There is already a gradle plugin which creates a debian out of a gradle project.
However, as far as I remember, that did had certain problems with the newer version of Gradle (2.2+) and in multi-module projects. (Unfortunately, it is too late to remember what exactly was the problem).
Anyhow, I wrote some custom gradle tasks, that just creates a debian package. Of course, the debian control files, and file heirarchies are project specific and needs to be changed as per requirements.
As mentioned, I added a couple of tasks, starting with the one allJar which creates a fat jar with all the complied class files :
task allJar(type: Jar, dependsOn: [subprojects.tasks['classes'], subprojects.sourcesJar, subprojects.jar, subprojects.copyToLib ] ) {
baseName = project.name + '-all'
subprojects.each { subproject ->
from subproject.configurations.archives.allArtifacts.files.collect {
zipTree(it)
}
}
manifest {
attributes 'Main-Class': mainClassName
}
}
The task copyToLib is used here to include any external jar files located in lib directories.
subprojects {
task copyToLib( type: Copy) {
into "$buildDir/libs/lib"
from configurations.runtime
}
}
After this, we can just add all the required tasks in one single file, for e.g., debian.gradle.
task copyJarDeps(type: Copy) {
from(subprojects.configurations.runtime)
into project.file('debian/package/usr/share/test-project')
}
task copyControlFiles(type: Copy) {
from './DEBIAN_CONTROL'
into project.file('debian/package/DEBIAN')
}
task copyAppConfigFiles(type: Copy) {
from 'rootProject/config'
into project.file('debian/package/etc/configName')
}
task copySwaggerFiles(type: Copy) {
from 'swagger'
into project.file('debian/package/usr/share/assets/swagger')
}
task copyDebRunScripts(type: Copy){
from './startup_script'
into project.file('debian/package/etc/init.d')
}
task copyMainClassJar(type: Copy, dependsOn: allJar){
from 'build/libs/root-project-all-0.1.0.jar'
into project.file('debian/package/usr/share/projectName')
}
task copyDebFiles(dependsOn: [copyJarDeps, copyAppConfigFiles, copyDebRunScripts, copyControlFiles, copySwaggerFiles])
task buildDeb(dependsOn: [allJar, copyDebFiles, copyMainClassJar]) {
}
Of course, the string constants are to be replaced as per requirements of the project. And so is the debian control files in the directory DEBIAN_CONTROL.
Now, we just include this file in the main build.gradle file :
apply from: file("gradle/debian.gradle")
Now, we can build a debian package by using the command :
./gradlew clean buildDeb