# OMG vs yay: Arch Linux packages, sandboxed AUR builds, and system security

Compare OMG and yay for Arch Linux package and AUR management: direct libalpm C bindings, pure-Rust PKGBUILD parsing, Bubblewrap build sandboxing, and runtime orchestration.

Canonical: https://getomg.xyz/compare/omg-vs-yay/
Updated: 2026-09-22
Author: OMG maintainers

## Architecture and security models

yay is an Arch User Repository (AUR) helper written in Go. It uses ALPM bindings for package information and invokes `pacman` and `makepkg` for package transactions and community builds.

OMG is a systems and developer tool written in Rust. On Arch Linux, it connects to `libalpm` for package queries, parses `PKGBUILD` metadata in Rust, and builds AUR packages inside an unprivileged Bubblewrap (`bwrap`) sandbox by default. Users can explicitly opt into unsafe native builds.

While yay is strictly an Arch Linux package and AUR tool, OMG spans system packages (Arch ALPM, Debian/Ubuntu APT, Fedora DNF, and macOS Homebrew), 14 language runtimes, 54 developer CLI tools, and a polyglot task runner.

## Direct technical comparison

### Architectural and security comparison

| Dimension | OMG and yay |
| --- | --- |
| ALPM database integration | OMG uses `libalpm` through Rust bindings for package database operations. yay also uses ALPM bindings and invokes pacman for package transactions. Compare equivalent operations on your system before drawing speed conclusions. |
| PKGBUILD metadata parsing | OMG parses selected PKGBUILD metadata in Rust (`src/package_managers/pkgbuild.rs`) with a 1MB input limit and `O_NOFOLLOW` protection. Both tools still run AUR build scripts through makepkg; review those scripts before installing. |
| AUR build sandboxing | OMG defaults to a Bubblewrap build sandbox (`bwrap --clearenv --unshare-pid --new-session --die-with-parent`) with read-only system mounts and isolated writable build directories (`src/package_managers/aur/client.rs`). Unsafe native builds require an explicit configuration change. yay invokes makepkg without this OMG sandbox. |
| Privilege separation | OMG performs fetching, review, and building completely unprivileged, elevating via sudo only for the sealed package transaction. Sudo OMG is deprecated. yay prompts for sudo when makepkg requires dependency installation. |
| Attended security gates | OMG halts for explicit attended confirmation if an archive contains install hooks, setuid/setgid files, or Linux file capabilities; `-y` does not bypass these checks. yay has no equivalent install hook analysis. |
| Build caching | OMG maintains a hash-indexed build cache to avoid rebuilding unchanged AUR recipes across updates. yay stores sources in ~/.cache/yay but rebuilds when prompted. |
| Cross-platform and polyglot | OMG also manages language runtimes (Node, Python, Go, Rust, etc.), 54 developer tools, and polyglot tasks on Arch, Debian, Ubuntu, Fedora, and macOS. yay is exclusive to Arch Linux. |

## How OMG’s Bubblewrap sandbox secures AUR builds

Because AUR packages are user-submitted scripts, executing `PKGBUILD` files with full access to your home directory presents serious security risks. A rogue or compromised `prepare()` or `build()` script could read SSH keys, access cloud credentials, or modify user shell configurations.

With the default Bubblewrap build method, `src/package_managers/aur/client.rs` configures an unprivileged Linux sandbox:

1. Pre-flight dependency resolution: official repository dependencies are resolved and installed before entering the sandbox.

2. Read-only root binds: /usr, /etc, /lib, and /lib64 are mounted read-only inside the container.

3. Isolated filesystem: the build process has no access to your $HOME directory, SSH keys, or personal files; only the build staging directory and /tmp are writable.

4. Process isolation: --clearenv strips environment variables, --unshare-pid isolates process namespaces, and --die-with-parent ensures child processes terminate with the build.

5. Privilege isolation: the untrusted build process receives no sudo-capable TTY and cannot elevate privileges.

## When to choose OMG or yay

- Choose OMG if you want its default Bubblewrap AUR build isolation from your home directory and SSH keys.
- Choose OMG if you want a single unified tool that manages Arch packages, AUR software, language runtimes (Node, Python, Go, Rust), and developer CLI tools (`ripgrep`, `starship`, `fzf`).
- Choose OMG if you use its package and runtime commands on multiple supported Linux distributions. Check backend support for each workflow; environment capture currently requires Arch or Debian/Ubuntu.
- Choose yay if you rely on yay-specific interactive number-key selection menus or need to download unbuilt PKGBUILD trees via `yay -G`.

## Sources and verification

Source-reviewed guidance; not a claim of execution on every supported platform.

- [OMG Arch Linux AUR client (src/package_managers/aur/client.rs)](https://getomg.xyz/docs/security/)

- [OMG PKGBUILD parser (src/package_managers/pkgbuild.rs)](https://getomg.xyz/docs/architecture/)

- [Arch Linux PKGBUILD specification](https://man.archlinux.org/man/PKGBUILD.5)

- [Bubblewrap sandbox documentation](https://github.com/containers/bubblewrap)

- [yay manual](https://github.com/Jguer/yay/blob/next/doc/yay.8)

## Related pages

- https://getomg.xyz/guides/migrate-from-yay/

- https://getomg.xyz/compare/omg-vs-mise/

- https://getomg.xyz/docs/security/