Bug 181975 - kudzu unnecessarily destroys configuration symlinks
kudzu unnecessarily destroys configuration symlinks
Product: Fedora
Classification: Fedora
Component: kudzu (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Bill Nottingham
David Lawrence
Depends On:
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Reported: 2006-02-18 01:45 EST by JW
Modified: 2014-03-16 22:58 EDT (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2008-03-10 23:52:35 EDT
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
lrename() function to replace rename() (1.45 KB, text/plain)
2006-03-04 21:55 EST, JW
no flags Details

  None (edit)
Description JW 2006-02-18 01:45:05 EST
Description of problem:
When kudzu rewrites configuration files it unncessarily destroys symlinks

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.ln -s inittab.hw1 inittab (or to other configs like fstab and modprobe.conf)
2.change some hardware to force change or delete something from
3.kudzu -s
Actual results:
Any symlinked config files will become ordinary files

Expected results:
Symlinks should be preserved because that is why people use them .. they dont
want them to be destroyed .. otherwise people wouldnt create them in the first place

Additional info:
Ths fix is simple ... provided one has a copy() library function.  Unfortunately
libc doesnt have a simple file copy function, even though it does have a rename().

So, first, write a copy() function and add it to libc.

Then, in files hwconf.c, modules.c, and updfstab.c simply replace the rename()
instances with copy() - except in case of hwconf.c change:
    rename("/etc/inittab-", "/etc/inittab");
    copy("/etc/inittab-", "/etc/inittab");
Comment 1 JW 2006-03-04 21:55:28 EST
Created attachment 125655 [details]
lrename() function to replace rename()

Here is an lrename() function that should be used instead of rename()

This is a lrename() function which differs from rename() in that it attempt to
follow a destination symbolic link.  It is as atomic as rename().  Using this
function instead of rename(P) will ensure that symbolic links are preserved if
possible, on the grounds that people create symbolic links intentionally and
they really want all file reading/writing to go to the symlink target and not
the symlink itself.

Symbolic links should be transparent as far as possible.
Comment 2 Bill Nottingham 2008-03-10 23:52:35 EDT
This code isn't called any more by default, so it is unlikely this code will be

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