[PATCH] Allow fstab-based remount to be controlled by modules

[PATCH] Allow fstab-based remount to be controlled by modules

[Daniel Drake]

OLPC would like to be able to disable this behaviour through
a custom dracut module. Add a "no_fstab_remount" flag which can be
set by modules that want to disable this functionality.

(Background: having the correct rootfs info in /etc/fstab is a bit of a
 challenge for OLPC, because this info is not known at build time.)
---
 modules.d/95rootfs-block/mount-root.sh |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/modules.d/95rootfs-block/mount-root.sh b/modules.d/95rootfs-block/mount-root.sh
index ff64209..7602731 100755
--- a/modules.d/95rootfs-block/mount-root.sh
+++ b/modules.d/95rootfs-block/mount-root.sh
@@ -73,6 +73,7 @@ if [ -n "$root" -a -z "${root%%block:*}" ]; then
     rootopts=
     if getargbool 1 rd.fstab -n rd_NO_FSTAB \
         && ! getarg rootflags \
+        && [ -z "$no_fstab_remount" ] \
         && [ -f "$NEWROOT/etc/fstab" ] \
         && ! [ -L "$NEWROOT/etc/fstab" ]; then
         # if $NEWROOT/etc/fstab contains special mount options for 
-- 
1.7.3.2

Re: [PATCH] Allow fstab-based remount to be controlled by modules

[Harald Hoyer]

On 11/08/2010 08:41 PM, Daniel Drake wrote:
> OLPC would like to be able to disable this behaviour through
> a custom dracut module. Add a "no_fstab_remount" flag which can be
> set by modules that want to disable this functionality.
>
> (Background: having the correct rootfs info in /etc/fstab is a bit of a
>   challenge for OLPC, because this info is not known at build time.)
> ---
>   modules.d/95rootfs-block/mount-root.sh |    1 +
>   1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/modules.d/95rootfs-block/mount-root.sh b/modules.d/95rootfs-block/mount-root.sh
> index ff64209..7602731 100755
> --- a/modules.d/95rootfs-block/mount-root.sh
> +++ b/modules.d/95rootfs-block/mount-root.sh
> @@ -73,6 +73,7 @@ if [ -n "$root" -a -z "${root%%block:*}" ]; then
>       rootopts=
>       if getargbool 1 rd.fstab -n rd_NO_FSTAB \
>           &&  ! getarg rootflags \
> +&&  [ -z "$no_fstab_remount" ] \
>           &&  [ -f "$NEWROOT/etc/fstab" ] \
>           &&  ! [ -L "$NEWROOT/etc/fstab" ]; then
>           # if $NEWROOT/etc/fstab contains special mount options for

Why don't you reuse rd.fstab then? You could add preset kernel cmdline options 
in /etc/cmdline in the initramfs.

Just add for your dracut module in install:

mkdir -p ${initdir}/etc
echo " rd.fstab=0 " >> ${initdir}/etc/cmdline

Re: [PATCH] Allow fstab-based remount to be controlled by modules

[Daniel Drake]

On 10 November 2010 14:32, Harald Hoyer <harald-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> Just add for your dracut module in install:
>
> mkdir -p ${initdir}/etc
> echo " rd.fstab=0 " >> ${initdir}/etc/cmdline

Thanks!
Wasn't aware that you could do this. It was exactly what I was looking
for, no patch needed.

Daniel