mv bug - cannot move to subdirecctory of itself.

So I'm not certain if I'm in the right spot but I had to start somewhere.

I have a docker container that was working but has suddenly stopped working.

I believe the possible cause was when I added a second drive to my zfs rpool - the timing was a little too coincidental.

The docker command sequence I'm running is:

````

RUN wget https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.3.2-linux-x86-64.tar.gz -O /tmp/webp/webp.tar.gz
RUN tar -xvf /tmp/webp/webp.tar.gz --directory /tmp/webp/unzipped

RUN mv /tmp/webp/unzipped/libwebp-1.3.2-linux-x86-64/bin/cwebp /usr/bin/cwebp

```

which results in the error:

```

mv: cannot move '/tmp/webp/unzipped/libwebp-1.3.2-linux-x86-64/bin/cwebp' to a subdirectory of itself, '/usr/bin/cwebp'
The command '/bin/sh -c mv /tmp/webp/unzipped/libwebp-1.3.2-linux-x86-64/bin/cwebp /usr/bin/cwebp' returned a non-zero code: 1

```

So clearly /usr/bin isn't a subdirectory of /tmp/webp so the error must be wrong.

There are no symlinks involved.

zfs list reports:

```

rpool 402G 493G 96K /
rpool/ROOT 141G 493G 96K none
rpool/ROOT/ubuntu_c520d1 141G 493G 18.8G /
rpool/ROOT/ubuntu_c520d1/srv 208K 493G 96K /srv
rpool/ROOT/ubuntu_c520d1/usr 522M 493G 96K /usr
rpool/ROOT/ubuntu_c520d1/usr/local 522M 493G 515M /usr/local
rpool/ROOT/ubuntu_c520d1/var 36.2G 493G 96K /var
rpool/ROOT/ubuntu_c520d1/var/games 208K 493G 96K /var/games
rpool/ROOT/ubuntu_c520d1/var/lib 23.3G 493G 16.8G /var/lib
rpool/ROOT/ubuntu_c520d1/var/lib/AccountsService 744K 493G 100K /var/lib/AccountsService
rpool/ROOT/ubuntu_c520d1/var/lib/NetworkManager 2.64M 493G 236K /var/lib/NetworkManager
rpool/ROOT/ubuntu_c520d1/var/lib/apt 232M 493G 98.8M /var/lib/apt
rpool/ROOT/ubuntu_c520d1/var/lib/dpkg 327M 493G 74.1M /var/lib/dpkg
rpool/ROOT/ubuntu_c520d1/var/log 2.23G 493G 1002M /var/log
rpool/ROOT/ubuntu_c520d1/var/mail 208K 493G 96K /var/mail
rpool/ROOT/ubuntu_c520d1/var/snap 10.7G 493G 12.8M /var/snap
rpool/ROOT/ubuntu_c520d1/var/spool 8.26M 493G 2.36M /var/spool
rpool/ROOT/ubuntu_c520d1/var/www 300K 493G 108K /var/www
rpool/USERDATA 251G 493G 96K /
rpool/USERDATA/bsutton_b4334o 250G 493G 68.9G /home/bsutton
rpool/USERDATA/root_b4334o 854M 493G 845M /root
rpool/var 9.39G 493G 96K /var
rpool/var/lib 9.39G 493G 96K /var/lib
rpool/var/lib/docker 9.39G 493G 9.39G /var/lib/docker

```

Of course these paths shouldn't be relevant as all of the paths in the docker container should be inside a docker volume all mounted under /var/lib/docker.

The reason I'm here is because of this bug:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=923420

When I run 'info coreutils' it reports :

```

This manual documents version 8.32 of the GNU core utilities, including

```

From my reading of the bug 8.32 should have a fix for the mv bug.

Now this could well be a bug in docker as it has a somewhat dubious history of working with zfs but the symptom I'm encountering seemed to match the above bug so here I am.

Any help or suggestions where to go would be appreciated.

Brett

```

Step 6/30 : RUN lsb_release -a
---> Running in c5120a6be61b
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.3 LTS
Release: 22.04
Codename: jammy