build: resolve the default build profiles from the distro data

src/build/env.rs

@@ -135,15 +135,15 @@ pub fn vendor_from_origins_content(content: &str) -> Option<String> {
 
 /// Default build profiles applied by vendor hooks.
 ///
-/// The Ubuntu vendor module activates `derivative.ubuntu noudeb` by default;
+/// The distro data carries them (`build_profiles` of the vendor's
-/// Debian applies none. This mirrors what `Dpkg::BuildProfiles` resolves when
+/// distribution in `data/distro_info.yml` — the Ubuntu vendor activates
-/// `DEB_BUILD_PROFILES` is unset.
+/// `derivative.ubuntu noudeb`, Debian applies none), mirroring what
+/// `Dpkg::BuildProfiles` resolves when `DEB_BUILD_PROFILES` is unset. The
+/// vendor is matched case-insensitively against the distro data keys
+/// (dpkg's `Vendor:` field keeps its original casing); a vendor with no
+/// distro entry gets no profiles.
 pub fn default_build_profiles(vendor: &str) -> Vec<String> {
-    if vendor.eq_ignore_ascii_case("ubuntu") {
+    crate::distro_info::get_build_profiles(&vendor.to_lowercase()).unwrap_or_default()
-        vec!["derivative.ubuntu".to_string(), "noudeb".to_string()]
-    } else {
-        Vec::new()
-    }
 }
 
 /// Resolve the active build profiles: explicit `-P` profiles take precedence,
@@ -378,6 +378,14 @@ mod tests {
             default_build_profiles("ubuntu"),
             vec!["derivative.ubuntu".to_string(), "noudeb".to_string()]
         );
+        // dpkg's Vendor field keeps its original casing; the distro data
+        // keys are lowercase.
+        assert_eq!(
+            default_build_profiles("Ubuntu"),
+            vec!["derivative.ubuntu".to_string(), "noudeb".to_string()]
+        );
+        // A vendor without a distro entry gets no profiles.
+        assert!(default_build_profiles("some-derivative").is_empty());
     }
 
     #[test]