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squashfs.nix (971B)

      1 {
      2   buildPackages,
      3   callPackage,
      4   nixpkgs,
      5   pseudofile,
      6   runCommand,
      7   writeText,
      8 }:
      9 filesystem:
     10 let
     11   pseudofiles = pseudofile.write "files.pf" filesystem;
     12 
     13   storefs = callPackage "${nixpkgs}/nixos/lib/make-squashfs.nix" {
     14     # 1) Every required package is referenced from somewhere
     15     # outside /nix/store. 2) Every file outside the store is
     16     # specified by config.filesystem. 3) Therefore, closing over
     17     # the pseudofile will give us all the needed packages
     18     storeContents = [ pseudofiles ];
     19   };
     20 in
     21 runCommand "frob-squashfs"
     22   {
     23     nativeBuildInputs = with buildPackages; [
     24       squashfsTools
     25       qprint
     26     ];
     27   }
     28   ''
     29     cp ${storefs} ./store.img
     30     chmod +w store.img
     31     mksquashfs - store.img -exit-on-error -no-recovery -quiet -no-progress  -root-becomes store -p "/ d 0755 0 0"
     32     mksquashfs - store.img -exit-on-error -no-recovery -quiet -no-progress  -root-becomes nix  -p "/ d 0755 0 0" -pf ${pseudofiles}
     33     cp store.img $out
     34   ''