Nikolay EdigaryevandFedor Korotkov 1b81b12760 tart pull: try to re-use APFS blocks by cloning the base image (#864)
* tart pull: try to re-use APFS blocks by cloning the base image

* Punch a hole when a zero chunk is detected

* Properly retrieve errno when hole punching operation fails

* tart pull: do not retry on RuntimeError

* Ensure that the holes we're about to punch are FS block size-aligned

* VMDirectory: remove unused static variables

* tart pull: log if we've found an image to deduplicate against

* Do not prematurely read contents from disk

* Only consider candidates with deduplicatedBytes more than 0

* APFS reuse UX/DX improvements (#870)

* Show how much deduplication happening

Improvement to the APFS deduplication logic which checks whether a disk image file `mayShareFileContent` with some other file, and then we put a custom attribute to track the deduplication since there is no way to get this information from APFS itself.

It's not 100% accurate but given that OCI cache is immutable the actual disk usage can only be lover than that.

* Use string attribute

* Update Sources/tart/URL+Prunable.swift

Co-authored-by: Nikolay Edigaryev <edigaryev@gmail.com>

* Added SizeOnDisk colume

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Co-authored-by: Nikolay Edigaryev <edigaryev@gmail.com>

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Co-authored-by: Fedor Korotkov <fedor.korotkov@gmail.com>
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Tart is a virtualization toolset to build, run and manage macOS and Linux virtual machines (VMs) on Apple Silicon. Built by CI engineers for your automation needs. Here are some highlights of Tart:

  • Tart uses Apple's own Virtualization.Framework for near-native performance.
  • Push/Pull virtual machines from any OCI-compatible container registry.
  • Use Tart Packer Plugin to automate VM creation.
  • Easily integrates with any CI system.

Tart powers Cirrus Runners service — a drop-in replacement for the standard GitHub-hosted runners, offering 2-3 times better performance for a fraction of the price.

Many companies are using Tart in their internal setups. Here are a few of them:

Note: If your company or project is using Tart please consider sharing with the community.

Usage

Try running a Tart VM on your Apple Silicon device running macOS 13.0 (Ventura) or later (will download a 25 GB image):

brew install cirruslabs/cli/tart
tart clone ghcr.io/cirruslabs/macos-sonoma-base:latest sonoma-base
tart run sonoma-base

Please check the official documentation for more information and/or feel free to use discussions for remaining questions.

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macOS and Linux VMs on Apple Silicon to use in CI and other automations
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