enable logging in loaders

programs/native/bpf_loader/Cargo.toml

@@ -7,6 +7,7 @@ authors = ["Solana Maintainers <maintainers@solana.com>"]
 bincode = "1.0.0"
 byteorder = "1.2.1"
 elf = "0.0.10"
+env_logger = "0.5.12"
 libc = "0.2.43"
 log = "0.4.2"
 rbpf = { git = "https://github.com/qmonnet/rbpf", rev="bc41ec47d9b51751585f6ddcde1d1eb1afe2be69" }

programs/native/bpf_loader/src/lib.rs

@@ -1,15 +1,16 @@
+pub mod bpf_verifier;
+
 extern crate bincode;
 extern crate byteorder;
 extern crate elf;
+extern crate env_logger;
 extern crate libc;
-extern crate rbpf;
-extern crate solana_program_interface;
-#[macro_use]
-extern crate serde_derive;
 #[macro_use]
 extern crate log;
-
-pub mod bpf_verifier;
+extern crate rbpf;
+#[macro_use]
+extern crate serde_derive;
+extern crate solana_program_interface;
 
 use bincode::{deserialize, serialize};
 use byteorder::{ByteOrder, LittleEndian, WriteBytesExt};
@@ -22,6 +23,7 @@ use std::io::Error;
 use std::mem;
 use std::path::PathBuf;
 use std::str;
+use std::sync::{Once, ONCE_INIT};
 
 /// Dynamic link library prefixs
 const PLATFORM_FILE_PREFIX_BPF: &str = "";
@@ -115,6 +117,12 @@ pub enum BpfLoader {
 
 #[no_mangle]
 pub extern "C" fn process(keyed_accounts: &mut [KeyedAccount], tx_data: &[u8]) -> bool {
+    static INIT: Once = ONCE_INIT;
+    INIT.call_once(|| {
+        // env_logger can only be initialized once
+        env_logger::init();
+    });
+
     if keyed_accounts[0].account.executable {
         let prog: Vec<u8>;
         if let Ok(program) = deserialize(&keyed_accounts[0].account.userdata) {

programs/native/lua_loader/Cargo.toml

@@ -5,6 +5,7 @@ authors = ["Solana Maintainers <maintainers@solana.com>"]
 
 [dependencies]
 bincode = "1.0.0"
+env_logger = "0.5.12"
 log = "0.4.2"
 rlua = "0.15.2"
 serde = "1.0.27"

programs/native/lua_loader/src/lib.rs

@@ -1,16 +1,18 @@
 extern crate bincode;
-extern crate rlua;
-extern crate solana_program_interface;
-#[macro_use]
-extern crate serde_derive;
+extern crate env_logger;
 #[macro_use]
 extern crate log;
+extern crate rlua;
+#[macro_use]
+extern crate serde_derive;
+extern crate solana_program_interface;
 
 use bincode::{deserialize, serialize};
 use rlua::{Lua, Result, Table};
 use solana_program_interface::account::KeyedAccount;
 use solana_program_interface::loader_instruction::LoaderInstruction;
 use std::str;
+use std::sync::{Once, ONCE_INIT};
 
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
 pub enum LuaLoader {
@@ -59,6 +61,12 @@ fn run_lua(keyed_accounts: &mut [KeyedAccount], code: &str, data: &[u8]) -> Resu
 
 #[no_mangle]
 pub extern "C" fn process(keyed_accounts: &mut [KeyedAccount], tx_data: &[u8]) -> bool {
+    static INIT: Once = ONCE_INIT;
+    INIT.call_once(|| {
+        // env_logger can only be initialized once
+        env_logger::init();
+    });
+
     if keyed_accounts[0].account.executable {
         let prog: Vec<u8>;
         if let Ok(program) = deserialize(&keyed_accounts[0].account.userdata) {