add optional python_site_packages_path in repodata

Add support for the optional python_site_packages_path field that can
appear in repodata for python packages to specify the location of the
site-packages directory.

This optional field is defined in CEP-17.

Author: jjhelmus

libmamba/ext/solv-cpp/include/solv-cpp/solvable.hpp

@@ -53,6 +53,7 @@ namespace solv
         auto build_string() const -> std::string_view;
         auto file_name() const -> std::string_view;
         auto license() const -> std::string_view;
+        auto python_site_packages_path() const -> std::string_view;
         auto md5() const -> std::string_view;
         auto noarch() const -> std::string_view;
         auto sha256() const -> std::string_view;
@@ -168,6 +169,17 @@ namespace solv
         void set_license(raw_str_view str) const;
         void set_license(const std::string& str) const;
 
+        /**
+         * Set the python_site_packages_path of the solvable.
+         *
+         * This is not used by libsolv and is purely for data storing.
+         *
+         * @note A call to @ref ObjRepoView::internalize is required for this attribute to
+         *       be available for lookup.
+         */
+        void set_python_site_packages_path(raw_str_view str) const;
+        void set_python_site_packages_path(const std::string& str) const;
+
         /**
          * Set the md5 hash of the solvable file.
          *

libmamba/ext/solv-cpp/src/solvable.cpp

@@ -206,6 +206,21 @@ namespace solv
         return set_license(str.c_str());
     }
 
+    auto ObjSolvableViewConst::python_site_packages_path() const -> std::string_view
+    {
+        return ptr_to_strview(::solvable_lookup_str(const_cast<::Solvable*>(raw()), SOLVABLE_MEDIABASE));
+    }
+
+    void ObjSolvableView::set_python_site_packages_path(raw_str_view str) const
+    {
+        ::solvable_set_str(raw(), SOLVABLE_MEDIABASE, str);
+    }
+
+    void ObjSolvableView::set_python_site_packages_path(const std::string& str) const
+    {
+        return set_python_site_packages_path(str.c_str());
+    }
+
     auto ObjSolvableViewConst::md5() const -> std::string_view
     {
         ::Id type = 0;

libmamba/include/mamba/specs/package_info.hpp

@@ -46,6 +46,7 @@ namespace mamba::specs
         std::string license = {};
         std::string md5 = {};
         std::string sha256 = {};
+        std::string python_site_packages_path = {};
         std::string signatures = {};
         std::vector<std::string> track_features = {};
         std::vector<std::string> dependencies = {};

libmamba/include/mamba/specs/repo_data.hpp

@@ -63,6 +63,9 @@ namespace mamba::specs
         /** Optionally a SHA256 hash of the package archive. */
         std::optional<std::string> sha256 = {};
 
+        /** Optionally a path to the site-packages directory. */
+        std::optional<std::string> python_site_packages_path = {};
+
         /** A deprecated md5 hash. */
         std::optional<std::string> legacy_bz2_md5 = {};
 

libmamba/src/solver/libsolv/helpers.cpp

@@ -69,6 +69,7 @@ namespace mamba::solver::libsolv
         );
         solv.set_md5(pkg.md5);
         solv.set_sha256(pkg.sha256);
+        solv.set_python_site_packages_path(pkg.python_site_packages_path);
 
         for (const auto& dep : pkg.dependencies)
         {
@@ -110,6 +111,7 @@ namespace mamba::solver::libsolv
         out.timestamp = s.timestamp();
         out.md5 = s.md5();
         out.sha256 = s.sha256();
+        out.python_site_packages_path = s.python_site_packages_path();
         out.signatures = s.signatures();
 
         const auto dep_to_str = [&pool](solv::DependencyId id)
@@ -265,6 +267,11 @@ namespace mamba::solver::libsolv
                 solv.set_sha256(sha256.value_unsafe());
             }
 
+            if (auto python_site_packages_path = pkg["python_site_packages_path"].get_c_str(); !python_site_packages_path.error())
+            {
+                solv.set_python_site_packages_path(python_site_packages_path.value_unsafe());
+            }
+
             if (auto elem = pkg["noarch"]; !elem.error())
             {
                 if (auto val = elem.get_bool(); !val.error() && val.value_unsafe())

libmamba/src/specs/package_info.cpp

@@ -337,6 +337,7 @@ namespace mamba::specs
                 p.dependencies,
                 p.constrains,
                 p.signatures,
+                p.python_site_packages_path,
                 p.defaulted_keys
             );
         }
@@ -383,6 +384,10 @@ namespace mamba::specs
         {
             j["signatures"] = pkg.signatures;
         }
+        if (!pkg.python_site_packages_path.empty())
+        {
+            j["python_site_packages_path"] = pkg.python_site_packages_path;
+        }
         if (pkg.dependencies.empty())
         {
             j["depends"] = nlohmann::json::array();
@@ -425,6 +430,7 @@ namespace mamba::specs
         pkg.md5 = j.value("md5", "");
         pkg.sha256 = j.value("sha256", "");
         pkg.signatures = j.value("signatures", "");
+        pkg.python_site_packages_path = j.value("python_site_packages_path", "");
         if (auto it = j.find("track_features"); it != j.end())
         {
             if (it->is_string() && !it->get<std::string_view>().empty())

libmamba/src/specs/repo_data.cpp

@@ -22,6 +22,7 @@ namespace mamba::specs
         j["subdir"] = p.subdir;
         j["md5"] = p.md5;
         j["sha256"] = p.sha256;
+        j["python_site_packages_path"] = p.python_site_packages_path;
         j["legacy_bz2_md5"] = p.legacy_bz2_md5;
         j["legacy_bz2_size"] = p.legacy_bz2_size;
         j["size"] = p.size;
@@ -50,6 +51,7 @@ namespace mamba::specs
         deserialize_maybe_missing(j, "subdir", p.subdir);
         deserialize_maybe_missing(j, "md5", p.md5);
         deserialize_maybe_missing(j, "sha256", p.sha256);
+        deserialize_maybe_missing(j, "python_site_packages_path", p.python_site_packages_path);
         deserialize_maybe_missing(j, "legacy_bz2_md5", p.legacy_bz2_md5);
         deserialize_maybe_missing(j, "legacy_bz2_size", p.legacy_bz2_size);
         deserialize_maybe_missing(j, "size", p.size);