| ## Devil Util |
| |
| This directory builds tools used by the |
| [device interaction layer](https://chromium.googlesource.com/catapult/+/HEAD/devil/README.md), |
| which is also known as devil. |
| |
| The source for the tools are located here rather than inside devil since these |
| tools use chromium third_party sources that aren't available from catapult |
| (devil's project). |
| |
| When updating the source files here, please make sure to also update the |
| [prebuilt binaries inside devil](https://chromium.googlesource.com/catapult/+/HEAD/devil/devil/devil_dependencies.json). |
| |
| |
| ### More Comments Regarding Devil |
| |
| Devil tries to be supported in both chromium checkouts and also standalone |
| catapult checkouts, because bits of catapult including devil were getting |
| slurped into the android SDK at one point. |
| |
| The former can build devil_util from sources, and doing so lets you test out |
| changes to devil_util source files in chromium's CQ. However, the latter cannot |
| build devil_util from sources, so we fetch the prebuilt binaries from |
| Google Storage. |
| |
| When you update the devil_util source files in this directory, you can update |
| the prebuilt binaries in devil by running |
| [this script](https://chromium.googlesource.com/catapult/+/HEAD/devil/devil/utils/update_dependencies.py). |
