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btrfs.nix (875B)

      1 {
      2   config,
      3   pkgs,
      4   lib,
      5   ...
      6 }:
      7 let
      8   inherit (lib) mkIf;
      9   o = config.system.outputs;
     10 in
     11 {
     12   imports = [
     13     ./initramfs.nix
     14   ];
     15   config = mkIf (config.rootfsType == "btrfs") {
     16     kernel.config = {
     17       BTRFS_FS = "y";
     18     };
     19     boot.initramfs.enable = true;
     20     system.outputs = {
     21       rootfs =
     22         let
     23           inherit (pkgs.pkgsBuildBuild) runCommand e2fsprogs;
     24         in
     25         runCommand "mkfs.btrfs"
     26           {
     27             depsBuildBuild = [ e2fsprogs ];
     28           }
     29           ''
     30             tree=${o.bootablerootdir}
     31             size=$(du -s --apparent-size --block-size 1024 $tree |cut -f1)
     32             # add 25% for filesystem overhead
     33             size=$(( 5 * $size / 4))
     34             dd if=/dev/zero of=$out bs=1024 count=$size
     35             echo "not implemented" ; exit 1
     36             # mke2fs -t ext4 -j -d $tree $out
     37           '';
     38     };
     39   };
     40 }