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[DOC] Described problem regarding linked directory in path

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Nico Schottelius 2006-04-29 00:24:48 +02:00
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@ -492,6 +492,50 @@ The most common error is to not give your script the correct
permissions. Try `chmod 0755 /etc/ccollect/sources/'yoursource'/*_exec``.
Why does the backup job fail, when part of the source is a link?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When a part of your path you specified in the source is a
(symbolic, hard links are not possible for directories) link,
the backup *must* fail.
First of all, let us have a look at how it looks like:
-------------------------------------------------------------------------------
==> ccollect 0.4: Beginning backup using interval taeglich <==
[testsource] Sa Apr 29 00:01:55 CEST 2006 Beginning to backup
[testsource] Currently 0 backup(s) exist(s), total keeping 10 backup(s).
[testsource] Beginning to backup, this may take some time...
[testsource] Creating /etc/ccollect/sources/testsource/destination/taeglich.2006-04-29-0001.3874 ...
[testsource] Sa Apr 29 00:01:55 CEST 2006 Transferring files...
[testsource] rsync: recv_generator: mkdir "/etc/ccollect/sources/testsource/destination/taeglich.2006-04-29-0001.3874/home/user/nico/projekte/ccollect" failed: No such file or directory (2)
[testsource] rsync: stat "/etc/ccollect/sources/testsource/destination/taeglich.2006-04-29-0001.3874/home/user/nico/projekte/ccollect" failed: No such file or directory (2)
[...]
-------------------------------------------------------------------------------
So what is the problem? It is very obvious, when you have a deeper look
into it:
-------------------------------------------------------------------------------
% cat /etc/ccollect/sources/testsource/source
/home/user/nico/projekte/ccollect/ccollect-0.4
% ls -l /home/user/nico/projekte
lrwxrwxrwx 1 nico nico 29 2005-12-02 23:28 /home/user/nico/projekte -> oeffentlich/computer/projekte
% ls -l /etc/ccollect/sources/testsource/destination/taeglich.2006-04-29-0001.3874/home/user/nico
lrwxrwxrwx 1 nico nico 29 2006-04-29 00:01 projekte -> oeffentlich/computer/projekte
-------------------------------------------------------------------------------
`rsync` creates the directory structure until it creates the symbolic link.
This link now links to something not reachable (dead link). So it is
impossible to create subdirectories below the broken link.
So, the conclusion is you cannot use paths with a linked part.
*BUT* you can backup directories containing symbolic links
(in this case you could backup /home/user/nico, which contains
/home/user/nico/projekte and oeffentlich/computer/projekte).
Examples
--------