Gradle - "override" behaviour/properties from build.gradle - jenkins

Question

I'm not a Gradle expert by any means so please be gentle...
I have a Gradle build which I'm trying to run on Jenkins. The build.gradle contains the following:
repositories {
maven {
url "http://some_internal_corporate_repo"
}
}
The Jenkins server that I am running the job on cannot access "some_internal_corporate_repo".
As I can't modify the build.gradle I would like to know if there's a way I can somehow extend or override the build.gradle, on the Jenkins server, to point to mavenCentral (or similar), maybe via an init file or setting a property etc?
Thanks in advance
EDIT: in the end, because I was using Jenkins, I used it's Groovy support (execute Groovy build step) to address my issue:
def file = new File('build.gradle')
def newConfig = file.text.replace('url "http://some_internal_corporate_repo"', 'url "http://repo.maven.apache.org/maven2/"')
file.text = newConfig

Answer 1

You can define multiple repositories.
The order of declaration determines how Gradle will check for dependencies at runtime
repositories {
maven {
url "http://some_internal_corporate_repo"
}
mavenCentral()
}
You can use a properties to define the maven repo url:
repositories {
maven {
url "${repositories_maven_url}"
}
}
In the gradle.properties file
repositories_maven_url=maven_url
According to the gradle documentation, gradle.properties files are applied in the following order:
gradle.properties in project root directory.
gradle.properties in GRADLE_USER_HOME directory.
system properties, e.g. when -Dgradle.user.home is set on the command line.
Or you can use something like this:
repositories {
maven {
url getMavenUrl()
}
}
/**
* Returns the url of the maven repo.
* Set this value in your ~/.gradle/gradle.properties with repositories_maven_url key
* If the property is not defined returns a default value
* #return
*/
def getMavenUrl() {
return hasProperty('repositories_maven_url') ? repositories_maven_url : "YOUR_DEFAULT_VALUE"
}