f8c4a0f4e5
- lsinitrd.sh: add old cpio signature - dracut.sh: call find with -print0 and cpio with --null - dracut.asc: small corrections - systemd/dracut-initqueue.sh: continue to boot if finished failed - dracut.sh/dracut-functions.sh: handle root on non-block device - dracut-functions.sh: removed non dracut-install shell functions - dracut-functions.sh: inst_multiple == dracut_install - 51-dracut-rescue.install: fixed rescue image creation - dracut.sh: do not strip in FIPS mode Resolves: rhbz#990250 - dracut.sh: check the value of --kver - crypt: Fix typo--/etc/crypttab not /etc/cryptab - network/net-lib.sh: fix ibft interface configuration - iscsi/module-setup.sh: install some modules regardless of hostonly - multipath: need_shutdown if multipath devices exist Resolves: rhbz#994913 - omit drivers fix
199 lines
5.9 KiB
Diff
199 lines
5.9 KiB
Diff
From 89f7217954231dc11307cc481f1e3ca8ad3ad001 Mon Sep 17 00:00:00 2001
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From: Harald Hoyer <harald@redhat.com>
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Date: Mon, 5 Aug 2013 11:22:55 +0200
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Subject: [PATCH] dracut.asc: small corrections
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---
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dracut.asc | 75 ++++++++++++++------------------------------------------------
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1 file changed, 16 insertions(+), 59 deletions(-)
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diff --git a/dracut.asc b/dracut.asc
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index 4de3dbf..dfad67e 100644
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--- a/dracut.asc
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+++ b/dracut.asc
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@@ -777,25 +777,12 @@ scripts and udev rules.
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[[stages]]
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== Boot Process Stages
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-The init script in _99base_ is the main script, which prepares the root file
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-system for usage, runs udev, mounts the real root device, kills the remaining
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-processes, and switches to the real root device for further booting. dracut
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-modules can insert custom script at various points, to control the boot process.
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+dracut modules can insert custom script at various points, to control the boot
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+process.
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These hooks are plain directories containing shell scripts ending with ".sh",
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which are sourced by init.
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Common used functions are in _dracut-lib.sh_, which can be sourced by any script.
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-
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-
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-=== Basic Setup
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-
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-The first thing init does, is to mount _/proc_ and _/sys_ and manually create
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-the basic device nodes and symbolic links in _/dev_ needed to execute basic
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-commands. Then logging is setup according to kernel command line arguments.
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-_/dev/pts_ and _/dev/shm_ are mounted and the first hook is sourced.
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-
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-
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-
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=== Hook: cmdline
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The _cmdline_ hook is a place to insert scripts to parse the kernel command line
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@@ -813,63 +800,49 @@ This hook is executed right after the cmdline hook and a check if root and
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rootok were set. Here modules can take action with the final root, and before
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udev has been run.
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-
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-
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=== Start Udev
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Now udev is started and the logging for udev is setup.
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-
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-
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=== Hook: pre-trigger
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In this hook, you can set udev environment variables with **udevadm control
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--property=KEY=_value_** or control the further execution of udev with
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udevadm.
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-
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-
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=== Trigger Udev
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udev is triggered by calling udevadm trigger, which sends add events for all
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devices and subsystems.
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-
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-
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=== Main Loop
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-Now the main loop of 99base/init begins. Here we loop until udev has settled and
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-all scripts in _initqueue/finished_ returned true. In this loop there are three
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-hooks, where scripts can be inserted by calling /sbin/initqueue.
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-
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-
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+In the main loop of dracut loops until udev has settled and
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+all scripts in _initqueue/finished_ returned true.
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+In this loop there are three hooks, where scripts can be inserted
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+by calling /sbin/initqueue.
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==== Initqueue
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This hook gets executed every time a script is inserted here, regardless of the
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udev state.
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-
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-
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==== Initqueue settled
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-This hooks gets executed every time udev has settled.
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-
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+This hooks (initqueue/settled) gets executed every time udev has settled.
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==== Initqueue timeout
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-This hooks gets executed, when the main loop counter becomes half of the
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+This hooks (initqueue/timeout) gets executed, when the main loop counter becomes half of the
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rd.retry counter.
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-
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-
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==== Initqueue finished
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-This hook is called after udev has settled and if all scripts herein return 0
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-the main loop will be ended.
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-
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-
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+This hook (initqueue/finished) is called after udev has settled and
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+if all scripts herein return 0 the main loop will be ended.
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+Abritary scripts can be added here, to loop in the
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+initqueue until something happens, which a dracut module wants to wait for.
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=== Hook: pre-mount
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@@ -877,20 +850,15 @@ Before the root device is mounted all scripts in the hook pre-mount are
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executed. In some cases (e.g. NFS) the real root device is already mounted,
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though.
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-
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-
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=== Hook: mount
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This hook is mainly to mount the real root device.
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-
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-
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=== Hook: pre-pivot
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This hook is called before cleanup hook, This is a good place for
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actions other than cleanups which need to be called before pivot.
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-
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=== Hook: cleanup
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This hook is the last hook and is called before init finally switches root to
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@@ -900,21 +868,18 @@ needed anymore.
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=== Cleanup and switch_root
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-Init kills all udev processes, cleans up the environment, sets up the arguments
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-for the real init process and finally calls switch_root. switch_root removes the
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-whole filesystem hierarchy of the initramfs, chroot()s to the real root device
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-and calls /sbin/init with the specified arguments.
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+Init (or systemd) kills all udev processes, cleans up the environment,
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+sets up the arguments for the real init process and finally calls switch_root.
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+switch_root removes the whole filesystem hierarchy of the initramfs,
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+chroot()s to the real root device and calls /sbin/init with the specified arguments.
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To ensure all files in the initramfs hierarchy can be removed, all processes
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still running from the initramfs should not have any open file descriptors left.
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-
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-
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== Network Infrastructure
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FIXME
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-
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== Writing a Module
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A simple example module is _96insmodpost_, which modprobes a kernel module after
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@@ -926,8 +891,6 @@ First we create a check() function, which just exits with 0 indicating that this
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module should be included by default.
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check():
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-
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-
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----
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return 0
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----
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@@ -937,8 +900,6 @@ priority number 20 called _parse-insmodpost.sh_. It also installs the
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_insmodpost.sh_ script in _/sbin_.
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install():
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-
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-
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----
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inst_hook cmdline 20 "$moddir/parse-insmodpost.sh"
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inst_simple "$moddir/insmodpost.sh" /sbin/insmodpost.sh
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@@ -949,8 +910,6 @@ rd.driver.post, blacklists the module from being autoloaded and installs the
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hook _insmodpost.sh_ in the _initqueue/settled_.
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_parse-insmodpost.sh_:
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-
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-
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----
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for p in $(getargs rd.driver.post=); do
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echo "blacklist $p" >> /etc/modprobe.d/initramfsblacklist.conf
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@@ -967,8 +926,6 @@ modprobe the kernel modules specified in all rd.driver.post kernel command line
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parameters. It runs after udev has settled and is only called once (--onetime).
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_insmodpost.sh_:
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-
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-
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----
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. /lib/dracut-lib.sh
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