Installsh

installsh is an open-source installer framework designed to simplify software deployment from the command line by providing a standardized, scriptable workflow for shell-based installers. It focuses on portability across Unix-like systems and, with appropriate adapters, on Windows environments that support POSIX shells.

Key features include a manifest-driven installation model, idempotent steps, dependency checking, environment detection, logging and dry-run capabilities, error handling with rollback support, and a plugin system that allows custom install actions.

Architecture centers on a manifest file that describes steps, dependencies, and metadata. A lightweight runner executes steps in a defined order, performing platform checks and invoking installer actions via shell functions. It includes environment adapters for Bash and Zsh, and optional Windows compatibility through Git Bash or WSL.

Usage typically involves creating a manifest file that lists required packages, files to copy, services to start, and post-install verifications; then running installsh to apply it. For example, a manifest may declare steps such as installing a dependency, verifying a version, and configuring a service.

Adoption and licensing: The project has been adopted by several open-source projects seeking a consistent installer interface. Licensing varies by release; typical distributions use permissive licenses.

See also: Shell scripting, Software packaging.