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#!/bin/sh
PROGRAM=setup-hostname
PREFIX=
. $PREFIX/lib/libalpine.sh
usage() {
cat <<-__EOF__
usage: setup-hostname [-h] [HOSTNAME]
Sets the system hostname.
options:
-h Show this help
Sets hostname to HOSTNAME or prompt if unspecified.
__EOF__
exit 1
}
# http://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names
valid_hostname() {
# check length
if [ $(echo "$1" | wc -c) -gt 63 ]; then
echo "Hostname '$1' is too long."
return 1
fi
# check that it only contains valid chars
if ! [ -z "$(echo $1 | sed 's/[0-9a-z-]//g')" ]; then
echo "Hostname must only contain letters (a-z), digits (0-9) or -"
return 1
fi
# must not start with -
case "$1" in
-*) echo "Hostname must not start with a '-'"; return 1;;
esac
return 0
}
while getopts "hn:" opt; do
case $opt in
h) usage;;
n) name="$OPTARG";;
esac
done
shift $(( $OPTIND - 1 ))
if [ -z "$name" ] && [ $# -eq 1 ]; then
name="$1"
fi
# if name is set, then we run non-interactively
if [ -n "$name" ] && ! valid_hostname "$name"; then
exit 1
fi
HOST="$name"
while [ -z "$name" ]; do
HOST=$(hostname)
ask "Enter system hostname (short form, e.g. 'foo')" "$HOST"
if valid_hostname "$resp"; then
HOST="$resp"
break
fi
done
mkdir -p "$ROOT/etc"
echo "$HOST" > "$ROOT/etc/hostname"
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