52 lines
1.8 KiB
Nix
52 lines
1.8 KiB
Nix
# Create an initial ramdisk containing the closure of the specified
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# file system objects. An initial ramdisk is used during the initial
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# stages of booting a Linux system. It is loaded by the boot loader
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# along with the kernel image. It's supposed to contain everything
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# (such as kernel modules) necessary to allow us to mount the root
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# file system. Once the root file system is mounted, the `real' boot
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# script can be called.
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#
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# An initrd is really just a gzipped cpio archive.
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#
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# Symlinks are created for each top-level file system object. E.g.,
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# `contents = {object = ...; symlink = /init;}' is a typical
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# argument.
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{ stdenvNoCC, perl, cpio, contents, ubootTools
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, name ? "initrd"
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, compressor ? "gzip -9n"
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, prepend ? []
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, lib
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}:
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let
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# !!! Move this into a public lib function, it is probably useful for others
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toValidStoreName = x: with builtins;
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lib.concatStringsSep "-" (filter (x: !(isList x)) (split "[^a-zA-Z0-9_=.?-]+" x));
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in stdenvNoCC.mkDerivation rec {
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inherit name;
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builder = ./make-initrd.sh;
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makeUInitrd = stdenvNoCC.hostPlatform.platform.kernelTarget == "uImage";
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nativeBuildInputs = [ perl cpio ]
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++ stdenvNoCC.lib.optional makeUInitrd ubootTools;
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# !!! should use XML.
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objects = map (x: x.object) contents;
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symlinks = map (x: x.symlink) contents;
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suffices = map (x: if x ? suffix then x.suffix else "none") contents;
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# For obtaining the closure of `contents'.
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# Note: we don't use closureInfo yet, as that won't build with nix-1.x.
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# See #36268.
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exportReferencesGraph =
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lib.zipListsWith
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(x: i: [("closure-${toValidStoreName (baseNameOf x.symlink)}-${toString i}") x.object])
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contents
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(lib.range 0 (lib.length contents - 1));
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pathsFromGraph = ./paths-from-graph.pl;
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inherit compressor prepend;
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}
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