testing travis

docker/Dockerfile.testing

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+FROM golang:1.10-stretch
+
+RUN apt-get update && apt-get -y install cron python3 sudo procps
+
+### Test and build ###
+# copy source code
+COPY main.go /go/src/github.com/dominicbreuker/pspy/main.go
+COPY cmd /go/src/github.com/dominicbreuker/pspy/cmd
+COPY internal /go/src/github.com/dominicbreuker/pspy/internal
+COPY vendor /go/src/github.com/dominicbreuker/pspy/vendor
+
+# run tests
+WORKDIR /go/src/github.com/dominicbreuker/pspy
+RUN go test ./...
+# build executable
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -ldflags '-extldflags "-static"' -o bin/pspy main.go
+
+### Prepare integration test ###
+# install root cronjob
+COPY docker/var/spool/cron/crontabs /var/spool/cron/crontabs
+RUN chmod 600 /var/spool/cron/crontabs/root
+COPY docker/root/scripts /root/scripts
+
+# set up unpriviledged user
+# allows passwordless sudo to start cron as root on startup
+RUN useradd -ms /bin/bash myuser && \
+    adduser myuser sudo && \
+    echo 'myuser ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+USER myuser
+
+
+# drop into bash shell
+COPY docker/entrypoint-testing.sh /entrypoint.sh
+RUN sudo chmod +x /entrypoint.sh
+CMD ["/entrypoint.sh"]

docker/entrypoint-testing.sh

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+#!/bin/bash
+
+sudo cron -f &
+sleep 1
+sudo ps | grep cron 1>/dev/null
+echo "[+] cron started"
+
+echo "[+] Running as user `id`"
+
+echo "[+] Executing test"
+# exec /bin/bash
+rm /home/myuser/log.txt
+bin/pspy > /home/myuser/log.txt &
+
+for i in `seq 1 25`; do
+    echo "Waiting for cron job detection..."
+    sleep 5;
+
+    QUERY_RESULT=$(grep ' | passwd myuser' /home/myuser/log.txt | grep -v grep)
+    if [ "'$QUERY_RESULT'" != "''"  ]; then
+        echo "Cron job execution detected!"
+        echo "Complete log of pspy (may contain commands run in this test):"
+        cat /home/myuser/log.txt
+        exit 0
+    fi
+done
+echo "Failed to detect cron job..."
+exit 1