Use streamLayeredImage

Dependencies

• [2] VUARRVTI Clean up strings
• [3] X3HISPCS Add 05-static-container
• [4] ZYNDBBN3 Update some texts
• [5] 42DGMBYM Fix CI
• [6] P5VCQ5VE Strip small static executable
• [7] VX6OFBL3 Tweak 05

Change contents

• edit in 05-static-container/podman-devshell.nix at line 7
  [3.2427]→[3.2427:2628](∅→∅)
  − # Provides a fake "docker" binary mapping to podman

  − dockerCompat = pkgs.runCommandNoCC "docker-podman-compat" {} ''

  − mkdir -p $out/bin

  − ln -s ${pkgs.podman}/bin/podman $out/bin/docker

  − '';

  −
• edit in 05-static-container/podman-devshell.nix at line 17
  [3.3033]→[3.3033:3083](∅→∅)
  − dockerCompat # Aliases for docker / podman
• replacement in 05-static-container/flake.nix at line 32
  [3.4082]→[3.4082:4143](∅→∅)
  − wttr-delft-container = pkgs.dockerTools.buildImage {
  [3.4082]

  [3.4143]
  + # Actually, this makes a script that dumps the image to stdout,

  + # in this way we can load the data directly into Podman, without

  + # having a copy of the image in the Nix store; for large images this is very convenient!

  + wttr-delft-container = pkgs.dockerTools.streamLayeredImage {
• replacement in 05-static-container/demo.sh at line 13
  [3.5999]→[2.409:433](∅→∅)
  − h "Build the container"
  [3.5999]

  [3.6053]
  + h "Build the container stream"
• replacement in 05-static-container/demo.sh at line 16
  [3.6078]→[2.434:470](∅→∅),[2.470]→[3.18:37](∅→∅),[3.76]→[3.18:37](∅→∅)
  − n "It's a lot smaller than before!"

  − x ls -lhH ./result
  [3.6078]

  [3.6104]
  + n "The output is now a script:"

  + x pygmentize -l bash ./result
• replacement in 05-static-container/demo-inside-nix-develop.sh at line 12
  [3.6427]→[2.657:727](∅→∅),[2.727]→[3.39:65](∅→∅),[3.180]→[3.39:65](∅→∅)
  − h "We start by loading the container we just made into the registry:"

  − x docker load -i ./result
  [3.6427]

  [3.6531]
  + h "We start by loading the container stream we just made into the registry:"

  + , "Just pipe it directly into podman"

  + x "./result | podman load"
• replacement in 05-static-container/demo-inside-nix-develop.sh at line 16
  [3.6532]→[2.728:770](∅→∅),[3.61]→[3.6558:6611](∅→∅),[2.770]→[3.6558:6611](∅→∅),[3.6558]→[3.6558:6611](∅→∅)
  − h "We can see it's there, and it's tiny!"

  − x "docker image ls | grep 'wttr-delft\|^REPOSITORY'"
  [3.6532]

  [3.6611]
  + h "We can see the final image is there, and it's tiny!"

  + x "podman image ls | grep 'wttr-delft\|^REPOSITORY'"
• edit in 05-static-container/demo-inside-nix-develop.sh at line 19
  [3.6612]

  [2.771]
  + , "Some more information is available:"

  + x "podman inspect localhost/wttr-delft:nix | pygmentize -l json"

  +
• replacement in 05-static-container/demo-inside-nix-develop.sh at line 23
  [2.798]→[3.6637:6679](∅→∅),[3.6637]→[3.6637:6679](∅→∅)
  − x docker run -it localhost/wttr-delft:nix
  [2.798]

  [3.6679]
  + x "podman run -it localhost/wttr-delft:nix"