jamesarosen · June 5, 2021 18:39 · Jun 18, 2015 · Jun 18, 2015
diff --git a/two-travis-builds.md b/two-travis-builds.md
@@ -20,6 +20,8 @@ script:
   - (eval "$TEST_COMMAND")
 ```
 
+The `eval` inherits the current shell's environment, and the `(...)` wrapping creates a sub-shell to isolate this shell from the effects of `TEST_COMMAND`.
+
 ### Things That Didn't Work
 
 This was my first attempt. I still don't quite understand why it doesn't work.

diff --git a/two-travis-builds.md b/two-travis-builds.md
@@ -0,0 +1,44 @@
+I have a project that's been happily chugging along on [Travis](http://travis-ci.com) for a while. Its `.travis.yml` looks something like
+
+```yml
+script:
+  - node_modules/ember-cli/bin/ember test
+```
+
+I wanted to add a second parallel build that did something *very* different. I didn't want to run `ember test` with a different Ember version or some other flag. I wanted to run a completely different command. Specifically, I wanted to run [LicenseFinder](https://github.com/pivotal/LicenseFinder)'s audit.
+
+Travis has [great docs](http://docs.travis-ci.com/user/customizing-the-build/) on customizing parallel builds, but nothing describes how to do two completely different commands.
+
+I poked at Bash for a while and finally came up with
+
+```yml
+env:
+  - TEST_COMMAND="node_modules/ember-cli/bin/ember test"
+  - TEST_COMMAND="bundle exec license_finder"
+
+script:
+  - (eval "$TEST_COMMAND")
+```
+
+### Things That Didn't Work
+
+This was my first attempt. I still don't quite understand why it doesn't work.
+
+```yml
+script:
+  - $TEST_COMMAND
+```
+
+A second go breaks because I didn't wrap the argument to `bash -c` in quotes, meaning any arguments I tried to pass to `ember` got lost:
+
+```yml
+script:
+  - bash -c $TEST_COMMAND
+```
+
+But even wrapping it in quotes failed because `bash -c` loses too much of the environment:
+
+```yml
+script:
+  - bash -c "$TEST_COMMAND"
+```
No results found