nested directory creation error

[maflister]

Version of Singularity:

2.4.2

Expected behavior

Creating multiple nested directories in post section using mkdir. Expect it to follow standard bash syntax.
mkdir -p /my/nested/{dir1,dir2}
ls /my/nested
dir1 dir2

Actual behavior

mkdir -p /my/nested/{dir1,dir2}
ls /my/nested
{dir1, dir2}

Steps to reproduce behavior

Run mkdir command with nested directories in the %post section.

[guma44]

What is your base image? Recently when working with Ubuntu I had to do the shell change in the beginning of the %post to get it work:

# CHANGE DASH TO BASH
rm /bin/sh
ln -sf /bin/bash /bin/sh

Apparently, Singularity uses sh as a base shell and sh is linked to dash in eg. Ubuntu.

[dtrudg]

Apparently, Singularity uses sh as a base shell and sh is linked to dash in eg. Ubuntu.

This is the cause of this. Because we need to support thin containers that may not have bash we are unable to force its use.