ucode: fix reusing the current environment in uloop.process()

Signed-off-by: Felix Fietkau <[email protected]>

package/utils/ucode/patches/110-uloop-allow-reusing-the-existing-environment.patch

@@ -0,0 +1,57 @@
+From: Felix Fietkau <[email protected]>
+Date: Wed, 8 Oct 2025 19:11:46 +0200
+Subject: [PATCH] uloop: allow reusing the existing environment
+
+When passing null as environment argument, reuse existing environ.
+This makes it possible to avoid having to duplicate and convert it
+by passing the output of getenv().
+
+Signed-off-by: Felix Fietkau <[email protected]>
+---
+
+--- a/lib/uloop.c
++++ b/lib/uloop.c
+@@ -1016,7 +1016,22 @@ uc_uloop_process(uc_vm_t *vm, size_t nar
+ 
+ 	if (pid == 0) {
+ 		argp = calloc(ucv_array_length(arguments) + 2, sizeof(char *));
+-		envp = calloc(ucv_object_length(env_arg) + 1, sizeof(char *));
++		envp = environ;
++
++		if (env_arg) {
++			envp = calloc(ucv_object_length(env_arg) + 1, sizeof(char *));
++			i = 0;
++			ucv_object_foreach(env_arg, envk, envv) {
++				buf = xprintbuf_new();
++
++				ucv_stringbuf_printf(buf, "%s=", envk);
++				ucv_to_stringbuf(vm, buf, envv, false);
++
++				envp[i++] = buf->buf;
++
++				free(buf);
++			}
++		}
+ 
+ 		if (!argp || !envp)
+ 			_exit(-1);
+@@ -1026,19 +1041,6 @@ uc_uloop_process(uc_vm_t *vm, size_t nar
+ 		for (i = 0; i < ucv_array_length(arguments); i++)
+ 			argp[i+1] = ucv_to_string(vm, ucv_array_get(arguments, i));
+ 
+-		i = 0;
+-
+-		ucv_object_foreach(env_arg, envk, envv) {
+-			buf = xprintbuf_new();
+-
+-			ucv_stringbuf_printf(buf, "%s=", envk);
+-			ucv_to_stringbuf(vm, buf, envv, false);
+-
+-			envp[i++] = buf->buf;
+-
+-			free(buf);
+-		}
+-
+ 		execvpe((const char *)ucv_string_get(executable),
+ 		        (char * const *)argp, (char * const *)envp);
+