[pacman-dev] difficult symlink puzzle, part 2.

Xavier shiningxc at gmail.com
Sun Aug 5 17:43:02 EDT 2007

On Fri, Aug 03, 2007 at 12:15:56AM +0200, Nagy Gabor wrote:
> Hi!
> If I didn't misunderstood conflict.c then fileconflict check fails in the 
> following case (pacman -A pkg1 pkg2):
> pkg1 contains: /dir1/file
> pkg2 contains: /dir2/file,
> if /dir1 and /dir2 exists on filesystem, and /dir2 is a symlink pointing 
> to /dir1.
> Much more difficult problem (and fortunately much rarer), if pkg2 creates 
> the /dir2 symlink, so it didn't exist before the transaction.
> Any tests/feedbacks appreciated...

If it's possible to extend pactest for this stuff, it could probably help.

> How is this handled in other package managers?

I tried to look at dpkg code, I didn't understand anything :p

> PS: a possible semi-solution: pacman shouldn't stop/overwrite in case of 
> these "hidden" fileconflict errors, it extract /dir2/file as 
> /dir2/file.pkg2.pacnew and do something at the end of the transaction. 
> (Speed is a big limiting factor here.)

dpkg seems to use suffix as well, .dpkg-new and .dpkg-tmp. dpkg-new is
apparently used for config files, and dpkg-tmp, I'm not sure.
You can grep for these strings in dpkg source:

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