feat: Embed testnet chain spec in compiled binary

nodes_template/default.toml

@@ -4,7 +4,7 @@ data_dir = "default"
 path = "default/db"
 
 [chain]
-spec = "spec/dev.toml"
+spec = { Local = "spec/dev.toml" }
 
 [logger]
 file = "ckb.log"

spec/Cargo.toml

@@ -4,6 +4,8 @@ version = "0.8.0-pre"
 license = "MIT"
 authors = ["Nervos Core Dev <dev@nervos.org>"]
 edition = "2018"
+build = "build.rs"
+include = ["/chainspecs"]
 
 [dependencies]
 serde = "1.0"
@@ -13,3 +15,8 @@ numext-fixed-hash = { version = "0.1", features = ["support_rand", "support_heap
 numext-fixed-uint = { version = "0.1", features = ["support_rand", "support_heapsize", "support_serde"] }
 ckb-core = { path = "../core" }
 ckb-pow = { path = "../pow" }
+includedir = "0.5.0"
+phf = "0.7.21"
+
+[build-dependencies]
+includedir_codegen = "0.5.0"

spec/build.rs

@@ -0,0 +1,8 @@
+use includedir_codegen::Compression;
+
+fn main() {
+    includedir_codegen::start("FILES")
+        .dir("chainspecs", Compression::Gzip)
+        .build("chainspecs.rs")
+        .unwrap();
+}

spec/chainspecs/testnet/testnet.toml

@@ -0,0 +1,36 @@
+name = "ckb_testnet"
+
+[genesis]
+version = 0
+parent_hash = "0x0000000000000000000000000000000000000000000000000000000000000000"
+timestamp = 0
+txs_commit = "0x0000000000000000000000000000000000000000000000000000000000000000"
+txs_proposal = "0x0000000000000000000000000000000000000000000000000000000000000000"
+difficulty = "0x100"
+cellbase_id = "0x0000000000000000000000000000000000000000000000000000000000000000"
+uncles_hash = "0x0000000000000000000000000000000000000000000000000000000000000000"
+
+[genesis.seal]
+nonce = 0
+proof = [0]
+
+[params]
+initial_block_reward = 50000
+max_block_cycles = 100000000
+
+[pow]
+func = "Cuckoo"
+
+[pow.params]
+# the 2-log of the graph size, which is the size in bits of the node
+# identifiers
+edge_bits = 15
+
+# length of the cycle to be found, must be an even number, a minimum of 12 is
+# recommended
+cycle_length = 12
+
+# An array list paths to system cell files, which is absolute or relative to
+# the directory containing this config file.
+[[system_cells]]
+path = "cells/secp256k1_blake2b_lock"