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Bug with cp and hardlink?
From: |
Frédéric BERNOUD |
Subject: |
Bug with cp and hardlink? |
Date: |
Tue, 2 Feb 2010 16:20:37 +0100 |
It seems there is a BUG with cp !
I regularly encounter a problem with the order "cp - al " on several of backup
under CENTOS. I m using rsnapshot for the backup.
My backup works with Rsnapshot application , which using "cp. -al" command
This is reproductible *each time*. Note the bizarre error message
above (hardlinking over itself : ./daily.HARD_COPY" --> "./daily.HARD_COPY"...
and not "./daily.0" ---> "./daily.HARD_COPY") :
.snapshots]# cp -al daily.0 daily.HARD_COPY
cp: cannot create hard link
`daily.HARD_COPY/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc'
to
`daily.HARD_COPY/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc':
No such file or directory
.snapshots]#
Yes, that file is missing on the copy.
.snapshots]# ls -l
daily.HARD_COPY/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc
ls:
daily.HARD_COPY/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc:
No such file or directory
.snapshots]#
And the file is not corrupted
.snapshots]# mv
daily.0/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc
./
.snapshots]# cp -al 00001284.doc 00001284.doc-hard-link
.snapshots]# ls -l 00001284.doc-hard-link
-rwxr--r-- 27 nobody nobody 30720 Jun 28 2006 00001284.doc-hard-link
.snapshots]#
It is working if we remove the file:
.snapshots]# cp -al daily.0 daily.HARD_COPY2
.snapshots]# echo $?
0
.snapshots]#
This is reproductible:
.snapshots]# cp -al daily.0 daily.HARD_COPY3
cp: cannot create hard link
`daily.HARD_COPY3/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc'
to
`daily.HARD_COPY3/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc':
No such file or directory
.snapshots]# ls -l
daily.HARD_COPY3/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc
ls:
daily.HARD_COPY3/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc:
No such file or directory
.snapshots]# ls -l
daily.0/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc
-rwxr--r-- 27 nobody nobody 30720 Jun 28 2006
daily.0/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc
.snapshots]#
with coreutils 8.4 it is the same thing with another error message. But the
file is coping:
.snapshots]# /usr/bin/cp-8.4 --version
cp (GNU coreutils) 8.4
.snapshots]# /usr/bin/cp-8.4 -al daily.0 daily.HARD_COPY4
/usr/bin/cp-8.4: cannot create link
`daily.HARD_COPY4/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc':
File exists
.snapshots]# ls -l
daily.HARD_COPY4/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc
-rwxr--r-- 28 nobody nobody 30720 Jun 28 2006
daily.HARD_COPY4/localhost/home/sauvegardes/sauvegarde_microlog/copacu/COUREVEN/00001284.doc
.snapshots]#
Someone have the same bug on debian:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=512831
Please help!
.snapshots]# rpm -qa rsnapshot
rsnapshot-1.3.0-1.el5.rf
.snapshots]#
.snapshots]# cp --version
cp (GNU coreutils) 5.97
.snapshots]# cat /etc/redhat-release
CentOS release 5 (Final)
.snapshots]#
.snapshots]# rpm -qa coreutils
coreutils-5.97-23.el5_4.1
.snapshots]#
# uname -a
Linux sageetbellierbackup.altiva.org 2.6.18-8.1.14.el5 #1 SMP Thu Sep 27
18:58:54 EDT 2007 i686 i686 i386 GNU/Linux
.snapshots]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md0 4.8G 308M 4.2G 7% /
tmpfs 247M 0 247M 0% /dev/shm
/dev/md5 434G 106G 306G 26% /home
/dev/md4 965M 18M 898M 2% /tmp
/dev/md2 4.8G 1.5G 3.1G 33% /usr
/dev/md3 5.7G 501M 4.9G 10% /var
.snapshots]#
- Bug with cp and hardlink?,
Frédéric BERNOUD <=