[gentoo-user] how can I disable renaming of root fs to "/dev/root"?

[gentoo-user] how can I disable renaming of root fs to "/dev/root"?

[Jarry]

Hi,
this is actually not problem but rather a matter of customs:
My new fresh installed system shows root-fs in "df" as
/dev/root, not actuall device (in my case /dev/md2).

I think I coud get used to it, but some software still needs
/dev/md2 (i.e. lilo), other does not find /dev/md2 anymore
and needs /dev/root to work properly (i.e. monit).

Moreover, in /etc/fstab I still have to use /dev/md2 as root
filesystem, while /etc/mtab shows only /dev/root.

I do not like such a mess and I'd like to put it in rather
consistent state where root filesystem has always the same
and only name. Is there some way to stop this renaming
of root filesystem to /dev/root and let it be as in old
baselayout1?

Jarry
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[gentoo-user] Re: how can I disable renaming of root fs to "/dev/root"?

[Nikos Chantziaras]

On 11/11/2011 07:37 PM, Jarry wrote:
> Hi,
> this is actually not problem but rather a matter of customs:
> My new fresh installed system shows root-fs in "df" as
> /dev/root, not actuall device (in my case /dev/md2).
>
> I think I coud get used to it, but some software still needs
> /dev/md2 (i.e. lilo), other does not find /dev/md2 anymore
> and needs /dev/root to work properly (i.e. monit).
>
> Moreover, in /etc/fstab I still have to use /dev/md2 as root
> filesystem, while /etc/mtab shows only /dev/root.
>
> I do not like such a mess and I'd like to put it in rather
> consistent state where root filesystem has always the same
> and only name.

/dev/root *is* always the same and only name.  It's always /dev/root. 
That makes is the only and same everywhere :-/

Re: [gentoo-user] how can I disable renaming of root fs to "/dev/root"?

[victor romanchuk]

[-- Attachment #1: Type: text/plain, Size: 987 bytes --]

Jarry wrote, at 11/11/2011 09:37 PM:
> Hi,
> this is actually not problem but rather a matter of customs:
> My new fresh installed system shows root-fs in "df" as
> /dev/root, not actuall device (in my case /dev/md2).
>
> I think I coud get used to it, but some software still needs
> /dev/md2 (i.e. lilo), other does not find /dev/md2 anymore
> and needs /dev/root to work properly (i.e. monit).
>
> Moreover, in /etc/fstab I still have to use /dev/md2 as root
> filesystem, while /etc/mtab shows only /dev/root.
>
> I do not like such a mess and I'd like to put it in rather
> consistent state where root filesystem has always the same
> and only name. Is there some way to stop this renaming
> of root filesystem to /dev/root and let it be as in old
> baselayout1?
>
> Jarry

try that patch (attached):

sometime ago i have found it in gentoo forums. probably did few modifications in
the original i found, cannot remember. it works for me for months with no
visible problems

victor

[-- Attachment #2: mtab.patch --]
[-- Type: text/x-patch, Size: 804 bytes --]

--- mtab.orig	2011-05-09 10:39:38.510430618 +0400
+++ /etc/init.d/mtab	2011-11-12 15:23:23.113980922 +0400
@@ -12,6 +12,9 @@
 
 start()
 {
+	# look in an easy way to where root is mounted from
+	ROOTFS=$(readlink -f /dev/root)
+
 	# /etc/mtab could be a symlink to /proc/mounts
 	if [ ! -w /etc/mtab -a -L /etc/mtab ]; then
 		eeinfo "Skipping mtab update (non writeable symlink)"
@@ -28,7 +31,8 @@
 	# makes / readonly and dismounts all tmpfs even if in use which is
 	# not good. Luckily, umount uses /etc/mtab instead of /proc/mounts
 	# which allows this hack to work.
-	grep -v "^[^ ]* / tmpfs " /proc/mounts > /etc/mtab
+	grep -v "^[^ ]* / tmpfs " /proc/mounts |
+		awk '$1 != "rootfs" {print}' | sed 's%/dev/root%'${ROOTFS}'%' > /etc/mtab
 
 	# Remove stale backups
 	rm -f /etc/mtab~ /etc/mtab~~

[gentoo-user] Re: how can I disable renaming of root fs to "/dev/root"?

[Hartmut Figge]

victor romanchuk:

>try that patch (attached):

Thanks for that. Here is a comparison:

Filesystem           1K-blocks      Used Available Use% Mounted on
rootfs               151187140  92949648  50557624  65% /
/dev/root            151187140  92949648  50557624  65% /
rc-svcdir                 1024        96       928  10% /lib/rc/init.d
[...]

With patch:
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda5            151187140  92949656  50557616  65% /
rc-svcdir                 1024        96       928  10% /lib/rc/init.d
[...]

>sometime ago i have found it in gentoo forums. probably did few modifications in
>the original i found, cannot remember. it works for me for months with no
>visible problems

I will wait for problems to occur. ;)

Hartmut
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Re: [gentoo-user] how can I disable renaming of root fs to "/dev/root"?

[Alan Mackenzie]

Hello, Victor.

On Sat, Nov 12, 2011 at 03:43:33PM +0400, victor romanchuk wrote:
> Jarry wrote, at 11/11/2011 09:37 PM:
> > Hi,
> > this is actually not problem but rather a matter of customs:
> > My new fresh installed system shows root-fs in "df" as
> > /dev/root, not actuall device (in my case /dev/md2).

[ .... ]

> > Jarry

> try that patch (attached):

Thank you very much for this.  This annoyance has been bugging me for
quite some time, but not severely enough to make me try and fix it for
myself.  It even works for mount.  :-)

-- 
Alan Mackenzie (Nuremberg, Germany).