[ (aka test) not working properly in ubuntu:latest amd64 docker image

[Vlas Baard]

My problem is two-fold.

1.
On an amd64 machine:

$ docker run -ti ubuntu:latest bash
# ls -l /usr/bin/ls
-rwxr-xr-x 1 root root 138208 Feb 7 16:03 /usr/bin/ls
# if [ -r /usr/bin/ls ]; then echo Jay; else echo Nay; fi
Nay

In other words, ls shows that the ls binary is readable, but "[ -r" does not agree. Note:

# which [
#

The same happens with ubuntu:impish and ubuntu:devel, but ubuntu:focal works as expected.

I tried a fresh install with Virtualbox, there things are as expected.

2.
On an Macbook Pro M1, with ubuntu:latest, "[ -r" works as expected. And:

# which [
/usr/bin/[
#

So, the amd64 image is not functionally identical to the arm64 one.

The digest is sha256:b6b83d3c331794420340093eb706a6f152d9c1fa51b262d9bf34594887c2c7ac, which I believe is the latest.

[Chris Newcomer (cnewcomer)]

I am not able to reproduce this behavior. Are you using the docker.io packages from the Ubuntu repository?

# docker run -it ubuntu:latest bash
Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
405f018f9d1d: Pull complete
Digest: sha256:b6b83d3c331794420340093eb706a6f152d9c1fa51b262d9bf34594887c2c7ac
Status: Downloaded newer image for ubuntu:latest
root@b10efb7999c2:/# ls -l /usr/bin/ls
-rwxr-xr-x 1 root root 138208 Feb 7 16:03 /usr/bin/ls
root@b10efb7999c2:/# [[ -r /usr/bin/ls ]] && echo yes || echo no
yes
root@b10efb7999c2:/# if [[ -r /usr/bin/ls ]]; then echo yes; else echo no;fi
yes
root@b10efb7999c2:/# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_CODENAME=jammy
DISTRIB_DESCRIPTION="Ubuntu 22.04 LTS"
root@b10efb7999c2:/# which [
/usr/bin/[

[Vlas Baard (vlasbaard)]

Thanks for trying!

I am using docker.io packages - but the test was on 19.03.12. I've now tried on 20.10.17 and the issue has disappeared.

Note I was trying with single [, not [[ (which I think is always bash internal?).

Either way, 19.03.12 is ancient, so I understand there is no reason to look into this. Feel free to close the case.

[Tomáš Virtus (virtustom)]

Hello,

I also cannot reproduce the issue (on Ubuntu Jammy):

$ docker --version
Docker version 20.10.17, build 100c701
$ sudo docker run -it ubuntu:latest bash
# ls -l /usr/bin/ls
-rwxr-xr-x 1 root root 138208 Feb 7 16:03 /usr/bin/ls
# if [ -r /usr/bin/ls ]; then echo Jay; else echo Nay; fi
Jay
# which [
/usr/bin/[
# grep VERSION= /etc/os-release
VERSION="22.04 LTS (Jammy Jellyfish)"

[Tomáš Virtus (virtustom)]

> Either way, 19.03.12 is ancient, so I understand there is no reason to look into this. Feel free to close the case.

Closing then. Please reopen if you hit the problem with newer Docker daemon.