Bug with cp and hardlink?

[Frédéric BERNOUD]

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]#