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package cbt
import java.io._
import java.nio.file.Files.readAllBytes
import java.net._
import org.eclipse.jgit.api._
import org.eclipse.jgit.internal.storage.file._
import org.eclipse.jgit.transport.UsernamePasswordCredentialsProvider
import org.eclipse.jgit.lib.Ref
object GitDependency{
val GitUrl = "(git:|https:|file:/)//([^/]+)/(.+)".r
}
case class GitDependency(
url: String, ref: String, subDirectory: Option[String] = None // example: git://github.com/cvogt/cbt.git#<some-hash>
)(implicit val logger: Logger, classLoaderCache: ClassLoaderCache, context: Context ) extends DependencyImplementation{
import GitDependency._
override def lib = new Lib(logger)
def moduleKey = this.getClass.getName ++ "(" ++ url ++ subDirectory.map("/" ++ _).getOrElse("") ++ "#" ++ ref ++ ")"
def transientCache = context.transientCache
// TODO: add support for authentication via ssh and/or https
// See http://www.codeaffine.com/2014/12/09/jgit-authentication/
private val GitUrl( _, domain, path ) = url
private val credentialsFile = context.projectDirectory ++ "/git.login"
private def authenticate(_git: CloneCommand) =
if(!credentialsFile.exists){
_git
} else {
val (user, password) = {
// TODO: implement safer method than reading credentials from plain text file
val c = new String(readAllBytes(credentialsFile.toPath)).split("\n").head.trim.split(":")
(c(0), c.drop(1).mkString(":"))
}
_git.setCredentialsProvider( new UsernamePasswordCredentialsProvider(user, password) )
}
def checkout: File = taskCache[GitDependency]("checkout").memoize{
val checkoutDirectory = context.cache ++ s"/git/$domain/$path/$ref"
val _git = if(checkoutDirectory.exists){
logger.git(s"Found existing checkout of $url#$ref in $checkoutDirectory")
val _git = new Git(new FileRepository(checkoutDirectory ++ "/.git"))
val actualRef = _git.getRepository.getBranch
if(actualRef != ref){
logger.git(s"actual ref '$actualRef' does not match expected ref '$ref' - fetching and checking out")
_git.fetch().call()
_git.checkout().setName(ref).call
}
_git
} else {
logger.git(s"Cloning $url into $checkoutDirectory")
val _git = authenticate(
Git
.cloneRepository()
.setURI(url)
.setDirectory(checkoutDirectory)
).call()
logger.git(s"Checking out ref $ref")
_git.checkout().setName(ref).call()
_git
}
val actualRef = _git.getRepository.getBranch
assert( actualRef == ref, s"actual ref '$actualRef' does not match expected ref '$ref'")
checkoutDirectory
}
def dependency = taskCache[GitDependency]("dependency").memoize{
DirectoryDependency(
context.copy(
projectDirectory = checkout ++ subDirectory.map("/" ++ _).getOrElse("")
)
)
}
def dependencies = Seq(dependency)
def exportedClasspath = ClassPath()
private[cbt] def targetClasspath = exportedClasspath
def needsUpdate: Boolean = false
}
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