Zpool: don't break -DBINARY_LINK_TYPE=dynamic

Fix #1233

CMakeLists.txt

@@ -71,6 +71,7 @@ cmake_dependent_option(ENABLE_DDCUTIL "Enable ddcutil" ON "LINUX" OFF)
 cmake_dependent_option(ENABLE_DIRECTX_HEADERS "Enable DirectX headers for WSL" ON "LINUX" OFF)
 cmake_dependent_option(ENABLE_ELF "Enable libelf" ON "LINUX OR FreeBSD OR ANDROID" OFF)
 cmake_dependent_option(ENABLE_THREADS "Enable multithreading" ON "Threads_FOUND" OFF)
+cmake_dependent_option(ENABLE_LIBZFS "Enable libzfs" ON "LINUX OR FreeBSD OR SunOS" OFF)
 
 option(ENABLE_SYSTEM_YYJSON "Use system provided (instead of fastfetch embedded) yyjson library" OFF)
 option(ENABLE_ASAN "Build fastfetch with ASAN (address sanitizer)" OFF)
@@ -1098,6 +1099,25 @@ ff_lib_enable(DIRECTX_HEADERS
     "DirectX-Headers"
     "DirectX-Headers"
 )
+# The system <libzfs.h> is only usable on SunOS. We provide our local copy of it so it's always available.
+if(ENABLE_LIBZFS)
+    if(BINARY_LINK_TYPE STREQUAL "dlopen")
+        target_compile_definitions(libfastfetch PRIVATE FF_HAVE_LIBZFS=1)
+    else()
+        set(CMAKE_REQUIRED_LIBRARIES_BACKUP ${CMAKE_REQUIRED_LIBRARIES})
+        set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} zfs)
+        check_function_exists("libzfs_init" LIBZFS_FOUND)
+        set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES_BACKUP})
+        if(NOT LIBZFS_FOUND)
+            message(STATUS "Library: missing: LIBZFS")
+        else()
+            message(STATUS "Library: found LIBZFS")
+            target_compile_definitions(libfastfetch PRIVATE FF_HAVE_LIBZFS=1)
+            target_link_libraries(libfastfetch PRIVATE zfs)
+        endif()
+    endif()
+endif()
+
 
 if(ENABLE_THREADS)
     target_compile_definitions(libfastfetch PRIVATE FF_HAVE_THREADS)

src/common/init.c

@@ -247,6 +247,9 @@ void ffListFeatures(void)
         #if FF_HAVE_ELF
             "libelf\n"
         #endif
+        #if FF_HAVE_LIBZFS
+            "libzfs\n"
+        #endif
         #if FF_HAVE_DIRECTX_HEADERS
             "Directx Headers\n"
         #endif

src/detection/zpool/zpool_linux.c

@@ -1,5 +1,7 @@
 #include "zpool.h"
 
+#ifdef FF_HAVE_LIBZFS
+
 #ifdef __sun
 #define FF_DISABLE_DLOPEN
 #include <libzfs.h>
@@ -98,3 +100,12 @@ const char* ffDetectZpool(FFlist* result /* list of FFZpoolResult */)
 
     return NULL;
 }
+
+#else
+
+const char* ffDetectZpool(FF_MAYBE_UNUSED FFlist* result)
+{
+    return "Fastfetch was compiled without libzfs support";
+}
+
+#endif