From ab442eb10f51efd94eb0236114bf28c026816c20 Mon Sep 17 00:00:00 2001
From: Michal Rostecki <vadorovsky@gmail.com>
Date: Tue, 20 Sep 2022 11:22:10 +0200
Subject: [PATCH] Don't fail on `BpfLogger::init()` error

An error during `BpfLogger` initialization most likely means that
`ayalog-ebpf` is not used in the eBPF crate.

Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>
---
 {{project-name}}/src/main.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/{{project-name}}/src/main.rs b/{{project-name}}/src/main.rs
index ed1e90d..a16a6ef 100644
--- a/{{project-name}}/src/main.rs
+++ b/{{project-name}}/src/main.rs
@@ -38,7 +38,7 @@ use aya::programs::SocketFilter;
 {%- endcase %}
 use aya_log::BpfLogger;
 use clap::Parser;
-use log::info;
+use log::{info, warn};
 use tokio::signal;
 
 #[derive(Debug, Parser)]
@@ -73,7 +73,10 @@ async fn main() -> Result<(), anyhow::Error> {
     let mut bpf = Bpf::load(include_bytes_aligned!(
         "../../target/bpfel-unknown-none/release/{{project-name}}"
     ))?;
-    BpfLogger::init(&mut bpf)?;
+    if let Err(e) = BpfLogger::init(&mut bpf) {
+        // This can happen if you remove all log statements from your eBPF program.
+        warn!("failed to initialize eBPF logger: {}", e);
+    }
     {% case program_type -%}
     {%- when "kprobe", "kretprobe" -%}
     let program: &mut KProbe = bpf.program_mut("{{crate_name}}").unwrap().try_into()?;