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Old 01-12-2005, 02:24 AM   #1
Registered: Nov 2003
Location: Belgium
Distribution: Mandriva
Posts: 91

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Cd image with hardlinks


i have a directory containing files and subdirectories and a lot of hardlinks. A du shows that the directory is approx 2Gb big, but a copy shows it is more then 8 (due to the hardlinks)

I want to burn this directory on a DVD but only the 2Gb version, so I mean I want to make an image that contains the hardlinks also.

does anybody knows how?


Old 01-12-2005, 04:00 PM   #2
Registered: Jan 2005
Location: Brabant, the Netherlands
Distribution: Gentoo 2004.x (2.6.10 hardened)
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I'm afraid that isn't possible.
There's no distinction between a hard link and a file itself.
Imagine the following: There's a file with NO NAME on the harddisk from byte 4 to 8.
You CALL the file FILE1.
So if you open FILE1, the OS looks the file up in a table and finds it should look at byte 4 to 8.
If you hardlink it (symbolic linking is different!), to FILE2, FILE2 points to byte 4 to 8.
So if you open FILE2, the OS looks the file up, and finds it should look at the same byte 4 to 8.
Conclusion is, if you burn it on CD, you burn the whole file instead of the link.

I guess the reason of the behaviour of du isn't the hardlinks, since hardlinks cannot be distincted from real files normally, but I'm not quite sure.

Are you sure the links are hard and not symbolic? It's possible to get symbolic links on a dvd.
Old 08-27-2006, 05:22 AM   #3
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Registered: Jul 2005
Location: Sweden/Hässleholm
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I do think it is possible, I guess there is the usual mixup with the difference between a hardlink and a symlink. If the links are syminks then the previous answer is correct and it will not be done, however if the links really are harlinks then it is possible with mkisofs. In fact (according to the manpage of mkisofs) that is the default mode of operation. It may be controlled using the flags -cache-inodes and -no-cache-inodes.

I have not tried this myself, but I probably will soon...


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