XbAoEyg== Date: Thu, 22 Jan 2026 20:35:08 +0000 From: work@janestreet.com To: josie@linux.com Message-ID: <697289fc5d6a7_12846a507553a@prod-s2-greenhouse-sidekiq-mailer-worker-76b679c476-gbhcn.mail> Subject: Thank you for applying to Jane Street Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="--==_mimepart_697289fc5bca1_12846a50754f9"; charset=UTF-8 Content-Transfer-Encoding: 7bit X-GH-Mailer: Email::CustomSmtpClient::SmtpMailer#send_with_body X-GH-Action: JobBoardCandidateImporting::Workers::JobApplicationsImporterWorker organization-id: 4002324002 organization-name: Jane Street -x-gh-msgid: bc833c6476dbdb688b6d X-DKIM: signer='forwardemail.net' status='pass' reason='' DKIMCheck: Server passes DKIM test, 0 Spam score X-DKIM: signer='janestreet.com' status='pass' reason='' X-Spam-Score: 2.8 (++) X-Spam-Report: Spam detection software, running on the system "witcher.mxrouting.net", has performed the tests listed below against this email. Information: https://mxroutedocs.com/directadmin/spamfilters/ --- Content analysis details: (2.8 points) --- pts rule name description ---- ---------------------- ----------------------------------------- 1.5 HEADER_FROM_DIFFERENT_DOMAINS From and EnvelopeFrom 2nd level mail domains are different 1.5 HTML_MESSAGE BODY: HTML included in message -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain SpamTally: Final spam score: 28 ----==_mimepart_697289fc5bca1_12846a50754f9 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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 ----==_mimepart_697289fc5bca1_12846a50754f9 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit

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

----==_mimepart_697289fc5bca1_12846a50754f9-- From - Thu Jan 22 21:10:18 2026 X-Mozilla-Status: 0001 X-Mozilla-Status2: 00000000 Return-Path: <0101019be78b1c7b-862cf9eb-d075-4f94-a4ff-8d334b5b6ced-000000@us-west-2.amazonses.com> Delivered-To: hi@josie.lol Received: from witcher.mxrouting.net by witcher.mxrouting.net with LMTP id SNJjEziScml9RyEAYBR5ng (envelope-from <0101019be78b1c7b-862cf9eb-d075-4f94-a4ff-8d334b5b6ced-000000@us-west-2.amazonses.com>) for ; Thu, 22 Jan 2026 21:10:16 +0000 Return-path: <0101019be78b1c7b-862cf9eb-d075-4f94-a4ff-8d334b5b6ced-000000@us-west-2.amazonses.com> Envelope-to: hi@josie.lol Delivery-date: Thu, 22 Jan 2026 21:10:16 +0000 Received: from a27-194.smtp-out.us-west-2.amazonses.com ([54.240.27.194]) by witcher.mxrouting.net with esmtps (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.98) (envelope-from <0101019be78b1c7b-862cf9eb-d075-4f94-a4ff-8d334b5b6ced-000000@us-west-2.amazonses.com>) id 1vj1wV-00000009afx-3SAJ for hi@josie.lol; Thu, 22 Jan 2026 21:10:16 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=wiot63u4yih6mdmjibnoe7kp43vbumdg; d=lfx.dev; t=1769116212; h=Content-Type:To:Subject:Message-Id:From:Date:Mime-Version; bh=ClB+N1i4zi+/EYny6evNuBQTd64QkQnnWHjhVxJV/G0=; b=CkoQOWw3s0XnZIO+QNbazX/D+mBiMQKxBBAqpDmQ7wcKPyPrMHlN+L3j7pyNWUXL lxrenp1DIsrESd/ZpNqMgevUmhWObPJgi/eY/Lqe8HgYdKsuaGPPmwUwWyeuouD+apM OALyud\n - Used for long-running processes where parent needs to interact with stdin/stdout\n\n- **`wait(cmd: &Command, child: &mut Child) -> Result`** (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 {\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"}