Remove duplicate macro

Add alternative strndup implementation

kubernetes/ConfigureChecks.cmake

@@ -0,0 +1,3 @@
+include(CheckFunctionExists)
+
+check_function_exists(strndup HAVE_STRNDUP)

kubernetes/PreTarget.cmake

@@ -1,3 +1,7 @@
+# config.h checks
+include(ConfigureChecks.cmake)
+configure_file(config.h.in ${CMAKE_CURRENT_BINARY_DIR}/config.h)
+
 list(APPEND SRCS
         config/kube_config_model.c
         config/kube_config_yaml.c
@@ -27,5 +31,5 @@ list(APPEND HDRS
         websocket/kube_exec.h
         include/generic.h)
 
-find_package(libwebsockets REQUIRED)
+find_package(libwebsockets CONFIG REQUIRED)
 find_package(yaml CONFIG REQUIRED)

kubernetes/config.h.in

@@ -0,0 +1,2 @@
+/* Define to 1 if you have the `strndup' function. */
+#cmakedefine HAVE_STRNDUP 1

kubernetes/config/kube_config_util.c

@@ -13,8 +13,6 @@
 #endif
 #include "../include/apiClient.h"
 
-#define KUBE_CONFIG_TEMPFILE_NAME_TEMPLATE "/tmp/kubeconfig-XXXXXX"
-
 static bool is_cert_or_key_base64_encoded(const char *data)
 {
     if (NULL == strstr(data, "BEGIN")) {

kubernetes/include/generic.h

@@ -14,6 +14,10 @@ typedef struct genericClient_t {
     char *resourcePlural;
 } genericClient_t;
 
+#if !defined(HAVE_STRNDUP)
+char *strndup(const char *s, size_t n);
+#endif /* ! HAVE_STRNDUP */
+
 genericClient_t* genericClient_create(apiClient_t *client, const char *apiGroup, const char* apiVersion, const char* resourcePlural);
 void genericClient_free(genericClient_t* client);
 

kubernetes/src/generic.c

@@ -1,6 +1,28 @@
 #include "../include/apiClient.h"
 #include "../include/generic.h"
 
+// based on https://github.com/libssh/libssh-mirror/commit/247983e9820fd264cb5a59c14cc12846c028bd08#diff-744295d01685fa411dbfd78679ea20b51dfa4ac7d2d722df53f3d86d728493f8
+#if !defined(HAVE_STRNDUP)
+char *strndup(const char *s, size_t n)
+{
+    char *x = NULL;
+
+    if (n + 1 < n) {
+        return NULL;
+    }
+
+    x = malloc(n + 1);
+    if (x == NULL) {
+        return NULL;
+    }
+
+    memcpy(x, s, n);
+    x[n] = '\0';
+
+    return x;
+}
+#endif /* ! HAVE_STRNDUP */
+
 genericClient_t* genericClient_create(apiClient_t *client, const char *apiGroup, const char* apiVersion, const char* resourcePlural) {
     genericClient_t *result = malloc(sizeof(genericClient_t));
     result->client = client;