mirror of
https://github.com/zerotier/edge.git
synced 2026-05-22 16:25:05 -07:00
Adam Ierymenko
70 lines
1.3 KiB
Bash
Executable File
70 lines
1.3 KiB
Bash
Executable File
#!/bin/sh
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PROGRAM=setup-hostname
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PREFIX=
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. $PREFIX/lib/libalpine.sh
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usage() {
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cat <<-__EOF__
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usage: setup-hostname [-h] [HOSTNAME]
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Sets the system hostname.
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options:
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-h Show this help
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Sets hostname to HOSTNAME or prompt if unspecified.
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__EOF__
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exit 1
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}
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# http://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names
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valid_hostname() {
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# check length
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if [ $(echo "$1" | wc -c) -gt 63 ]; then
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echo "Hostname '$1' is too long."
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return 1
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fi
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# check that it only contains valid chars
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if ! [ -z "$(echo $1 | sed 's/[0-9a-z-]//g')" ]; then
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echo "Hostname must only contain letters (a-z), digits (0-9) or -"
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return 1
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fi
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# must not start with -
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case "$1" in
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-*) echo "Hostname must not start with a '-'"; return 1;;
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esac
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return 0
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}
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while getopts "hn:" opt; do
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case $opt in
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h) usage;;
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n) name="$OPTARG";;
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esac
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done
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shift $(( $OPTIND - 1 ))
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if [ -z "$name" ] && [ $# -eq 1 ]; then
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name="$1"
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fi
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# if name is set, then we run non-interactively
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if [ -n "$name" ] && ! valid_hostname "$name"; then
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exit 1
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fi
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HOST="$name"
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while [ -z "$name" ]; do
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HOST=$(hostname)
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echon "Enter system hostname (short form, e.g. 'foo') [$HOST]: "
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default_read HOST "$HOST"
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if valid_hostname "$HOST"; then
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break
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fi
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done
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mkdir -p "$ROOT/etc"
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echo "$HOST" > "$ROOT/etc/hostname"
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