[Fedora Patch] dracut-module-setup.sh: setup correct system time and time zone in 2nd kernel.

[WANG Chao]

Currently in initrd, hardware clock is always considered to use UTC time
format and system time zone is also UTC. Thus system time isn't correct
if hw clock is localtime or we're using other time zone in real root.

To fix this, install /etc/adjtime and /etc/localtime to initrd.

Previously, this functionality was implemented in dracut base module:

commit 77364fd
Author: WANG Chao

base: setup correct system time and time zone in initrd

But some people complains about a normal boot initrd needs to rebuild
every time if time zone is changed. So let's fix it on our side.

Signed-off-by: WANG Chao 
---
 dracut-module-setup.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index 725eecf..3c64d00 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -403,6 +403,7 @@ install() {
     if is_ssh_dump_target; then
         dracut_install /var/lib/random-seed || exit $?
     fi
+    dracut_install -o /etc/adjtime /etc/localtime
     inst "$moddir/monitor_dd_progress" "/kdumpscripts/monitor_dd_progress"
     chmod +x ${initdir}/kdumpscripts/monitor_dd_progress
     inst "/bin/dd" "/bin/dd"

[Vivek Goyal]

On Mon, Jul 29, 2013 at 04:19:46PM +0800, WANG Chao wrote:
> Currently in initrd, hardware clock is always considered to use UTC time
> format and system time zone is also UTC. Thus system time isn't correct
> if hw clock is localtime or we're using other time zone in real root.
>
> To fix this, install /etc/adjtime and /etc/localtime to initrd.
>
> Previously, this functionality was implemented in dracut base module:

What does /etc/adjtime and /etc/localtime do? How does systemd gets
right time stamps in journal in this case?

Thanks
Vivek
> commit 77364fd
> Author: WANG Chao
> base: setup correct system time and time zone in initrd
>
> But some people complains about a normal boot initrd needs to rebuild
> every time if time zone is changed. So let's fix it on our side.
> Signed-off-by: WANG Chao
>
> dracut-module-setup.sh | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
> index 725eecf..3c64d00 100755
> --- a/dracut-module-setup.sh
> +++ b/dracut-module-setup.sh
> @@ -403,6 +403,7 @@ install() {
>      if is_ssh_dump_target; then
>          dracut_install /var/lib/random-seed || exit $?
>      fi
> dracut_install -o /etc/adjtime /etc/localtime
> inst "$moddir/monitor_dd_progress" "/kdumpscripts/monitor_dd_progress"
> chmod +x ${initdir}/kdumpscripts/monitor_dd_progress
> inst "/bin/dd" "/bin/dd"
>
> -- 
> 1.8.3.1
>
> kexec mailing list
> [e-mail]
> https://lists.fedoraproject.org/mailman/listinfo/kexec

[WANG Chao]

On 07/30/13 at 03:45pm, Vivek Goyal wrote:
> On Mon, Jul 29, 2013 at 04:19:46PM +0800, WANG Chao wrote:
> > Currently in initrd, hardware clock is always considered to use UTC time
> > format and system time zone is also UTC. Thus system time isn't correct
> > if hw clock is localtime or we're using other time zone in real root.
> >
> > To fix this, install /etc/adjtime and /etc/localtime to initrd.
> >
> > Previously, this functionality was implemented in dracut base module:
>
> What does /etc/adjtime and /etc/localtime do? How does systemd gets
> right time stamps in journal in this case?

/etc/adjtime is mainly used to determine whether RTC (hareware clock) is
configured in UTC or localtime standard/format. Without this file, RTC
is considered to store time in UTC standard.

/etc/localtime is used for system clock to determine the timezone. It's
usually a symbolic link to a tz info file under /usr/share/zoneinfo/.

For example in my desktop:
# ll /etc/localtime 
lrwxrwxrwx. 1 root root 35 Apr 18 19:27 /etc/localtime ->
../usr/share/zoneinfo/Asia/Shanghai

Thanks
WANG Chao

[Vivek Goyal]

On Mon, Jul 29, 2013 at 04:19:46PM +0800, WANG Chao wrote:
> Currently in initrd, hardware clock is always considered to use UTC time
> format and system time zone is also UTC. Thus system time isn't correct
> if hw clock is localtime or we're using other time zone in real root.
>
> To fix this, install /etc/adjtime and /etc/localtime to initrd.
>
> Previously, this functionality was implemented in dracut base module:
>
> commit 77364fd
> Author: WANG Chao
> base: setup correct system time and time zone in initrd
>
> But some people complains about a normal boot initrd needs to rebuild
> every time if time zone is changed. So let's fix it on our side.
>
> Signed-off-by: WANG Chao

Acked-by: Vivek Goyal

Vivek
> dracut-module-setup.sh | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
> index 725eecf..3c64d00 100755
> --- a/dracut-module-setup.sh
> +++ b/dracut-module-setup.sh
> @@ -403,6 +403,7 @@ install() {
>      if is_ssh_dump_target; then
>          dracut_install /var/lib/random-seed || exit $?
>      fi
> dracut_install -o /etc/adjtime /etc/localtime
> inst "$moddir/monitor_dd_progress" "/kdumpscripts/monitor_dd_progress"
> chmod +x ${initdir}/kdumpscripts/monitor_dd_progress
> inst "/bin/dd" "/bin/dd"
>
> -- 
> 1.8.3.1
>
> kexec mailing list
> [e-mail]
> https://lists.fedoraproject.org/mailman/listinfo/kexec