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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@|git://|https://|file:///)([^/:]+)[/:](.+)".r
def apply(
url: String, ref: String, subDirectory: Option[String] = None, // example: git://github.com/cvogt/cbt.git#<some-hash>
subBuild: Option[String] = None
)(implicit context: Context ): LazyDependency = withCheckoutDirectory(url, ref, subDirectory, subBuild)._2
def withCheckoutDirectory(
url: String, ref: String, subDirectory: Option[String] = None, // example: git://github.com/cvogt/cbt.git#<some-hash>
subBuild: Option[String] = None
)(implicit context: Context ): ( File, LazyDependency ) = {
lazy val moduleKey = (
this.getClass.getName
++ "(" ++ url ++ subDirectory.map("/" ++ _).getOrElse("") ++ "#" ++ ref
++ ", "
++ subBuild.mkString(", ")
++ ")"
)
val taskCache = new PerClassCache( context.transientCache, moduleKey )( context.logger )
val c = taskCache[Dependency]("checkout").memoize{ checkout(url, ref) }
val workingDirectory = subDirectory.map(c / _).getOrElse(c)
c -> DirectoryDependency(
context.copy(
workingDirectory = workingDirectory,
loop = false
),
subBuild
)
}
def checkout(url: String, ref: String)(implicit context: Context): File = {
// TODO: add support for authentication via ssh and/or https
// See http://www.codeaffine.com/2014/12/09/jgit-authentication/
val credentialsFile = context.workingDirectory ++ "/git.login"
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) )
}
val logger = context.logger
val GitUrl( _, domain, path ) = url
val checkoutDirectory = context.cache / s"git/$domain/${path.stripSuffix(".git")}/$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
}
}
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