[bug#73465] Wireguard: Rename field private-key to private-key-file

[Apoorv Singh <apoorvs569@gmail.com>]

I made some changes, here is the output of `git diff`,

```
diff --git a/gnu/services/vpn.scm b/gnu/services/vpn.scm
index eee7e78c6d..ebac4ad943 100644
--- a/gnu/services/vpn.scm
+++ b/gnu/services/vpn.scm
@@ -67,7 +67,8 @@ (define-module (gnu services vpn)
             wireguard-peer-endpoint
             wireguard-peer-allowed-ips
             wireguard-peer-public-key
-            wireguard-peer-preshared-key
+            wireguard-peer-preshared-key  ; deprecated
+            wireguard-peer-preshared-key-file
             wireguard-peer-keep-alive

             wireguard-configuration
@@ -79,7 +80,8 @@ (define-module (gnu services vpn)
             wireguard-configuration-dns
             wireguard-configuration-monitor-ips?
             wireguard-configuration-monitor-ips-interval
-            wireguard-configuration-private-key
+            wireguard-configuration-private-key  ; deprecated
+            wireguard-configuration-private-key-file
             wireguard-configuration-peers
             wireguard-configuration-pre-up
             wireguard-configuration-post-up
@@ -721,15 +723,17 @@ (define strongswan-service-type
 (define-record-type* <wireguard-peer>
   wireguard-peer make-wireguard-peer
   wireguard-peer?
-  (name              wireguard-peer-name)
-  (endpoint          wireguard-peer-endpoint
-                     (default #f))     ;string
-  (public-key        wireguard-peer-public-key)   ;string
-  (preshared-key     wireguard-peer-preshared-key
-                     (default #f))     ;string
-  (allowed-ips       wireguard-peer-allowed-ips) ;list of strings
-  (keep-alive        wireguard-peer-keep-alive
-                     (default #f)))    ;integer
+  (name               wireguard-peer-name)
+  (endpoint           wireguard-peer-endpoint
+                      (default #f))     ;string
+  (public-key         wireguard-peer-public-key)   ;string
+  (preshared-key      wireguard-peer-preshared-key ;deprecated
+                      (default #f))     ;string
+  (preshared-key-file wireguard-peer-preshared-key-file
+                      (default #f))     ;string
+  (allowed-ips        wireguard-peer-allowed-ips) ;list of 
strings
+  (keep-alive         wireguard-peer-keep-alive
+                      (default #f)))    ;integer

 (define-record-type* <wireguard-configuration>
   wireguard-configuration make-wireguard-configuration
@@ -742,6 +746,8 @@ (define-record-type* <wireguard-configuration>
                       (default '("10.0.0.1/32")))
   (port               wireguard-configuration-port ;integer
                       (default 51820))
+  (private-key        wireguard-configuration-private-key ;string 
;deprecated
+                      (default "/etc/wireguard/private.key"))
   (private-key-file   wireguard-configuration-private-key-file 
   ;string
                       (default "/etc/wireguard/private.key"))
   (peers              wireguard-configuration-peers ;list of 
   <wiregard-peer>
@@ -778,18 +784,29 @@ (define (peer->config peer)
         (string-join (remove string-null? lines) "\n"))))

   (define (peers->preshared-keys peer keys)
-    (let ((public-key (wireguard-peer-public-key peer))
-          (preshared-key (wireguard-peer-preshared-key peer)))
-      (if preshared-key
-          (cons* public-key preshared-key keys)
+    (let* ((public-key (wireguard-peer-public-key peer))
+          (preshared-key (wireguard-peer-preshared-key peer))
+          (preshared-key-file (wireguard-peer-preshared-key-file 
peer))
+          (final-preshared-key (or preshared-key 
preshared-key-file)))
+      ;; XXX Warn about deprecated preshared-key field with newer 
replacement
+      (when preshared-key
+        (warn-about-deprecation 'preshared-key #f #:replacement 
'preshared-key-file))
+      (if final-preshared-key
+          (cons* public-key final-preshared-key keys)
           keys)))

   (match-record config <wireguard-configuration>
-    (wireguard interface addresses port private-key-file peers 
     dns
+    (wireguard interface addresses port private-key-file 
private-key peers dns
                pre-up post-up pre-down post-down table)
+
+    ;; XXX Warn about deprecated private-key field with newer 
replacement
+    (when private-key
+      (warn-about-deprecation 'private-key #f #:replacement 
'private-key-file))
+
     (let* ((config-file (string-append interface ".conf"))
            (peer-keys (fold peers->preshared-keys (list) peers))
            (peers (map peer->config peers))
+           (final-private-key (or private-key private-key-file))
            (config
             (computed-file
              "wireguard-config"
@@ -810,7 +827,7 @@ (define lines
                            (list (format #f "~{PreUp = ~a~%~}" 
                            pre-up)))
                     (format #f "PostUp = ~a set %i private-key 
                     ~a\
 ~{ peer ~a preshared-key ~a~}" #$(file-append wireguard 
 "/bin/wg")
-#$private-key-file '#$peer-keys)
+#$final-private-key '#$peer-keys)
                     #$@(if (null? post-up)
                            '()
                            (list (format #f "~{PostUp = ~a~%~}" 
                            post-up)))
@@ -836,23 +853,29 @@ (define lines

 (define (wireguard-activation config)
   (match-record config <wireguard-configuration>
-    (private-key-file wireguard)
-    #~(begin
-        (use-modules (guix build utils)
-                     (ice-9 popen)
-                     (ice-9 rdelim))
-        (mkdir-p (dirname #$private-key-file))
-        (unless (file-exists? #$private-key-file)
-          (let* ((pipe
-                  (open-input-pipe (string-append
-                                    #$(file-append wireguard 
                                      "/bin/wg")
-                                    " genkey")))
-                 (key (read-line pipe)))
-            (call-with-output-file #$private-key-file
-              (lambda (port)
-                (display key port)))
-            (chmod #$private-key-file #o400)
-            (close-pipe pipe))))))
+    (private-key private-key-file wireguard)
+
+    ;; XXX Warn about deprecated private-key field with newer 
replacement
+    (when private-key
+      (warn-about-deprecation 'private-key #f #:replacement 
'private-key-file))
+
+    (let ((final-private-key (or private-key private-key-file)))
+      #~(begin
+          (use-modules (guix build utils)
+                       (ice-9 popen)
+                       (ice-9 rdelim))
+          (mkdir-p (dirname #$final-private-key))
+          (unless (file-exists? #$final-private-key)
+            (let* ((pipe
+                    (open-input-pipe (string-append
+                                      #$(file-append wireguard 
"/bin/wg")
+                                      " genkey")))
+                   (key (read-line pipe)))
+              (call-with-output-file #$final-private-key
+                (lambda (port)
+                  (display key port)))
+              (chmod #$final-private-key #o400)
+              (close-pipe pipe)))))))

 ;;; XXX: Copied from (guix scripts pack), changing define to 
 define*.
 (define-syntax-rule (define-with-source (variable args ...) body 
 body* ...)
```

If this is desired way of doing this, I will share the formatted 
patch as an attachment. 

-- 
- Apoorv Singh
- Sent from Emacs.