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I've been working on some improvements and enhancements to the current systemd hook for mkinitcpio.
A quick rundown of my goals:
- Make it possible to fully replace base and udev hooks with this hook (which means being able to depend on a working emergency shell)
- Add missing files (including those needed for working Emergency and Rescue modes, including commands like `shutdown`, `reboot`, etc.)
- Improve code maintainability: fewer hard-coded unit files, more docs
- No password and group files in the initrd image by default, for security reasons
- Add support for drop-in snippets and presets to configure early boot
Optional, supporting hooks and packages may add functionality to:
- Add password and group files to the initrd if desired
- Load keyboard drivers if not compiled into the kernel
- Load a keyboard map (e.g. for password entry using a localized or non-QWERTY keyboard layout)
- Enable kbrequest action (Alt-UpArrow) to activate Rescue mode
For an annotated diff of my changes, please see: https://github.com/ackalker/mkinitcpio- … e8550bab7d
I have uploaded the package mkinitcpio-systemd-ng-git to the AUR for testing.
The systemd-ng hook should be able to replace both base and udev hooks.
Please let me know what you think of this. I hope these changes can somehow make it into Arch Linux official systemd package. Any suggestions and constructive criticism are very welcome.
Here is a diff of the output of `lsinitcpio -v` of an old an new initramfs image (sorted, with date column removed for easy comparison) which makes for a nice summary of the impact of my changes.
--- current systemd hook, replacing udev hook
+++ systemd-ng hook, replacing both base and udev hooks
--- lsinitcpio.out.old 2015-04-30 16:21:31.361298981 +0200
+++ lsinitcpio.out.new 2015-04-30 16:21:31.457964831 +0200
@@ -4 +4 @@
--rw-r--r-- 1 root root 2493 ./buildconfig
+-rw-r--r-- 1 root root 2491 ./buildconfig
@@ -9 +8,0 @@
--rw-r--r-- 1 root root 689 ./etc/group
@@ -11 +10 @@
--rw-r--r-- 1 root root 1747 ./etc/ld.so.cache
+-rw-r--r-- 1 root root 1739 ./etc/ld.so.cache
@@ -15,2 +13,0 @@
--rw-r--r-- 1 root root 234 ./etc/nsswitch.conf
--rw-r--r-- 1 root root 832 ./etc/passwd
@@ -18 +14,0 @@
--rw-r--r-- 1 root root 12469 ./init_functions
@@ -63 +59 @@
-lrwxrwxrwx 1 root root 7 ./usr/bin/halt -> busybox
+lrwxrwxrwx 1 root root 9 ./usr/bin/halt -> systemctl
@@ -75,0 +72 @@
+-rwxr-xr-x 1 root root 449896 ./usr/bin/journalctl
@@ -93 +90 @@
--rwxr-xr-x 1 root root 146576 ./usr/bin/modprobe
+lrwxrwxrwx 1 root root 4 ./usr/bin/modprobe -> kmod
@@ -105 +102 @@
-lrwxrwxrwx 1 root root 7 ./usr/bin/poweroff -> busybox
+lrwxrwxrwx 1 root root 9 ./usr/bin/poweroff -> systemctl
@@ -110 +107 @@
-lrwxrwxrwx 1 root root 7 ./usr/bin/reboot -> busybox
+lrwxrwxrwx 1 root root 9 ./usr/bin/reboot -> systemctl
@@ -121,0 +119 @@
+lrwxrwxrwx 1 root root 9 ./usr/bin/shutdown -> systemctl
@@ -126 +124 @@
--rwxr-xr-x 1 root root 14832 ./usr/bin/switch_root
+-rwxr-xr-x 1 root root 39976 ./usr/bin/sulogin
@@ -153,0 +152 @@
+-rwxr-xr-x 1 root root 39184 ./usr/lib/libcrypt.so.1
@@ -163,2 +161,0 @@
--rwxr-xr-x 1 root root 51712 ./usr/lib/libnss_files-2.21.so
-lrwxrwxrwx 1 root root 20 ./usr/lib/libnss_files.so.2 -> libnss_files-2.21.so
@@ -207,2 +204,2 @@
-drwxr-xr-x 4 root root 0 ./usr/lib/systemd
-drwxr-xr-x 4 root root 0 ./usr/lib/systemd/system
+drwxr-xr-x 5 root root 0 ./usr/lib/systemd
+drwxr-xr-x 7 root root 0 ./usr/lib/systemd/system
@@ -212,0 +210,4 @@
+drwxr-xr-x 2 root root 0 ./usr/lib/systemd/system-preset
+-rw-r--r-- 1 root root 42 ./usr/lib/systemd/system-preset/80-initrd.preset
+-rw-r--r-- 1 root root 10 ./usr/lib/systemd/system-preset/99-default.preset
+-rw-r--r-- 1 root root 403 ./usr/lib/systemd/system/-.slice
@@ -214 +214,0 @@
-lrwxrwxrwx 1 root root 13 ./usr/lib/systemd/system/ctrl-alt-del.target -> reboot.target
@@ -216,0 +217,3 @@
+drwxr-xr-x 2 root root 0 ./usr/lib/systemd/system/emergency.service.d
+-rw-r--r-- 1 root root 350 ./usr/lib/systemd/system/emergency.service.d/25-keyboard.conf
+-rw-r--r-- 1 root root 185 ./usr/lib/systemd/system/emergency.service.d/50-sulogin-force.conf
@@ -218,0 +222 @@
+-rw-r--r-- 1 root root 487 ./usr/lib/systemd/system/halt.target
@@ -226,0 +231 @@
+-rw-r--r-- 1 root root 501 ./usr/lib/systemd/system/kexec.target
@@ -230,0 +236 @@
+-rw-r--r-- 1 root root 552 ./usr/lib/systemd/system/poweroff.target
@@ -231,0 +238,4 @@
+-rw-r--r-- 1 root root 978 ./usr/lib/systemd/system/rescue.service
+drwxr-xr-x 2 root root 0 ./usr/lib/systemd/system/rescue.service.d
+-rw-r--r-- 1 root root 185 ./usr/lib/systemd/system/rescue.service.d/50-sulogin-force.conf
+-rw-r--r-- 1 root root 486 ./usr/lib/systemd/system/rescue.target
@@ -245,0 +256 @@
+lrwxrwxrwx 1 root root 52 ./usr/lib/systemd/system/sysinit.target.wants/systemd-modules-load.service -> /usr/lib/systemd/system/systemd-modules-load.service
@@ -248,0 +260 @@
+-rw-r--r-- 1 root root 433 ./usr/lib/systemd/system/system.slice
@@ -249,0 +262 @@
+-rw-r--r-- 1 root root 548 ./usr/lib/systemd/system/systemd-halt.service
@@ -254,0 +268,3 @@
+-rw-r--r-- 1 root root 561 ./usr/lib/systemd/system/systemd-kexec.service
+-rw-r--r-- 1 root root 956 ./usr/lib/systemd/system/systemd-modules-load.service
+-rw-r--r-- 1 root root 557 ./usr/lib/systemd/system/systemd-poweroff.service
@@ -260,0 +277,2 @@
+drwxr-xr-x 2 root root 0 ./usr/lib/systemd/system/systemd-udevd.service.d
+-rw-r--r-- 1 root root 149 ./usr/lib/systemd/system/systemd-udevd.service.d/50-systemd-udevd-resolve-never.conf
@@ -265,0 +284,2 @@
+-rwxr-xr-x 1 root root 51912 ./usr/lib/systemd/systemd-modules-load
+-rwxr-xr-x 1 root root 105176 ./usr/lib/systemd/systemd-shutdown
@@ -283 +303 @@
-Image size: 5288037 bytes
+Image size: 5518816 bytesLast edited by ackalker (2015-05-01 13:36:08)
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Known issues (will be updated when needed, be sure to check):
* Depending on how the iernel is configured, keyboard input in Emergency mode might not work without the fix below.
To test, boot the system with added kernel boot parameter `rd.systemd.unit=emergency.target`.
If keyboard input doesn't work, install the optional package systemd-emergency-keyboard-git from the AUR.
* Booting to Emergency mode in QEMU with serial console and QEMU monitor multiplexed over stdio (kernel command line parameters: `console=ttyS0 rd.systemd.unit=emergency.target`, QEMU options `-nographic -serial mon:stdio`), I have to type at least one other character before hitting Enter, or else keyboard input stops working. This problem does not occur for me when booting real hardware (tested with USB keyboard).
From some more testing, it appears to be a problem with the use of `sulogin --force`, replacing that with `sh -l` there are no keyboard issues.
Planned features (help implementing them very welcome):
* Support for adding and masking services in the initrd. This requires changes in the way the hook handles unit dependencies and symlinks.
Last edited by ackalker (2015-04-30 14:47:12)
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v0.2 update:
- Collect all drop-in snippets in a single directory
- Move keyboard drop-in snippet to a new optional package in the AUR: systemd-emergency-keyboard-git.
Updated known issues.
Last edited by ackalker (2015-04-30 14:04:57)
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v0.3 update:
- Fix processing of udev rules (taken from official systemd hook)
v0.4 update:
- Revert workaround for kernel module load (fixed upstream in kmod)
Last edited by ackalker (2015-09-20 15:12:41)
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what's the general differnece between this initramfs and the arch default one?
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