mirror of
https://github.com/NixOS/mobile-nixos.git
synced 2024-09-11 03:55:23 +03:00
boot/init: SwitchRoot: prep for stage-0 deprecation
For now, only moves the code to make it obvious which parts are for stage-0.
This commit is contained in:
Samuel Dionne-Riel
parent
cbc35593db
commit
1e06638c17
@ -22,6 +22,137 @@ class Tasks::SwitchRoot < SingletonTask
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end
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end
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# Extracted bits for stage-0 support.
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# This should make deprecating and removing easier down the line.
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module StageZeroSupport
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# Returns whether the current boot will `kexec` into the generation.
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def will_kexec?()
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# Only stage-0 bootloader-flavoured init will kexec.
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return false unless STAGE == 0
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# The user wants to use the generation's kernel
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return false unless @use_generation_kernel
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# AND if we find the required files.
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[
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"initrd",
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"kernel",
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"kernel-params",
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]
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.map { |file| generation_file(file) }
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.map { |file| File.exist?(file) }
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.all?
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end
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def kexec_in_generation(selected_generation)
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if Tasks.constants.include?(:SetupGadgetMode)
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Progress.exec_with_message("Tearing down USB Gadget mode") do
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begin
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Tasks::SetupGadgetMode.instance.teardown()
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rescue => e
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$logger.fatal("Caught an error during teardown for kexec...")
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$logger.fatal(e.inspect)
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end
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end
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end
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log("About to kexec...")
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System.run(
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"kexec", "--load",
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generation_file("kernel"),
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"--initrd=#{generation_file("initrd")}",
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*[maybe_dtb()].compact(),
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"--command-line",
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[
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["init", selected_generation.path("init", readlink: true)].join("="),
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# Flag used to describe we're in a kexec situation.
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# For the time being, the flag is the whole string, not the value yes to that key.
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"mobile-nixos.kexec=yes",
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"mobile-nixos.generation=#{selected_generation.path}",
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File.read(generation_file("kernel-params")),
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].join(" ")
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)
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System.exec("kexec", "-e")
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# Execution shouldn't reach here, as `exec` replaces this process with `kexec`.
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ensure
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raise "Failed to kexec into #{selected_generation.path}"
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end
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# If the system build exports a DTB file name to load, return the appropriate
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# command-line argument for `kexec`. Otherwise nil.
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def maybe_dtb()
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log("Looking for a DTB file...")
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mapping_path = generation_file("mobile-nixos/dtb-mapping.json", missing_allowed: true)
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unless mapping_path && File.exist?(mapping_path)
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log(" DTB: dtb-mapping.json not found... skipping DTB mapping...")
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return nil
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end
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log(" DTB: Mappings from: `#{mapping_path}`...")
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mapping = JSON.parse(File.read(mapping_path))
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# Work only off the first compatible name.
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# It is assumed that the loader uses the exact same scheme as the kernel
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# build does. If this assumption stops holding true, it will be a new
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# feature to implement.
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board_compatible = File.read("/proc/device-tree/compatible").split("\0").first
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log(" DTB: board_compatible: #{board_compatible}")
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desired_dtb = mapping[board_compatible]
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if desired_dtb
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log(" DTB: wants: #{desired_dtb}")
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else
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log(" DTB: no DTB mapping found for #{board_compatible}...")
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return nil
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end
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# The desired_dtb path is an absolute path in the mounted system.
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file = File.join(SYSTEM_MOUNT_POINT, desired_dtb)
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if File.exist?(file)
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log(" DTB: file `#{file}` found")
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"--dtb=#{forward_fdt_bootloader_info(file)}"
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else
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log(" DTB: file `#{file}` not found... skipping DTB mapping")
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nil
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end
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end
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# Given a path to a DTB file, merges required properties that the bootloader
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# has setup. It will additionally merge optional properties.
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def forward_fdt_bootloader_info(path)
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args = [
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"--print-header",
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"--copy-dtb", path,
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Configuration["stage-0"]["forward"]["nodes"].map {|path| [ "--forward-node", path] },
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Configuration["stage-0"]["forward"]["props"].map {|pair| [ "--forward-prop", *pair] },
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].flatten
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log(" $ fdt-forward #{args.shelljoin}")
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dts = `fdt-forward #{args.shelljoin}`
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# Declare we booted using stage-0's kexec
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# And additional useful debugging data...
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dts << [
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"\n",
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"// Declare we booted using kexec",
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%Q{/ { mobile-nixos,stage-0; };},
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%Q{/ { mobile-nixos,stage-0,timestamp = #{Time.now.to_s.to_json}; };},
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%Q{/ { mobile-nixos,stage-0,uname = #{`uname -a`.to_json}; };},
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%Q{/ { mobile-nixos,stage-0,uptime = #{`uptime`.to_json}; };},
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].join("\n")
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FileUtils.mkdir_p("/run/boot/")
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File.write("/run/boot/fdt.dts", dts)
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System.run("fdt-forward --to-dtb < /run/boot/fdt.dts > /run/boot/fdt.dtb")
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return "/run/boot/fdt.dtb"
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end
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end
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include StageZeroSupport
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# Where the system rootfs will be mounted.
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SYSTEM_MOUNT_POINT = "/mnt"
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@ -238,95 +369,6 @@ class Tasks::SwitchRoot < SingletonTask
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@selected_generation
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end
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# If the system build exports a DTB file name to load, return the appropriate
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# command-line argument for `kexec`. Otherwise nil.
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def maybe_dtb()
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log("Looking for a DTB file...")
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mapping_path = generation_file("mobile-nixos/dtb-mapping.json", missing_allowed: true)
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unless mapping_path && File.exist?(mapping_path)
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log(" DTB: dtb-mapping.json not found... skipping DTB mapping...")
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return nil
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end
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log(" DTB: Mappings from: `#{mapping_path}`...")
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mapping = JSON.parse(File.read(mapping_path))
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# Work only off the first compatible name.
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# It is assumed that the loader uses the exact same scheme as the kernel
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# build does. If this assumption stops holding true, it will be a new
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# feature to implement.
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board_compatible = File.read("/proc/device-tree/compatible").split("\0").first
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log(" DTB: board_compatible: #{board_compatible}")
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desired_dtb = mapping[board_compatible]
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if desired_dtb
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log(" DTB: wants: #{desired_dtb}")
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else
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log(" DTB: no DTB mapping found for #{board_compatible}...")
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return nil
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end
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# The desired_dtb path is an absolute path in the mounted system.
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file = File.join(SYSTEM_MOUNT_POINT, desired_dtb)
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if File.exist?(file)
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log(" DTB: file `#{file}` found")
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"--dtb=#{forward_fdt_bootloader_info(file)}"
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else
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log(" DTB: file `#{file}` not found... skipping DTB mapping")
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nil
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end
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end
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# Given a path to a DTB file, merges required properties that the bootloader
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# has setup. It will additionally merge optional properties.
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def forward_fdt_bootloader_info(path)
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args = [
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"--print-header",
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"--copy-dtb", path,
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Configuration["stage-0"]["forward"]["nodes"].map {|path| [ "--forward-node", path] },
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Configuration["stage-0"]["forward"]["props"].map {|pair| [ "--forward-prop", *pair] },
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].flatten
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log(" $ fdt-forward #{args.shelljoin}")
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dts = `fdt-forward #{args.shelljoin}`
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# Declare we booted using stage-0's kexec
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# And additional useful debugging data...
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dts << [
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"\n",
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"// Declare we booted using kexec",
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%Q{/ { mobile-nixos,stage-0; };},
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%Q{/ { mobile-nixos,stage-0,timestamp = #{Time.now.to_s.to_json}; };},
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%Q{/ { mobile-nixos,stage-0,uname = #{`uname -a`.to_json}; };},
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%Q{/ { mobile-nixos,stage-0,uptime = #{`uptime`.to_json}; };},
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].join("\n")
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FileUtils.mkdir_p("/run/boot/")
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File.write("/run/boot/fdt.dts", dts)
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System.run("fdt-forward --to-dtb < /run/boot/fdt.dts > /run/boot/fdt.dtb")
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return "/run/boot/fdt.dtb"
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end
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def will_kexec?()
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# Only stage-0 bootloader-flavourd init will kexec.
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return false unless STAGE == 0
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# The user wants to use the generation's kernel
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return false unless @use_generation_kernel
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# AND if we find the required files.
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[
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"initrd",
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"kernel",
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"kernel-params",
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]
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.map { |file| generation_file(file) }
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.map { |file| File.exist?(file) }
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.all?
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end
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def generation_file(name, missing_allowed: false)
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begin
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selected_generation.mounted_path(name, readlink: true)
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@ -359,38 +401,7 @@ class Tasks::SwitchRoot < SingletonTask
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log("***")
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log("")
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if will_kexec?
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if Tasks.constants.include?(:SetupGadgetMode)
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Progress.exec_with_message("Tearing down USB Gadget mode") do
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begin
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Tasks::SetupGadgetMode.instance.teardown()
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rescue => e
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$logger.fatal("Caught an error during teardown for kexec...")
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$logger.fatal(e.inspect)
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end
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end
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end
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log("About to kexec...")
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System.run(
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"kexec", "--load",
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generation_file("kernel"),
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"--initrd=#{generation_file("initrd")}",
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*[maybe_dtb()].compact(),
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"--command-line",
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[
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["init", selected_generation.path("init", readlink: true)].join("="),
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# Flag used to describe we're in a kexec situation.
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# For the time being, the flag is the whole string, not the value yes to that key.
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"mobile-nixos.kexec=yes",
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"mobile-nixos.generation=#{selected_generation.path}",
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File.read(generation_file("kernel-params")),
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].join(" ")
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)
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System.exec("kexec", "-e")
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raise "Failed to kexec into #{selected_generation.path}"
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end
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kexec_in_generation(selected_generation) if will_kexec?
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Tasks::UDev.instance.teardown()
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