Gradle: How to perform git pull through gradle?

Question

I want to pull changes from git repo before compilation begins. I found this Gradle: how to clone a git repo in a task?, but it clones the repo instead of fetching just the cha

Answer 1

The following gradle script should be helpful:

import org.ajoberstar.grgit.*

buildscript {
   repositories { 
      mavenCentral() 
   }
   dependencies { 
      classpath 'org.ajoberstar:gradle-git:1.1.0' 
   }
}

task pull << {
   def grgit = Grgit.open(dir: project.file('.'))
   grgit.pull(rebase: false)
}

Answer 2

You can create Exec task and run any shell/cmd command. No extra plugin dependency required for simple tasks.

task gitPull(type: Exec) {
    description 'Pulls git.'
    commandLine "git", "pull"
}

Usage: gradlew gitPull

You should see smth like this:

gradlew gitPull 
Parallel execution is an incubating feature.
:app:gitPull 
Already up-to-date.

BUILD SUCCESSFUL

Total time: 9.232 secs

Where Already up-to-date. is the output from git pull command.