Re: [PATCH v4 4/5] iotests/108: skip if fuse is unusable

[Eric Blake <eblake@redhat.com>]

On Fri, Sep 25, 2026 at 09:44:08PM +0200, Eric Farman wrote:
> It is possible that the ability to fusermount is restricted
> to privileged users. Rather than waiting for this test to
> perform a mount and subsequently fail, perform a dummy mount
> early on and skip the tests if fuse is not usable.
> 
> Signed-off-by: Eric Farman <farman@linux.ibm.com>
> ---
>  tests/qemu-iotests/108 | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/tests/qemu-iotests/108 b/tests/qemu-iotests/108
> index bf808b35125..fc3f7322678 100755
> --- a/tests/qemu-iotests/108
> +++ b/tests/qemu-iotests/108
> @@ -73,6 +73,26 @@ else
>          _notrun 'Passwordless sudo for losetup or FUSE support required, but' \
>                  'neither is available'
>      fi
> +
> +    # Test to see if fuse is usable or not (permissions, etc.)
> +    export_mp="$TEST_DIR/fuse-export"
> +    touch "$export_mp"
> +
> +    response=$($QSD \
> +        --blockdev null-co,node-name=export-node \
> +        --export fuse,id=fuse-export,node-name=export-node,mountpoint="$export_mp",allow-other=off \
> +        --daemonize \
> +        --pidfile "$TEST_DIR/qsd.pid" 2>&1)
> +    _notrun_on_fuse_error "$response"
> +
> +    if [ -f "$TEST_DIR/qsd.pid" ]; then
> +        qsd_pid=$(cat "$TEST_DIR/qsd.pid")
> +        kill -KILL "$qsd_pid"
> +        # Wait for process to exit (cannot `wait` because the QSD is daemonized)
> +        while [ -f "$TEST_DIR/qsd.pid" ]; do
> +            true
> +        done

This appears to go into an infinite loop on a machine I tested where
corporate policy software held the fuse mountpoint open long enough
that it caused a race condition in tearing things down.  I'm dropping
this one from my pull request, but 1-3 and 5 remain.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.
Virtualization:  qemu.org | libguestfs.org