feat: add reth init and reth import (#877)

Co-authored-by: Dan Cline <6798349+Rjected@users.noreply.github.com>

crates/primitives/src/chain/mod.rs

@@ -7,7 +7,9 @@ use std::{fmt, str::FromStr};
 
 // The chain spec module.
 mod spec;
-pub use spec::{ChainSpec, ChainSpecBuilder, ForkCondition, GOERLI, MAINNET, SEPOLIA};
+pub use spec::{
+    AllGenesisFormats, ChainSpec, ChainSpecBuilder, ForkCondition, GOERLI, MAINNET, SEPOLIA,
+};
 
 // The chain info module.
 mod info;

crates/primitives/src/chain/spec.rs

@@ -260,6 +260,37 @@ impl From<EthersGenesis> for ChainSpec {
     }
 }
 
+/// A helper type for compatibility with geth's config
+#[derive(Debug, Clone, Deserialize)]
+#[serde(untagged)]
+pub enum AllGenesisFormats {
+    /// The geth genesis format
+    Geth(EthersGenesis),
+    /// The reth genesis format
+    Reth(ChainSpec),
+}
+
+impl From<EthersGenesis> for AllGenesisFormats {
+    fn from(genesis: EthersGenesis) -> Self {
+        Self::Geth(genesis)
+    }
+}
+
+impl From<ChainSpec> for AllGenesisFormats {
+    fn from(genesis: ChainSpec) -> Self {
+        Self::Reth(genesis)
+    }
+}
+
+impl From<AllGenesisFormats> for ChainSpec {
+    fn from(genesis: AllGenesisFormats) -> Self {
+        match genesis {
+            AllGenesisFormats::Geth(genesis) => genesis.into(),
+            AllGenesisFormats::Reth(genesis) => genesis,
+        }
+    }
+}
+
 /// A helper to build custom chain specs
 #[derive(Debug, Default)]
 pub struct ChainSpecBuilder {

crates/primitives/src/lib.rs

@@ -38,7 +38,8 @@ pub use bits::H512;
 pub use block::{Block, BlockHashOrNumber, SealedBlock};
 pub use bloom::Bloom;
 pub use chain::{
-    Chain, ChainInfo, ChainSpec, ChainSpecBuilder, ForkCondition, GOERLI, MAINNET, SEPOLIA,
+    AllGenesisFormats, Chain, ChainInfo, ChainSpec, ChainSpecBuilder, ForkCondition, GOERLI,
+    MAINNET, SEPOLIA,
 };
 pub use constants::{
     EMPTY_OMMER_ROOT, GOERLI_GENESIS, KECCAK_EMPTY, MAINNET_GENESIS, SEPOLIA_GENESIS,