Added changelog to update data

src/AutoUpdate.cake

@@ -42,6 +42,7 @@
 (def-introspect-struct auto-update-metadata
   name ([] 64 char)
   latest-version int
+  changelog (* char)
   downloads (* auto-update-download) (override 'dynarray))
 
 (def-type-alias-global CURL void)
@@ -119,6 +120,8 @@
 ;; ./cryptography-cli create-signed-file Machsearch_Linux-x64.zip ~/website/updates/Machsearch/Machsearch_Linux-x64.auto-update
 ;; The download will only occur if the latest version is greater than current-application-version.
 ;; new-file-to-use-out-buffer will only be set if there was actually a newer file
+;; changelog-out may be null if not provided
+;; Note: Any more args and this should take an args struct, or return the metadata!
 (defun auto-update-download (curl (* CURL) public-key (* (unsigned char))
                              update-cakedata-url (* (const char))
                              current-application-version int
@@ -126,6 +129,7 @@
                              new-file-to-use-out-buffer (* char)
                              new-file-to-use-out-buffer-size size_t
                              new-version-out (* int)
+                             changelog-out (* (* char))
                              &return bool)
   (var update-metadata auto-update-metadata (array 0))
   (unless (auto-update-get-latest-version-metadata
@@ -185,9 +189,18 @@
   (snprintf new-file-to-use-out-buffer new-file-to-use-out-buffer-size "%s/%s"
             version-output-directory (path platform-download > file-to-use))
   (set (deref new-version-out) (field update-metadata latest-version))
+  (when changelog-out
+    (set (deref changelog-out) (field update-metadata changelog))
+    ;; Caller takes ownership
+    (set (field update-metadata changelog) null))
   (free-introspect-struct-fields auto-update-metadata--metadata (addr update-metadata) free)
   (return true))
 
+;; Retain the ability to use another allocator within this module
+(defun auto-update-changelog-free (changelog (* char))
+  (when changelog
+    (free changelog)))
+
 (comptime-cond
  ('auto-test
   (c-import "<stdio.h>")
@@ -199,8 +212,8 @@
     ;; zip test.zip TestSerialize.cakedata TestDictionarySerialize.cakedata
     ;; ./cryptography-cli create-signed-file test.zip ~/website/updates/Product/Product_Linux-x64.auto-update
     (var macoy-public-key ([] crypto_sign_PUBLICKEYBYTES (unsigned char))
-      (array 0x44 0xb2 0x64 0xe2 0x1b 0x8f 0x1e 0x23 0xc2 0x45 0xfc 0x74 0xa8 0x3c 0x4a 0xe2 0xcd
-             0xf6 0x89 0x17 0xbf 0x69 0xf8 0x16 0xb0 0x61 0xc5 0xd5 0xff 0x56 0xae 0xdb))
+      (array 0x8a 0xd0 0x2a 0x05 0x0a 0x57 0xe8 0x4c 0x7c 0x73 0xcf 0xdb 0x26 0xdd 0xb9 0xf7 0x6f 0x92
+             0x05 0xe6 0x5f 0xa5 0xf7 0xf4 0x50 0x87 0x33 0xec 0x5f 0xb0 0x66 0x84))
     (var update-cakedata-url (* (const char))
       "https://localhost:8888/updates/Machsearch/machsearch.cakedata")
     (var current-version int 0)
@@ -222,14 +235,18 @@
     (curl_easy_setopt curl CURLOPT_SSL_VERIFYHOST 0)
 
     (var new-version int 0)
+    (var changelog (* char) null)
     (unless (auto-update-download curl macoy-public-key update-cakedata-url current-version
                                   output-directory new-file-to-use (sizeof new-file-to-use)
-                                  (addr new-version))
+                                  (addr new-version) (addr changelog))
       (curl_easy_cleanup curl)
       (curl_global_cleanup)
       (return 1))
 
     (fprintf stderr "The update says I should use %s for version %d\n" new-file-to-use new-version)
+    (if changelog
+        (fprintf stderr "Changelog:\n%s\n" changelog)
+        (auto-update-changelog-free changelog))
 
     (curl_easy_cleanup curl)
     (curl_global_cleanup)