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#!/bin/sh
# vi: ts=4 noexpandtab syntax=sh
ETC_CONFIG=/etc/ec2-init/is-compat-env
CONFIG_ACTIVE_VAR="compat"
CMDLINE_EC2_COMPAT=ec2init
CR="
"
VERBOSE=1
META_DATA_URL=http://169.254.169.254/2009-04-04
check_md=0
Usage() {
cat <<EOF
Usage: ${0##*/} [options]
indicate whether or not this appears to be an ec2 environment
a exit value:
0 indicates this is ec2
1 indicates this is not ec2
options:
-h | --help display usage
-m | --meta-data check metadata service
-q | --quiet do not output 'yes' or 'no', only exit properly
EOF
}
xit() {
ret=${1:-1}
if [ "${VERBOSE}" != "0" ]; then
[ "$ret" = "0" ] && echo yes || echo no
fi
exit "$ret";
}
while [ $# -ne 0 ]; do
case "$1" in
-q|--quiet) VERBOSE=0;;
-h|--help) Usage; exit 0;;
-m|--use-meta-data) check_md=1;;
*) Usage 1>&2; exit 2;;
esac
shift;
done
if [ ${check_md} -ne 0 ]; then
# if we are to check for meta data service
# then check first that there was something there.
index=$(wget --connect-timeout=2 --tries 2 -O - -q "${META_DATA_URL}") ||
xit 1
# exit true if content of url a line with 'meta-data' at start
[ "${index#*${CR}meta-data}" = "${index}" ] || xit 0
xit 1
fi
# if /proc/cmdline exists and has certain tokens, trust them
# even before looking at config file
if [ -e /proc/cmdline ] && read cmdline < /proc/cmdline; then
# if cmdline has certain tokens in it, trust them
case " ${cmdline} " in
*\ ${CMDLINE_EC2_COMPAT}=1\ *) xit 0;;
*\ ${CMDLINE_EC2_COMPAT}=0\ *) xit 1;;
esac
fi
# if the config file exists and has a non-empty value set for
# CONFIG_ACTIVE_VAR trust it as definitive source. If no value is set
# fall through
if [ -e "${ETC_CONFIG}" ] &&
active=$(sh -c "unset ${CONFIG_ACTIVE_VAR};
. '${ETC_CONFIG}'; echo \${${CONFIG_ACTIVE_VAR}}") &&
[ -n "${active}" ]; then
[ "$active" = "1" ] && xit 0
xit 1
fi
xit 1
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