当build.sbt不在根目录中时在Travis中生成Scala项目

我有一个项目，其中

build.sbt

不在根目录中，而是在子目录

build sbt

中（原因在这里并不重要）。我想我可以让Travis.CI使用以下方法来构建它：

language: scala

scala:
  - 2.11.8

jdk:
  - oraclejdk8
  - openjdk7
  - openjdk6

env:
  - TRAVIS_BUILD_DIR=$TRAVIS_BUILD_DIR/build-sbt

然而，它甚至不尝试使用sbt，而是假设，可能是因为它在更改目录之前首先在根目录中查找，并在这里找到来自过时Ant构建的

build.xml

。所以Travis尝试运行Ant，但它不应该：

$ git clone --depth=50 --branch=sbtfied https://github.com/Sciss/weblaf.git Sciss/weblaf

Cloning into 'Sciss/weblaf'...    
remote: Counting objects: 7617, done.
remote: Compressing objects: 100% (4211/4211), done.
remote: Total 7617 (delta 4486), reused 5189 (delta 2765), pack-reused 0
Receiving objects: 100% (7617/7617), 11.24 MiB | 19.61 MiB/s, done.
Resolving deltas: 100% (4486/4486), done.
Checking connectivity... done.

$ cd Sciss/weblaf
$ git checkout -qf 33e4986d7e678a732cf8e18d9e4bedc8a967e3de
This job is running on container-based infrastructure, which does not allow use of 'sudo', setuid and setguid executables.
If you require sudo, add 'sudo: required' to your .travis.yml
See https://docs.travis-ci.com/user/workers/container-based-infrastructure/ for details.
Setting environment variables from .travis.yml
$ export TRAVIS_BUILD_DIR=$TRAVIS_BUILD_DIR/build-sbt
$ jdk_switcher use oraclejdk8
Switching to Oracle JDK8 (java-8-oracle), JAVA_HOME will be set to /usr/lib/jvm/java-8-oracle
$ java -Xmx32m -version
java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)
$ javac -J-Xmx32m -version
javac 1.8.0_31
Using Scala 2.11.8
$ ant test
Buildfile: build.xml does not exist!

Build failed
The command "ant test" exited with 1.

---

以下脚本可以工作，而不是设置环境变量：

script:
  - cd build-sbt
  - sbt ++$TRAVIS_SCALA_VERSION test

---

以下脚本可以工作，而不是设置环境变量：

script:
  - cd build-sbt
  - sbt ++$TRAVIS_SCALA_VERSION test