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mirror of https://github.com/NixOS/mobile-nixos.git synced 2024-12-17 21:11:34 +03:00
mobile-nixos/boot/init/tasks/switch_root.rb
2020-02-03 16:19:10 -05:00

62 lines
1.5 KiB
Ruby

class Tasks::SwitchRoot < SingletonTask
# Relative to root.
SYSTEM_LINK = "/nix/var/nix/profiles/system"
# Where the system will be mounted.
SYSTEM_MOUNT_POINT = "/mnt"
def initialize()
add_dependency(:Target, :SwitchRoot)
@target = SYSTEM_MOUNT_POINT
end
def find_generation()
# The default generation
if File.symlink?(File.join(@target, SYSTEM_LINK))
return SYSTEM_LINK
end
# Otherwise, we need to re-hydrate a system!
registration = File.join(@target, "nix-path-registration")
if File.exist?(registration)
path = File.read(registration)
.split("\n")
.grep(%r{^/nix/store/[a-z0-9]+-nixos-system-})
.first
return path if path
end
System.failure("init_not_found", "Could not find init path for stage-2", color: "FF00FF")
end
def run()
# TODO: Implement generation selection choice.
init = "#{find_generation}/init"
# This is the traditional way we printed the init path.
# This is still helpful to take vertical real estate when visually looking
# through the log.
log("")
log("***")
log("")
log("Switching root to #{init}")
log("")
log("***")
log("")
[
"/proc",
"/sys",
"/dev",
"/run",
].each do |mount_point|
new_location = File.join(@target, mount_point)
FileUtils.mkdir_p(new_location)
System.run("mount", "--move", mount_point, new_location)
end
switch_root = System.which("switch_root")
System.exec({}, switch_root, @target, init)
end
end