GNU bug report logs - #55910
cp error

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

From: pk <pkoroau <at> gmail.com>
To: submit <at> debbugs.gnu.org
Subject: cp error
Date: Sat, 11 Jun 2022 11:07:15 +0200

Package: coreutils

- Boot arch linux live cd 2022.06. It has coreutils 9.1-1.
- mkfs.btrfs /dev/vda
- mount /dev/vda /mnt
- cp -ax / /mnt
cp: cannot create directory '/mnt/': No such file or directory

If relevant: strace says that newfstatat and mkdirat have been given
"" as pathname and return ENOENT.

Instead, the exact same steps work on arch linux 2022.03, which has
coreutils 9.0-2. Note that -x should prevent trying to copy /mnt under
itself; on 2022.03, there is a proper error message for cp -a / /mnt
without -x.

Message #10 received at 55910-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: pk <pkoroau <at> gmail.com>
Cc: 55910-done <at> debbugs.gnu.org
Subject: Re: bug#55910: cp error
Date: Sat, 11 Jun 2022 10:56:11 -0700

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

Thanks for the bug report. I installed the attached patch, which should 
fix it. Please give it a try.

[0001-cp-fix-cp-rx-mnt.patch (text/x-patch, attachment)]

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