Bring back support for darwin

.travis.yml

@@ -8,14 +8,14 @@ install:
   - curl -sL -o glide.tgz https://github.com/Masterminds/glide/releases/download/v0.12.3/glide-v0.12.3-linux-amd64.tar.gz
   - tar -xvf glide.tgz
   - linux-amd64/glide install
-  - curl -sL -o upx.txz https://github.com/upx/upx/releases/download/v3.93/upx-3.93-amd64_linux.tar.xz
+  - curl -sL -o upx.txz https://github.com/upx/upx/releases/download/v3.94/upx-3.94-amd64_linux.tar.xz
   - tar -xvf upx.txz
 
 script: ls
 
 after_success:
-  - CGO_ENABLED=0 gox -arch="amd64" -os="windows linux" -ldflags="-X main.ApplicationVersion=$(git describe --tags)"
-  - upx-3.93-amd64_linux/upx pstore_*
+  - CGO_ENABLED=0 gox -arch="amd64" -os="windows darwin linux" -ldflags="-X main.ApplicationVersion=$(git describe --tags)"
+  - upx-3.94-amd64_linux/upx pstore_*
 
 deploy:
   provider: releases
@@ -24,6 +24,7 @@ deploy:
   skip_cleanup: true
   file:
     - pstore_linux_amd64
+    - pstore_darwin_amd64
     - pstore_windows_amd64.exe
   on:
     tags: true

exec_darwin.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"os"
+	"os/exec"
+	"fmt"
+	"syscall"
+)
+
+func ExecCommand(args []string) {
+	if len(args) == 0 {
+		abort(usageError, "no command specified")
+	}
+	commandName := args[0]
+	commandPath, err := exec.LookPath(commandName)
+	if err != nil {
+		abort(commandNotFoundError, fmt.Sprintf("cannot find '%s'", commandName))
+	}
+	err = syscall.Exec(commandPath, args, os.Environ())
+	if err != nil {
+		abort(execError, err)
+	}
+}