Subject: bug#41602: [PATCH v3] Prevent publication of non-substitutable derivation outputs

From: Morgan Arnold <[email-masked]>
Date: Thu, 06 Mar 2025 10:16:29 +0000

This commit prevents Guix substitute servers from distributing binaries which are marked non-substitutable. This prevents substitute servers from accidentally committing copyright violations by distributing binaries which are non-substitutable for copyright reasons.

Change-Id: Iaca81f5bdb430a12a3ad41e9b83e0bcc535af607
---
 guix/scripts/publish.scm | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/guix/scripts/publish.scm b/guix/scripts/publish.scm
index 6f993ef0d6..4650e4ef3a 100644
--- a/guix/scripts/publish.scm
+++ b/guix/scripts/publish.scm
@@ -61,6 +61,7 @@ (define-module (guix scripts publish)
   #:use-module (guix cache)
   #:use-module (guix ui)
   #:use-module (guix scripts)
+  #:use-module (guix derivations)
   #:use-module ((guix utils)
                 #:select (with-atomic-file-output compressed-file?))
   #:use-module ((guix build utils)
@@ -693,11 +694,15 @@ (define* (bake-narinfo+nar cache item
 (define* (render-nar store request store-item
                      #:key (compression %no-compression))
   "Render archive of the store path corresponding to STORE-ITEM."
-  (let ((store-path (string-append %store-directory "/" store-item)))
+  (let* ((store-path (string-append %store-directory "/" store-item))
+         (substitutable-store-item? (every substitutable-derivation?
+                                           (map read-derivation-from-file
+                                                (valid-derivers store
+                                                                store-path)))))
     ;; The ISO-8859-1 charset *must* be used otherwise HTTP clients will
     ;; interpret the byte stream as UTF-8 and arbitrarily change invalid byte
     ;; sequences.
-    (if (valid-path? store store-path)
+    (if (and substitutable-store-item? (valid-path? store store-path))
         (values `((content-type . (application/x-nix-archive
                                    (charset . "ISO-8859-1")))
                   (x-nar-compression . ,compression))

base-commit: 19c656e3cad3a4f1e3338a955a1af57e363545df
-- 
2.47.1