experiment: ignore SIGCHLD

docker/alpine/Dockerfile

@@ -0,0 +1,25 @@
+FROM rust:alpine as builder
+
+ADD . /root/wingmate
+
+WORKDIR /root/wingmate
+
+RUN apk add musl-dev && cargo clean && \
+    cargo build --release
+
+FROM alpine
+
+COPY --from=builder /root/wingmate/target/release/wingmate-rs /usr/local/bin/wingmate
+COPY --from=builder /root/wingmate/target/release/wmtest-helper-dummy /usr/local/bin/wmtest-helper-dummy
+COPY --from=builder /root/wingmate/target/release/wmtest-helper-spawner /usr/local/bin/wmtest-helper-spawner
+COPY --from=builder /root/wingmate/target/release/wmtest-helper-log /usr/local/bin/wmtest-helper-log
+
+ADD docker/alpine/etc/ /etc/
+ADD docker/alpine/entry.sh /usr/local/bin/entry.sh
+
+RUN chmod -R ugo+x /etc/wingmate && chmod +x /usr/local/bin/entry.sh && apk add tzdata && \
+    ln -sv /usr/share/zoneinfo/Australia/Sydney /etc/localtime
+
+ENTRYPOINT [ "/usr/local/bin/entry.sh" ]
+
+CMD [ "/usr/local/bin/wingmate" ]

docker/alpine/entry.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+if [ $# -gt 0 ];then
+    exec "$@"
+else
+    exec /usr/local/bin/wingmate
+fi

docker/alpine/etc/wingmate/crontab

@@ -0,0 +1,3 @@
+17 * * * * /etc/wingmate/crontab.d/cron1.sh
+*/5 * * * * /etc/wingmate/crontab.d/cron2.sh
+21,41 3,6,14,17,20,22 * * * /etc/wingmate/crontab.d/cron3.sh

docker/alpine/etc/wingmate/crontab.d/cron1.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec wmtest-helper-log /var/log/cron1.log "this cron runs every hour on minute 17"

docker/alpine/etc/wingmate/crontab.d/cron2.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec wmtest-helper-log /var/log/cron2.log "this cron runs every hour on minute 5,10,15,20,25,30,35,40,45,50,55"

docker/alpine/etc/wingmate/crontab.d/cron3.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec wmtest-helper-log /var/log/cron3.log "this cron runs based on this specification: 21,41 3,6,14,17,20,22 * * *"

docker/alpine/etc/wingmate/services/one

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+export LOG_PATH=/var/log/one.log
+exec /usr/local/bin/wmtest-helper-spawner 10

docker/alpine/etc/wingmate/services/three.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+export LOG_PATH=/var/log/three.log
+exec /usr/local/bin/wmtest-helper-spawner 13

docker/alpine/etc/wingmate/services/two.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+export LOG_PATH=/var/log/two.log
+exec /usr/local/bin/wmtest-helper-spawner 4

docker/bookworm/Dockerfile

@@ -0,0 +1,9 @@
+FROM ubuntu:22.04
+
+ADD target/debug/init /usr/local/bin/init
+ADD docker/etc/ /etc/
+
+RUN chmod ugo+x /etc/wingmate/services/one && chmod ugo+x /etc/wingmate/services/two.sh && \
+    chmod ugo-x /etc/wingmate/services/three.sh
+
+CMD [ "/usr/local/bin/init" ]

docker/bookworm/etc/wingmate/crontab

@@ -0,0 +1,3 @@
+17 * * * * sleep 1
+*/12 * * * * sleep 1
+12,17,27 * * * * sleep 1

docker/bookworm/etc/wingmate/services/one

@@ -0,0 +1 @@
+you cannot run this file

docker/bookworm/etc/wingmate/services/three.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+exec sleep 1

docker/bookworm/etc/wingmate/services/two.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+exec sleep 1

src/bin/test-helper/spawner.rs

@@ -8,14 +8,21 @@ use std::fs::OpenOptions;
 use std::process::Command;
 use std::env;
 use rand::Rng;
+use nix::sys::signal;
 
 fn main() -> Result<(), Box<dyn Error>> {
     let args: Vec<String> = env::args().collect();
+
+    unsafe {
+        signal::signal(signal::Signal::SIGCHLD, signal::SigHandler::SigIgn)
+    }.unwrap();
+
     let mut rng = rand::thread_rng();
 
     let log_path = env::var("LOG_PATH")?;
     let file = OpenOptions::new().append(true).create(true).open(log_path)?;
-    WriteLogger::new(LevelFilter::Debug, Config::default(), file);
+    WriteLogger::init(LevelFilter::Debug, Config::default(), file)?;
+
     if args.len() > 1 {
         let x: u64 = args[1].parse()?;
         loop {