this ch-run does not support internal SquashFS mounts

[VladimirFokow]

Hello!

I'm following the tutorial here: https://hpc.github.io/charliecloud/tutorial.html#build-from-dockerfile
and getting an error:

 ch-run[192857]: error: this ch-run does not support internal SquashFS mounts (ch-run.c:213)

I've tested this with such charliecloud versions:

• 0.32 (is in ch-run.c:188)
• 0.37 (is in ch-run.c:213)

Another (custom) example:

Dockerfile:

FROM ubuntu:22.04

Commands:

ch-image build -t test .
ch-image list

test
ubuntu:22.04

then:

ch-convert test test.sqfs
ls

Dockerfile  test.sqfs

then:

ch-run test.sqfs -- bash

ch-run[192857]: error: this ch-run does not support internal SquashFS mounts (ch-run.c:213)

After running ./configure, I noticed this in its output:

Building Charliecloud
~~~~~~~~~~~~~~~~~~~~~

. . .

  ch-run(1) internal SquashFS mounting: no
    enabled ... yes
    libfuse3 ... no 
    libsquashfuse_ll ... n/a
    ll.h header ... n/a

. . .

Test suite
~~~~~~~~~~
.
.
.
  recommended tests, squash-unpack mode: no
    basic tests ... yes
    more tests ... no
    pack/unpack SquashFS images ... yes

  recommended tests, squash-mount mode: no
    recommended, squash-unpack mode: no
    internal SquashFS mounting ... no

How to solve it? What does it mean?

[reidpr]

Hello Vladimir and welcome.

To run SquashFS images, you need to link Charliecloud with libsquashfuse at built time, i.e. you’ll need “internal SquashFS mounting ... yes” from configure. With most distros this requires building and installing SquashFUSE from source.

An alternative is to do the tutorial with directory format images. For example, you’d say something like ch-convert test /var/tmp/test and then ch-run /var/tmp/test -- bash.

Does that help?

[VladimirFokow]

thank you! The reason became clear.

I've tried the directory images and wanted to explore the .sqfs format now :)

[reidpr]

You should be able to install SquashFUSE without root. You’d do something like ./configure --prefix=$HOME/opt for SquashFUSE and then ./configure --with-libsquashfuse=$HOME/opt for Charliecloud.