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Re: Modifying squashfs usage for `guix pack` for supporting singularity

From: Ludovic Courtès
Subject: Re: Modifying squashfs usage for `guix pack` for supporting singularity
Date: Thu, 12 Mar 2020 14:51:46 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)

Hi Josh,

Apologies for the delay!  (In general, it’s probably safer to report
bugs to address@hidden because they’re tracked and are less likely to
fall through the cracks.)

Josh Marshall <address@hidden> skribis:

> I ran into some trouble today when trying to package an image for singularity 
> on CentOS7.  nxck suggested I go into the cdoe and try adding the "-noappend" 
> option to mksquashfs in 'guix/guix/scripts/pack.scm'.  While looking at it, 
> it seems that it performs a multistep process to modify the squashfs image, 
> which kind of goes against the design of the utility.  A SO page ( 
> ) suggested the full hierarchy be 
> created and then added in a single invocation.  Does anyone have any opinions 
> on such a change or useful insights?


> It also appears the `-mkfs-time 0`, `-all-time 0`, and `-UTC` arguments have 
> been missing.

Could you explain what error you got and what makes you think these
options were missing?

IME, the images produced by ‘guix pack -f squashfs’ work fine with
Singularity 2.x and 3.x.

> Docker and Singularity havebeen moving towards support of the Open Containers 
> Initative, which prompts the discussion of if the docker and sinfularity 
> (squashfs) pack options should be depricated in favor of this standard: 

In fact, ‘guix pack -f docker’ produces an OCI image, IIUC.

Singularity 3.x introduced the Singularity Image Format (SIF), which is
yet another format.  AIUI, SIF is the recommended format for Singularity
3.x, isn’t it?


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