release September 3, 2026

Berthly 1.3.0: keeping up with apple/container 1.3.0

Berthly 1.3.0 is out, catching up to apple/container 1.3.0. The vendored apple/container / containerization dependency moves to 1.3.0 / 0.41.0, and most of the work was keeping Berthly’s behavior steady across one breaking upstream change.

Local registries still work without the insecure toggle

container 1.3.0 removed the auto connection scheme and the check behind it that decided whether a registry host was only reachable locally — localhost, an RFC 1918 private IP (10/8, 172.16/12, 192.168/16), or a name under your internal DNS domain. Without that check every registry connection defaults to HTTPS, and a plain-HTTP registry on your laptop or LAN becomes unreachable unless you explicitly allow insecure registries.

Berthly runs that detection itself now. Pulling, pushing, recreating a container against a newer image, or signing in to a registry on a local or private host still resolves to HTTP with no “Allow insecure registry” toggle — same as before 1.3.0.

One case does change: Run and Machine → Create against an image from an un-toggled internal registry now need “Allow insecure registry” turned on. That one setting also governs the init-image fetch that happens alongside your image, so it can’t be decided per host. If you’d rather not flip it, pull the image first and then run it.

Smaller fixes that come along for free

  • tmpfs mounts with options land at the right path. container 1.3.0 rewrote its tmpfs parsing — a Run-sheet entry like /scratch:rw now mounts a tmpfs at /scratch with those options, instead of creating a mount literally named /scratch:rw. Berthly verifies this end-to-end against a real 1.3.0 daemon.
  • arm64 platform labels drop the redundant /v8. containerization 0.41.0 renders an arm64 platform as linux/arm64, matching how Docker and containerd show it; Berthly’s build-platform display follows.

Getting it

  • Already on Berthly? Use Berthly → Check for Updates….
  • New to Berthly? Download Berthly-1.3.0.dmg, open it, and drag Berthly.app into Applications. It’s Developer ID–signed and notarized, so it opens without warnings.

Testing

This release shipped only after its gate run passed on the release commit: 531 unit tests (90% line coverage of the pure logic layer), 77 UI tests against a mock daemon, and 20 real-daemon end-to-end journeys.

Full details in the release notes.

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