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apfs

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Explain APFS CoW and cloning on macOS.

Software Engineering#macos#nix#spotlight#cow#apfs#clonefile#diskutil
AuthorJylhis
Version1.0.0
Installs0

System Documentation

What problem does it solve?

Clarifies APFS Copy-on-Write behavior and macOS filesystem nuances to help developers optimize file operations and storage layout.

Core Features & Use Cases

  • CoW behavior overview: explains how clonefile(2) and cp -c enable instant cloning on the same APFS volume and the limitations across volumes.
  • Volume planning for development: how to set up a case-sensitive dev volume to catch cross-platform bugs.
  • Spotlight and Time Machine considerations: guidance on excluding dev directories to reduce churn.
  • Nix-on-macOS architecture overview: synthetic /nix and dedicated Nix Store volume configuration.

Quick Start

Read the guide and apply CoW-aware copy strategies on macOS, including enabling clonefile-based cloning and setting up a case-sensitive development volume.

Dependency Matrix

Required Modules

None required

Components

Standard package

💻 Claude Code Installation

Recommended: Let Claude install automatically. Simply copy and paste the text below to Claude Code.

Please help me install this Skill:
Name: apfs
Download link: https://github.com/Jylhis/skills/archive/main.zip#apfs

Please download this .zip file, extract it, and install it in the .claude/skills/ directory.
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