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bug#34844: Bug report for coreutils
From: |
冰柯 |
Subject: |
bug#34844: Bug report for coreutils |
Date: |
Wed, 13 Mar 2019 15:46:57 +0800 (CST) |
Dear coreutils authors:
Hi! I'm writing this to report a bug for `cp`. Actually I'm not sure if it
is a bug, but it did something weird on my computer. Command `cp` creates
hardlinks on the second call with `-u`.
The strange behavior was encountered when I tried to copy my files, in
which there were a few hardlinks, into a FAT32 partition. At the first time,
the command succeeded, and it then fails on the second call, 'cannot create
hard link ......: Operation not permitted.'
Well, let's see a situation (first try on an ext4 partition, `cp` in
version coreutils-8.28 is used):
First create two directories `src` and `dst`:
$ mkdir src dst
Then create a regular file under `src`, and create a hardlink of it
(`first` => `second`):
$ touch src/first
$ ln src/first src/second
Copy the files into `dst`:
$ cp -v -u src/* dst/
'src/first' -> 'dst/first'
'src/second' -> 'dst/second'
Using `ls` we can see the files under `src` are hardlinks, and files under
`dst` are regular files:
$ ls -l src/
total 0
-rw-rw-r-- 2 icyybk icyybk 0 Mar 13 14:59 first
-rw-rw-r-- 2 icyybk icyybk 0 Mar 13 14:59 second
$ ls -l dst/
total 0
-rw-rw-r-- 1 icyybk icyybk 0 Mar 13 15:03 first
-rw-rw-r-- 1 icyybk icyybk 0 Mar 13 15:03 second
Then, run `cp` again:
$ cp -v -u src/* dst/
removed 'dst/second'
$ ls -l dst/
total 0
-rw-rw-r-- 2 icyybk icyybk 0 Mar 13 15:03 first
-rw-rw-r-- 2 icyybk icyybk 0 Mar 13 15:03 second
It appears that, during a second call, something weird happened, the two
files under `dst` changed into hardlinks.
There's no error outputs in this situation, for the ext4 partition is used.
But when a FAT32 partition is mounted on directory `dst`, the second call will
fail with output:
cp: cannot create hard link 'dst/second' to 'dst/first': Operation not
permitted
Is there anything wrong with my commands? Hope not. I just felt strange
about why they turned into hardlinks while in the first time they are regular
files. Very sure I did not specify `--preserve=links`.
I'm now using version 8.28 of coreutils. It's the currently newest version
I could download using my ubuntu 18.04 lts. Hope this bug will be fixed, if it
is a bug.
Thanks for reading this email, and sorry for my 'not-very-good' English
skills...
Have a nice day.
Yours sincerely,
Icy.
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