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slirp4netns.sh: Fix up usage, exit 0 on --help

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Based on an original patch by Giuseppe Scrivano: there's no need
to pass $0 to usage, drop that everywhere, and make it consistent.

Don't exit with error on -h, --help.

Suggested-by: Giuseppe Scrivano <gscrivan@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-10-21 20:37:51 +02:00
parent 1fc6416cf9
commit 94c7c1dbcf
1 changed files with 6 additions and 5 deletions
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11
slirp4netns.sh
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@ -17,6 +17,7 @@
PASTA_PID="$(mktemp)"
PASTA_OPTS="-q --ipv4-only -a 10.0.2.0 -n 24 -g 10.0.2.2 -m 1500 --no-ndp --no-dhcpv6 --no-dhcp -P ${PASTA_PID}"
USAGE_RET=1
# add() - Add single option to $PASTA_OPTS
# $1: Option name, with or without argument
@ -111,7 +112,7 @@ opt() {
# usage() - Print slirpnetns(1) usage and exit indicating failure
# $1: Invalid option name, if any
usage() {
[ ${#} -eq 1 ] && printf "s: invalid option -- '%s'\n" "${0}" "${1}"
[ ${#} -eq 1 ] && printf "%s: invalid option -- '%s'\n" "${0}" "${1}"
cat << EOF
Usage: ${0} [OPTION]... PID|PATH TAPNAME
User-mode networking for unprivileged network namespaces.
@ -131,7 +132,7 @@ User-mode networking for unprivileged network namespaces.
-h, --help show this help and exit
-v, --version show version and exit
EOF
exit 1
exit ${USAGE_RET}
}
# version() - Print version
@ -178,10 +179,10 @@ while getopts ce:r:m:6a:hv-: OPT 2>/dev/null; do
userns-path) opt_str USERNS_NAME "${OPTARG}" ;;
enable-sandbox) : Not supported yet ;;
enable-seccomp) : Cannot be disabled ;;
h | help) usage "${0}" ;;
h | help) USAGE_RET=0 && usage ;;
v | version) version ;;
??*) usage "${0}" "${OPT}" ;;
?) usage "${0}" ;;
??*) usage "${OPT}" ;;
?) usage "${OPT}" ;;
esac
done