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Reduce default ec2net syslog noise; add optional debug logging #140

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Reduce default ec2net syslog noise; add optional debug logging #140

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14 changes: 12 additions & 2 deletions lib/lib.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,12 @@ declare imds_endpoint=""
declare imds_token=""
declare imds_interface=""

# Debug logging: when non-empty, debug messages are sent to syslog.
# Set via environment (e.g. systemd: Environment=EC2_NET_UTILS_DEBUG=1) or
# uncomment the next line for temporary local debugging:
# EC2_NET_UTILS_DEBUG=1
: "${EC2_NET_UTILS_DEBUG:=}"

make_token_request() {
local ep=${1:-""}
local interface=${2:-""}
Expand Down Expand Up @@ -124,8 +130,12 @@ log() {
logger --id=$$ --priority "${syslog_facility}.${priority}" --tag "$syslog_tag" "$@"
}

# When EC2_NET_UTILS_DEBUG is set (e.g. 1, true, yes), debug messages are logged.
# Omit the variable or set it empty to suppress debug (default).
debug() {
log debug "$@"
if [ -n "${EC2_NET_UTILS_DEBUG:-}" ]; then
log debug "$@"
fi
}

info() {
Expand Down Expand Up @@ -326,7 +336,7 @@ create_rules() {
# response.
addrs=$(get_iface_imds ${ether} ${local_addr_key} || true)
if [[ -z "$addrs" ]]; then
info "No addresses found for ${ether}"
debug "No addresses found for ${iface}"
return 0
fi

Expand Down