github.com/apptainer/singularity@v3.1.1+incompatible/examples/legacy/2.2/contrib/centos-minimal.def (about)

     1  # Copyright (c) 2015-2017, Gregory M. Kurtzer. All rights reserved.
     2  # 
     3  # "Singularity" Copyright (c) 2016, The Regents of the University of California,
     4  # through Lawrence Berkeley National Laboratory (subject to receipt of any
     5  # required approvals from the U.S. Dept. of Energy).  All rights reserved.
     6  
     7  BootStrap: yum
     8  OSVersion: 7
     9  MirrorURL: http://mirror.centos.org/centos-%{OSVERSION}/%{OSVERSION}/os/$basearch/
    10  
    11  %post
    12      echo "Hello from inside the container"
    13  
    14  %test
    15      echo "This is the test code running" | sed -e 's/code //'
    16      false || true # This will fail without the double pipe
    17      true