::move(version_obj));
         }
 
@@ -169,7 +199,7 @@ namespace
 
     static void update_version_db_file(const VcpkgPaths& paths,
                                        const std::string& port_name,
-                                       const VersionT& version,
+                                       const SchemedVersion& version,
                                        const std::string& git_tree,
                                        const fs::path& version_db_file_path,
                                        bool overwrite_version,
@@ -185,7 +215,7 @@ namespace
             {
                 System::printf(System::Color::success,
                                "Added version `%s` to `%s` (new file).\n",
-                               version.to_string(),
+                               version.versiont,
                                fs::u8string(version_db_file_path));
             }
             return;
@@ -200,13 +230,13 @@ namespace
                 versions->begin(), versions_end, [&](auto&& entry) -> bool { return entry.second == git_tree; });
             if (found_same_sha != versions_end)
             {
-                if (found_same_sha->first == version)
+                if (found_same_sha->first.versiont == version.versiont)
                 {
                     if (print_success)
                     {
                         System::printf(System::Color::success,
                                        "Version `%s` is already in `%s`\n",
-                                       version.to_string(),
+                                       version.versiont,
                                        fs::u8string(version_db_file_path));
                     }
                     return;
@@ -216,15 +246,16 @@ namespace
                                "-- SHA: %s\n"
                                "-- Did you remember to commit your changes?\n"
                                "***No files were updated.***\n",
-                               found_same_sha->first.to_string(),
+                               found_same_sha->first.versiont,
                                fs::u8string(version_db_file_path),
                                git_tree);
                 if (keep_going) return;
                 Checks::exit_fail(VCPKG_LINE_INFO);
             }
 
-            auto it = std::find_if(
-                versions->begin(), versions_end, [&](auto&& entry) -> bool { return entry.first == version; });
+            auto it = std::find_if(versions->begin(), versions_end, [&](auto&& entry) -> bool {
+                return entry.first.versiont == version.versiont;
+            });
 
             if (it != versions_end)
             {
@@ -239,7 +270,7 @@ namespace
                                    "-- Pass `--overwrite-version` to bypass this check.\n"
                                    "***No files were updated.***\n",
                                    port_name,
-                                   version.to_string(),
+                                   version.versiont,
                                    it->second,
                                    git_tree);
                     if (keep_going) return;
@@ -259,7 +290,7 @@ namespace
             {
                 System::printf(System::Color::success,
                                "Added version `%s` to `%s`.\n",
-                               version.to_string(),
+                               version.versiont,
                                fs::u8string(version_db_file_path));
             }
             return;
@@ -352,7 +383,7 @@ namespace vcpkg::Commands::AddVersion
             }
 
             const auto& scf = maybe_scf.value_or_exit(VCPKG_LINE_INFO);
-            const auto& versiont = scf->to_versiont();
+            const auto& schemed_version = scf->to_schemed_version();
 
             auto git_tree_it = git_tree_map.find(port_name);
             if (git_tree_it == git_tree_map.end())
@@ -370,8 +401,8 @@ namespace vcpkg::Commands::AddVersion
             auto port_versions_path =
                 paths.builtin_port_versions / Strings::concat(port_name[0], '-') / Strings::concat(port_name, ".json");
             update_version_db_file(
-                paths, port_name, versiont, git_tree, port_versions_path, overwrite_version, verbose, add_all);
-            update_baseline_version(paths, port_name, versiont, baseline_path, verbose);
+                paths, port_name, schemed_version, git_tree, port_versions_path, overwrite_version, verbose, add_all);
+            update_baseline_version(paths, port_name, schemed_version.versiont, baseline_path, verbose);
         }
         Checks::exit_success(VCPKG_LINE_INFO);
     }
diff --git a/toolsrc/src/vcpkg/commands.civerifyversions.cpp b/toolsrc/src/vcpkg/commands.civerifyversions.cpp
index a0de254c5..00c95f792 100644
--- a/toolsrc/src/vcpkg/commands.civerifyversions.cpp
+++ b/toolsrc/src/vcpkg/commands.civerifyversions.cpp
@@ -85,23 +85,23 @@ namespace vcpkg::Commands::CIVerifyVersions
                         return {
                             Strings::format("Error: Unable to parse `%s` used in version `%s`.\n%s\n",
                                             treeish,
-                                            version_entry.first.to_string(),
+                                            version_entry.first.versiont,
                                             maybe_scf.error()->error),
                             expected_right_tag,
                         };
                     }
 
                     const auto& scf = maybe_scf.value_or_exit(VCPKG_LINE_INFO);
-                    auto&& git_tree_version = scf.get()->to_versiont();
-                    if (version_entry.first != git_tree_version)
+                    auto&& git_tree_version = scf.get()->to_schemed_version();
+                    if (version_entry.first.versiont != git_tree_version.versiont)
                     {
                         return {
                             Strings::format("Error: Version in git-tree `%s` does not match version in file "
                                             "`%s`.\n\tgit-tree version: %s\n\t    file version: %s\n",
                                             version_entry.second,
                                             fs::u8string(versions_file_path),
-                                            git_tree_version.to_string(),
-                                            version_entry.first.to_string()),
+                                            git_tree_version.versiont,
+                                            version_entry.first.versiont),
                             expected_right_tag,
                         };
                     }
@@ -115,7 +115,7 @@ namespace vcpkg::Commands::CIVerifyVersions
                         Strings::format("Error: The git-tree `%s` for version `%s` in `%s` does not contain a "
                                         "CONTROL file or vcpkg.json file.",
                                         version_entry.second,
-                                        version_entry.first,
+                                        version_entry.first.versiont,
                                         fs::u8string(versions_file_path)),
                         expected_right_tag,
                     };
@@ -134,17 +134,18 @@ namespace vcpkg::Commands::CIVerifyVersions
             };
         }
 
-        const auto found_version = maybe_scf.value_or_exit(VCPKG_LINE_INFO)->to_versiont();
-        if (top_entry.first != found_version)
+        const auto found_version = maybe_scf.value_or_exit(VCPKG_LINE_INFO)->to_schemed_version();
+        if (top_entry.first.versiont != found_version.versiont)
         {
             auto versions_end = versions.end();
-            auto it = std::find_if(
-                versions.begin(), versions_end, [&](auto&& entry) { return entry.first == found_version; });
+            auto it = std::find_if(versions.begin(), versions_end, [&](auto&& entry) {
+                return entry.first.versiont == found_version.versiont;
+            });
             if (it != versions_end)
             {
                 return {
                     Strings::format("Error: Version `%s` found but is not the top entry in `%s`.",
-                                    found_version,
+                                    found_version.versiont,
                                     fs::u8string(versions_file_path)),
                     expected_right_tag,
                 };
@@ -152,8 +153,9 @@ namespace vcpkg::Commands::CIVerifyVersions
             else
             {
                 return {
-                    Strings::format(
-                        "Error: Version `%s` not found in `%s`.", found_version, fs::u8string(versions_file_path)),
+                    Strings::format("Error: Version `%s` not found in `%s`.",
+                                    found_version.versiont,
+                                    fs::u8string(versions_file_path)),
                     expected_right_tag,
                 };
             }
@@ -165,7 +167,7 @@ namespace vcpkg::Commands::CIVerifyVersions
                 Strings::format("Error: Git tree-ish object for version `%s` in `%s` does not match local port files.\n"
                                 "\tLocal SHA: %s\n"
                                 "\t File SHA: %s",
-                                found_version,
+                                found_version.versiont,
                                 fs::u8string(versions_file_path),
                                 local_git_tree,
                                 top_entry.second),
@@ -183,7 +185,7 @@ namespace vcpkg::Commands::CIVerifyVersions
         }
 
         auto&& baseline_version = maybe_baseline->second;
-        if (baseline_version != top_entry.first)
+        if (baseline_version != top_entry.first.versiont)
         {
             return {
                 Strings::format("Error: The baseline version for port `%s` doesn't match the latest version.\n"
@@ -191,7 +193,7 @@ namespace vcpkg::Commands::CIVerifyVersions
                                 "\t  Latest version: %s (%s)",
                                 port_name,
                                 baseline_version,
-                                top_entry.first,
+                                top_entry.first.versiont,
                                 fs::u8string(versions_file_path)),
                 expected_right_tag,
             };
@@ -203,7 +205,7 @@ namespace vcpkg::Commands::CIVerifyVersions
                 Strings::format("Error: Git tree-ish object for version `%s` in `%s` does not match local port files.\n"
                                 "\tLocal SHA: %s\n"
                                 "\t File SHA: %s",
-                                found_version,
+                                found_version.versiont,
                                 fs::u8string(versions_file_path),
                                 local_git_tree,
                                 top_entry.second),
@@ -212,7 +214,7 @@ namespace vcpkg::Commands::CIVerifyVersions
         }
 
         return {
-            Strings::format("OK: %s\t%s -> %s\n", top_entry.second, port_name, top_entry.first),
+            Strings::format("OK: %s\t%s -> %s\n", top_entry.second, port_name, top_entry.first.versiont),
             expected_left_tag,
         };
     }
diff --git a/toolsrc/src/vcpkg/commands.porthistory.cpp b/toolsrc/src/vcpkg/commands.porthistory.cpp
index e6a7cd5df..392bde7d0 100644
--- a/toolsrc/src/vcpkg/commands.porthistory.cpp
+++ b/toolsrc/src/vcpkg/commands.porthistory.cpp
@@ -25,6 +25,7 @@ namespace vcpkg::Commands::PortHistory
             std::string version_string;
             std::string version;
             int port_version;
+            Versions::Scheme scheme;
         };
 
         const System::ExitCodeAndOutput run_git_command_inner(const VcpkgPaths& paths,
@@ -66,6 +67,7 @@ namespace vcpkg::Commands::PortHistory
                 {
                     auto version = scf->core_paragraph->version;
                     auto port_version = scf->core_paragraph->port_version;
+                    auto scheme = scf->core_paragraph->version_scheme;
                     return HistoryVersion{
                         port_name,
                         git_tree,
@@ -74,6 +76,7 @@ namespace vcpkg::Commands::PortHistory
                         Strings::concat(version, "#", port_version),
                         version,
                         port_version,
+                        scheme,
                     };
                 }
             }
@@ -193,8 +196,7 @@ namespace vcpkg::Commands::PortHistory
                 Json::Object object;
                 object.insert("git-tree", Json::Value::string(version.git_tree));
 
-                serialize_schemed_version(
-                    object, Versions::Scheme::String, version.version, version.port_version, true);
+                serialize_schemed_version(object, version.scheme, version.version, version.port_version, true);
                 versions_json.push_back(std::move(object));
             }
 
diff --git a/toolsrc/src/vcpkg/registries.cpp b/toolsrc/src/vcpkg/registries.cpp
index 31f3078de..7f84b5075 100644
--- a/toolsrc/src/vcpkg/registries.cpp
+++ b/toolsrc/src/vcpkg/registries.cpp
@@ -484,7 +484,7 @@ namespace
             {
                 const auto& version_value = pr.second;
                 VersionT version;
-                r.visit_in_key(version_value, pr.first, version, get_versiont_deserializer_instance());
+                r.visit_in_key(version_value, pr.first, version, get_versiontag_deserializer_instance());
 
                 result.emplace(pr.first.to_string(), std::move(version));
             }
@@ -964,15 +964,17 @@ namespace vcpkg
         return true;
     }
 
-    ExpectedS<std::vector<std::pair<VersionT, std::string>>> get_builtin_versions(const VcpkgPaths& paths,
-                                                                                  StringView port_name)
+    ExpectedS<std::vector<std::pair<SchemedVersion, std::string>>> get_builtin_versions(const VcpkgPaths& paths,
+                                                                                        StringView port_name)
     {
         auto maybe_versions =
             load_versions_file(paths.get_filesystem(), VersionDbType::Git, paths.builtin_port_versions, port_name);
         if (auto pversions = maybe_versions.get())
         {
             return Util::fmap(
-                *pversions, [](auto&& entry) -> auto { return std::make_pair(entry.version, entry.git_tree); });
+                *pversions, [](auto&& entry) -> auto {
+                    return std::make_pair(SchemedVersion{entry.scheme, entry.version}, entry.git_tree);
+                });
         }
 
         return maybe_versions.error();
diff --git a/toolsrc/src/vcpkg/versiondeserializers.cpp b/toolsrc/src/vcpkg/versiondeserializers.cpp
index 842bdade3..2892aa567 100644
--- a/toolsrc/src/vcpkg/versiondeserializers.cpp
+++ b/toolsrc/src/vcpkg/versiondeserializers.cpp
@@ -7,6 +7,7 @@ using namespace vcpkg::Versions;
 
 namespace
 {
+    constexpr StringLiteral BASELINE = "baseline";
     constexpr StringLiteral VERSION_RELAXED = "version";
     constexpr StringLiteral VERSION_SEMVER = "version-semver";
     constexpr StringLiteral VERSION_STRING = "version-string";
@@ -36,6 +37,26 @@ namespace
         }
         StringLiteral m_type;
     };
+
+    struct GenericVersionTDeserializer : Json::IDeserializer<VersionT>
+    {
+        GenericVersionTDeserializer(StringLiteral version_field) : m_version_field(version_field) { }
+        StringView type_name() const override { return " a version object"; }
+
+        Optional<VersionT> visit_object(Json::Reader& r, const Json::Object& obj) override
+        {
+            std::string version;
+            int port_version = 0;
+
+            static VersionDeserializer version_deserializer{"version"};
+
+            r.required_object_field(type_name(), obj, m_version_field, version, version_deserializer);
+            r.optional_object_field(obj, PORT_VERSION, port_version, Json::NaturalNumberDeserializer::instance);
+
+            return VersionT{std::move(version), port_version};
+        }
+        StringLiteral m_version_field;
+    };
 }
 
 namespace vcpkg
@@ -167,38 +188,15 @@ namespace vcpkg
         }
     }
 
-}
-
-namespace
-{
-    struct VersionTDeserializer final : Json::IDeserializer<VersionT>
+    Json::IDeserializer<VersionT>& get_versiont_deserializer_instance()
     {
-        StringView type_name() const override { return "a version object"; }
-        View<StringView> valid_fields() const override
-        {
-            static const StringView t[] = {VERSION_STRING, PORT_VERSION};
-            return t;
-        }
-
-        Optional<VersionT> visit_object(Json::Reader& r, const Json::Object& obj) override
-        {
-            std::string version;
-            int port_version = 0;
-
-            static VersionDeserializer version_deserializer{"version"};
-
-            r.required_object_field(type_name(), obj, VERSION_STRING, version, version_deserializer);
-            r.optional_object_field(obj, PORT_VERSION, port_version, Json::NaturalNumberDeserializer::instance);
-
-            return VersionT{std::move(version), port_version};
-        }
-        static VersionTDeserializer instance;
-    };
-
-    VersionTDeserializer VersionTDeserializer::instance;
-}
+        static GenericVersionTDeserializer deserializer(VERSION_STRING);
+        return deserializer;
+    }
 
-namespace vcpkg
-{
-    Json::IDeserializer<VersionT>& get_versiont_deserializer_instance() { return VersionTDeserializer::instance; }
+    Json::IDeserializer<VersionT>& get_versiontag_deserializer_instance()
+    {
+        static GenericVersionTDeserializer deserializer(BASELINE);
+        return deserializer;
+    }
 }