Add signature handling for manifests

- Implemented support for fetching, importing, and storing signature payloads during transaction creation.
- Added the `Signature` struct to represent signature-related action data.
- Updated `Manifest` to include and process `signatures` as part of its fields.
- Enabled signature file imports with proper path resolution in `pkg6repo`.

libips/src/actions/mod.rs

@@ -790,6 +790,35 @@ impl From<Action> for Transform {
     }
 }
 
+#[derive(Debug, Default, PartialEq, Clone, Deserialize, Serialize, Diff)]
+#[diff(attr(
+    #[derive(Debug, PartialEq)]
+))]
+pub struct Signature {
+    pub value: String,
+    pub algorithm: String,
+    pub chain: String,
+    pub chash: String,
+    pub version: String,
+}
+
+impl From<Action> for Signature {
+    fn from(act: Action) -> Self {
+        let mut sig = Signature::default();
+        sig.value = act.payload_string;
+        for prop in act.properties {
+            match prop.key.as_str() {
+                "algorithm" => sig.algorithm = prop.value,
+                "chain" => sig.chain = prop.value,
+                "chash" => sig.chash = prop.value,
+                "version" => sig.version = prop.value,
+                _ => {}
+            }
+        }
+        sig
+    }
+}
+
 #[derive(Hash, Eq, PartialEq, Debug, Default, Clone, Deserialize, Serialize, Diff)]
 #[diff(attr(
     #[derive(Debug, PartialEq)]
@@ -827,6 +856,8 @@ pub struct Manifest {
     pub legacies: Vec<Legacy>,
     #[serde(skip_serializing_if = "Vec::is_empty", default)]
     pub transforms: Vec<Transform>,
+    #[serde(skip_serializing_if = "Vec::is_empty", default)]
+    pub signatures: Vec<Signature>,
 }
 
 impl Manifest {
@@ -843,6 +874,7 @@ impl Manifest {
             drivers: Vec::new(),
             legacies: Vec::new(),
             transforms: Vec::new(),
+            signatures: Vec::new(),
         }
     }
 
@@ -886,7 +918,7 @@ impl Manifest {
                 self.transforms.push(act.into());
             }
             ActionKind::Signature => {
-                debug!("signature action encountered, skipping for now");
+                self.signatures.push(act.into());
             }
             ActionKind::Unknown { action } => {
                 debug!("action {:?} not known, skipping", action);

libips/src/recv.rs

@@ -266,6 +266,23 @@ impl<'a, S: ReadableRepository + Sync> PackageReceiver<'a, S> {
             txn.add_file((*file).clone(), &temp_file_path)?;
         }
 
+        // Fetch signature payloads
+        for sig in &manifest.signatures {
+            if sig.value.is_empty() {
+                continue;
+            }
+
+            let digest = &sig.value;
+            let temp_file_path = temp_dir.path().join(format!("sig-{}", digest));
+            debug!("Fetching signature payload {} to {}", digest, temp_file_path.display());
+
+            self.source.fetch_payload(publisher, digest, &temp_file_path)?;
+
+            let mut sig_file_action = crate::actions::File::default();
+            sig_file_action.path = format!("signature-{}", digest);
+            txn.add_file(sig_file_action, &temp_file_path)?;
+        }
+
         txn.update_manifest(manifest.clone());
         txn.commit()?;
 

pkg6repo/src/pkg5_import.rs

@@ -554,6 +554,47 @@ impl Pkg5Importer {
             }
         }
 
+        // Import signature files
+        for signature in &manifest.signatures {
+            if signature.value.is_empty() {
+                continue;
+            }
+
+            let hash = &signature.value;
+            // Determine the file path in the source repository
+            let first_two = &hash[0..2];
+            let next_two = &hash[2..4];
+            let file_path_new = file_dir.join(first_two).join(next_two).join(hash);
+            let file_path_old = file_dir.join(first_two).join(hash);
+
+            let file_path = if file_path_new.exists() {
+                file_path_new
+            } else if file_path_old.exists() {
+                file_path_old
+            } else {
+                warn!(
+                    "Signature file not found in source repository: {}",
+                    hash
+                );
+                continue;
+            };
+
+            // Use a unique name for the signature file in the proto dir
+            let proto_sig_path = proto_dir.join(format!("signature-{}", hash));
+            if let Some(parent) = proto_sig_path.parent() {
+                fs::create_dir_all(parent).map_err(|e| Pkg6RepoError::IoError(e))?;
+            }
+
+            fs::copy(&file_path, &proto_sig_path).map_err(|e| Pkg6RepoError::IoError(e))?;
+
+            // We need a FileAction to add it to the transaction
+            // Even though it's a signature, FileBackend uses add_file to store payloads
+            let mut sig_file_action = libips::actions::File::default();
+            sig_file_action.path = format!("signature-{}", hash);
+            // transaction.add_file will calculate the hash and store it in the repo's file dir
+            transaction.add_file(sig_file_action, &proto_sig_path)?;
+        }
+
         // Update the manifest in the transaction
         transaction.update_manifest(manifest);