Programmer in California

I’m also on https://leminal.space/u/hallettj

  • 6 Posts
  • 144 Comments
Joined 2 years ago
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Cake day: May 7th, 2023

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  • I think you can mount an ISO image under your running system and make changes. I found a couple of guides that might be helpful:

    How to Mount an ISO File on Linux

    Edit and repack .iso bootable image

    I haven’t done this before, but I think you can chroot into the mount directory, and run package manager commands in the mounted image to install another package.

    Or I have an alternative suggestion that might or might not be easier. I’ve been hearing a lot about immutable/atomic distros, and people designing their own images. You could make your own ublue image, for example, with whatever you want on it.

    A promising looking starting point is github:ublue-os/startingpoint. Ignore the “Installation” instructions, and follow the “ISO” instructions instead.

    Or I saw recently an announcement of a new way to build atomic images that is supposed to be easier than ever, BlueBuild







  • (This is probably explained in the article, but I don’t have a subscription.) The National Ignition Facility (NIF) creates fusion by bombarding a fuel capsule with lasers. The laser beams are reflected many times to build up energy, and to converge on the capsule. There is energy loss during that process so the laser energy that goes into the capsule is a small fraction of the electricity used to fire the lasers. When they say they got twice the energy out, that’s compared to the laser energy going into the capsule, not the energy required to fire the lasers. So its a long way off from a practical power plant, but still important progress.

    The purpose of the NIF is to study what goes on inside the capsule - for better understanding, and to figure out how to get the most possibly energy out of a fusion reaction. Once they have figured that out a possible next step is to design a system that delivers laser beams with less input energy. It’s easier to do that after you know the ideal way for beams to interact with the capsule. Or maybe we never build a power plant based on the NIF design, but the findings help to make other reactor designs work.



  • Well you’re really feeding my Nix confirmation bias here. I used to use Ansible with my dot files to configure my personal computers to make it easy to get set up on a new machine or server shell account. But it wasn’t great because I would have to remember to update my Ansible config whenever I installed stuff with my OS package manager (and usually I did not remember). Then along came Nix and Home Manager which combined package management and configuration management in exactly the way I wanted. Now my config stays in sync because editing it is how I install stuff.

    Nix with either Home Manager or NixOps checks all of the benefits you listed, except arguably using a “known” programming language. What are you waiting for?








  • Well ok, they both use symlinks but in different ways. I think what I was trying to say is that in NixOS it’s symlinks all the way down.

    IIUC on Fedora Atomic you have an ostree image, and some directories in the image are actually symlinks to the mutable filesystem on /var. Files that are not symlinks to /var (and that are not inside those symlinked directories), are hard links to files in the ostree object store. (Basically like checked-out files in a git repository?)

    On NixOS this is what happens if examine what’s in my path:

    $ which curl
    /run/current-system/sw/bin/curl
    
    $ ls -l /run | grep current-system
    /run/current-system -> /nix/store/p92xzjwwykjj1ak0q6lcq7pr9psjzf6w-nixos-system-yu-23.11.20231231.32f6357
    
    $ ls -l /run/current-system/sw/bin/curl
    /run/current-system/sw/bin/curl -> /nix/store/r304lglsa9i2jy5hpbdz48z3j3x2n4a6-curl-8.4.0-bin/bin/curl
    

    If I select a previous configuration when I boot I would get a different symlink target for /run/current-system. And what makes updates atomic is the last step is to switch the /run/current-system symlink which switches over all installed packages at once.

    I can temporarily load up the version of curl from NixOS Unstable in a shell and see a different result,

    $ nix shell nixpkgs-unstable#curl  # this works because I added nixpkgs-unstable to my flake registry
    $ which curl
    /nix/store/0mjq6w6cx1k9907vxm0k5pk7pm1ifib3-curl-8.4.0-bin/bin/curl  # note the hash is different
    

    I could have a different version curl installed in my user profile than the one installed system-wide. In that case I’d see this:

    $ which curl
    /home/jesse/.nix-profile/bin/curl
    
    $ ls -la /home/jesse | grep .nix-profile
    .nix-profile -> /nix/var/nix/profiles/per-user/jesse/profile
    
    $ ls -l /nix/var/nix/profiles/per-user/jesse
    profile -> profile-133-link
    profile-130-link -> /nix/store/ylysfs90018zc9k0p0dg7x6wvzqcq68j-user-environment
    profile-131-link -> /nix/store/9hjiznbaii7a8aa36i8zah4c0xcd8w6d-user-environment
    profile-132-link -> /nix/store/h4kkw1m5q6zdhr6mlwr26n638vdbbm2c-user-environment
    profile-133-link -> /nix/store/jgxhrhqiagvhd6g42d17h4jhfpgxsk3n-user-environment
    

    Basically symlinks upon symlinks everywhere you look. (And environment variables.)

    So I guess at the end everything is symlinks on NixOS, and everything is hard links plus a set of mount paths on Fedora Atomic.