Use custom bpf-tools (#319)

* Use custom bpf-tools

* Source rustup

* Typos

* Fix CI

Author: guibescos

docker/Dockerfile

@@ -60,7 +60,7 @@ COPY --chown=pyth:pyth . pyth-client/
 # Build off-chain binaries.
 RUN cd pyth-client && ./scripts/build.sh
 
-
+RUN ./pyth-client/scripts/get-bpf-tools.sh
 # Copy solana sdk and apply patch.
 RUN mkdir solana
 RUN cp -a /usr/bin/sdk solana

scripts/get-bpf-tools.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+#
+# The goal of this script is downloading our own version of bpf/sbf tools. When cargo-build-bpf/sbf gets called
+# https://github.com/solana-labs/sbf-tools/releases/download/v1.29/solana-bpf-tools-linux.tar.bz2 gets downloaded, extracted and linked as a toolchain.
+# This script is meant to override that behavior and use another version of bpf/sbf-tools.
+# Using a custom version of bpf/sbf-tools allows our use of -Z build-std=std,panic_abort flags that make the binary smaller. These flags compile the std library from scratch.
+# If solana fixes bpf/sbf-tools, we can revert back to the default behavior (once this PR https://github.com/solana-labs/cargo/pull/1 gets merged and released)
+set -eux
+
+curl https://github.com/guibescos/sbf-tools/releases/download/v1.29.1/solana-bpf-tools-linux.tar.bz2 --output solana-bpf-tools-linux.tar.bz2 -L
+mkdir -p ~/.cache/solana/v1.29/bpf-tools/
+tar -xf solana-bpf-tools-linux.tar.bz2 -C ~/.cache/solana/v1.29/bpf-tools/
+rm solana-bpf-tools-linux.tar.bz2
+
+# Source cargo
+if ! which cargo 2> /dev/null
+then
+  # shellcheck disable=SC1090
+  source "${CARGO_HOME:-$HOME/.cargo}/env"
+fi
+
+# Link the toolchain for future use
+rustup toolchain link bpf ~/.cache/solana/v1.29/bpf-tools/rust