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your Rust/C/C++/Go program under rr and time-travel through every line in the rr-dash dashboard — created by replay.io","maintainers":[{"name":"bel423","email":"bel423@gmail.com"}],"readme":"# rion\n\nRecord your **Rust / C / C++ / Go** program under [rr](https://rr-project.org)\nand time-travel through every line it executed — hit counts, call stacks,\nwatch values at every step, a flamechart, and a scrubbable timeline that\nstreams in **live while the recording is still running**.\n\nCreated by [replay.io](https://replay.io) — the time-travel debugging\nindustry leaders.\n\n```bash\nnpx @brett_lamy/rion record -- ./your-program\n```\n\nYour default browser pops open on the live trace the moment recording\nstarts.\n\n## Requirements\n\n- **Docker** — recording runs inside a sandboxed `rr` container (rion builds\n the image on first use: `npx @brett_lamy/rion doctor --build`)\n- **Node 18+**\n- A program built with debug info (`-g -O0`, cargo dev profile, or\n `go build -gcflags='all=-N -l'`) — the binary must be a **Linux** build,\n since it runs inside the container\n\n## Getting started\n\n```bash\n# 1. Sign in (opens your browser to approve this CLI):\nnpx @brett_lamy/rion login\n\n# 2. Check your setup (and build the recorder image on first run):\nnpx @brett_lamy/rion doctor --build\n\n# 3. Record, from your project directory:\nnpx @brett_lamy/rion record -- ./target/debug/your-program\n```\n\nThe trace uploads to [rr-dash](https://rr-dash-brett.netlify.app) under\nyour account and starts streaming immediately — you can watch execution\narrive line by line while the program is still being recorded.\n\n## Commands\n\n| Command | What it does |\n| --- | --- |\n| `rion login [--server ]` | Browser-approval sign-in; token cached at `~/.config/rion/auth.json` |\n| `rion logout` | Forget the saved token |\n| `rion doctor [--build]` | Verify Docker, the recorder images, and connectivity |\n| `rion record [opts] -- ` | Record `` under rr and upload the trace |\n\n### `record` options\n\n| Flag | Default | Description |\n| --- | --- | --- |\n| `--lang rust\\|c\\|cpp\\|go` | auto-detected | Source language |\n| `--src ` | cwd | Project directory (mounted into the sandbox) |\n| `--title ` | the command | Trace title in the dashboard |\n| `--id ` | generated | Explicit recording id |\n| `--server ` | rr-dash prod | Dashboard host |\n\n### Environment variables\n\n| Variable | Purpose |\n| --- | --- |\n| `RION_API_KEY` | Non-interactive auth (create one at [/welcome](https://rr-dash-brett.netlify.app/welcome)) — the CI equivalent of `rion login` |\n| `RION_HOST` | Override the default dashboard host |\n| `RION_NO_OPEN` | Set to `1` to skip auto-opening the trace in a browser |\n\n## How it works\n\n`rion record` runs your command under `rr record` (software-counters mode)\nin a Docker sandbox, replays the trace under gdb to extract per-line hit\ncounts, an ordered linetrace, and sampled call stacks + locals at every\nstep, then uploads everything through the dashboard's authenticated API.\nNothing is uploaded anonymously; recordings are attributed to your account.\n\nPrefer zero local setup? The\n[Playground](https://rr-dash-brett.netlify.app/playground) compiles and\nrecords small programs in a cloud sandbox instead.\n","readmeFilename":"README.md"}