omnect-os-init

Rust-based init process for omnect-os initramfs.

Overview

A single binary acting as /init in the initramfs, in place of the shell scripts that used to do this. Runs as PID 1: it prepares the partitions, the boot environment and the runtime state for omnect-device-service, then hands over with switch_root.

How to use it on a device (flash modes, factory reset, filesystem check, status file) is described in docs/usage.md.

Implemented functionality:

Bootloader abstraction: BootEnv trait for GRUB (grub-editenv) and U-Boot (fw_printenv/fw_setenv)
Degraded boot mode: a release image continues to boot without a usable bootloader environment and reports it; a debug image stops and opens a shell
Configuration: parses /proc/cmdline; build-time constants from the Yocto environment via build.rs
Partition management: root device detection, partition layout (GPT/DOS), /dev/omnect/* symlinks
Filesystem operations: fsck, mount manager, overlayfs for /etc and /home, bind mounts
Logging: kernel ring buffer (/dev/kmsg) with log level prefixes
ODS integration: status file and update validation files for omnect-device-service
fs-links: symlinks from etc/omnect/fs-link.json, etc/omnect/fs-link.d/ and the one-time list etc/omnect/create-fs-links.txt
switch_root: MS_MOVE + chroot + exec systemd
Factory reset (modes 1-3) (feature factory-reset)
Flash modes 1-3 (features flash-mode-1, flash-mode-2, flash-mode-3)
Early module load (feature early-modules)

Startup Flow

The diagram traces every phase from PID 1 start to switch_root. The release-image feature flag determines the error-handling branch at each fatal failure point.

flowchart TD
    START([PID 1 starts]) --> MOUNT_ESS["mount_essential_filesystems\n/dev · /proc · /sys · /run"]

    MOUNT_ESS -->|OK| LOGGER["KmsgLogger::init()"]
    MOUNT_ESS -->|Fail| EARLY_ERR{Image type?}
    EARLY_ERR -->|release| HALT1(["🔴 eprintln loop — halt"])
    EARLY_ERR -->|debug| ESHELL(["🐚 emergency sh — respawn"])

    LOGGER -->|OK| CONFIG["Config::load()\n/proc/cmdline"]
    LOGGER -->|Fail| FEB

    CONFIG -->|OK| RDEV["detect_root_device()"]
    CONFIG -->|Fail| FEB

    RDEV -->|OK| LAYOUT["PartitionLayout::new()\ncreate_omnect_symlinks()"]
    RDEV -->|Fail| FEB

    LAYOUT -->|OK| CORE["mount_core_partitions()\nrootfs + boot + fsck"]
    LAYOUT -->|Fail| FEB

    CORE --> BENV["open_boot_env()"]

    BENV --> CLASSIFY{"classify_boot_env"}
    CLASSIFY -->|"OK → Available"| APPLY["apply_boot_env_decision()\ncore_result × env decision\npersist_fsck_results — always"]
    CLASSIFY -->|"Fail + release → Degraded"| APPLY
    CLASSIFY -->|"Fail + debug → Abort"| FEB

    APPLY -->|Fatal| FEB
    APPLY -->|"OK\nDegraded: ods.degraded_boot=true"| FBDETECT["set_update_pending()\ndetect_first_boot()\nfalse on a boot after an update"]

    FBDETECT --> BMODE{"BootMode::detect()"}
    BMODE -->|"Fatal: flash mode 1 and factory reset\nboth queued (both cleared)"| FEB
    BMODE -->|"Flash(config)\nfeature = flash-mode"| FLASH
    BMODE -->|"Normal / FactoryReset"| ISETUP["init_setup::run()\nextra_bootargs sync — always\nresize-data preflight if feature = resize-data"]

    FLASH["flash::run()\nclear flash triggers → clone (mode 1), scp flash (mode 2)\nor download flash (mode 3)\nrun log → data partition"]
    FLASH -->|OK| POWEROFF(["⏻ poweroff (mode 1) / reboot (modes 2, 3)"])
    FLASH -->|Fatal| FEB

    ISETUP -->|"FsckRequiresReboot\nExtraBootArgsUpdated"| FEB
    ISETUP -->|"ResizeData error\nContinueDegraded — warn"| EMOD["early_modules::load()\nfeature = early-modules\nbest effort, never fails"]
    ISETUP -->|"Fatal (non-resize)"| FEB
    ISETUP -->|OK| EMOD
    EMOD --> DISPATCH{"dispatch mode"}

    DISPATCH -->|Normal| MREM["mount_remaining_partitions()\ndata · factory · cert + fsck\npersist_fsck_results — always"]
    DISPATCH -->|"FactoryReset(trigger)\nfeature = factory-reset"| FCLEAR

    subgraph FRESET["factory_reset::run() — always ContinueDegraded"]
        direction TB
        FCLEAR["clear factory-reset\nbootloader var (best-effort)"] --> FMOUNT["mount factory(ro) + etc(rw) + data(rw)\n+ overlays"]
        FCLEAR -->|"trigger unusable"| FSTATUS
        FMOUNT --> FBACKUP["build_preserve_list()\nbackup_all() → /tmp/factory_reset/backup"]
        FBACKUP --> FUMOUNT1["umount"]
        FUMOUNT1 --> FWIPE["wipe_partitions()\nmode 2: random overwrite · mode 3: discard\nmode 1: skipped · failure never aborts"]
        FWIPE --> FFORMAT["reformat_and_mount_with_retry()\nmkfs data/etc (1 retry each, warn on fail)\nthen mount once — the deciding step"]
        FFORMAT -->|"mount ok"| FRESTORE["restore_all()"]
        FFORMAT -->|"mount fails on data/etc"| FSIGNAL["record failure signal\n→ bootloader env (in run())"]
        FRESTORE --> FUMOUNT2["umount"]
        FUMOUNT2 --> FSTATUS["ods_status.set_factory_reset(...)\nsuccess or error — never blocks boot"]
        FSIGNAL --> FSTATUS
    end
    FSTATUS --> MREM

    MREM -->|FsckRequiresReboot| FEB
    MREM -->|Fatal| FEB
    MREM -->|OK| OVL["setup_raw_rootfs_mount()\nsetup_etc_overlay()\nsetup_data_overlay()"]

    OVL -->|OK| LINKS["create_fs_links()\ndrain_fsck_env() — env → JSON, then clear\ncreate_ods_runtime_files()\nsets the first-boot marker after an update"]
    OVL -->|Fail| FEB

    LINKS -->|OK| FBM["write_first_boot_marker()\nif first_boot ∧ resize_ok ∧ extra_bootargs_ok ∧ env_available\nbest-effort — warn on fail"]
    LINKS -->|Fail| FEB

    FBM --> SR["switch_root → systemd"]
    SR -->|OK| SUCCESS(["✅ systemd running"])
    SR -->|Fail| FEB

    FEB{"Error handler\nRecoveryClass?"}
    FEB -->|"RebootToApply (e.g. FsckRequiresReboot)"| REBOOT(["🔁 Reboot"])
    FEB -->|"Fatal + update_pending"| REBOOT
    FEB -->|"Fatal + no update + release"| HALT2(["🔴 kmsg loop — halt forever"])
    FEB -->|"Fatal + no update + debug"| DSHELL(["🐚 debug bash/sh — respawn"])

    classDef success fill:#2d6a2d,color:#fff,stroke:#1a3d1a
    classDef reboot fill:#1a4d7a,color:#fff,stroke:#0d2d4d
    classDef halt fill:#7a1a1a,color:#fff,stroke:#4d0d0d
    classDef shell fill:#7a4a1a,color:#fff,stroke:#4d2d0d

    class SUCCESS,POWEROFF success
    class REBOOT reboot
    class HALT1,HALT2 halt
    class ESHELL,DSHELL shell

Terminal states

Symbol	Outcome	Trigger
✅	`switch_root` — systemd takes over	Normal completion
⏻	Power off	Flash mode 1 finished; the clone can be moved to its own device
🔁	Reboot	Flash mode 2 or 3 finished; `FsckRequiresReboot` (unconditional); `ExtraBootArgsUpdated` (first boot, new extra boot arguments); or any fatal error while `omnect_validate_update` is set — triggers bootloader OTA rollback
🔴	Halt (kmsg loop, infinite)	Fatal error · release image · no OTA in flight
🐚	Debug shell (bash → sh fallback, respawning)	Fatal error · debug image · no OTA in flight

Notes on error handling

All errors from run_init() reach handle_fatal_error in main.rs, which dispatches on RecoveryClass:

RebootToApply (e.g. FsckRequiresReboot) → always Reboot, regardless of image type
Fatal + omnect_validate_update set → Reboot (bootloader OTA rollback)
Fatal + no OTA in flight + release → Halt (kmsg loop)
Fatal + no OTA in flight + debug → debug shell

FsckRequiresReboot edges in the diagram flow through this handler.

Notes on overlay, fs-link, and ODS setup (OVL / LINKS blocks)

These steps (setup_raw_rootfs_mount, setup_etc_overlay, setup_data_overlay, create_fs_links, create_ods_runtime_files) abort the boot on any failure: the error reaches handle_fatal_error, which halts the device on a release image, drops to a debug shell on a debug image, or reboots when an OTA update is in flight (update_pending). No dedicated design spec covers this region.

Notes on apply_boot_env_decision

mount_core_partitions result is captured rather than propagated immediately so that fsck diagnostics can be persisted to the bootloader environment before the error propagates. apply_boot_env_decision propagates an error from mount_core_partitions before a concurrent DegradedBoot — the two can occur together when GRUB's boot partition is unmountable. persist_fsck_results runs on every mount path, including degraded boot.

Notes on factory reset (FRESET block)

Enabled by the factory-reset feature. BootMode::detect() reads the factory-reset bootloader env key; any non-blank value dispatches to mode::factory_reset::run() instead of mode::normal::run(). A blank value is not a request to reset. A trigger can be cleared two ways — by unsetting the key, or by writing an empty value — and the two backends disagree about the second: fw_printenv reports an empty variable as unset, while grub-editenv still lists the key. On GRUB a cleared trigger can therefore come back as a present but empty value, so treating blank as no trigger makes both backends behave the same and keeps such a device from being answered with a reset failure nobody asked for. A value the init cannot use is cleared and reported there — status 1 when it does not name a mode the init can run, unparsable json included, status 3 when the problem is preserve — rather than booting on in silence, which would leave the caller waiting for a result forever. The reset sequence (mount → backup → wipe → reformat → mount → restore) always completes with a FactoryResetStatus recorded in the ODS status JSON — success or error — and then falls through into the same mode::normal::run() path a normal boot takes (MREM onward), so a failed or unsupported reset never blocks the device from booting: FactoryResetError is classified as ContinueDegraded.

Factory reset — wipe modes (FWIPE)

The behaviour is described in factory reset. A factory-reset.d file without a usable paths array fails the reset, because skipping it would wipe the paths it was meant to keep and still report success.

The wipe runs once the backup is in initramfs RAM and before the reformat. Mode 2 writes data from /dev/urandom, mode 3 uses the BLKDISCARD ioctl, which the hardware has to support. A failed wipe is reported as Error but does not abort the reset, so the device stays usable.

Factory reset — reformat/mount retry (FFORMAT)

Inside reformat_and_mount_with_retry, each of data/etc is mkfs'd with one retry on failure. The mount is then attempted once and decides the outcome: even after two failed mkfs attempts the mount is still tried, since the filesystem may be usable. A mount failure on data/etc is recorded as a bootloader-env signal (omnect_factory_reset_last_error), so even if the following Normal boot halts on the same partition the cause is still readable (fw_printenv / grub-editenv list). A mount failure is not re-mkfs'd — a repeated mkfs would produce the same filesystem the mount just rejected.

flowchart TD
    RF["mkfs(data), mkfs(etc)\none retry each on failure\nwarn! on every mkfs failure"] --> MNT{"mount + overlays\n(once)"}
    MNT -->|ok| OKP["reset proceeds\nrestore → boot"]
    MNT -->|"fails on data/etc"| SIG["write bootloader-env signal\nomnect_factory_reset_last_error"]
    SIG --> GIVEUP["give up → Normal boot\n→ Fatal → halt (diagnosable)"]
    MNT -->|"fails on factory/unknown"| PROP["propagate error\nno signal"]

mkfs	mount	2nd mkfs?	`warn!`	bootloader signal	ODS status	boot
ok	ok	no	no	no	`Success`	normal
1× fail, then ok	ok	yes	yes	no	`Warning` + note	normal
2× fail	ok	yes	yes	no	`Error` + note	normal
2× fail	fails	yes	yes	yes	`Error`	halt
ok	fails (data/etc)	no	yes	yes	`Error`	halt

The mkfs history is reported in the ODS status even when the mount succeeds: a recovered single failure is Warning, two failures are Error — an early sign of failing storage.

Building

# A bootloader and a partition table are both mandatory; build.rs rejects
# any other combination
cargo build --features grub,gpt      # x86-64 EFI targets
cargo build --features uboot,gpt     # ARM targets (dos applies too)

# Release build (optimized for size); U-Boot targets use gpt or dos
cargo build --release --features grub,gpt
cargo build --release --features uboot,gpt
cargo build --release --features uboot,dos

# With additional optional features
cargo build --release --features grub,gpt,factory-reset,persistent-var-log

Features

Feature	Description	Status
`core`	Core boot sequence (default)	Implemented
`grub`	GRUB bootloader support — x86-64 EFI targets	Implemented
`uboot`	U-Boot bootloader support — ARM targets	Implemented
`gpt`	GPT partition table layout	Implemented
`dos`	DOS/MBR partition table layout	Implemented
`early-modules`	Load the modules listed in the rootfs before `switch_root`, see Early module load	Implemented
`persistent-var-log`	Bind-mount `/var/log` to data partition	Implemented
`release-image`	Release error handling: loop on fatal error; continue in degraded boot	Implemented
`resize-data`	Data partition auto-resize on first boot	Implemented
`test-utils`	Expose `MockBootEnv` for integration tests (never enabled in production)	Test only
`factory-reset`	Factory reset support (modes 1-3: selective-preserve backup → wipe → reformat → restore)	Implemented
`flash-mode`	Shared flash layer: trigger detection, dispatch, log capture. Pulled in by a mode feature, never selected on its own	Implemented
`flash-mode-1`	Disk cloning (part of the default feature set)	Implemented
`flash-mode-2`	Flash a `wic.xz` pushed in over `scp`	Implemented
`flash-mode-2-direct`	Implies `flash-mode-2`; no verify pass, flashes straight from the `scp` stream	Implemented
`flash-mode-3`	Flash a `wic.xz` downloaded from a URL	Implemented
`flash-mode-network`	Shared layer of modes 2 and 3: network, unmount sweep, xz decoding. Pulled in by a mode feature, never selected on its own	Implemented
`rtc`	The machine has a reliable real-time clock, so mode 3 checks TLS certificates; without it, mode 3 does not authenticate the server	Implemented

Note: grub and uboot are mutually exclusive, and so are gpt and dos. Exactly one of each pair must be set at build time — build.rs panics otherwise. The Yocto recipe sets CARGO_FEATURES from MACHINE_FEATURES, DISTRO_FEATURES and recipe variables; see the meta-omnect README. flash-mode-1 is in the default feature set, so it is already enabled in the cargo build examples above; add --no-default-features to build without it.

Build constants

build.rs reads these Yocto environment variables. The build does not fail without them, but a flash mode that needs a missing value refuses to run. A value that is not a number is ignored with a cargo warning.

Env var	Constant	Unit	Needed by
`OMNECT_PART_OFFSET_UBOOT_ENV1`	`UBOOT_ENV1_START`	KiB	`flash-mode-1` with `uboot`; with `grub` only when `BOOTLOADER_SEEK` is set
`OMNECT_PART_OFFSET_UBOOT_ENV2`	`UBOOT_ENV2_START`	KiB	`flash-mode-1` with `uboot`, optional
`OMNECT_PART_SIZE_UBOOT_ENV`	`UBOOT_ENV_SIZE`	KiB	`flash-mode-1` with `uboot`
`OMNECT_PART_SIZE_DATA`	`DATA_SIZE`	KiB	`flash-mode-1`
`BOOTLOADER_SEEK`	`BOOTLOADER_START`	KiB	`flash-mode-1`, optional
`OMNECT_PART_OFFSET_BOOT`	`BOOT_START`	KiB	`flash-mode-2`
`OMNECT_PART_SIZE_BOOT`	`BOOT_SIZE`	KiB	`flash-mode-2`
`OMNECT_USER_ID`	`OMNECT_USER_ID`	uid and gid of the `omnect` user	`flash-mode-2`

Runtime Dependencies

The init calls these tools and reads these files from the initramfs image. The image recipe has to install them, or the step that needs them fails at run time. The paths are the *_CMD and *_SOURCE constants in the source, plus files the called tools need.

Tool or file	Needed by	Yocto package
`fsck`	`core`	`util-linux-fsck`
`fsck.ext4` backend (`e2fsck`)	`core`	`e2fsprogs-e2fsck`
`fsck.vfat` backend	`core` (boot partition)	`dosfstools`
`blkid`	`core`	`util-linux-blkid`
`gzip`, `gunzip`	`core` (fsck output in the bootloader env)	`busybox`
`base64`, `cp`	`core`	`coreutils`
`bash`	debug shell	`bash`
`sh`	emergency shell, fallback of the debug shell, shell of the `omnect` user for `scp`	`bash`
`grub-editenv`	`grub`	`grub-editenv`
`fw_printenv`, `fw_setenv`	`uboot`	`libubootenv-bin`
`/etc/fw_env.config`	`uboot`	`libubootenv`
`mkfs.ext4`, `tune2fs`	`factory-reset`, `flash-mode-1`	`e2fsprogs-mke2fs`, `e2fsprogs-tune2fs`
`sync`	`factory-reset`, `resize-data`	`coreutils`
`sgdisk`, `parted`, `resize2fs`	`resize-data`	`gptfdisk`, `parted`, `e2fsprogs-resize2fs`
`sfdisk`	`flash-mode-1`	`util-linux-sfdisk`
`e2image`	`flash-mode-1`	`e2fsprogs`
`fatlabel`	`flash-mode-1` with `grub`	`dosfstools`
`efibootmgr`	`flash-mode-1`, `flash-mode-2`, `flash-mode-3` on EFI machines	`efibootmgr`
`efivarfs` filesystem	`flash-mode-1`, `flash-mode-2`, `flash-mode-3` on EFI machines	kernel (`CONFIG_EFIVAR_FS`)
`/etc/omnect/grubenv.in`	`flash-mode-1` with `grub`	`grub-env`
`/etc/omnect/uboot-env.bin`	`flash-mode-1` with `uboot`	image recipe (`add_uboot_env`)
`/sbin/ip`	`flash-mode-2`, `flash-mode-3`	`busybox`
`/sbin/dhcpcd`	`flash-mode-2`, `flash-mode-3`	`dhcpcd`, `base-passwd` for its system user
`/sbin/dropbear`, `scp`	`flash-mode-2`	`dropbear`
`omnect` user and `/home/omnect`	`flash-mode-2`	image recipe (`inherit omnect_user`)
`devpts` filesystem	`flash-mode-2`	kernel (`CONFIG_UNIX98_PTYS`)
`/usr/bin/curl`	`flash-mode-3`	`curl`
CA certificates	`flash-mode-3`, checked only with `rtc`	`ca-certificates`

With early-modules, the init also reads files from the rootfs, see Early module load.

Testing

# All four valid base combinations (bootloader × partition table)
# test-utils is required for the degraded_boot integration test; factory_reset
# needs the factory-reset feature as well, see the next block
cargo test --features grub,gpt,test-utils
cargo test --features grub,dos,test-utils
cargo test --features uboot,gpt,test-utils
cargo test --features uboot,dos,test-utils

# With factory-reset feature
cargo test --features grub,gpt,factory-reset,test-utils
cargo test --features grub,dos,factory-reset,test-utils
cargo test --features uboot,gpt,factory-reset,test-utils
cargo test --features uboot,dos,factory-reset,test-utils

# With resize-data feature
cargo test --features grub,gpt,resize-data,test-utils
cargo test --features grub,dos,resize-data,test-utils
cargo test --features uboot,gpt,resize-data,test-utils
cargo test --features uboot,dos,resize-data,test-utils

# With persistent-var-log feature
cargo test --features grub,gpt,persistent-var-log,test-utils
cargo test --features uboot,dos,persistent-var-log,factory-reset,test-utils

# With early-modules feature
cargo test --features grub,gpt,early-modules,test-utils
cargo test --features uboot,gpt,early-modules,test-utils

# With release-image feature
cargo test --features grub,gpt,release-image,test-utils
cargo test --features grub,dos,release-image,test-utils
cargo test --features uboot,gpt,release-image,test-utils
cargo test --features uboot,dos,release-image,test-utils

# With both resize-data and release-image
cargo test --features grub,gpt,resize-data,release-image,test-utils
cargo test --features uboot,gpt,resize-data,release-image,test-utils

# flash-mode-1 is in the default feature set, so every combination above
# already builds and tests it; the factory-reset ones also cover the refusal
# of flash mode 1 queued together with a factory reset.

# Without any flash feature: flash-mode-1 is in the default set, so
# --no-default-features is required to exclude it; --features alone is
# additive and cannot turn a default feature off
cargo test --no-default-features --features grub,gpt,factory-reset,test-utils

# Flash mode 2 (mode-2-only build)
cargo test --no-default-features --features core,grub,gpt,flash-mode-2,test-utils
cargo test --no-default-features --features core,grub,dos,flash-mode-2,test-utils
cargo test --no-default-features --features core,uboot,gpt,flash-mode-2,test-utils
cargo test --no-default-features --features core,uboot,dos,flash-mode-2,test-utils
cargo test --no-default-features --features core,uboot,gpt,flash-mode-2-direct,test-utils
cargo test --no-default-features --features core,grub,gpt,flash-mode-2-direct,test-utils

# Flash mode 3 (mode-3-only build), also with a real-time clock; two download tests run the
# host's /usr/bin/curl and fail without it
cargo test --no-default-features --features core,grub,gpt,flash-mode-3,test-utils
cargo test --no-default-features --features core,grub,dos,flash-mode-3,test-utils
cargo test --no-default-features --features core,uboot,gpt,flash-mode-3,test-utils
cargo test --no-default-features --features core,uboot,dos,flash-mode-3,test-utils
cargo test --no-default-features --features core,uboot,gpt,flash-mode-3,rtc,test-utils

# Flash modes together
cargo test --features uboot,gpt,flash-mode-1,flash-mode-2,factory-reset,test-utils
cargo test --no-default-features --features core,uboot,gpt,flash-mode-2,flash-mode-3,test-utils
cargo test --features uboot,gpt,flash-mode-3,factory-reset,test-utils
cargo test --features grub,gpt,flash-mode-1,flash-mode-2,flash-mode-3,factory-reset,test-utils

# Lint without --tests too: dev-dependencies enable crate features that the
# release build does not have
cargo clippy --no-default-features --features core,uboot,gpt,flash-mode-2,flash-mode-3 -- -D warnings

# Verbose output
cargo test --features grub,gpt,test-utils -- --nocapture

flash-mode or flash-mode-network alone, without a mode feature, is not a supported configuration — no combination above builds it that way, and no gate covers it.

Some U-Boot targets are 32-bit ARM, where usize is 4 bytes and a cast from a 64-bit byte count silently truncates. The test run above is host-only and cannot see that, so compile and lint for a 32-bit target as well (cargo check and cargo clippy need no cross-linker):

rustup target add armv7-unknown-linux-gnueabihf
cargo clippy --target armv7-unknown-linux-gnueabihf --tests \
  --features uboot,dos,factory-reset,test-utils -- -D warnings

# Run the tests on a 32-bit host target (needs no cross-linker on x86-64)
rustup target add i686-unknown-linux-gnu
cargo test --target i686-unknown-linux-gnu --no-default-features \
  --features core,uboot,dos,flash-mode-2,flash-mode-3,test-utils

# Narrowing casts, reviewed by hand — not part of the gate, it also flags safe ones
cargo clippy --target armv7-unknown-linux-gnueabihf \
  --features uboot,dos,factory-reset -- -W clippy::cast_possible_truncation

License

MIT OR Apache-2.0

Name		Name	Last commit message	Last commit date
docs		docs
src		src
tests		tests
.gitignore		.gitignore
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
README.md		README.md
build.rs		build.rs
project-context.md		project-context.md
rust-toolchain.toml		rust-toolchain.toml

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