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#!/bin/sh
set -f
LOG=""
DEBUG_LEVEL=1
LOG_D="/run"
ENABLE="enabled"
DISABLE="disabled"
CLOUD_SYSTEM_TARGET="/lib/systemd/system/cloud-init.target"
CLOUD_TARGET_NAME="cloud-init.target"
# lxc sets 'container', but lets make that explicitly a global
CONTAINER="${container}"
debug() {
local lvl="$1"
shift
[ "$lvl" -gt "$DEBUG_LEVEL" ] && return
if [ -z "$LOG" ]; then
local log="$LOG_D/${0##*/}.log"
{ : > "$log"; } >/dev/null 2>&1 && LOG="$log" ||
LOG="/dev/kmsg"
fi
echo "$@" >> "$LOG"
}
etc_file() {
local pprefix="${1:-/etc/cloud/cloud-init.}"
_RET="unset"
[ -f "${pprefix}$ENABLE" ] && _RET="$ENABLE" && return 0
[ -f "${pprefix}$DISABLE" ] && _RET="$DISABLE" && return 0
return 0
}
read_proc_cmdline() {
# return /proc/cmdline for non-container, and /proc/1/cmdline for container
local ctname="systemd"
if [ -n "$CONTAINER" ] && ctname=$CONTAINER || systemd-detect-virt --container --quiet; then
local
if _RET=$(tr '\0' ' ' < /proc/1/cmdline) >/dev/null 2>&1; then
_RET_MSG="container[$ctname]: pid 1 cmdline"
return
fi
_RET=""
_RET_MSG="container[$ctname]: pid 1 cmdline not available"
return 0
fi
_RET_MSG="/proc/cmdline"
read _RET < /proc/cmdline
}
kernel_cmdline() {
local cmdline="" tok=""
if [ -n "${KERNEL_CMDLINE+x}" ]; then
# use KERNEL_CMDLINE if present in environment even if empty
cmdline=${KERNEL_CMDLINE}
debug 1 "kernel command line from env KERNEL_CMDLINE: $cmdline"
elif read_proc_cmdline; then
read_proc_cmdline && cmdline="$_RET"
debug 1 "kernel command line ($_RET_MSG): $cmdline"
fi
_RET="unset"
cmdline=" $cmdline "
tok=${cmdline##* cloud-init=}
[ "$tok" = "$cmdline" ] && _RET="unset"
tok=${tok%% *}
[ "$tok" = "$ENABLE" -o "$tok" = "$DISABLE" ] && _RET="$tok"
return 0
}
default() {
_RET="$ENABLE"
}
main() {
local normal_d="$1" early_d="$2" late_d="$3"
local target_name="multi-user.target" gen_d="$early_d"
local link_path="$gen_d/${target_name}.wants/${CLOUD_TARGET_NAME}"
debug 1 "$0 normal=$normal_d early=$early_d late=$late_d"
debug 2 "$0 $*"
local search result="error" ret=""
for search in kernel_cmdline etc_file default; do
if $search; then
debug 1 "$search found $_RET"
[ "$_RET" = "$ENABLE" -o "$_RET" = "$DISABLE" ] &&
result=$_RET && break
else
ret=$?
debug 0 "search $search returned $ret"
fi
done
if [ "$result" = "$ENABLE" ]; then
if [ -e "$link_path" ]; then
debug 1 "already enabled: no change needed"
else
[ -d "${link_path%/*}" ] || mkdir -p "${link_path%/*}" ||
debug 0 "failed to make dir $link_path"
if ln -snf "$CLOUD_SYSTEM_TARGET" "$link_path"; then
debug 1 "enabled via $link_path -> $CLOUD_SYSTEM_TARGET"
else
ret=$?
debug 0 "[$ret] enable failed:" \
"ln $CLOUD_SYSTEM_TARGET $link_path"
fi
fi
elif [ "$result" = "$DISABLE" ]; then
if [ -f "$link_path" ]; then
if rm -f "$link_path"; then
debug 1 "disabled. removed existing $link_path"
else
ret=$?
debug 0 "[$ret] disable failed, remove $link_path"
fi
else
debug 1 "already disabled: no change needed [no $link_path]"
fi
else
debug 0 "unexpected result '$result'"
ret=3
fi
return $ret
}
main "$@"
# vi: ts=4 expandtab
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