travis: add basic travis configuration for repoman

sdk_container/src/third_party/coreos-overlay/.travis.yml

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+# Derived from https://github.com/mrueg/repoman-travis/
+
+sudo: required
+language: python
+python:
+    - pypy
+
+# For some reason portage is defaulting to lbzip2/lbunzip2 here and then complaining when they don't
+# exist, so use plain old b{,un}zip2.
+env:
+    - PORTAGE_VER="2.3.40" PORTAGE_BZIP2_COMMAND="bzip2" PORTAGE_BUNZIP2_COMMAND="bunzip2"
+
+before_install:
+    - sudo apt-get -qq update
+    - pip install lxml pyyaml
+
+before_script: ./.travis/setup_repoman.sh
+
+script:
+    - cd /usr/coreos-overlay
+    - /tmp/portage/portage-${PORTAGE_VER}/repoman/bin/repoman --experimental-repository-modules=y -dx full

sdk_container/src/third_party/coreos-overlay/.travis/coreos.conf

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+[DEFAULT]
+main-repo = portage-stable
+
+[coreos]
+location = /usr/coreos-overlay
+
+[portage-stable]
+location = /usr/portage

sdk_container/src/third_party/coreos-overlay/.travis/setup_repoman.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+# Set up directory permissions/portage user and group.
+sudo chmod a+rwX /etc/passwd /etc/group /etc /usr
+echo "portage:x:250:250:portage:/var/tmp/portage:/bin/false" >> /etc/passwd
+echo "portage::250:portage,travis" >> /etc/group
+
+# Shuffle portage repositories around into the right places.
+mkdir -p /etc/portage/repos.conf /usr/coreos-overlay
+mv * /usr/coreos-overlay/
+mv .git /usr/coreos-overlay/
+git clone https://github.com/coreos/portage-stable /usr/portage/
+cp .travis/coreos.conf /etc/portage/repos.conf/
+ln -s /usr/coreos-overlay/profiles/coreos/amd64/sdk /etc/portage/make.profile
+mkdir -p /usr/portage/metadata/{dtd,xml-schema}
+wget -O /usr/portage/metadata/dtd/metadata.dtd https://www.gentoo.org/dtd/metadata.dtd
+wget -O /usr/portage/metadata/xml-schema/metadata.xsd https://www.gentoo.org/xml-schema/metadata.xsd
+
+# Download portage.
+mkdir /tmp/portage && cd /tmp/portage
+wget -qO - "https://gitweb.gentoo.org/proj/portage.git/snapshot/portage-${PORTAGE_VER}.tar.gz" | tar xz