unsingularity

Extract files from a Singularity/Apptainer SIF file.

Requires squashfs-tools to be installed on the host.

Also requires either of siftool or apptainer.

https://github.com/sylabs/sif

Usage

unsingularity [-h] [-c] [-d DIRECTORY] [-e EXTRACT] [-l] [sif]...

• -c: cat files after extracting
• -e: extract only certain files
• -d: directory (default: squashfs-root)
• -i: inspect metadata, don't extract
• -l: list only, don't extract (-ll long)
• -m: use squashfuse, instead of unsquashfs
• -n: use squashnfs, instead of squashfuse

Mount

If you use the mount flag (-m), the filesystem is FUSE mounted.

When done with the files, use: fuserunmount (fusermount -u).

If you use the nfs mount flag (-n), it is instead NFS mounted.

When done with the files, use: squashnfs -u (or unmount it).

Install

sudo install unsingularity.sh /usr/local/bin/unsingularity

Examples

unsingularity alpine.sif

unsingularity -e /usr/lib/os-release -c alpine.sif

unsingularity -ll debian.sif