Check if Container is Cached - Singularity

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I am looking for a way to check if a container is already cached from a hub url. For example I would want a command to do something like:

singularity iscached docker://username/container:tag
True

Any ideas?

Thanks!

singularity-container
1 Answers

You can use the command

singularity cache list --verbose | grep 'IMAGE_NAME.sif'

if that return code is 0, then the image exists. you can get the return code with $?. you will have to change names like docker://user/repo:tag into the sif filenames that singularity creates.

for example:

singularity cache list --verbose | grep 'alpine_latest.sif'
echo $?  # prints 1
singularity pull docker://alpine:latest
singularity cache list --verbose | grep 'alpine_latest.sif'
echo $?  # prints 0
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