From 08af13a77fbab6221ee45bb741c186c01341ce46 Mon Sep 17 00:00:00 2001
From: Tianon Gravi <admwiggin@gmail.com>
Date: Mon, 29 Dec 2014 21:21:46 -0700
Subject: [PATCH 1/2] Update Travis to only gofmt against Go 1.3

Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>
---
 .travis.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index e55a42f1b7..72cb865430 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,5 +16,5 @@ install:
 
 script:
  - bash "$DOCKER_PATH/project/make/validate-dco"
- - bash "$DOCKER_PATH/project/make/validate-gofmt"
+ - if [[ "$TRAVIS_GO_VERSION" == 1.3* ]]; then bash "$DOCKER_PATH/project/make/validate-gofmt"; fi
  - go test -v ./...

From 8bc7cbdd1717be8ff33e3aa4b160b39f387547fa Mon Sep 17 00:00:00 2001
From: Tianon Gravi <admwiggin@gmail.com>
Date: Tue, 30 Dec 2014 17:01:03 -0700
Subject: [PATCH 2/2] Add cross-compilation to Travis

Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>
---
 .travis.yml | 66 +++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 57 insertions(+), 9 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 72cb865430..214cc90aa5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,19 +2,67 @@ language: go
 
 go:
   - 1.3
-  - 1.4
+#  - 1.4
+# see https://github.com/moovweb/gvm/pull/116 for why Go 1.4 is currently disabled
+
+# https://github.com/docker/libcontainer/blob/e9f44b52de03138d9273eadd5a87a0cea11b4f5d/.travis.yml
+
+# this section defines the majority of our "build matrix"
+# see http://docs.travis-ci.com/user/build-configuration/#The-Build-Matrix
+env:
+  - TRAVIS_GLOBAL_WTF=1 # since we don't want to re-run dco/gofmt checks for every single GOOS/GOARCH combination, we artificially create a separate build matrix cell here where those checks will be run (see the TRAVIS_GLOBAL_WTF checks in the script commands below)
+  - _GOOS=linux _GOARCH=amd64
+  - _GOOS=linux _GOARCH=386
+  - _GOOS=linux _GOARCH=arm
+  - _GOOS=darwin _GOARCH=amd64
+  - _GOOS=darwin _GOARCH=386
+  - _GOOS=windows _GOARCH=amd64
+  - _GOOS=windows _GOARCH=386
 
 # let us have speedy Docker-based Travis workers
 sudo: false
 
 install:
-  - export DOCKER_PATH="${GOPATH%%:*}/src/github.com/docker/docker"
-  - mkdir -pv "$DOCKER_PATH/project/make"
-  - ( cd "$DOCKER_PATH/project/make" && wget -c 'https://raw.githubusercontent.com/docker/docker/master/project/make/'{.validate,validate-dco,validate-gofmt} )
-  - sed -i 's!docker/docker!docker/swarm!' "$DOCKER_PATH/project/make/.validate"
-  - go get -t -v ./...
+  # setup our current repo as "github.com/docker/swarm" in the GOPATH
+  - mkdir -pv "${GOPATH%%:*}/src/github.com/docker"
+    && [ -d "${GOPATH%%:*}/src/github.com/docker/swarm" ]
+    || ln -sv "$(pwd -P)" "${GOPATH%%:*}/src/github.com/docker/swarm"
+  # grab the files from docker/docker that do DCO/gofmt checking (and make the minor adjustments necessary to make them do docker/swarm)
+  - if [ "$TRAVIS_GLOBAL_WTF" ]; then
+      export DOCKER_PATH="${GOPATH%%:*}/src/github.com/docker/docker";
+      mkdir -pv "$DOCKER_PATH/project/make";
+      ( cd "$DOCKER_PATH/project/make" && wget -c 'https://raw.githubusercontent.com/docker/docker/master/project/make/'{.validate,validate-dco,validate-gofmt} );
+      sed -i 's!docker/docker!docker/swarm!' "$DOCKER_PATH/project/make/.validate";
+    fi
+  # cross-compile the Go toolchain for the GOOS/GOARCH combo we're testing
+  - if [ -z "$TRAVIS_GLOBAL_WTF" ]; then
+      gvm cross "$_GOOS" "$_GOARCH";
+      export GOOS="$_GOOS" GOARCH="$_GOARCH";
+    fi
+  # snag any external Go dependencies
+  - if [ -z "$TRAVIS_GLOBAL_WTF" ]; then
+      go get -t -v ./...;
+    fi
+  # add some debugging output that's super helpful when adapting the Travis scripts (so that which environment variables are available in the exact situation being debugged can be seen easily, with real-life examples)
+  - env | sort
+  - go env
 
 script:
- - bash "$DOCKER_PATH/project/make/validate-dco"
- - if [[ "$TRAVIS_GO_VERSION" == 1.3* ]]; then bash "$DOCKER_PATH/project/make/validate-gofmt"; fi
- - go test -v ./...
+ - if [ "$TRAVIS_GLOBAL_WTF" ]; then
+     bash "$DOCKER_PATH/project/make/validate-dco";
+   fi
+ # check gofmt, but only on Go 1.3
+ - if [[ "$TRAVIS_GLOBAL_WTF" && "$TRAVIS_GO_VERSION" == go1.3* ]]; then
+     bash "$DOCKER_PATH/project/make/validate-gofmt";
+   fi
+ # when we're on the native GOHOSTOS/GOHOSTARCH, the test suite will run as-is, but for all other platforms, we only want to test compilation
+ - if [ -z "$TRAVIS_GLOBAL_WTF" ]; then
+     case "$(go env GOOS)/$(go env GOARCH)" in
+       $(go env GOHOSTOS)/$(go env GOHOSTARCH))
+         go test -v ./...;
+         ;;
+       *)
+         go build -v;
+         ;;
+     esac
+   fi