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## `manifest.nix`

The manifest file records the provenance of the packages that are installed in a profile managed by `nix-env`.

Here is an example of how this file might look like after installing `hello` from Nixpkgs:

    [{
      meta = {
        available = true;
        broken = false;
        changelog =
          "https://git.savannah.gnu.org/cgit/hello.git/plain/NEWS?h=v2.12.1";
        description = "A program that produces a familiar, friendly greeting";
        homepage = "https://www.gnu.org/software/hello/manual/";
        insecure = false;
        license = {
          deprecated = false;
          free = true;
          fullName = "GNU General Public License v3.0 or later";
          redistributable = true;
          shortName = "gpl3Plus";
          spdxId = "GPL-3.0-or-later";
          url = "https://spdx.org/licenses/GPL-3.0-or-later.html";
        };
        longDescription = ''
          GNU Hello is a program that prints "Hello, world!" when you run it.
          It is fully customizable.
        '';
        maintainers = [{
          email = "edolstra+nixpkgs@gmail.com";
          github = "edolstra";
          githubId = 1148549;
          name = "Eelco Dolstra";
        }];
        name = "hello-2.12.1";
        outputsToInstall = [ "out" ];
        platforms = [
          "i686-cygwin"
          "x86_64-cygwin"
          "x86_64-darwin"
          "i686-darwin"
          "aarch64-darwin"
          "armv7a-darwin"
          "i686-freebsd13"
          "x86_64-freebsd13"
          "aarch64-genode"
          "i686-genode"
          "x86_64-genode"
          "x86_64-solaris"
          "js-ghcjs"
          "aarch64-linux"
          "armv5tel-linux"
          "armv6l-linux"
          "armv7a-linux"
          "armv7l-linux"
          "i686-linux"
          "m68k-linux"
          "microblaze-linux"
          "microblazeel-linux"
          "mipsel-linux"
          "mips64el-linux"
          "powerpc64-linux"
          "powerpc64le-linux"
          "riscv32-linux"
          "riscv64-linux"
          "s390-linux"
          "s390x-linux"
          "x86_64-linux"
          "mmix-mmixware"
          "aarch64-netbsd"
          "armv6l-netbsd"
          "armv7a-netbsd"
          "armv7l-netbsd"
          "i686-netbsd"
          "m68k-netbsd"
          "mipsel-netbsd"
          "powerpc-netbsd"
          "riscv32-netbsd"
          "riscv64-netbsd"
          "x86_64-netbsd"
          "aarch64_be-none"
          "aarch64-none"
          "arm-none"
          "armv6l-none"
          "avr-none"
          "i686-none"
          "microblaze-none"
          "microblazeel-none"
          "msp430-none"
          "or1k-none"
          "m68k-none"
          "powerpc-none"
          "powerpcle-none"
          "riscv32-none"
          "riscv64-none"
          "rx-none"
          "s390-none"
          "s390x-none"
          "vc4-none"
          "x86_64-none"
          "i686-openbsd"
          "x86_64-openbsd"
          "x86_64-redox"
          "wasm64-wasi"
          "wasm32-wasi"
          "x86_64-windows"
          "i686-windows"
        ];
        position =
          "/nix/store/7niq32w715567hbph0q13m5lqna64c1s-nixos-unstable.tar.gz/nixos-unstable.tar.gz/pkgs/applications/misc/hello/default.nix:34";
        unfree = false;
        unsupported = false;
      };
      name = "hello-2.12.1";
      out = {
        outPath = "/nix/store/260q5867crm1xjs4khgqpl6vr9kywql1-hello-2.12.1";
      };
      outPath = "/nix/store/260q5867crm1xjs4khgqpl6vr9kywql1-hello-2.12.1";
      outputs = [ "out" ];
      system = "x86_64-linux";
      type = "derivation";
    }]

Each element in this list corresponds to an installed package. It incorporates some attributes of the original derivation, including `meta`, `name`, `out`, `outPath`, `outputs`, `system`. This information is used by Nix for querying and updating the package.