GNU bug report logs - #56391
`cp --reflink=always` creates empty file on failure

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Package: coreutils;

Reported by: Benjamin Gilbert <bgilbert <at> backtick.net>

Date: Tue, 5 Jul 2022 08:16:01 UTC

Severity: normal

Merged with 56392

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: Benjamin Gilbert <bgilbert <at> backtick.net>
To: 56391 <at> debbugs.gnu.org
Subject: bug#56391: `cp --reflink=always` creates empty file on failure
Date: Tue, 5 Jul 2022 01:39:11 -0400

[Message part 1 (text/plain, inline)]
Hi,

When `cp --reflink=always` fails because the filesystem does not support
reflinks, I'd expect it not to leave anything at the destination path.
However, it appears to leave an empty file instead:

$ ls -l
total 0
$ echo "some data" > src
$ cp --reflink=always src dest
cp: failed to clone 'dest' from 'src': Operation not supported
$ ls -l
total 4
-rw-rw-r--. 1 bgilbert bgilbert  0 Jul  5 01:27 dest
-rw-rw-r--. 1 bgilbert bgilbert 10 Jul  5 01:27 src

I'm seeing this on both coreutils 9.0 (Fedora 36) and 9.1.31-fa332 built
from Git.

Best,
--Benjamin Gilbert

[Message part 2 (text/html, inline)]
This bug report was last modified 3 years and 47 days ago.

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