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#!/bin/sh
# this script looks for an unused network namespace in /var/run/netns/newpid*
# and invokes "newpid" on it.
set -u
# as long as this file exists, we haven't found a free netns
STAMP=$(mktemp --tmpdir newnet.sh.XXXXXX)
trap "rm -f $STAMP" 0 2 3 15
# loop through namespaces
for ns in /var/run/netns/newpid*; do
if [ ! -f $ns ]; then
# if we get here, the glob didn't expand
echo "No network namespaces matching /var/run/netns/newpid* found" >&2
exit 2
fi
# run the command
(
flock -n 8 || exit
# we got the lock
rm -f $STAMP
echo "newpid-netns: Using namespace $ns"
newpid -iuN $(basename $ns) "$@"
) 8< $ns
EXIT=$?
# if we get here and the stamp file exists, loop for the next NS, else exit
if [ ! -f $STAMP ]; then exit $EXIT; fi
done
# if we get here, error out
echo "No unused network namespace found in /var/run/netns/newpid*" >&2
exit 2
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