base.sh hangs when docker has been replaced with podman

We ran into an issue on certain systems where running ch-convert or any charliecloud shell script on flux across multiple nodes hangs indefinitely:

flux run -N 2 ch-convert -i tar -o dir /tmp/neo4j-3.5.34.tar.gz /tmp/neo4j

After some debugging and messing around with charliecloud code, I figured out commenting out the docker function in base.sh solves the issue.

charliecloud/lib/base.sh

Lines 148 to 157 in 6d094f5

    
           # Do we need sudo to run docker? 
        
           if docker info > /dev/null 2>&1; then 
        
               docker_ () { 
        
                   docker "$@" 
        
               } 
        
           else 
        
               docker_ () { 
        
                   sudo docker "$@" 
        
               } 
        
           fi

Checking docker info on these systems yields:

[rustyd@system:~]$ docker info
Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg.
WARN[0000] Network file system detected as backing store.  Enforcing overlay option `force_mask="700"`.  Add it to storage.conf to silence this warning

We also tried flux run -N 1 docker info and that blocks as well so it looks like it's really a podman issue. We're going to submit an issue to podman as well, but until they resolve it charliecloud will have issues as well.

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	# Do we need sudo to run docker?
	if docker info > /dev/null 2>&1; then
	docker_ () {
	docker "$@"
	}
	else
	docker_ () {
	sudo docker "$@"
	}
	fi

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