mirror of
https://gitlab.alpinelinux.org/alpine/aports.git
synced 2025-10-15 01:11:58 +02:00
283 lines
6.1 KiB
Bash
Executable File
283 lines
6.1 KiB
Bash
Executable File
#!/bin/sh
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# simple script to set up a new lxc guest
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# test the first argument against the remaining ones, return success on a match
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isin() {
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local _a=$1 _b
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shift
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for _b; do
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[ "$_a" = "$_b" ] && return 0
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done
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return 1
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}
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# remove all occurrences of first argument from list formed by
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# the remaining arguments
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rmel() {
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local _a=$1 _b
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shift
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for _b; do
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[ "$_a" != "$_b" ] && echo -n "$_b "
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done
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}
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# Issue a read into the global variable $resp.
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_ask() {
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local _redo=0
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read resp
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case "$resp" in
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!) echo "Type 'exit' to return to setup."
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sh
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_redo=1
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;;
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!*) eval "${resp#?}"
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_redo=1
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;;
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esac
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return $_redo
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}
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# Ask for user input.
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#
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# $1 = the question to ask the user
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# $2 = the default answer
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#
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# Save the user input (or the default) in $resp.
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#
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# Allow the user to escape to shells ('!') or execute commands
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# ('!foo') before entering the input.
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ask() {
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local _question=$1 _default=$2
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while :; do
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echo -n "$_question "
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[ -z "$_default" ] || echo -n "[$_default] "
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_ask && : ${resp:=$_default} && break
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done
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}
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# Ask for user input until a non-empty reply is entered.
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#
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# $1 = the question to ask the user
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# $2 = the default answer
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#
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# Save the user input (or the default) in $resp.
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ask_until() {
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resp=
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while [ -z "$resp" ] ; do
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ask "$1" "$2"
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done
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}
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# Ask for the user to select one value from a list, or 'done'.
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#
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# $1 = name of the list items (disk, cd, etc.)
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# $2 = question to ask
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# $3 = list of valid choices
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# $4 = default choice, if it is not specified use the first item in $3
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#
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# N.B.! $3 and $4 will be "expanded" using eval, so be sure to escape them
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# if they contain spooky stuff
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#
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# At exit $resp holds selected item, or 'done'
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ask_which() {
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local _name=$1 _query=$2 _list=$3 _def=$4 _dynlist _dyndef
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while :; do
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# Put both lines in ask prompt, rather than use a
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# separate 'echo' to ensure the entire question is
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# re-ask'ed after a '!' or '!foo' shell escape.
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eval "_dynlist=\"$_list\""
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eval "_dyndef=\"$_def\""
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# Clean away whitespace and determine the default
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set -o noglob
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set -- $_dyndef; _dyndef="$1"
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set -- $_dynlist; _dynlist="$*"
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set +o noglob
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[ $# -lt 1 ] && resp=done && return
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: ${_dyndef:=$1}
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echo "Available ${_name}s are: $_dynlist."
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echo -n "Which one $_query? (or 'done') "
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[ -n "$_dyndef" ] && echo -n "[$_dyndef] "
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_ask || continue
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[ -z "$resp" ] && resp="$_dyndef"
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# Quote $resp to prevent user from confusing isin() by
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# entering something like 'a a'.
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isin "$resp" $_dynlist done && break
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echo "'$resp' is not a valid choice."
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done
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}
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# Ask for user input until a non-empty reply is entered.
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#
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# $1 = the question to ask the user
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# $2 = the default answer
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#
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# Save the user input (or the default) in $resp.
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ask_until() {
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resp=
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while [ -z "$resp" ] ; do
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ask "$1" "$2"
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done
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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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# return last ipv4 address and mask
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#
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# $1 = interface
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#
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last_ipv4_addr_mask() {
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local _iface=$1
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ip addr show dev $_iface | awk '$1 == "inet" {print $2}' | tail -n1
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}
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valid_ip_and_prefix() {
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[ "$1" ] || return 0
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ipcalc -s -m $1 >/dev/null 2>&1 && ! ipcalc -s -m $1/0 >/dev/null 2>&1
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}
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# ask for hostname
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#
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# $1 = default
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#
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# retrusn hostname in global var $resp
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#
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ask_hostname() {
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while true; do
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ask "Hostname for new lxc container:" $1
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if [ -d /var/lib/lxc/$resp ]; then
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echo "/var/lib/lxc/$resp already exist"
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continue
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fi
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if [ -d /lxc/$resp ]; then
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echo "/lxc/$resp already exist"
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continue
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fi
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valid_hostname $resp && break
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done
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}
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ask_ifaceopts() {
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# get ip address(es)
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resp=
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local ifaceopts= _def= _iface=
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local ifaces=$(ip addr | awk -F: '$1 ~ /^[0-9]/ {printf "%s" $2} END {printf "\n"}')
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local last_iface=$(echo $ifaces | sed 's/.* //')
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while [ "$resp" != "done" ]; do
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if [ -z "$ifaces" ] || [ "$ifaces" = "lo " ] || [ -n "$ifaceopts" ]; then
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_def="done"
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else
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_def=$(echo $ifaces | sed 's/.* //')
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fi
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ask_which "network interface" "to use for $_hostname" \
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"$ifaces" $_def
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[ "$resp" = "done" ] && break
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_iface=$resp
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ifaces=$(rmel $_iface $ifaces)
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# suggested ip by last digit + 1
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_last_ip_mask=$(last_ipv4_addr_mask $_iface)
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_last_ip=${_last_ip_mask%/*}
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_last_ip_digit=${_last_ip##*.}
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_ip=${_last_ip%.*}.$((($_last_ip_digit + 1) % 256))
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_mask=${_last_ip_mask#*/}
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while true; do
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ask "Enter IP address/mask for $_iface:" $_ip/$_mask
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valid_ip_and_prefix "$resp" 2>&1 && break
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echo "$resp is not a valid IPv4 address/mask"
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done
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_ip_mask=$resp
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ifaceopts="$ifaceopts --interface $_iface:$_ip_mask"
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echo "lxc.network.ipv4 = $_iface/$_ip_mask" >> /tmp/lxc-$hostname.conf
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conffile=/tmp/lxc-$hostname.conf
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done
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resp="$conffile"
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}
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ask_template() {
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local temp
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# get template
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while true; do
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ask "Enter template file (or empty for generate a new):" \
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$_template
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if [ -z "$resp" ] || [ -r "$resp" ]; then
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break
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fi
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echo "Can not read $resp"
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done
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temp=$resp
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if [ -z "$temp" ]; then
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temp=/tmp/template.tar.gz
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echo "Generating template..."
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if setup-lxc-template -q -o $temp; then
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echo "ok"
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else
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echo "Failed to create template"
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exit 1
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fi
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fi
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resp=$temp
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}
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usage() {
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echo "Usage: ${0##*/} [-h] [HOSTNAME...]"
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exit 1
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}
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while getopts "h" opt; do
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case "$opt" in
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h) usage;;
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?) usage;;
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esac
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done
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shift $(($OPTIND - 1))
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if [ "$(whoami)" != "root" ]; then
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echo "Need to be root. Sorry."
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exit 1
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fi
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while true; do
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ask_hostname $1
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_hostname=$resp
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ask_ifaceopts
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_conffile=$resp
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ask_template
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_template=$resp
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lxc-create -n $_hostname \
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-f $_conffile \
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-t "$_template" \
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|| exit 1
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shift
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[ $# -le 0 ] && exit 0
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done
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