If a module is renamed or another module takes care of the old one,
all of the alias strings have to be checked against the current set of
loaded modules.
This is still incomplete, because to be absolutely correct, all the
/sys/*...*/modalias files would have to be checked, if they match the
modules alias strings.
- use local variables with _
- use associative array for the kernel modules
- install emergency hook even in the systemd case
- follow device path until /sys is reached
- set kernel version for modprobe checking
If the initramfs was built with prefix=/run/... /run can't be mounted
with noexec, otherwise no binary can be run.
Guard against it by looking where /bin/sh is really located.
Trigger the acpi subsystem. This will ensure hv_vmbus gets loaded before
plymouth is started, which will make the graphics device become
available before plymouth is started too (and the keyboard ! which might
also be important for plymouth in some setups).
https://bugzilla.redhat.com/show_bug.cgi?id=1218130
(cherry picked from commit d2846fdcce9b8de0edecdf0e06a4b86fc8de542c)
It is expected that a watchdog module will disable an active watchdog when
its probe is called ie, when it is loaded. So an early load of the module
will help to disable it earlier.
This can be helpful in some corner cases where kdump and watchdog daemon
both are active.
Testing:
-- When watchdog kernel modules were added
# dracut --no-hostonly initramfs-test.img -a watchdog
# lsinitrd initramfs-test.img -f etc/cmdline.d/00-watchdog.conf
rd.driver.pre=iTCO_wdt,lpc_ich,
Signed-off-by: Pratyush Anand <panand@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Harald Hoyer <harald@redhat.com>
Recently following patches have been added in upstream Linux kernel, which
(1) fixes parent of watchdog_device so that
/sys/class/watchdog/watchdogn/device is populated. (2) adds some sysfs
device attributes so that different watchdog status can be read.
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6551881c86c791237a3bebf11eb3bd70b60ea782http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=906d7a5cfeda508e7361f021605579a00cd82815http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=33b711269ade3f6bc9d9d15e4343e6fa922d999b
With the above support, now we can find out whether a watchdog is active or
not. We can also find out the driver/module responsible for that watchdog
device.
Proposed patch uses above support and then adds module of active watchdog
in initramfs generated by dracut for hostonly mode. Kernel module for
inactive watchdog will be added as well for none hostonly mode.
When an user does not want to add kernel module, then one should exclude
complete dracut watchdog module with --omit.
Testing:
-- When watchdog is active watchdog modules were added
# cat /sys/class/watchdog/watchdog0/identity
iTCO_wdt
# cat /sys/class/watchdog/watchdog0/state
active
# dracut --hostonly initramfs-test.img -a watchdog
# lsinitrd initramfs-test.img | grep iTCO
-rw-r--r-- 1 root root 9100 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_vendor_support.ko
-rw-r--r-- 1 root root 19252 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_wdt.ko
-- When watchdog is inactive then watchdog modules were not added
# cat /sys/class/watchdog/watchdog0/state
inactive
# dracut --hostonly initramfs-test.img -a watchdog
# lsinitrd initramfs-test.img | grep iTCO
-- When watchdog is inactive, but no hostonly mode, watchdog modules were added
# cat /sys/class/watchdog/watchdog0/state
inactive
# dracut --no-hostonly initramfs-test.img -a watchdog
# lsinitrd initramfs-test.img | grep iTCO
-rw-r--r-- 1 root root 9100 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_vendor_support.ko
-rw-r--r-- 1 root root 19252 Feb 24 09:19 usr/lib/modules/.../kernel/drivers/watchdog/iTCO_wdt.ko
Signed-off-by: Pratyush Anand <panand@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Harald Hoyer <harald@redhat.com>
When systemd is present, let it manage watchdog feed.
Signed-off-by: Pratyush Anand <panand@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Harald Hoyer <harald@redhat.com>
How to reproduce:
host# ./dracut.sh -o 'dracut-systemd systemd systemd-initrd' --local -f ./initramfs.img
host# qemu-system-x86_64 -initrd ./initramfs.img \
-append 'root=/dev/sda1 rd.cmdline=ask rd.hostonly=0' \
...
Enter additional kernel command line parameter (end with ctrl-d or .)
> rd.break
> .
...
There is no "Break before switch_root"
...
Signed-off-by: Evgeny Vereshchagin <evvers@ya.ru>
Handle module aliases correctly to not generate unbootable
initrds with different kernel versions when modules were renamed
or replaced.
Signed-off-by: Fabian Vogt <fvogt@suse.com>
Harald Hoyer