From ef6183d8e335164183036bb161320897e07f4e95 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20de=20Kok?= <me@danieldk.eu>
Date: Wed, 14 Jan 2026 08:53:50 +0000
Subject: [PATCH] Add `general.license` field to `build.toml`

This can be used for card-filling and is added to the kernel build
metadata.
---
 build2cmake/src/config/mod.rs    |  4 ++++
 build2cmake/src/config/v1.rs     |  1 +
 build2cmake/src/config/v2.rs     |  1 +
 build2cmake/src/config/v3.rs     |  4 ++++
 build2cmake/src/metadata.rs      | 12 +++---------
 build2cmake/src/torch/common.rs  |  5 ++++-
 examples/silu-and-mul/build.toml |  1 +
 7 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/build2cmake/src/config/mod.rs b/build2cmake/src/config/mod.rs
index 816b4fea..a11f4e97 100644
--- a/build2cmake/src/config/mod.rs
+++ b/build2cmake/src/config/mod.rs
@@ -35,6 +35,10 @@ impl Build {
 
 pub struct General {
     pub name: String,
+
+    /// Hugging Face Hub license identifier.
+    pub license: Option<String>,
+
     pub backends: Vec<Backend>,
     pub hub: Option<Hub>,
     pub python_depends: Option<Vec<String>>,
diff --git a/build2cmake/src/config/v1.rs b/build2cmake/src/config/v1.rs
index 608f35d5..5bba9086 100644
--- a/build2cmake/src/config/v1.rs
+++ b/build2cmake/src/config/v1.rs
@@ -98,6 +98,7 @@ impl TryFrom<Build> for super::Build {
         Ok(Self {
             general: super::General {
                 name: build.general.name,
+                license: None,
                 backends,
                 hub: None,
                 python_depends: None,
diff --git a/build2cmake/src/config/v2.rs b/build2cmake/src/config/v2.rs
index 43e22117..86d4dc37 100644
--- a/build2cmake/src/config/v2.rs
+++ b/build2cmake/src/config/v2.rs
@@ -163,6 +163,7 @@ impl General {
 
         super::General {
             name: general.name,
+            license: None,
             backends,
             cuda,
             hub: general.hub.map(Into::into),
diff --git a/build2cmake/src/config/v3.rs b/build2cmake/src/config/v3.rs
index 770ec05a..bf3409ee 100644
--- a/build2cmake/src/config/v3.rs
+++ b/build2cmake/src/config/v3.rs
@@ -21,6 +21,8 @@ pub struct Build {
 pub struct General {
     pub name: String,
 
+    pub license: Option<String>,
+
     pub backends: Vec<Backend>,
 
     pub cuda: Option<CudaGeneral>,
@@ -141,6 +143,7 @@ impl From<General> for super::General {
     fn from(general: General) -> Self {
         Self {
             name: general.name,
+            license: general.license,
             backends: general.backends.into_iter().map(Into::into).collect(),
             cuda: general.cuda.map(Into::into),
             hub: general.hub.map(Into::into),
@@ -293,6 +296,7 @@ impl From<super::General> for General {
     fn from(general: super::General) -> Self {
         Self {
             name: general.name,
+            license: general.license,
             backends: general.backends.into_iter().map(Into::into).collect(),
             cuda: general.cuda.map(Into::into),
             hub: general.hub.map(Into::into),
diff --git a/build2cmake/src/metadata.rs b/build2cmake/src/metadata.rs
index a8a48601..d9f4abbc 100644
--- a/build2cmake/src/metadata.rs
+++ b/build2cmake/src/metadata.rs
@@ -3,13 +3,7 @@ use serde::{Deserialize, Serialize};
 #[derive(Debug, Deserialize, Serialize)]
 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 pub struct Metadata {
-    python_depends: Vec<String>,
-}
-
-impl Metadata {
-    pub fn new(python_depends: impl Into<Vec<String>>) -> Self {
-        Self {
-            python_depends: python_depends.into(),
-        }
-    }
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub license: Option<String>,
+    pub python_depends: Vec<String>,
 }
diff --git a/build2cmake/src/torch/common.rs b/build2cmake/src/torch/common.rs
index f98a97ba..e2ba4dcd 100644
--- a/build2cmake/src/torch/common.rs
+++ b/build2cmake/src/torch/common.rs
@@ -42,7 +42,10 @@ pub fn write_metadata(backend: Backend, general: &General, file_set: &mut FileSe
         .chain(general.backend_python_depends(backend))
         .collect::<Result<Vec<_>>>()?;
 
-    let metadata = Metadata::new(python_depends);
+    let metadata = Metadata {
+        license: general.license.clone(),
+        python_depends,
+    };
 
     serde_json::to_writer(writer, &metadata)?;
 
diff --git a/examples/silu-and-mul/build.toml b/examples/silu-and-mul/build.toml
index c42fbecc..7f022ef5 100644
--- a/examples/silu-and-mul/build.toml
+++ b/examples/silu-and-mul/build.toml
@@ -1,5 +1,6 @@
 [general]
 name = "silu-and-mul"
+license = "apache-2.0"
 backends = [
     "cpu",
     "cuda",