nixpkgs/boot/boot-stage-1.nix

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# This Nix expression builds the script that performs the first stage
# of booting the system: it loads the modules necessary to mount the
# root file system, then calls /init in the root file system to start
# the second boot stage. The closure of the result of this expression
# is supposed to be put into an initial RAM disk (initrd).
{ substituteAll, staticShell, staticTools
, module_init_tools, extraUtils, modules, modulesDir
, # Whether to find root device automatically using its label.
autoDetectRootDevice
, # If not scanning, the root must be specified explicitly.
rootDevice
# If scanning, we need a disk label.
, rootLabel
, # The path of the stage 2 init to call once we've mounted the root
# device.
stage2Init ? "/init"
}:
substituteAll {
src = ./boot-stage-1-init.sh;
isExecutable = true;
inherit staticShell modules modulesDir;
inherit autoDetectRootDevice;
rootDevice = if !autoDetectRootDevice then rootDevice else "";
rootLabel = if autoDetectRootDevice then rootLabel else "";
path = [
staticTools
module_init_tools
extraUtils
];
makeDevices = ./make-devices.sh;
# We only want the path of the stage 2 init, we don't want it as a
# dependency (since then it the stage 2 init would end up in the
# initrd).
stage2Init = toString stage2Init; # !!! doesn't work
}