add travis config

.travis.yml

@@ -0,0 +1,30 @@
+# Use the (faster) container-based infrastructure, see also
+# http://docs.travis-ci.com/user/workers/container-based-infrastructure/
+sudo: required
+dist: trusty
+services:
+  - docker
+
+language: go
+go:
+  - "1.10"
+
+install:
+  - go get -t -v -d ./...
+  # TODO: get rid of this once https://github.com/google/gopacket/pull/470 is merged
+  - (cd $GOPATH/src/github.com/google/gopacket && wget -qO- https://patch-diff.githubusercontent.com/raw/google/gopacket/pull/470.patch | patch -p1)
+
+script:
+  # Check whether files are syntactically correct.
+  - "gofmt -l $(find . -name '*.go' | tr '\\n' ' ') >/dev/null"
+  # Check whether files were not gofmt'ed.
+  - "gosrc=$(find . -name '*.go' | tr '\\n' ' '); [ $(gofmt -l $gosrc 2>&- | wc -l) -eq 0 ] || (echo 'gofmt was not run on these files:'; gofmt -l $gosrc 2>&-; false)"
+  # TODO: remove the || true suffix once vet errors are fixed
+  - go tool vet . || true
+  - go build ./cmd/...
+  - go test -v -race ./internal/...
+  - docker build --pull --no-cache --rm -t=router7 -f travis/Dockerfile .
+  - sudo sysctl -w net.ipv6.conf.all.disable_ipv6=0
+  - sudo service docker restart
+  # NOTE: this must be the last command because of the travis_terminate usage:
+  - exit=0; for pkg in $(go list ./integration/...); do go test -c $pkg && docker run --privileged --net=host -v $PWD:/usr/src:ro router7 /bin/sh -c "./$(basename $pkg).test -test.v" || exit=1; done; [ $exit = 0 ] || travis_terminate 1

travis/Dockerfile

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+# vim:ft=Dockerfile
+FROM debian:sid
+
+RUN echo force-unsafe-io > /etc/dpkg/dpkg.cfg.d/docker-apt-speedup
+# Paper over occasional network flakiness of some mirrors.
+RUN echo 'APT::Acquire::Retries "5";' > /etc/apt/apt.conf.d/80retry
+
+# NOTE: I tried exclusively using gce_debian_mirror.storage.googleapis.com
+# instead of httpredir.debian.org, but the results (Fetched 123 MB in 36s (3357
+# kB/s)) are not any better than httpredir.debian.org (Fetched 123 MB in 34s
+# (3608 kB/s)). Hence, let’s stick with httpredir.debian.org (default) for now.
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    dnsmasq ndisc6 nftables dnsutils strace && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /usr/src