Ludovic Marie
1569572ba0
The game writes logs/latest.log in its home like vanilla's log4j config (client-1.21.2.xml): [HH:mm:ss] [thread/LEVEL]: message, rolled at start and at midnight to logs/<date>-<n>.log.gz, seven a day. Messages go through the log facade and still print their old text on stderr. A main-thread panic or a fatal error writes crash-reports/crash-<date>_<time>-client.txt (error, stack, Horizon and Minecraft versions, OS, CPU, memory, GPU adapter, render settings, resource packs, world, last 50 log lines). Development builds crash on purpose with HORIZON_DEBUG_CRASH. The launcher shows "Horizon crashed" when the game it started ends badly, with Open report, Copy report, Open logs folder and Report on Discord; Settings gets a Logs row. horizon-launcher logs and horizon-ctl logs (--lines N, --crash) print the log's end or the newest report, and both MCP servers have a logs tool. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
63 lines
2.2 KiB
Rust
63 lines
2.2 KiB
Rust
//! `horizon-launcher logs`: the end of the game's latest.log, and its newest crash report.
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use std::path::Path;
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use std::process::Command;
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fn logs(home: &Path, args: &[&str]) -> (bool, String, String) {
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let out = Command::new(env!("CARGO_BIN_EXE_horizon-launcher"))
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.arg("logs")
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.args(args)
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.env("HORIZON_HOME", home)
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.output()
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.unwrap();
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(
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out.status.success(),
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String::from_utf8_lossy(&out.stdout).into_owned(),
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String::from_utf8_lossy(&out.stderr).into_owned(),
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)
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}
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#[test]
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fn logs_prints_the_log_tail_and_the_newest_crash_report() {
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let home = std::env::temp_dir().join(format!("horizon-launcher-logs-{}", std::process::id()));
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let _ = std::fs::remove_dir_all(&home);
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let (ok, _, err) = logs(&home, &[]);
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assert!(!ok);
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assert!(err.contains("latest.log"), "{err}");
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std::fs::create_dir_all(home.join("logs")).unwrap();
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let text: String = (1..=150)
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.map(|i| format!("[10:00:00] [Render thread/INFO]: line {i}\n"))
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.collect();
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std::fs::write(home.join("logs/latest.log"), text).unwrap();
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let (ok, out, _) = logs(&home, &[]);
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assert!(ok);
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assert_eq!(out.lines().count(), 100);
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assert!(out.starts_with("[10:00:00] [Render thread/INFO]: line 51\n"));
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let (_, out, _) = logs(&home, &["--lines", "1"]);
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assert_eq!(out, "[10:00:00] [Render thread/INFO]: line 150\n");
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let (_, out, _) = logs(&home, &["--json", "--lines", "1"]);
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let json: serde_json::Value = serde_json::from_str(&out).unwrap();
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assert_eq!(json["text"], "[10:00:00] [Render thread/INFO]: line 150\n");
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assert!(json["path"].as_str().unwrap().ends_with("latest.log"));
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let (ok, _, err) = logs(&home, &["--crash"]);
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assert!(!ok);
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assert!(err.contains("No crash report"), "{err}");
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std::fs::create_dir_all(home.join("crash-reports")).unwrap();
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std::fs::write(
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home.join("crash-reports/crash-2026-10-13_08.00.00-client.txt"),
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"old\n",
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)
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.unwrap();
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std::fs::write(
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home.join("crash-reports/crash-2026-10-14_08.00.00-client.txt"),
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"new\n",
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)
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.unwrap();
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let (ok, out, _) = logs(&home, &["--crash"]);
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assert!(ok);
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assert_eq!(out, "new\n");
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let _ = std::fs::remove_dir_all(&home);
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}
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