Public bug reported:

It cannot convert squashfs and writable image to another format.
When I do that, it shows message`ERROR: Unsupported file type:`. 
However, only sandbox images could be converted to another format.

$ singularity shell test.simg
Singularity: Invoking an interactive shell within container...

Singularity test.simg:~/> exit
$ sudo singularity build --writable test-w.simg test.simg
ERROR: Unsupported file type: test.simg
Cleaning up...

Build 2.4.2 from git repository source works as expected.

# lsb_release -rd
Description:    Ubuntu Bionic Beaver (development branch)
Release:        18.04

# apt-cache policy singularity-container
  Installed: 2.4.2-4
  Candidate: 2.4.2-4
  Version table:
 *** 2.4.2-4 500
        500 bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

** Affects: singularity-container (Ubuntu)
     Importance: Undecided
         Status: New

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  build command don't convert a image file to other style

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