OS (Linux): fix lliurex detection (#1882)

* Proper detection of lliurex distribution

* fix newline

* Trim version and not versionID as assigned to lliurex-version  output

* Update os_linux.c

---------

Co-authored-by: Carter Li <[email protected]>

Author: juanma1980

src/detection/os/os_linux.c

@@ -89,6 +89,21 @@ FF_MAYBE_UNUSED static void getUbuntuFlavour(FFOSResult* result)
         ffStrbufSetStatic(&result->idLike, "ubuntu");
     }
 
+    if (ffPathExists("/usr/bin/lliurex-version", FF_PATHTYPE_FILE))
+	{
+        ffStrbufSetStatic(&result->name, "LliureX");
+        ffStrbufSetStatic(&result->id, "lliurex");
+        ffStrbufClear(&result->version);
+        if (ffProcessAppendStdOut(&result->version, (char* const[]) {
+            "/usr/bin/lliurex-version",
+            NULL,
+        }) == NULL) // 8.2.2
+            ffStrbufTrimRightSpace(&result->version);
+        ffStrbufSetF(&result->prettyName, "LliureX %s", result->version.chars);
+        ffStrbufSetStatic(&result->idLike, "ubuntu");
+        return;
+	}
+
     if(ffStrContains(xdgConfigDirs, "kde") || ffStrContains(xdgConfigDirs, "plasma") || ffStrContains(xdgConfigDirs, "kubuntu"))
     {
         ffStrbufSetStatic(&result->name, "Kubuntu");
@@ -169,15 +184,6 @@ FF_MAYBE_UNUSED static void getUbuntuFlavour(FFOSResult* result)
         ffStrbufSetStatic(&result->idLike, "ubuntu");
         return;
     }
-
-    if(ffStrContains(xdgConfigDirs, "lliurex"))
-    {
-        ffStrbufSetStatic(&result->name, "LliureX");
-        ffStrbufSetF(&result->prettyName, "LliureX %s", result->version.chars);
-        ffStrbufSetStatic(&result->id, "lliurex");
-        ffStrbufSetStatic(&result->idLike, "ubuntu");
-        return;
-    }
 }
 
 FF_MAYBE_UNUSED static void getDebianVersion(FFOSResult* result)