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Date: Thu, 22 Jan 2026 20:35:08 +0000
From: work@janestreet.com
To: josie@linux.com
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Subject: Thank you for applying to Jane Street
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----==_mimepart_697289fc5bca1_12846a50754f9
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Josephine,

Thank you for applying for a position at Jane Street. This email is to confirm that we received your resume and will be in touch shortly regarding your status.

Best,

Jane Street Recruiting
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<p><!--StartFragment--></p>
<p>Josephine,</p>
<p><br>Thank you for applying for a position at Jane Street. This email is to confirm that we received your resume and will be in touch shortly regarding your status.<br><br></p>
<p>Best,</p>
<p>Jane Street Recruiting</p>
<p><!--EndFragment--></p>
----==_mimepart_697289fc5bca1_12846a50754f9--

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	OALyud\n  - Used for long-running processes where parent needs to interact with stdin/stdout\n\n- **`wait(cmd: &Command, child: &mut Child) -> Result<Status>`** (line 137-143)\n  - Calls `.wait()` on spawned Child\n  - Converts exit code to Status\n\n### 2. **Pacman Invocation Pattern**\n\n**`new_pacman()` function (line 183-198):**\n```\n- Creates Command for pacman or (sudo + pacman) if root needed\n- Waits for db.lck if necessary (wait_for_lock)\n- Adds sudo if config.need_root is true\n- Adds pacman config if specified\n- Builds args from Args struct\n```\n\n**Key pacman wrappers:**\n- `pacman(config, args)` → calls command_status\n- `pacman_output(config, args)` → calls command_output with stdin inherited\n\n### 3. **Makepkg Invocation Pattern**\n\n**`new_makepkg()` function (line 214-229):**\n```\n- Creates Command for makepkg binary\n- Adds optional makepkg config\n- Sets PKGDEST environment variable if provided\n- Adds makepkg flags from config\n- Sets working directory\n```\n\n**Key makepkg wrappers:**\n- `makepkg(config, dir, args)` → calls command_status\n- `makepkg_dest(config, dir, args, pkgdest)` → wrapper adding PKGDEST\n- `makepkg_output(config, dir, args)` → calls command_output\n- `makepkg_output_dest(...)` → wrapper for output with PKGDEST\n\n### 4. **All Command::new() Usage Locations**\n\nAbsolute paths of files using Command::new():\n\n| File | Function | Command | Usage Pattern |\n|------|----------|---------|---------------|\n| `/home/josie/development/archlinux/packaging/paru/src/exec.rs` | update_sudo | sudo | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/exec.rs` | new_pacman | pacman/sudo | `.status()` or `.output()` |\n| `/home/josie/development/archlinux/packaging/paru/src/exec.rs` | new_makepkg | makepkg | `.status()` or `.output()` |\n| `/home/josie/development/archlinux/packaging/paru/src/exec.rs` | has_command | any | `.output()` |\n| `/home/josie/development/archlinux/packaging/paru/src/auth.rs` | spawn_auth | current_exe | `.spawn()` (with fd inheritance) |\n| `/home/josie/development/archlinux/packaging/paru/src/keys.rs` | check_pgp_keys | gpg | `.status()` with stdio redirected |\n| `/home/josie/development/archlinux/packaging/paru/src/keys.rs` | import_keys | gpg | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/repo.rs` | add | install/sudo/repo-add/repo-remove | `.output()` or `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/repo.rs` | remove | repo-remove | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/repo.rs` | refresh | sudo + paru | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/repo.rs` | delete | sudo + rm | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/clean.rs` | clean_untracked | git | `.output()` |\n| `/home/josie/development/archlinux/packaging/paru/src/chroot.rs` | create | sudo + install/mkarchroot | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/chroot.rs` | run_as | sudo + arch-nspawn/mkarchroot | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/chroot.rs` | update | sudo + cp | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/chroot.rs` | build | makechrootpkg | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/download.rs` | repo_pkgbuilds | pkgctl | `.output()` |\n| `/home/josie/development/archlinux/packaging/paru/src/download.rs` | pkgbuild_pkgbuilds | cp | `.output()` |\n| `/home/josie/development/archlinux/packaging/paru/src/download.rs` | pipe_bat | bat | `.spawn()` (with stdin piped) |\n| `/home/josie/development/archlinux/packaging/paru/src/install.rs` | pre_build_command | sh -c | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/install.rs` | run_file_manager | file manager | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/install.rs` | sign_packages | gpg | `.status()` |\n| `/home/josie/development/archlinux/packaging/paru/src/install.rs` | view_diff_files | sh (pager) | `.spawn()` (with stdin piped) |\n| `/home/josie/development/archlinux/packaging/paru/src/devel.rs` | ls_remote_internal | AsyncCommand (git) | async `.output()` |\n\n### 5. **Existing File Descriptor Management**\n\n**Current situation:**\n- NO `pre_exec` closures used anywhere\n- NO `CommandExt` trait imported\n- NO unsafe fd manipulation except in auth.rs:\n  - Line 65-66: `unsafe { File::from_raw_fd(...) }` - converts raw fds to File handles\n\n**Only unsafe fd code in `src/auth.rs` (lines 45-72):**\n```rust\npub fn spawn_auth(config: &Config) -> Result<Pipe> {\n    let (paru_read, auth_write) = pipe()?;\n    let (auth_read, paru_write) = pipe()?;\n    \n    Command::new(std::env::current_exe()?)\n        .arg(\"--authpipe\")\n        .arg(auth_read.to_string())\n        .arg(auth_write.to_string())\n        .spawn()?;  // FILE DESCRIPTORS INHERITED HERE!\n    \n    let read = unsafe { File::from_raw_fd(paru_read) };\n    let write = unsafe { File::from_raw_fd(paru_write) };\n    ...\n}\n```\n\nThis is a critical point - `auth.rs` spawns a child process with inherited file descriptors passed as string arguments, but doesn't close the others!\n\n### 6. **Pattern for External Command Execution**\n\nAll external commands follow this flow:\n\n1. **Create Command**: `Command::new(binary_name)`\n2. **Configure**: Set args, env vars, working dir, stdio\n3. **Execute wrapper**: Pass to `command_status()`, `command_output()`, or `spawn()`\n4. **Handle result**: Check for errors or process output\n\n### 7. **Commands Spawned with Stdio Modifications**\n\nThese might need fd sanitization:\n\n- **Stderr redirected to null**: `keys.rs:42-44` (gpg key listing)\n  ```rust\n  .stderr(Stdio::null())\n  ```\n\n- **Stdin piped**: `download.rs:669`, `install.rs:1750`\n  ```rust\n  .stdin(Stdio::piped())\n  ```\n\n- **Stdin inherited**: `exec.rs:210` (pacman_output)\n  ```rust\n  .stdin(Stdio::inherit())\n  ```\n\n### 8. **Async Command Usage**\n\nOnly one async command type found:\n- **`tokio::process::Command`** in `src/devel.rs:264`\n  - Used for git ls-remote with timeout\n  - Calls `.output().await`\n\n### 9. **Recommendations for FD Sanitization**\n\nTo fix \"Error reading fd 7\" from gpgme, you need to:\n\n1. **Add CommandExt import and pre_exec closure** where GPG is invoked:\n   - `src/keys.rs:38, 76` (gpg commands)\n   - `src/install.rs:2146` (gpg signing)\n\n2. **Close inherited fds before spawn**:\n   - Use `libc::close()` or similar in pre_exec for fds > 3\n   - Apply especially to commands dealing with crypto (gpg)\n\n3. **Highest priority files to patch**:\n   - `/home/josie/development/archlinux/packaging/paru/src/keys.rs` - Direct GPG calls\n   - `/home/josie/development/archlinux/packaging/paru/src/install.rs` - GPG signing\n   - `/home/josie/development/archlinux/packaging/paru/src/auth.rs` - Already inherits fds intentionally\n\n4. **Pattern to implement**:\n   ```rust\n   use std::os::unix::process::CommandExt;\n   \n   let mut cmd = Command::new(\"gpg\");\n   // ... add args ...\n   unsafe {\n       cmd.pre_exec(|| {\n           // Close fds 3 and above\n           // except those intentionally inherited\n       });\n   }\n   ```"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":948,"cache_read_input_tokens":47496,"cache_creation":{"ephemeral_5m_input_tokens":948,"ephemeral_1h_input_tokens":0},"output_tokens":1,"service_tier":"standard"}},"requestId":"req_011CXStmp7Jj2dKuhCCyyQzb","type":"assistant","uuid":"540bb785-e0c5-4bdd-beb6-38be53eb9b58","timestamp":"2026-01-24T21:13:53.702Z"}
