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#1 2013-01-08 23:41:27

ryo
Member
From: Fréjus, France
Registered: 2010-11-17
Posts: 42

[solved] About ext3 behaviour

Hi smile

... and firstly happy new year !

I found something strange tonight. i'll try to be clear :

I have 2 partitions from the same disk mounted

/dev/sda3 on /home/ryo type ext3 (rw,commit=0)
/dev/sda4 on /media/HDD1 type ext3 (rw,nosuid,nodev,data=ordered,user=ryo)

i switched the "data" option to ordered ( from data=writeback ) to test the "strange thing" but it did not helped.

The case :

i have an alias to backup some config files

alias backup_fvwm="tar cfvz /media/HDD1/gentoo/fichiers/FVWM/Fvwm-ryo-$(date +%d%m%y_%H%M).tgz ~/.fvwm/"

which give me a tarball with date in title

Fvwm-ryo-080113_17H03.tgz

When i execute the command in $HOME dir, the tarball contains the "right" title.
If i execute the alias

 backup_fvwm

AND IF i have executed this command some minutes ago, the tarball is not renamed, but is touched :

T=12:11pm

ryo@RyoBox /media/HDD1/gentoo/fichiers/FVWM $ ls -l
total 0

ryo@RyoBox /media/HDD1/gentoo/fichiers/FVWM $ backup_fvwm && ls -l
(... tarball creation )
-rw-r--r-- 1 ryo users 194836  9 janv. 00:11 Fvwm-ryo-080113_23H33.tgz

notice the time and date in title ? a previous backup sad

It gives me some headaches and drives me crazy.

While i was writing i executed a few commands , 1 new tarball finally appeared, and then the previous one is touched at each command :

-rw-r--r-- 1 ryo users 194870  9 janv. 00:22 Fvwm-ryo-080113_23H33.tgz
-rw-r--r-- 1 ryo users 194870  9 janv. 00:19 Fvwm-ryo-090113_00H14.tgz

in facts, the "touched" tarball is good, the files inside are updated.


i'm still digging, if anyone got some infos , please share smile

thank you.

PS:

Linux RyoBox 3.7.0-gentoo #1 SMP PREEMPT Mon Dec 17 22:30:05 CET 2012 x86_64 Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz GenuineIntel GNU/Linux
LABEL="HOME"    /home/ryo           ext3                auto                        0 2
LABEL="HDD1"    /media/HDD1        ext3                auto,rw,user,exec,data=ordered 0 2
-rw-r--r-- 1 ryo users 194870  9 janv. 00:29 Fvwm-ryo-080113_23H33.tgz

1 hour older than its name , wtf ...

Last edited by ryo (2013-01-10 13:10:50)

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#2 2013-01-10 11:21:35

Judge
Staff
From: Germany, NRW, Heiligenhaus
Registered: 2011-07-03
Posts: 283

Re: [solved] About ext3 behaviour

What makes me wonder: $(date +%d%m%y_%H%M) should give something like "100113_1219" (at 12:19 o'clock on Jan 10 2013), not "100113_12H19"; notice the "H" between hour and minute?
Is it possible that your alias overlaps with another or such?

PS:
Try to execute "alias backup_fvwm" to have the mapping printed before executing it and check if it the alias you planned to exec.
Also, please logout from the System completely and re-login to make sure you reset the environment for your shell.

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#3 2013-01-10 13:05:47

ryo
Member
From: Fréjus, France
Registered: 2010-11-17
Posts: 42

Re: [solved] About ext3 behaviour

Judge wrote:

What makes me wonder: $(date +%d%m%y_%H%M) should give something like "100113_1219" (at 12:19 o'clock on Jan 10 2013), not "100113_12H19"; notice the "H" between hour and minute

Hi Judge,

You have an eagle eye ! smile

That 's a mistake because i edited 2 or 3 times my post and once deleted the second "H" , i thought i made an error.

The real alias is

alias backup_fvwm="tar cfvz /media/HDD1/gentoo/fichiers/FVWM/Fvwm-ryo-$(date +%d%m%y_%HH%M).tgz ~/.fvwm/" 

which give

Fvwm-ryo-100113_13H46.tgz

Thank you very much for your hints.
I was not aware about calling alias in a term.

The alias command is parsed on login or when we source it , but substitutions seems to be done only once.
This is why the date stay the same. I also tried

alias backup_fvwm="tar cfvz /media/HDD1/gentoo/fichiers/FVWM/Fvwm-ryo-`date +%d%m%y_%HH%M`.tgz ~/.fvwm/" 

But it 's the same result.

I thought it was about latency in ext3 , i was too far away ^^

I know where to dig now , thank you smile

Last edited by ryo (2013-01-10 13:09:49)

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#4 2013-01-10 14:55:47

Judge
Staff
From: Germany, NRW, Heiligenhaus
Registered: 2011-07-03
Posts: 283

Re: [solved] About ext3 behaviour

Yaaaaay big_smile

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