Explicit value check for logging (#40)

* Explicit value check for logging
* Update to go1.18

Dockerfile.minimal

@@ -1,9 +1,9 @@
-FROM golang:1.15-buster
+FROM golang:1.18
 
 # Install script_exporter and dependencies.
-RUN go get github.com/m-lab/script_exporter
-RUN go get github.com/m-lab/ndt5-client-go/cmd/ndt5-client
-RUN go get github.com/m-lab/locate/cmd/monitoring-token
+RUN go install github.com/m-lab/script_exporter@v1.2.0
+RUN go install github.com/m-lab/ndt5-client-go/cmd/ndt5-client@v0.1.0
+RUN go install github.com/m-lab/locate/cmd/monitoring-token@v0.14.10
 
 # Install java for the wehe cli client, and clone client repo
 # Install tini: https://github.com/krallin/tini

cache_exit_code.sh

@@ -27,10 +27,10 @@ if [[ -z ${2} ]]; then
     exit $STATE_CRITICAL
 fi
 
-if [[ -n "$LOGX_DEBUG" ]] ; then
+if [[ "$LOGX_DEBUG" == "true" ]] ; then
     # Enable additional execution logs for debugging.
     set -x
-    exec 1>> /tmp/${TARGET}.log 2>&1
+    exec 1> /tmp/${TARGET}.log 2>&1
 fi
 
 set -u