Manually download bitcoind/electrs for CI tests

Previously, we used the auto-download feature of the
`electrsd`/`bitcoind` crates. While convenient, they unnecessarily
introduced a lot of dependecies (`zip`, `zstd`, `time`, etc.) to our
test environment which needed pinning for the MSRV of 1.63.

Here, we introduce a new `no_download` config flag to the
`lightning-transaction-sync` crate allowing us to disable this
auto-download feature in CI, where we now opt to download the
corresponding binaries manually. We keep the default-auto-download as a
convenience feature for running tests locally though.

Author: tnull

ci/ci-tests.sh

@@ -11,6 +11,50 @@ function PIN_RELEASE_DEPS {
 	return 0 # Don't fail the script if our rustc is higher than the last check
 }
 
+# The tests of `lightning-transaction-sync` require `electrs` and `bitcoind`
+# binaries. Here, we download the binaries, validate them, and export their
+# location via `ELECTRS_EXE`/`BITCOIND_EXE` which will be used by
+# `electrsd`/`bitcoind` crates in our tests.
+function DOWNLOAD_ELECTRS_AND_BITCOIND {
+	ELECTRS_DL_ENDPOINT="https://github.com/RCasatta/electrsd/releases/download/electrs_releases"
+	ELECTRS_VERSION="esplora_a33e97e1a1fc63fa9c20a116bb92579bbf43b254"
+	BITCOIND_DL_ENDPOINT="https://bitcoincore.org/bin/"
+	BITCOIND_VERSION="25.1"
+	if [[ "$HOST_PLATFORM" == *linux* ]]; then
+		ELECTRS_DL_FILE_NAME=electrs_linux_"$ELECTRS_VERSION".zip
+		ELECTRS_DL_HASH="865e26a96e8df77df01d96f2f569dcf9622fc87a8d99a9b8fe30861a4db9ddf1"
+		BITCOIND_DL_FILE_NAME=bitcoin-"$BITCOIND_VERSION"-x86_64-linux-gnu.tar.gz
+		BITCOIND_DL_HASH="a978c407b497a727f0444156e397b50491ce862d1f906fef9b521415b3611c8b"
+	elif [[ "$HOST_PLATFORM" == *darwin* ]]; then
+		ELECTRS_DL_FILE_NAME=electrs_macos_"$ELECTRS_VERSION".zip
+		ELECTRS_DL_HASH="2d5ff149e8a2482d3658e9b386830dfc40c8fbd7c175ca7cbac58240a9505bcd"
+		BITCOIND_DL_FILE_NAME=bitcoin-"$BITCOIND_VERSION"-x86_64-apple-darwin.tar.gz
+		BITCOIND_DL_HASH="1acfde0ec3128381b83e3e5f54d1c7907871d324549129592144dd12a821eff1"
+	else
+		echo -e "\n\nUnsupported platform. Exiting.."
+		exit 1
+	fi
+
+	DL_TMP_DIR=$(mktemp -d)
+	trap 'rm -rf -- "$DL_TMP_DIR"' EXIT
+
+	pushd "$DL_TMP_DIR"
+	ELECTRS_DL_URL="$ELECTRS_DL_ENDPOINT"/"$ELECTRS_DL_FILE_NAME"
+	curl -L -o "$ELECTRS_DL_FILE_NAME" "$ELECTRS_DL_URL"
+	echo "$ELECTRS_DL_HASH  $ELECTRS_DL_FILE_NAME"|shasum -a 256 -c
+	unzip "$ELECTRS_DL_FILE_NAME"
+	export ELECTRS_EXE="$DL_TMP_DIR"/electrs
+	chmod +x "$ELECTRS_EXE"
+
+	BITCOIND_DL_URL="$BITCOIND_DL_ENDPOINT"/bitcoin-core-"$BITCOIND_VERSION"/"$BITCOIND_DL_FILE_NAME"
+	curl -L -o "$BITCOIND_DL_FILE_NAME" "$BITCOIND_DL_URL"
+	echo "$BITCOIND_DL_HASH  $BITCOIND_DL_FILE_NAME"|shasum -a 256 -c
+	tar xzf "$BITCOIND_DL_FILE_NAME"
+	export BITCOIND_EXE="$DL_TMP_DIR"/bitcoin-"$BITCOIND_VERSION"/bin/bitcoind
+	chmod +x "$BITCOIND_EXE"
+	popd
+}
+
 PIN_RELEASE_DEPS # pin the release dependencies in our main workspace
 
 # Starting with version 1.10.0, the `regex` crate has an MSRV of rustc 1.65.0.
@@ -41,23 +85,21 @@ if [[ "$HOST_PLATFORM" != *windows* ]]; then
 	echo -e "\n\nBuilding and testing Transaction Sync Clients with features"
 	pushd lightning-transaction-sync
 
-	# zstd-sys 2.0.9+zstd.1.5.5 requires rustc 1.64.0
-	[ "$RUSTC_MINOR_VERSION" -lt 64 ] && cargo update -p zstd-sys --precise "2.0.8+zstd.1.5.5" --verbose
 	# reqwest 0.11.21 had a regression that broke its 1.63.0 MSRV
 	[ "$RUSTC_MINOR_VERSION" -lt 65 ] && cargo update -p reqwest --precise "0.11.20" --verbose
-	# jobserver 0.1.27 requires rustc 1.66.0
-	[ "$RUSTC_MINOR_VERSION" -lt 66 ] && cargo update -p jobserver --precise "0.1.26" --verbose
 	# Starting with version 1.10.0, the `regex` crate has an MSRV of rustc 1.65.0.
 	[ "$RUSTC_MINOR_VERSION" -lt 65 ] && cargo update -p regex --precise "1.9.6" --verbose
 
-	cargo test --verbose --color always --features esplora-blocking
-	cargo check --verbose --color always --features esplora-blocking
-	cargo test --verbose --color always --features esplora-async
-	cargo check --verbose --color always --features esplora-async
-	cargo test --verbose --color always --features esplora-async-https
-	cargo check --verbose --color always --features esplora-async-https
-	cargo test --verbose --color always --features electrum
-	cargo check --verbose --color always --features electrum
+	DOWNLOAD_ELECTRS_AND_BITCOIND
+
+	RUSTFLAGS="--cfg no_download" cargo test --verbose --color always --features esplora-blocking
+	RUSTFLAGS="--cfg no_download" cargo check --verbose --color always --features esplora-blocking
+	RUSTFLAGS="--cfg no_download" cargo test --verbose --color always --features esplora-async
+	RUSTFLAGS="--cfg no_download" cargo check --verbose --color always --features esplora-async
+	RUSTFLAGS="--cfg no_download" cargo test --verbose --color always --features esplora-async-https
+	RUSTFLAGS="--cfg no_download" cargo check --verbose --color always --features esplora-async-https
+	RUSTFLAGS="--cfg no_download" cargo test --verbose --color always --features electrum
+	RUSTFLAGS="--cfg no_download" cargo check --verbose --color always --features electrum
 
 	popd
 fi

lightning-transaction-sync/Cargo.toml

@@ -31,5 +31,10 @@ electrum-client = { version = "0.18.0", optional = true }
 
 [dev-dependencies]
 lightning = { version = "0.0.118", path = "../lightning", default-features = false, features = ["std", "_test_utils"] }
-electrsd = { version = "0.26.0", features = ["legacy", "esplora_a33e97e1", "bitcoind_25_0"] }
 tokio = { version = "1.14.0", features = ["full"] }
+
+[target.'cfg(not(no_download))'.dev-dependencies]
+electrsd = { version = "0.26.0", default-features = false, features = ["legacy", "esplora_a33e97e1", "bitcoind_25_0"] }
+
+[target.'cfg(no_download)'.dev-dependencies]
+electrsd = { version = "0.26.0", default-features = false, features = ["legacy"] }