Enable redirects to sender using less own repositories

flake-module.nix

@@ -59,14 +59,16 @@
       config.permittedInsecurePackages = ["jitsi-meet-1.0.8043"];
 
       overlays = [
-        (final: prev: {
+        (_: prev: {
           alias-to-sieve = inputs.alias-to-sieve.packages.x86_64-linux.default; # add custom package to convert alias files to sieve scripts on the stalwart machine
-          stalwart-mail = assert lib.assertMsg (prev.stalwart-mail.version == "0.11.6-unstable-2025-02-04") "Copy the Cargo.lock file from upstream and reintroduce the patch to sieve-rs, then update this assert statement.";
-          /*
-          prev.stalwart-mail.overrideAttrs (
-          finalAttrs: prevAttrs:
-            prevAttrs
-          */
+          stalwart-mail = assert lib.assertMsg (prev.stalwart-mail.version == "0.11.6-unstable-2025-02-04") ''
+            1. If the bug https://github.com/stalwartlabs/sieve/issues/11 is resolved to our satisfaction, try to remove this overlay.
+            2. Check whether sieve-rs recieved new updates that our patch needs to be rebased upon.
+            3. Check whether the sieve-rs patch below that exchanges the dependency needs updates.
+            4. Then update the version comparison in this assert statement.
+            5. Update the `cargoHash` by setting it to `lib.fakeHash` and then inserting the result.
+            6. Check if we can get rid of alias-to-sieve when stalwart-mail has a builtin alias feature.
+          '';
             prev.stalwart-mail.override (
               let
                 rp = pkgs.rustPlatform;
@@ -78,13 +80,11 @@
                       rp.buildRustPackage (
                         args
                         // rec {
-                          src = final.fetchFromGitea {
-                            domain = "gitea.mathebau.de";
-                            owner = "gonne";
-                            repo = "stalwart-mail";
-                            rev = "549b7055f6419079bf0b0ddab5367f6e6834d265"; # Depend on sieve-rs without loop prevention
-                            hash = "sha256-6+EyQC9hIDbmf0VGhU4XzNxtw/OgdNSOkm4dTClrowM=";
-                          };
+                          cargoPatches = [
+                            # Let stalwart-mail depend on our own version of the sieve crate that does not have some “loop prevention” that disables redirects to the original sender.
+                            # We want to redirect to sender if we simulate alias files and not doing so barely prevents loops in my opinion.
+                            ./sieve-rs.patch
+                          ];
                           cargoHash = "sha256-fdOU2W/EtkBk+1VmNMkFZTGbwBTQQRelrheVFhiUqlg=";
                         }
                       );

sieve-rs.patch

@@ -0,0 +1,27 @@
+diff --git a/Cargo.lock b/Cargo.lock
+index be36759b..b4316639 100644
+--- a/Cargo.lock
++++ b/Cargo.lock
+@@ -6404,8 +6404,7 @@ checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+ [[package]]
+ name = "sieve-rs"
+ version = "0.6.0"
+-source = "registry+https://github.com/rust-lang/crates.io-index"
+-checksum = "15ac54053752c25a0e545dd1953de716abcc80b12cfe0b6c2f2c1c73759d4f45"
++source = "git+https://gitea.mathebau.de/Gonne/sieve-rs.git#71324550504c0f84fe3e814d05cbe22f90a3b228"
+ dependencies = [
+  "ahash 0.8.11",
+  "bincode",
+diff --git a/Cargo.toml b/Cargo.toml
+index f055474f..2b64c9ac 100644
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -63,3 +63,7 @@ incremental = false
+ debug-assertions = false
+ overflow-checks = false
+ rpath = false
++
++
++[patch.crates-io]
++sieve-rs = { git = 'https://gitea.mathebau.de/Gonne/sieve-rs.git' }
+