Add a CPS_CONFIG_LIBDIR_NAME which overrides the libdir name rules

This allows our unit tests to be portable without having to explicitly
override Meson's libdir setting

Author: dcbaker

meson.build

@@ -39,7 +39,10 @@ test(
   find_program('python', version : '>=3.11', required : build_tests, disabler : true),
   args: [files('tests/runner.py'), cps_config, 'tests/cases.toml'],
   protocol : 'tap',
-  env : {'CPS_PREFIX_PATH' : meson.current_source_dir() / 'tests' / 'cases' },
+  env : {
+    'CPS_PREFIX_PATH' : meson.current_source_dir() / 'tests' / 'cases',
+    'CPS_CONFIG_LIBDIR_NAME' : 'lib',
+  },
 )
 
 dep_gtest = dependency('gtest_main', required : build_tests, disabler : true, allow_fallback : true)

src/cps/env.cpp

@@ -17,6 +17,9 @@ namespace cps {
         if (const char * env_c = std::getenv("CPS_PREFIX_PATH")) {
             env.cps_prefix_path = std::string(env_c);
         }
+        if (const char * env_c = std::getenv("CPS_CONFIG_LIBDIR_NAME")) {
+            env.libdir = std::string(env_c);
+        }
         if (std::getenv("PKG_CONFIG_DEBUG_SPEW") || std::getenv("CPS_CONFIG_DEBUG_SPEW")) {
             env.debug_spew = true;
         }

src/cps/env.hpp

@@ -12,6 +12,7 @@ namespace cps {
     struct Env {
         std::optional<std::string> cps_path = std::nullopt;
         std::optional<std::string> cps_prefix_path = std::nullopt;
+        std::optional<std::string> libdir = std::nullopt;
         bool debug_spew = false;
     };
 

src/cps/platform.cpp

@@ -8,12 +8,12 @@ namespace fs = std::filesystem;
 
 namespace cps::platform {
 
-    fs::path libdir() {
+    fs::path libdir(const Env & env) {
         // TODO: libdir needs to be configurable based on the personality,
         //       and different name schemes.
         //       This is complicated by the fact that different distros have
         //       different schemes.
-        return CPS_LIBDIR;
+        return env.libdir.value_or(CPS_LIBDIR);
     }
 
 } // namespace cps::platform

src/cps/platform.hpp

@@ -9,8 +9,10 @@
 
 #include <filesystem>
 
+#include "env.hpp"
+
 namespace cps::platform {
 
-    std::filesystem::path libdir();
+    std::filesystem::path libdir(const Env & env);
 
 } // namespace cps::platform

src/cps/search.cpp

@@ -105,7 +105,7 @@ namespace cps::search {
             roots.emplace_back("/usr");
             roots.emplace_back("/usr/local");
 
-            const std::vector<fs::path> segments{platform::libdir(), "share"};
+            const std::vector<fs::path> segments{platform::libdir(env), "share"};
             std::vector<fs::path> paths;
 
             if (env.cps_path) {
@@ -294,7 +294,7 @@ namespace cps::search {
             }
         }
 
-        fs::path calculate_prefix(const fs::path & path, std::string_view name) {
+        fs::path calculate_prefix(const fs::path & path, std::string_view name, const Env & env) {
             // TODO: Windows
             // TODO: Mac
 
@@ -319,7 +319,7 @@ namespace cps::search {
             }
             // Match only share or libdir, but not a potential odd situation
             // like `/opt/share/libdir/`
-            if (split.back() == "share" || split.back() == platform::libdir()) {
+            if (split.back() == "share" || split.back() == platform::libdir(env)) {
                 split.pop_back();
             }
             fs::path p{"/"};
@@ -407,8 +407,8 @@ namespace cps::search {
                 // TODO: Windows…
                 auto && split = utils::split(s, "/");
                 if (split[0] == "@prefix@") {
-                    auto p =
-                        prefix_path.value_or(calculate_prefix(node->data.package.cps_path, node->data.package.name));
+                    auto p = prefix_path.value_or(
+                        calculate_prefix(node->data.package.cps_path, node->data.package.name, env));
                     for (auto it = split.begin() + 1; it != split.end(); ++it) {
                         p /= *it;
                     }