From 6cb5cb4c41e0d27ecd0d8c03d7fd25af38f954e1 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Mon, 11 Sep 2023 12:34:42 +0200
Subject: [PATCH 01/15] rococo-runtime: RococoGenesisExt removed

---
 polkadot/node/service/src/chain_spec.rs       | 72 +++----------------
 polkadot/runtime/rococo/Cargo.toml            |  2 +-
 polkadot/runtime/rococo/build.rs              | 20 ++++--
 polkadot/runtime/rococo/constants/Cargo.toml  |  3 +
 polkadot/runtime/rococo/constants/src/lib.rs  |  4 +-
 .../functional/0002-parachains-disputes.toml  |  2 +-
 .../0004-parachains-garbage-candidate.toml    |  2 +-
 .../zombienet_tests/misc/0001-paritydb.toml   |  2 +-
 8 files changed, 33 insertions(+), 74 deletions(-)

diff --git a/polkadot/node/service/src/chain_spec.rs b/polkadot/node/service/src/chain_spec.rs
index 1e5aaa807b81..1da364496a86 100644
--- a/polkadot/node/service/src/chain_spec.rs
+++ b/polkadot/node/service/src/chain_spec.rs
@@ -134,7 +134,7 @@ pub type WestendChainSpec = DummyChainSpec;
 
 /// The `ChainSpec` parameterized for the rococo runtime.
 #[cfg(feature = "rococo-native")]
-pub type RococoChainSpec = service::GenericChainSpec<RococoGenesisExt, Extensions>;
+pub type RococoChainSpec = service::GenericChainSpec<rococo::RuntimeGenesisConfig, Extensions>;
 
 /// The `ChainSpec` parameterized for the `versi` runtime.
 ///
@@ -146,30 +146,6 @@ pub type VersiChainSpec = RococoChainSpec;
 #[cfg(not(feature = "rococo-native"))]
 pub type RococoChainSpec = DummyChainSpec;
 
-/// Extension for the Rococo genesis config to support a custom changes to the genesis state.
-#[derive(serde::Serialize, serde::Deserialize)]
-#[cfg(feature = "rococo-native")]
-pub struct RococoGenesisExt {
-	/// The runtime genesis config.
-	runtime_genesis_config: rococo::RuntimeGenesisConfig,
-	/// The session length in blocks.
-	///
-	/// If `None` is supplied, the default value is used.
-	session_length_in_blocks: Option<u32>,
-}
-
-#[cfg(feature = "rococo-native")]
-impl sp_runtime::BuildStorage for RococoGenesisExt {
-	fn assimilate_storage(&self, storage: &mut sp_core::storage::Storage) -> Result<(), String> {
-		sp_state_machine::BasicExternalities::execute_with_storage(storage, || {
-			if let Some(length) = self.session_length_in_blocks.as_ref() {
-				rococo_runtime_constants::time::EpochDurationInBlocks::set(length);
-			}
-		});
-		self.runtime_genesis_config.assimilate_storage(storage)
-	}
-}
-
 pub fn polkadot_config() -> Result<PolkadotChainSpec, String> {
 	PolkadotChainSpec::from_json_bytes(&include_bytes!("../chain-specs/polkadot.json")[..])
 }
@@ -1128,10 +1104,7 @@ pub fn rococo_staging_testnet_config() -> Result<RococoChainSpec, String> {
 		"Rococo Staging Testnet",
 		"rococo_staging_testnet",
 		ChainType::Live,
-		move || RococoGenesisExt {
-			runtime_genesis_config: rococo_staging_testnet_config_genesis(wasm_binary),
-			session_length_in_blocks: None,
-		},
+		move || rococo_staging_testnet_config_genesis(wasm_binary),
 		boot_nodes,
 		Some(
 			TelemetryEndpoints::new(vec![(ROCOCO_STAGING_TELEMETRY_URL.to_string(), 0)])
@@ -1165,10 +1138,7 @@ pub fn versi_staging_testnet_config() -> Result<RococoChainSpec, String> {
 		"Versi Staging Testnet",
 		"versi_staging_testnet",
 		ChainType::Live,
-		move || RococoGenesisExt {
-			runtime_genesis_config: rococo_staging_testnet_config_genesis(wasm_binary),
-			session_length_in_blocks: Some(100),
-		},
+		move || rococo_staging_testnet_config_genesis(wasm_binary),
 		boot_nodes,
 		Some(
 			TelemetryEndpoints::new(vec![(VERSI_STAGING_TELEMETRY_URL.to_string(), 0)])
@@ -1718,11 +1688,7 @@ pub fn rococo_development_config() -> Result<RococoChainSpec, String> {
 		"Development",
 		"rococo_dev",
 		ChainType::Development,
-		move || RococoGenesisExt {
-			runtime_genesis_config: rococo_development_config_genesis(wasm_binary),
-			// Use 1 minute session length.
-			session_length_in_blocks: Some(10),
-		},
+		move || rococo_development_config_genesis(wasm_binary),
 		vec![],
 		None,
 		Some(DEFAULT_PROTOCOL_ID),
@@ -1741,11 +1707,7 @@ pub fn versi_development_config() -> Result<RococoChainSpec, String> {
 		"Development",
 		"versi_dev",
 		ChainType::Development,
-		move || RococoGenesisExt {
-			runtime_genesis_config: rococo_development_config_genesis(wasm_binary),
-			// Use 1 minute session length.
-			session_length_in_blocks: Some(10),
-		},
+		move || rococo_development_config_genesis(wasm_binary),
 		vec![],
 		None,
 		Some("versi"),
@@ -1765,11 +1727,7 @@ pub fn wococo_development_config() -> Result<RococoChainSpec, String> {
 		"Development",
 		"wococo_dev",
 		ChainType::Development,
-		move || RococoGenesisExt {
-			runtime_genesis_config: rococo_development_config_genesis(wasm_binary),
-			// Use 1 minute session length.
-			session_length_in_blocks: Some(10),
-		},
+		move || rococo_development_config_genesis(wasm_binary),
 		vec![],
 		None,
 		Some(WOCOCO_DEV_PROTOCOL_ID),
@@ -1888,11 +1846,7 @@ pub fn rococo_local_testnet_config() -> Result<RococoChainSpec, String> {
 		"Rococo Local Testnet",
 		"rococo_local_testnet",
 		ChainType::Local,
-		move || RococoGenesisExt {
-			runtime_genesis_config: rococo_local_testnet_genesis(wasm_binary),
-			// Use 1 minute session length.
-			session_length_in_blocks: Some(10),
-		},
+		move || rococo_local_testnet_genesis(wasm_binary),
 		vec![],
 		None,
 		Some(DEFAULT_PROTOCOL_ID),
@@ -1927,11 +1881,7 @@ pub fn wococo_local_testnet_config() -> Result<RococoChainSpec, String> {
 		"Wococo Local Testnet",
 		"wococo_local_testnet",
 		ChainType::Local,
-		move || RococoGenesisExt {
-			runtime_genesis_config: wococo_local_testnet_genesis(wasm_binary),
-			// Use 1 minute session length.
-			session_length_in_blocks: Some(10),
-		},
+		move || wococo_local_testnet_genesis(wasm_binary),
 		vec![],
 		None,
 		Some(DEFAULT_PROTOCOL_ID),
@@ -1966,11 +1916,7 @@ pub fn versi_local_testnet_config() -> Result<RococoChainSpec, String> {
 		"Versi Local Testnet",
 		"versi_local_testnet",
 		ChainType::Local,
-		move || RococoGenesisExt {
-			runtime_genesis_config: versi_local_testnet_genesis(wasm_binary),
-			// Use 1 minute session length.
-			session_length_in_blocks: Some(10),
-		},
+		move || versi_local_testnet_genesis(wasm_binary),
 		vec![],
 		None,
 		Some("versi"),
diff --git a/polkadot/runtime/rococo/Cargo.toml b/polkadot/runtime/rococo/Cargo.toml
index a181250cfa37..3a396b881100 100644
--- a/polkadot/runtime/rococo/Cargo.toml
+++ b/polkadot/runtime/rococo/Cargo.toml
@@ -284,6 +284,6 @@ try-runtime = [
 ]
 
 # Set timing constants (e.g. session period) to faster versions to speed up testing.
-fast-runtime = []
+fast-runtime = [ "rococo-runtime-constants/fast-runtime" ]
 
 runtime-metrics = [ "runtime-parachains/runtime-metrics", "sp-io/with-tracing" ]
diff --git a/polkadot/runtime/rococo/build.rs b/polkadot/runtime/rococo/build.rs
index e7134e0ef723..0055aabecdca 100644
--- a/polkadot/runtime/rococo/build.rs
+++ b/polkadot/runtime/rococo/build.rs
@@ -14,12 +14,22 @@
 // You should have received a copy of the GNU General Public License
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
+use std::env;
 use substrate_wasm_builder::WasmBuilder;
 
+// note: needs to be synced with rococo-runtime-constants::time hard-coded string literal in
+// prod_or_fast macro.
+const ROCOCO_EPOCH_DURATION_ENV: &str = "ROCOCO_EPOCH_DURATION";
+
 fn main() {
-	WasmBuilder::new()
-		.with_current_project()
-		.import_memory()
-		.export_heap_base()
-		.build()
+	let mut builder = WasmBuilder::new().with_current_project().import_memory().export_heap_base();
+
+	if env::var(ROCOCO_EPOCH_DURATION_ENV).is_ok() && env::var("CARGO_FEATURE_FAST_RUNTIME").is_ok()
+	{
+		builder = builder.enable_feature("fast-runtime")
+	};
+
+	builder.build();
+
+	println!("cargo:rerun-if-env-changed={}", ROCOCO_EPOCH_DURATION_ENV);
 }
diff --git a/polkadot/runtime/rococo/constants/Cargo.toml b/polkadot/runtime/rococo/constants/Cargo.toml
index b1eb3f48f655..b15fcace0fde 100644
--- a/polkadot/runtime/rococo/constants/Cargo.toml
+++ b/polkadot/runtime/rococo/constants/Cargo.toml
@@ -25,3 +25,6 @@ std = [
 	"sp-runtime/std",
 	"sp-weights/std",
 ]
+
+# Set timing constants (e.g. session period) to faster versions to speed up testing.
+fast-runtime = []
diff --git a/polkadot/runtime/rococo/constants/src/lib.rs b/polkadot/runtime/rococo/constants/src/lib.rs
index 214e2f3fa980..3b2ff696f185 100644
--- a/polkadot/runtime/rococo/constants/src/lib.rs
+++ b/polkadot/runtime/rococo/constants/src/lib.rs
@@ -41,9 +41,9 @@ pub mod time {
 	use runtime_common::prod_or_fast;
 	pub const MILLISECS_PER_BLOCK: Moment = 6000;
 	pub const SLOT_DURATION: Moment = MILLISECS_PER_BLOCK;
-	pub const DEFAULT_EPOCH_DURATION: BlockNumber = prod_or_fast!(1 * HOURS, 1 * MINUTES);
+
 	frame_support::parameter_types! {
-		pub storage EpochDurationInBlocks: BlockNumber = DEFAULT_EPOCH_DURATION;
+		pub storage EpochDurationInBlocks: BlockNumber = prod_or_fast!(1 * HOURS, 1 * MINUTES, "ROCOCO_EPOCH_DURATION");
 	}
 
 	// These time units are defined in number of blocks.
diff --git a/polkadot/zombienet_tests/functional/0002-parachains-disputes.toml b/polkadot/zombienet_tests/functional/0002-parachains-disputes.toml
index a0a87d60d4e3..e6aeb8e245c2 100644
--- a/polkadot/zombienet_tests/functional/0002-parachains-disputes.toml
+++ b/polkadot/zombienet_tests/functional/0002-parachains-disputes.toml
@@ -1,7 +1,7 @@
 [settings]
 timeout = 1000
 
-[relaychain.genesis.runtime.runtime_genesis_config.configuration.config]
+[relaychain.genesis.runtime.configuration.config]
   max_validators_per_core = 5
   needed_approvals = 8
 
diff --git a/polkadot/zombienet_tests/functional/0004-parachains-garbage-candidate.toml b/polkadot/zombienet_tests/functional/0004-parachains-garbage-candidate.toml
index 7c4f5a9f1bca..ef27d7b92f02 100644
--- a/polkadot/zombienet_tests/functional/0004-parachains-garbage-candidate.toml
+++ b/polkadot/zombienet_tests/functional/0004-parachains-garbage-candidate.toml
@@ -2,7 +2,7 @@
 timeout = 1000
 bootnode = true
 
-[relaychain.genesis.runtime.runtime_genesis_config.configuration.config]
+[relaychain.genesis.runtime.configuration.config]
   max_validators_per_core = 1
   needed_approvals = 2
 
diff --git a/polkadot/zombienet_tests/misc/0001-paritydb.toml b/polkadot/zombienet_tests/misc/0001-paritydb.toml
index 38fa56898196..99dc9c66e26e 100644
--- a/polkadot/zombienet_tests/misc/0001-paritydb.toml
+++ b/polkadot/zombienet_tests/misc/0001-paritydb.toml
@@ -2,7 +2,7 @@
 timeout = 1000
 bootnode = true
 
-[relaychain.genesis.runtime.runtime_genesis_config.configuration.config]
+[relaychain.genesis.runtime.configuration.config]
   max_validators_per_core = 1
   needed_approvals = 3
 

From a98cd78535d5d26c6adb1b36e191113d18220968 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Wed, 13 Sep 2023 16:31:05 +0200
Subject: [PATCH 02/15] build.rs fixed, CARGO_FEATURE_FAST_RUNTIME not checked

---
 polkadot/runtime/rococo/build.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/polkadot/runtime/rococo/build.rs b/polkadot/runtime/rococo/build.rs
index 0055aabecdca..6cf732fa286e 100644
--- a/polkadot/runtime/rococo/build.rs
+++ b/polkadot/runtime/rococo/build.rs
@@ -24,8 +24,7 @@ const ROCOCO_EPOCH_DURATION_ENV: &str = "ROCOCO_EPOCH_DURATION";
 fn main() {
 	let mut builder = WasmBuilder::new().with_current_project().import_memory().export_heap_base();
 
-	if env::var(ROCOCO_EPOCH_DURATION_ENV).is_ok() && env::var("CARGO_FEATURE_FAST_RUNTIME").is_ok()
-	{
+	if env::var(ROCOCO_EPOCH_DURATION_ENV).is_ok() {
 		builder = builder.enable_feature("fast-runtime")
 	};
 

From f84cd5d1e25c7c9ccd420b7d8641ee2d7249df9e Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Wed, 13 Sep 2023 16:43:06 +0200
Subject: [PATCH 03/15] build fast-runtime helper script

---
 ...build-fast-rococo-and-update-chain-spec.sh | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100755 polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh

diff --git a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
new file mode 100755
index 000000000000..e78ac318f973
--- /dev/null
+++ b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
@@ -0,0 +1,39 @@
+#!/bin/bash -eux
+
+CURRENT_DIR=$(pwd)
+
+#directory were polkadot-sdk is checked out
+POLKADOT_SDK_DIR=/home/miszka/parity/10-genesis-config/polkadot-sdk-rococo
+
+# required epoch duration:
+EPOCH_DURATION_IN_BLOCK=6
+
+# polkadot command:
+DOCKER_IMAGE=paritypr/polkadot-debug:1539-2085d3f0
+POLKADOT_CMD="docker run --rm -v $CURRENT_DIR:/dir -w /dir $DOCKER_IMAGE"
+# POLKADOT_CMD=$POLKADOT_SDK_DIR/target/release/polkadot 
+
+# path to built rococo runtime:
+WASM_RUNTIME_BLOB_PATH=$POLKADOT_SDK_DIR/target/release/wbuild/rococo-runtime/rococo_runtime.compact.compressed.wasm
+
+# build rococo runtime with adjusted epoch diration
+pushd $POLKADOT_SDK_DIR
+ROCOCO_EPOCH_DURATION=$EPOCH_DURATION_IN_BLOCK cargo build --features fast-runtime --release -p rococo-runtime
+popd
+
+# do hexdump of runtime:
+hexdump -v -e '/1 "%02x"' $WASM_RUNTIME_BLOB_PATH > ./runtime.hex
+
+# get westend spec:
+$POLKADOT_CMD build-spec --chain westend-staging  > $CURRENT_DIR/wococo-source.json
+
+# replace runtime in chainspec with newly built runtime with overwritten epoch duration:
+jq --rawfile code runtime.hex  '.genesis.runtime.system.code = "0x" + $code' > $CURRENT_DIR/chainspec-nonraw.json < $CURRENT_DIR/wococo-source.json 
+
+# jq will write numbers in compact way with 1e+18, substrtate json parser dont support it. 
+sed 's/1e+18/1000000000000000000/' -i $CURRENT_DIR/chainspec-nonraw.json
+
+# generate raw
+$POLKADOT_CMD build-spec --chain ./chainspec-nonraw.json --raw > $CURRENT_DIR/chainspec-raw.json
+
+

From 6200cc3c02d2717c58a028b41c7e2275f49d0303 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Wed, 13 Sep 2023 16:53:48 +0200
Subject: [PATCH 04/15] fixes

---
 polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
index e78ac318f973..b3f2e43a5f76 100755
--- a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
+++ b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
@@ -3,7 +3,7 @@
 CURRENT_DIR=$(pwd)
 
 #directory were polkadot-sdk is checked out
-POLKADOT_SDK_DIR=/home/miszka/parity/10-genesis-config/polkadot-sdk-rococo
+POLKADOT_SDK_DIR=$(git rev-parse --show-toplevel)
 
 # required epoch duration:
 EPOCH_DURATION_IN_BLOCK=6
@@ -35,5 +35,3 @@ sed 's/1e+18/1000000000000000000/' -i $CURRENT_DIR/chainspec-nonraw.json
 
 # generate raw
 $POLKADOT_CMD build-spec --chain ./chainspec-nonraw.json --raw > $CURRENT_DIR/chainspec-raw.json
-
-

From 5ca08c7fbea40df6c9e2a2f94b52b5c2abef99a8 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Wed, 13 Sep 2023 16:54:27 +0200
Subject: [PATCH 05/15] fixes

---
 polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
index b3f2e43a5f76..fe7ee04bb036 100755
--- a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
+++ b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
@@ -6,7 +6,7 @@ CURRENT_DIR=$(pwd)
 POLKADOT_SDK_DIR=$(git rev-parse --show-toplevel)
 
 # required epoch duration:
-EPOCH_DURATION_IN_BLOCK=6
+EPOCH_DURATION_IN_BLOCK=10
 
 # polkadot command:
 DOCKER_IMAGE=paritypr/polkadot-debug:1539-2085d3f0

From 619c85c74445f3b5f8403ae7cf9b6a176f7957b2 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Wed, 13 Sep 2023 17:28:03 +0200
Subject: [PATCH 06/15] fix

---
 polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
index fe7ee04bb036..23b15511cc53 100755
--- a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
+++ b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
@@ -6,7 +6,7 @@ CURRENT_DIR=$(pwd)
 POLKADOT_SDK_DIR=$(git rev-parse --show-toplevel)
 
 # required epoch duration:
-EPOCH_DURATION_IN_BLOCK=10
+EPOCH_DURATION_IN_BLOCKS=10
 
 # polkadot command:
 DOCKER_IMAGE=paritypr/polkadot-debug:1539-2085d3f0
@@ -18,7 +18,7 @@ WASM_RUNTIME_BLOB_PATH=$POLKADOT_SDK_DIR/target/release/wbuild/rococo-runtime/ro
 
 # build rococo runtime with adjusted epoch diration
 pushd $POLKADOT_SDK_DIR
-ROCOCO_EPOCH_DURATION=$EPOCH_DURATION_IN_BLOCK cargo build --features fast-runtime --release -p rococo-runtime
+ROCOCO_EPOCH_DURATION=$EPOCH_DURATION_IN_BLOCKS cargo build --features fast-runtime --release -p rococo-runtime
 popd
 
 # do hexdump of runtime:

From 657ae27ffd5cd853a7c83841d65ea10fd69af25c Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Wed, 13 Sep 2023 22:06:59 +0200
Subject: [PATCH 07/15] experiment: include runtimes into polkadot-debug docker
 image

---
 .gitlab/pipeline/build.yml                                   | 5 +++++
 .../dockerfiles/polkadot/polkadot_injected_debug.Dockerfile  | 5 ++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/.gitlab/pipeline/build.yml b/.gitlab/pipeline/build.yml
index c4dfc0dd0931..e9720d3f4dff 100644
--- a/.gitlab/pipeline/build.yml
+++ b/.gitlab/pipeline/build.yml
@@ -19,12 +19,17 @@ build-linux-stable:
     RUN_UI_TESTS: 1
   script:
     - time cargo build --locked --profile testnet --features pyroscope,fast-runtime --bin polkadot --bin polkadot-prepare-worker --bin polkadot-execute-worker
+    - time ROCOCO_EPOCH_DURATION=10  ./polkadot/scripts/build-only-wasm.sh rococo-runtime $(pwd)/runtimes/rococo-runtime-10/
+    - time ROCOCO_EPOCH_DURATION=100 ./polkadot/scripts/build-only-wasm.sh rococo-runtime $(pwd)/runtimes/rococo-runtime-100/
+    - pwd
+    - ls -alR runtimes
     # pack artifacts
     - mkdir -p ./artifacts
     - VERSION="${CI_COMMIT_REF_NAME}" # will be tag or branch name
     - mv ./target/testnet/polkadot ./artifacts/.
     - mv ./target/testnet/polkadot-prepare-worker ./artifacts/.
     - mv ./target/testnet/polkadot-execute-worker ./artifacts/.
+    - mv ./runtimes/ ./artifacts/.
     - pushd artifacts
     - sha256sum polkadot | tee polkadot.sha256
     - shasum -c polkadot.sha256
diff --git a/docker/dockerfiles/polkadot/polkadot_injected_debug.Dockerfile b/docker/dockerfiles/polkadot/polkadot_injected_debug.Dockerfile
index 80ce82589873..09fc4f764d04 100644
--- a/docker/dockerfiles/polkadot/polkadot_injected_debug.Dockerfile
+++ b/docker/dockerfiles/polkadot/polkadot_injected_debug.Dockerfile
@@ -28,13 +28,16 @@ RUN apt-get update && \
 	find /var/lib/apt/lists/ -type f -not -name lock -delete; \
 	# add user and link ~/.local/share/polkadot to /data
 	useradd -m -u 1000 -U -s /bin/sh -d /polkadot polkadot && \
-	mkdir -p /data /polkadot/.local/share && \
+	mkdir -p /data /polkadot/.local/share /polkdot/runtimes && \
 	chown -R polkadot:polkadot /data && \
 	ln -s /data /polkadot/.local/share/polkadot
 
 # add polkadot binaries to docker image
 COPY ./artifacts/polkadot ./artifacts/polkadot-execute-worker ./artifacts/polkadot-prepare-worker /usr/local/bin
 
+# add runtime binaries to docker image
+COPY ./artifacts/runtimes /polkadot/runtimes/
+
 USER polkadot
 
 # check if executable works in this container

From 2eddd9854de6eed9bb9c690ab8dc46eb478c8650 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Thu, 14 Sep 2023 08:48:26 +0200
Subject: [PATCH 08/15] another updated chain-spec script

---
 .../update-chain-spec-with-fast-rococo.sh     | 63 +++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100755 polkadot/scripts/update-chain-spec-with-fast-rococo.sh

diff --git a/polkadot/scripts/update-chain-spec-with-fast-rococo.sh b/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
new file mode 100755
index 000000000000..8bbb66c15a8a
--- /dev/null
+++ b/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
@@ -0,0 +1,63 @@
+#!/bin/bash -eu
+
+CURRENT_DIR=$(pwd)
+
+usage() {
+  echo "usage $0 docker-image epoch-duration [options]"
+  echo " -c chain-name - base chain-spec to be used [default: westend-staging)"
+  exit -1
+}
+
+if [ "$#" -lt 2 ]; then
+  usage
+fi
+
+# docker image to be used
+DOCKER_IMAGE=$1
+EPOCH_DURATION_IN_BLOCKS=$2
+
+shift 2
+
+CHAIN_NAME="westend-staging"
+
+while getopts "x" o; do
+    case "${o}" in
+        c)
+            CHAIN_NAME=${OPTARG}
+            ;;
+        *)
+            usage
+            ;;
+    esac
+done
+
+if [ -z $DOCKER_IMAGE ]; then
+  usage
+fi
+
+OUTPUT_ROOT_DIR=exported-runtimes/
+
+# polkadot command:
+POLKADOT_CMD="docker run --rm -v $CURRENT_DIR:/dir -w /dir $DOCKER_IMAGE"
+
+# extract rococo runtime with adjusted epoch diration from docker image
+docker export $(docker create $DOCKER_IMAGE) | \
+  tar --transform="s|polkadot/runtimes/|$OUTPUT_ROOT_DIR/|" -xf - polkadot/runtimes/rococo-runtime-$EPOCH_DURATION_IN_BLOCKS/rococo_runtime.wasm
+
+# path to extracted rococo runtime:
+WASM_RUNTIME_BLOB_PATH=$OUTPUT_ROOT_DIR/rococo-runtime-$EPOCH_DURATION_IN_BLOCKS/rococo_runtime.wasm
+
+# do hexdump of runtime:
+hexdump -v -e '/1 "%02x"' $WASM_RUNTIME_BLOB_PATH > $WASM_RUNTIME_BLOB_PATH.hex
+
+# get westend spec:
+$POLKADOT_CMD build-spec --chain $CHAIN_NAME > $CURRENT_DIR/wococo-source.json
+
+# replace runtime in chainspec with newly built runtime with overwritten epoch duration:
+jq --rawfile code $WASM_RUNTIME_BLOB_PATH.hex '.genesis.runtime.system.code = "0x" + $code' > $CURRENT_DIR/chainspec-nonraw.json < $CURRENT_DIR/wococo-source.json 
+
+# jq will write numbers in compact way with 1e+18, substrtate json parser dont support it. 
+sed 's/1e+18/1000000000000000000/' -i $CURRENT_DIR/chainspec-nonraw.json
+
+# generate raw
+$POLKADOT_CMD build-spec --chain ./chainspec-nonraw.json --raw > $CURRENT_DIR/chainspec-raw.json

From e87df131b061e16728c1333b91f109fe27451ce5 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Thu, 14 Sep 2023 10:41:51 +0200
Subject: [PATCH 09/15] fix + prod rococo-runtime (600)

---
 .gitlab/pipeline/build.yml                             | 1 +
 polkadot/scripts/update-chain-spec-with-fast-rococo.sh | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/.gitlab/pipeline/build.yml b/.gitlab/pipeline/build.yml
index e9720d3f4dff..889535ab289d 100644
--- a/.gitlab/pipeline/build.yml
+++ b/.gitlab/pipeline/build.yml
@@ -21,6 +21,7 @@ build-linux-stable:
     - time cargo build --locked --profile testnet --features pyroscope,fast-runtime --bin polkadot --bin polkadot-prepare-worker --bin polkadot-execute-worker
     - time ROCOCO_EPOCH_DURATION=10  ./polkadot/scripts/build-only-wasm.sh rococo-runtime $(pwd)/runtimes/rococo-runtime-10/
     - time ROCOCO_EPOCH_DURATION=100 ./polkadot/scripts/build-only-wasm.sh rococo-runtime $(pwd)/runtimes/rococo-runtime-100/
+    - time ./polkadot/scripts/build-only-wasm.sh rococo-runtime $(pwd)/runtimes/rococo-runtime-600/
     - pwd
     - ls -alR runtimes
     # pack artifacts
diff --git a/polkadot/scripts/update-chain-spec-with-fast-rococo.sh b/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
index 8bbb66c15a8a..1515fa550e56 100755
--- a/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
+++ b/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
@@ -20,7 +20,7 @@ shift 2
 
 CHAIN_NAME="westend-staging"
 
-while getopts "x" o; do
+while getopts "c:" o; do
     case "${o}" in
         c)
             CHAIN_NAME=${OPTARG}

From 138db76ee2e9dbe0200ba7ac0785e5135c6f83ac Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Tue, 26 Sep 2023 15:47:27 +0200
Subject: [PATCH 10/15] Apply suggestions from code review
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: Bastian Köcher <git@kchr.de>
---
 polkadot/runtime/rococo/build.rs                            | 4 ++++
 polkadot/runtime/rococo/constants/src/lib.rs                | 2 +-
 polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh | 2 +-
 polkadot/scripts/update-chain-spec-with-fast-rococo.sh      | 2 +-
 4 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/polkadot/runtime/rococo/build.rs b/polkadot/runtime/rococo/build.rs
index 6cf732fa286e..8b2e8e8a439b 100644
--- a/polkadot/runtime/rococo/build.rs
+++ b/polkadot/runtime/rococo/build.rs
@@ -21,6 +21,7 @@ use substrate_wasm_builder::WasmBuilder;
 // prod_or_fast macro.
 const ROCOCO_EPOCH_DURATION_ENV: &str = "ROCOCO_EPOCH_DURATION";
 
+[cfg(feature = "std")]
 fn main() {
 	let mut builder = WasmBuilder::new().with_current_project().import_memory().export_heap_base();
 
@@ -32,3 +33,6 @@ fn main() {
 
 	println!("cargo:rerun-if-env-changed={}", ROCOCO_EPOCH_DURATION_ENV);
 }
+
+#[cfg(not(feature = "std"))]
+fn main() {}
diff --git a/polkadot/runtime/rococo/constants/src/lib.rs b/polkadot/runtime/rococo/constants/src/lib.rs
index 3b2ff696f185..21fa6bb2f1f2 100644
--- a/polkadot/runtime/rococo/constants/src/lib.rs
+++ b/polkadot/runtime/rococo/constants/src/lib.rs
@@ -43,7 +43,7 @@ pub mod time {
 	pub const SLOT_DURATION: Moment = MILLISECS_PER_BLOCK;
 
 	frame_support::parameter_types! {
-		pub storage EpochDurationInBlocks: BlockNumber = prod_or_fast!(1 * HOURS, 1 * MINUTES, "ROCOCO_EPOCH_DURATION");
+		pub storage EpochDurationInBlocks: BlockNumber = option_env!("ROCOCO_EPOCH_DURATION").map(|s| s.parse().expect("`ROCOCO_EPOCH_DURATION` is not a valid `BlockNumber`")).unwrap_or(1 * MINUTES);
 	}
 
 	// These time units are defined in number of blocks.
diff --git a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
index 23b15511cc53..18bff45d6dce 100755
--- a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
+++ b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
@@ -1,4 +1,4 @@
-#!/bin/bash -eux
+#!/usr/bin/env bash -eux
 
 CURRENT_DIR=$(pwd)
 
diff --git a/polkadot/scripts/update-chain-spec-with-fast-rococo.sh b/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
index 1515fa550e56..26df4b88eada 100755
--- a/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
+++ b/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
@@ -1,4 +1,4 @@
-#!/bin/bash -eu
+#!/usr/bin/env bash -eu
 
 CURRENT_DIR=$(pwd)
 

From d55ae688a8d0769966a125fde2f0dd6cc7f8e762 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Tue, 26 Sep 2023 15:57:11 +0200
Subject: [PATCH 11/15] review comments applied + script removed

---
 polkadot/runtime/rococo/Cargo.toml            |  3 +-
 polkadot/runtime/rococo/build.rs              |  3 +-
 polkadot/runtime/rococo/constants/src/lib.rs  |  5 ++-
 ...build-fast-rococo-and-update-chain-spec.sh | 37 -------------------
 .../update-chain-spec-with-fast-rococo.sh     |  7 +++-
 5 files changed, 12 insertions(+), 43 deletions(-)
 delete mode 100755 polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh

diff --git a/polkadot/runtime/rococo/Cargo.toml b/polkadot/runtime/rococo/Cargo.toml
index 2359d80a5d67..64278a762d89 100644
--- a/polkadot/runtime/rococo/Cargo.toml
+++ b/polkadot/runtime/rococo/Cargo.toml
@@ -104,7 +104,7 @@ sp-tracing = { path = "../../../substrate/primitives/tracing", default-features
 tokio = { version = "1.24.2", features = ["macros"] }
 
 [build-dependencies]
-substrate-wasm-builder = { path = "../../../substrate/utils/wasm-builder" }
+substrate-wasm-builder = { path = "../../../substrate/utils/wasm-builder", optional = true }
 
 [features]
 default = [ "std" ]
@@ -184,6 +184,7 @@ std = [
 	"sp-storage/std",
 	"sp-tracing/std",
 	"sp-version/std",
+	"substrate-wasm-builder",
 	"tx-pool-api/std",
 	"xcm-builder/std",
 	"xcm-executor/std",
diff --git a/polkadot/runtime/rococo/build.rs b/polkadot/runtime/rococo/build.rs
index 8b2e8e8a439b..36352c5e883a 100644
--- a/polkadot/runtime/rococo/build.rs
+++ b/polkadot/runtime/rococo/build.rs
@@ -15,13 +15,14 @@
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
 use std::env;
+#[cfg(feature = "std")]
 use substrate_wasm_builder::WasmBuilder;
 
 // note: needs to be synced with rococo-runtime-constants::time hard-coded string literal in
 // prod_or_fast macro.
 const ROCOCO_EPOCH_DURATION_ENV: &str = "ROCOCO_EPOCH_DURATION";
 
-[cfg(feature = "std")]
+#[cfg(feature = "std")]
 fn main() {
 	let mut builder = WasmBuilder::new().with_current_project().import_memory().export_heap_base();
 
diff --git a/polkadot/runtime/rococo/constants/src/lib.rs b/polkadot/runtime/rococo/constants/src/lib.rs
index 21fa6bb2f1f2..2200f7ddefe1 100644
--- a/polkadot/runtime/rococo/constants/src/lib.rs
+++ b/polkadot/runtime/rococo/constants/src/lib.rs
@@ -38,12 +38,13 @@ pub mod currency {
 /// Time and blocks.
 pub mod time {
 	use primitives::{BlockNumber, Moment};
-	use runtime_common::prod_or_fast;
 	pub const MILLISECS_PER_BLOCK: Moment = 6000;
 	pub const SLOT_DURATION: Moment = MILLISECS_PER_BLOCK;
 
 	frame_support::parameter_types! {
-		pub storage EpochDurationInBlocks: BlockNumber = option_env!("ROCOCO_EPOCH_DURATION").map(|s| s.parse().expect("`ROCOCO_EPOCH_DURATION` is not a valid `BlockNumber`")).unwrap_or(1 * MINUTES);
+		pub storage EpochDurationInBlocks: BlockNumber = option_env!("ROCOCO_EPOCH_DURATION")
+			.map(|s| s.parse().expect("`ROCOCO_EPOCH_DURATION` is not a valid `BlockNumber`"))
+			.unwrap_or(1 * MINUTES);
 	}
 
 	// These time units are defined in number of blocks.
diff --git a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh b/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
deleted file mode 100755
index 18bff45d6dce..000000000000
--- a/polkadot/scripts/build-fast-rococo-and-update-chain-spec.sh
+++ /dev/null
@@ -1,37 +0,0 @@
-#!/usr/bin/env bash -eux
-
-CURRENT_DIR=$(pwd)
-
-#directory were polkadot-sdk is checked out
-POLKADOT_SDK_DIR=$(git rev-parse --show-toplevel)
-
-# required epoch duration:
-EPOCH_DURATION_IN_BLOCKS=10
-
-# polkadot command:
-DOCKER_IMAGE=paritypr/polkadot-debug:1539-2085d3f0
-POLKADOT_CMD="docker run --rm -v $CURRENT_DIR:/dir -w /dir $DOCKER_IMAGE"
-# POLKADOT_CMD=$POLKADOT_SDK_DIR/target/release/polkadot 
-
-# path to built rococo runtime:
-WASM_RUNTIME_BLOB_PATH=$POLKADOT_SDK_DIR/target/release/wbuild/rococo-runtime/rococo_runtime.compact.compressed.wasm
-
-# build rococo runtime with adjusted epoch diration
-pushd $POLKADOT_SDK_DIR
-ROCOCO_EPOCH_DURATION=$EPOCH_DURATION_IN_BLOCKS cargo build --features fast-runtime --release -p rococo-runtime
-popd
-
-# do hexdump of runtime:
-hexdump -v -e '/1 "%02x"' $WASM_RUNTIME_BLOB_PATH > ./runtime.hex
-
-# get westend spec:
-$POLKADOT_CMD build-spec --chain westend-staging  > $CURRENT_DIR/wococo-source.json
-
-# replace runtime in chainspec with newly built runtime with overwritten epoch duration:
-jq --rawfile code runtime.hex  '.genesis.runtime.system.code = "0x" + $code' > $CURRENT_DIR/chainspec-nonraw.json < $CURRENT_DIR/wococo-source.json 
-
-# jq will write numbers in compact way with 1e+18, substrtate json parser dont support it. 
-sed 's/1e+18/1000000000000000000/' -i $CURRENT_DIR/chainspec-nonraw.json
-
-# generate raw
-$POLKADOT_CMD build-spec --chain ./chainspec-nonraw.json --raw > $CURRENT_DIR/chainspec-raw.json
diff --git a/polkadot/scripts/update-chain-spec-with-fast-rococo.sh b/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
index 26df4b88eada..12904b85f5f0 100755
--- a/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
+++ b/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash -eu
 
+# Sample script showing how to update the chain-spec 'code' field with the pre-built rococo runtime blob with
+# non-standard epoch duration.
+
 CURRENT_DIR=$(pwd)
 
 usage() {
@@ -51,10 +54,10 @@ WASM_RUNTIME_BLOB_PATH=$OUTPUT_ROOT_DIR/rococo-runtime-$EPOCH_DURATION_IN_BLOCKS
 hexdump -v -e '/1 "%02x"' $WASM_RUNTIME_BLOB_PATH > $WASM_RUNTIME_BLOB_PATH.hex
 
 # get westend spec:
-$POLKADOT_CMD build-spec --chain $CHAIN_NAME > $CURRENT_DIR/wococo-source.json
+$POLKADOT_CMD build-spec --chain $CHAIN_NAME > $CURRENT_DIR/chainspec-source.json
 
 # replace runtime in chainspec with newly built runtime with overwritten epoch duration:
-jq --rawfile code $WASM_RUNTIME_BLOB_PATH.hex '.genesis.runtime.system.code = "0x" + $code' > $CURRENT_DIR/chainspec-nonraw.json < $CURRENT_DIR/wococo-source.json 
+jq --rawfile code $WASM_RUNTIME_BLOB_PATH.hex '.genesis.runtime.system.code = "0x" + $code' > $CURRENT_DIR/chainspec-nonraw.json < $CURRENT_DIR/chainspec-source.json 
 
 # jq will write numbers in compact way with 1e+18, substrtate json parser dont support it. 
 sed 's/1e+18/1000000000000000000/' -i $CURRENT_DIR/chainspec-nonraw.json

From f2fd3ae6126a24186b66b82272fb9183c7ce2542 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Tue, 26 Sep 2023 16:20:04 +0200
Subject: [PATCH 12/15] fixes + readme improved

---
 .gitlab/pipeline/build.yml        | 2 +-
 polkadot/runtime/rococo/README.md | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/.gitlab/pipeline/build.yml b/.gitlab/pipeline/build.yml
index d993e6202bb1..029c0f6a3cdd 100644
--- a/.gitlab/pipeline/build.yml
+++ b/.gitlab/pipeline/build.yml
@@ -21,7 +21,7 @@ build-linux-stable:
     - time cargo build --locked --profile testnet --features pyroscope,fast-runtime --bin polkadot --bin polkadot-prepare-worker --bin polkadot-execute-worker
     - time ROCOCO_EPOCH_DURATION=10  ./polkadot/scripts/build-only-wasm.sh rococo-runtime $(pwd)/runtimes/rococo-runtime-10/
     - time ROCOCO_EPOCH_DURATION=100 ./polkadot/scripts/build-only-wasm.sh rococo-runtime $(pwd)/runtimes/rococo-runtime-100/
-    - time ./polkadot/scripts/build-only-wasm.sh rococo-runtime $(pwd)/runtimes/rococo-runtime-600/
+    - time ROCOCO_EPOCH_DURATION=600 ./polkadot/scripts/build-only-wasm.sh rococo-runtime $(pwd)/runtimes/rococo-runtime-600/
     - pwd
     - ls -alR runtimes
     # pack artifacts
diff --git a/polkadot/runtime/rococo/README.md b/polkadot/runtime/rococo/README.md
index 465afd25549b..502359a2acbc 100644
--- a/polkadot/runtime/rococo/README.md
+++ b/polkadot/runtime/rococo/README.md
@@ -2,6 +2,13 @@
 
 Rococo is a testnet runtime with no stability guarantees.
 
+## How to build `rococo` runtime
+`EpochDurationInBlocks` parameter is configurable via `ROCOCO_EPOCH_DURATION` environment variable. To build wasm
+runtime blob with customized epoch duration run following command shall be exectuted:
+```bash
+ROCOCO_EPOCH_DURATION=10 ./polkadot/scripts/build-only-wasm.sh rococo-runtime /path/to/output/directory/
+```
+
 ## How to run `rococo-local`
 
 The [Cumulus Tutorial](https://docs.substrate.io/tutorials/v3/cumulus/start-relay/) details building, starting, and

From e240385c5a0859176a669b77bd31e47506eaa684 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Tue, 26 Sep 2023 16:46:04 +0200
Subject: [PATCH 13/15] fast-rutnime removed from rococo-constants

---
 polkadot/runtime/rococo/Cargo.toml           |  2 +-
 polkadot/runtime/rococo/README.md            |  2 +-
 polkadot/runtime/rococo/build.rs             | 13 +++++--------
 polkadot/runtime/rococo/constants/Cargo.toml |  3 ---
 4 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/polkadot/runtime/rococo/Cargo.toml b/polkadot/runtime/rococo/Cargo.toml
index 64278a762d89..64bd8c6b2b50 100644
--- a/polkadot/runtime/rococo/Cargo.toml
+++ b/polkadot/runtime/rococo/Cargo.toml
@@ -285,6 +285,6 @@ try-runtime = [
 ]
 
 # Set timing constants (e.g. session period) to faster versions to speed up testing.
-fast-runtime = [ "rococo-runtime-constants/fast-runtime" ]
+fast-runtime = [ ]
 
 runtime-metrics = [ "runtime-parachains/runtime-metrics", "sp-io/with-tracing" ]
diff --git a/polkadot/runtime/rococo/README.md b/polkadot/runtime/rococo/README.md
index 502359a2acbc..5b2c296f0ced 100644
--- a/polkadot/runtime/rococo/README.md
+++ b/polkadot/runtime/rococo/README.md
@@ -4,7 +4,7 @@ Rococo is a testnet runtime with no stability guarantees.
 
 ## How to build `rococo` runtime
 `EpochDurationInBlocks` parameter is configurable via `ROCOCO_EPOCH_DURATION` environment variable. To build wasm
-runtime blob with customized epoch duration run following command shall be exectuted:
+runtime blob with customized epoch duration the following command shall be exectuted:
 ```bash
 ROCOCO_EPOCH_DURATION=10 ./polkadot/scripts/build-only-wasm.sh rococo-runtime /path/to/output/directory/
 ```
diff --git a/polkadot/runtime/rococo/build.rs b/polkadot/runtime/rococo/build.rs
index 36352c5e883a..88a872507490 100644
--- a/polkadot/runtime/rococo/build.rs
+++ b/polkadot/runtime/rococo/build.rs
@@ -14,7 +14,6 @@
 // You should have received a copy of the GNU General Public License
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
-use std::env;
 #[cfg(feature = "std")]
 use substrate_wasm_builder::WasmBuilder;
 
@@ -24,13 +23,11 @@ const ROCOCO_EPOCH_DURATION_ENV: &str = "ROCOCO_EPOCH_DURATION";
 
 #[cfg(feature = "std")]
 fn main() {
-	let mut builder = WasmBuilder::new().with_current_project().import_memory().export_heap_base();
-
-	if env::var(ROCOCO_EPOCH_DURATION_ENV).is_ok() {
-		builder = builder.enable_feature("fast-runtime")
-	};
-
-	builder.build();
+	WasmBuilder::new()
+		.with_current_project()
+		.import_memory()
+		.export_heap_base()
+		.build();
 
 	println!("cargo:rerun-if-env-changed={}", ROCOCO_EPOCH_DURATION_ENV);
 }
diff --git a/polkadot/runtime/rococo/constants/Cargo.toml b/polkadot/runtime/rococo/constants/Cargo.toml
index b15fcace0fde..b1eb3f48f655 100644
--- a/polkadot/runtime/rococo/constants/Cargo.toml
+++ b/polkadot/runtime/rococo/constants/Cargo.toml
@@ -25,6 +25,3 @@ std = [
 	"sp-runtime/std",
 	"sp-weights/std",
 ]
-
-# Set timing constants (e.g. session period) to faster versions to speed up testing.
-fast-runtime = []

From c4e26b2ef242699f3b3b0b31821a9c7ac6a6d331 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Tue, 26 Sep 2023 18:05:43 +0200
Subject: [PATCH 14/15] fixes

---
 polkadot/runtime/rococo/Cargo.toml |  2 +-
 polkadot/runtime/rococo/build.rs   | 12 ++++--------
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/polkadot/runtime/rococo/Cargo.toml b/polkadot/runtime/rococo/Cargo.toml
index 64bd8c6b2b50..80f8339a9976 100644
--- a/polkadot/runtime/rococo/Cargo.toml
+++ b/polkadot/runtime/rococo/Cargo.toml
@@ -285,6 +285,6 @@ try-runtime = [
 ]
 
 # Set timing constants (e.g. session period) to faster versions to speed up testing.
-fast-runtime = [ ]
+fast-runtime = []
 
 runtime-metrics = [ "runtime-parachains/runtime-metrics", "sp-io/with-tracing" ]
diff --git a/polkadot/runtime/rococo/build.rs b/polkadot/runtime/rococo/build.rs
index 88a872507490..ed32d33105b7 100644
--- a/polkadot/runtime/rococo/build.rs
+++ b/polkadot/runtime/rococo/build.rs
@@ -14,16 +14,12 @@
 // You should have received a copy of the GNU General Public License
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
-#[cfg(feature = "std")]
-use substrate_wasm_builder::WasmBuilder;
-
-// note: needs to be synced with rococo-runtime-constants::time hard-coded string literal in
-// prod_or_fast macro.
-const ROCOCO_EPOCH_DURATION_ENV: &str = "ROCOCO_EPOCH_DURATION";
-
 #[cfg(feature = "std")]
 fn main() {
-	WasmBuilder::new()
+	// note: needs to be synced with rococo-runtime-constants::time hard-coded string literal
+	const ROCOCO_EPOCH_DURATION_ENV: &str = "ROCOCO_EPOCH_DURATION";
+
+	substrate_wasm_builder::WasmBuilder::new()
 		.with_current_project()
 		.import_memory()
 		.export_heap_base()

From 43257373908a53c1755a69f82410830235c36807 Mon Sep 17 00:00:00 2001
From: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Date: Wed, 27 Sep 2023 16:55:35 +0200
Subject: [PATCH 15/15] update-chain-spec-with-fast-rococo.sh removed

This script will leave in different repository.
---
 .../update-chain-spec-with-fast-rococo.sh     | 66 -------------------
 1 file changed, 66 deletions(-)
 delete mode 100755 polkadot/scripts/update-chain-spec-with-fast-rococo.sh

diff --git a/polkadot/scripts/update-chain-spec-with-fast-rococo.sh b/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
deleted file mode 100755
index 12904b85f5f0..000000000000
--- a/polkadot/scripts/update-chain-spec-with-fast-rococo.sh
+++ /dev/null
@@ -1,66 +0,0 @@
-#!/usr/bin/env bash -eu
-
-# Sample script showing how to update the chain-spec 'code' field with the pre-built rococo runtime blob with
-# non-standard epoch duration.
-
-CURRENT_DIR=$(pwd)
-
-usage() {
-  echo "usage $0 docker-image epoch-duration [options]"
-  echo " -c chain-name - base chain-spec to be used [default: westend-staging)"
-  exit -1
-}
-
-if [ "$#" -lt 2 ]; then
-  usage
-fi
-
-# docker image to be used
-DOCKER_IMAGE=$1
-EPOCH_DURATION_IN_BLOCKS=$2
-
-shift 2
-
-CHAIN_NAME="westend-staging"
-
-while getopts "c:" o; do
-    case "${o}" in
-        c)
-            CHAIN_NAME=${OPTARG}
-            ;;
-        *)
-            usage
-            ;;
-    esac
-done
-
-if [ -z $DOCKER_IMAGE ]; then
-  usage
-fi
-
-OUTPUT_ROOT_DIR=exported-runtimes/
-
-# polkadot command:
-POLKADOT_CMD="docker run --rm -v $CURRENT_DIR:/dir -w /dir $DOCKER_IMAGE"
-
-# extract rococo runtime with adjusted epoch diration from docker image
-docker export $(docker create $DOCKER_IMAGE) | \
-  tar --transform="s|polkadot/runtimes/|$OUTPUT_ROOT_DIR/|" -xf - polkadot/runtimes/rococo-runtime-$EPOCH_DURATION_IN_BLOCKS/rococo_runtime.wasm
-
-# path to extracted rococo runtime:
-WASM_RUNTIME_BLOB_PATH=$OUTPUT_ROOT_DIR/rococo-runtime-$EPOCH_DURATION_IN_BLOCKS/rococo_runtime.wasm
-
-# do hexdump of runtime:
-hexdump -v -e '/1 "%02x"' $WASM_RUNTIME_BLOB_PATH > $WASM_RUNTIME_BLOB_PATH.hex
-
-# get westend spec:
-$POLKADOT_CMD build-spec --chain $CHAIN_NAME > $CURRENT_DIR/chainspec-source.json
-
-# replace runtime in chainspec with newly built runtime with overwritten epoch duration:
-jq --rawfile code $WASM_RUNTIME_BLOB_PATH.hex '.genesis.runtime.system.code = "0x" + $code' > $CURRENT_DIR/chainspec-nonraw.json < $CURRENT_DIR/chainspec-source.json 
-
-# jq will write numbers in compact way with 1e+18, substrtate json parser dont support it. 
-sed 's/1e+18/1000000000000000000/' -i $CURRENT_DIR/chainspec-nonraw.json
-
-# generate raw
-$POLKADOT_CMD build-spec --chain ./chainspec-nonraw.json --raw > $CURRENT_DIR/chainspec-raw.json