cgwalters

$ cargo build --release
   Compiling krunkit v0.1.0 (/Users/walters/src/github/containers/krunkit)
error: linking with `cc` failed: exit status: 1
  |
  = note: env -u IPHONEOS_DEPLOYMENT_TARGET -u TVOS_DEPLOYMENT_TARGET LC_ALL="C" PATH="/Users/walters/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-apple-darwin/bin:/usr/bin:/bin:/opt/podman/bin:/opt/homebrew/bin:/Users/walters/.cargo/bin:/usr/local/bin" VSLANG="1033" ZERO_AR_DATE="1" "cc" "-arch" "arm64" "/var/folders/9j/jpms114j76q64fhjrq8kw71w0000gn/T/rustcAo9YET/symbols.o" "/Users/walters/src/github/containers/krunkit/target/release/deps/krunkit-0fa2d8ec3a3c8061.krunkit.65e17eeac52f16f7-cgu.00.rcgu.o" "/Users/walters/src/github/containers/krunkit/target/release/deps/krunkit-0fa2d8ec3a3c8061.krunkit.65e17eeac52f16f7-cgu.01.rcgu.o" "/Users/walters/src/github/containers/krunkit/target/release/deps/krunkit-0fa2d8ec3a3c8061.krunkit.65e17eeac52f16f7-cgu.02.rcgu.o" "/Users/walters/src/github/containers/krunkit/target/release/deps/krunkit-

cgwalters

podman --log-level debug machine init --now                                                                                                                                                                    01/02/24 10:13:12 AM
INFO[0000] /Users/walters/src/github/containers/podman/bin/darwin/podman filtering at log level debug 
DEBU[0000] Using Podman machine with `applehv` virtualization provider 
DEBU[0000] Detected compression format gzip             
Extracting compressed file: podman-machine-default_fedora-coreos-39.20231204.2.1-applehv.aarch64.raw: done  
DEBU[0007] creating runtimeDir: /var/folders/9j/jpms114j76q64fhjrq8kw71w0000gn/T/podman 
DEBU[0007] resizing disk to 100 GiB                     
DEBU[0007] resizing /Users/walters/.local/share/containers/podman/machine/applehv/podman-machine-default_fedora-coreos-39.20231204.2.1-applehv.aarch64.raw to 107374182400 bytes 
Machine init complete
Starting machine "podman-machine-default"

cgwalters

apiVersion: v1
kind: ConfigMap
metadata:
  name: test-unit
  annotations:
    bootc.prefix: "/usr/lib/systemd/system"
data:
  example.service: |
    [Service]
    ExecStart=echo hello world

cgwalters

Feb 27 15:07:10 cosa-devsh podman[1491]: 2023-02-27 15:07:10.972716987 +0000 UTC m=+0.192006555 container create 0260f6a600eb61b4cf3f1b536c60b13954309da06197188251e0ff1482543434 (image=docker.io/library/busybox:latest, name=loving_driscoll)
Feb 27 15:07:10 cosa-devsh kernel: bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
Feb 27 15:07:10 cosa-devsh NetworkManager[1169]: <info>  [1677510430.9996] manager: (cni-podman0): new Bridge device (/org/freedesktop/NetworkManager/Devices/3)
Feb 27 15:07:11 cosa-devsh podman[1491]: 2023-02-27 15:07:10.917733235 +0000 UTC m=+0.137022821 image pull  busybox
Feb 27 15:07:11 cosa-devsh NetworkManager[1169]: <info>  [1677510431.0286] manager: (veth7c04525f): new Veth device (/org/freedesktop/NetworkManager/Devices/4)
Feb 27 15:07:11 cosa-devsh kernel: cni-podman0: port 1(veth7c04525f) entered blocking state
Feb 27 15:07:11 cosa-devsh kernel: cni-podman0: port 1(veth7c04525f) entered disab

cgwalters

```
-rw-r--r--. 1 walters walters 613M Feb 15 17:16 qcow2.xz
-rw-r--r--. 1 walters walters 669M Feb 15 17:58 qcow2.zstd
$ time xz -d < qcow2.xz >/dev/null

________________________________________________________
Executed in   12.62 secs    fish           external
   usr time   12.51 secs  190.00 micros   12.51 secs
   sys time    0.09 secs   69.00 micros    0.09 secs

cgwalters

#![feature(try_trait_v2)]

use anyhow::Result; // 1.0.57
use core::ops::Try;

trait TryOrElse<T> {
    fn try_or_else<R: Try<Output = T>, F: FnOnce() -> R>(self, f: F) -> R;
}

// Proposed new API for Option https://github.com/rust-lang/libs-team/issues/59

cgwalters

In Rust, the Option and Result types are really common. Here are a few idioms I've discovered for working with them using combinators which can simplify code:

map(Ok).unwrap_or_else(): Taking Option with fallible fallback to T

    // Our program needs a string for something (e.g. filename, database table name, etc).
    // To start, we can get this as an optional string - here a CLI argument, but it could be anything; e.g.
    // a value parsed from JSON, etc.  The `.nth(1)` call here gives us an `Option<String>`.
    // We want to compute a fallback value, but doing so can fail (e.g. return `Result<String>`).

cgwalters

Ubuntu Core investigation

Following up to this tweet.

Setup

I followed the qemu instructions, using ubuntu-core-20-amd64.img.

Investigating the mount/block setup

cgwalters

$ podman pull quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:502f9b8333a88ecee1eb7e904af5cb0c75946e3084a553374079abf862446c70
Trying to pull quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:502f9b8333a88ecee1eb7e904af5cb0c75946e3084a553374079abf862446c70...
Getting image source signatures
Copying blob 1e138cc587ef done  
Copying blob 54183f4a5679 done  
Copying blob fadcf7c660d5 done  
Copying config 10b43b2460 done  
Writing manifest to image destination
Storing signatures

cgwalters

flowchart TB
    subgraph ostreebuild [ostree build]
    quayprevious["previous ostree container"] -->|change detection| container["ostree container"]
    configgit["config git"]-->container
    rpms --> container["ostree container"]
    container --> quay["quay.io"]
    end
    subgraph imagebuild [image build]
 quay --> qemu["qemu image"]