From 45307cd8f540e496b9182d3f94d11b2e4785f95c Mon Sep 17 00:00:00 2001
From: brasse <bjorn.blomberg@systematiq.se>
Date: Sat, 4 Jul 2026 16:33:55 +0200
Subject: [PATCH] Don't panic on broken pipe (e.g. `npmctl list-hosts | head`)

Reset SIGPIPE to SIG_DFL at startup so writing to a closed stdout
terminates the process quietly like normal Unix tools, instead of
panicking with "failed printing to stdout: Broken pipe".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011YPrEZVBpPVoCRyJz2exkZ
---
 Cargo.lock  | 1 +
 Cargo.toml  | 3 +++
 src/main.rs | 8 ++++++++
 3 files changed, 12 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index dc6685e..3662d43 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -629,6 +629,7 @@ dependencies = [
  "chrono",
  "clap",
  "dirs",
+ "libc",
  "reqwest",
  "rpassword",
  "serde",
diff --git a/Cargo.toml b/Cargo.toml
index 3799f09..da1a005 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,9 @@ dirs = "5"
 anyhow = "1"
 chrono = { version = "0.4", default-features = false, features = ["clock", "std"] }
 
+[target.'cfg(unix)'.dependencies]
+libc = "0.2"
+
 [profile.release]
 strip = true
 opt-level = "z"
diff --git a/src/main.rs b/src/main.rs
index 4ebbece..2289ad8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,6 +14,14 @@ use client::NpmClient;
 use config::{resolve_base_url, Paths};
 
 fn main() {
+    // Bete oss som vanliga Unix-verktyg när stdout stängs tidigt (t.ex. `| head`):
+    // återställ SIGPIPE till default så processen avslutas tyst i stället för att
+    // panika på "Broken pipe" i println!.
+    #[cfg(unix)]
+    unsafe {
+        libc::signal(libc::SIGPIPE, libc::SIG_DFL);
+    }
+
     // Egen parse-hantering: vid felaktig input skriver vi ut hjälpen
     // (utöver felmeddelandet), enligt önskemål. --help/--version skrivs ut normalt.
     let cli = match Cli::try_parse() {