GNU bug report logs - #14116
[PATCH] ln: allow to overwrite relative symlink

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Rémy Lefevre <lefevreremy <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: [PATCH] ln: allow to overwrite relative symlink
Date: Mon, 1 Apr 2013 16:40:59 +0200

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Overwriting relative symlink leads to undesirable behavior. Consider the
following example:

# Create some directories
mkdir test
mkdir test/folder1
mkdir test/folder2

#Create some files
touch test/folder1/file1
touch test/folder1/file2

#Create a relative symlink in folder2 to file1
ln -sr test/folder1/file1 test/folder2/link

#Check the link
ls -l test/folder2/link
# Correctly output a link to ../folder1/file1

#Overwrite the symlink to point to file2
ln -sfr test/folder1/file2 test/folder2/link

#Check the link
ls -l test/folder2/link
# Wrongly output a link to file2 instead of ../folder1/file2


This undesirable behavior is due to a dereferencing of the target when the
relative path is computed. Passing CAN_NOLINKS flag to
canonicalize_filename_mode solves the problem.

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