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check-gradle-checksums

Check your gradle-wrapper jar's checksum on CI. This is particularly useful for OSS projects.

Prerequisites

  • A Unix-like operating system: macOS, Linux, BSD. This may work on Windows, but I've not tested it.
  • sha256sum and curl should be installed
  • wget if you want to download via wget (more below)

It expects to be run from the root project directory, with gradle-wrapper.properties and gradle-wrapper.jar located in the conventional relative "gradle/wrapper" subdirectory of the root project directory. It expects the distribution to be "all" and not "bin".

- <rootProjectDir>
   - gradle
     - wrapper
       | gradle-wrapper.jar
       | gradle-wrapper.properties

My bash-fu isn't great and I'm sure this could be improved. PRs are also welcome to support more configuration (custom gradle-wrapper jar/properties locations, bin vs all, etc).

Usage

The script is executed by running one of the following commands in your terminal. You can do this via the command-line with either curl or wget. The script should be run from your gradle project's root directory.

Note: for the sh calls below, you may need to use bash directly if your CI environment's sh version doesn't support functions, such as on Travis-CI.

via curl

sh -c "$(curl -fsSL https://raw.githubusercontent.com/ZacSweers/check-gradle-checksums/master/check-gradle-checksums.sh)"

via wget

sh -c "$(wget -O- https://raw.githubusercontent.com/ZacSweers/check-gradle-checksums/master/check-gradle-checksums.sh)"

Manual inspection

It's a good idea to inspect the install script from projects you don't yet know. You can do that by downloading the install script first, looking through it so everything looks normal, then running it:

curl -Lo check-gradle-checksums.sh https://raw.githubusercontent.com/ZacSweers/check-gradle-checksums/master/check-gradle-checksums.sh
sh check-gradle-checksums.sh

Fixed version

If you want to only use a fixed version, you can use a fixed sha in the link above.

Example: https://raw.githubusercontent.com/ZacSweers/check-gradle-checksums/c8dc2ae0756a8041e240cdc6fa6c38c256dfeab0/check-gradle-checksums.sh

For idempotent builds, you should use a fixed version like the above. This repo will never rewrite git history.

License

Copyright (C) 2019 Zac Sweers

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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Check your gradle-wrapper jar's checksum on CI

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