artifact.rb in buildr-1.2.8

- old
+ new

@@ -35,10 +35,14 @@
     # The version number.
     attr_reader :version
     # Optional artifact classifier.
     attr_reader :classifier
 
+    def snapshot?
+      version =~ /-SNAPSHOT$/
+    end
+
     # :call-seq:
     #   to_spec_hash() => Hash
     #
     # Returns the artifact specification as a hash. For example:
     #   com.example:app:jar:1.2
@@ -125,10 +129,14 @@
     def apply_spec(spec)
       spec = Artifact.to_hash(spec)
       ARTIFACT_ATTRIBUTES.each { |key| instance_variable_set("@#{key}", spec[key]) }
       self
     end
+    
+    def group_path
+      group.gsub(".", "/")
+    end
 
   end
 
  
   # A file task referencing an artifact in the local repository.
@@ -293,29 +301,69 @@
     #
     # This method attempts to download the artifact from each repository in the order in
     # which they are returned from #remote, until successful. It always downloads the POM first.
     def download()
       puts "Downloading #{to_spec}" if Rake.application.options.trace
-      remote = Buildr.repositories.remote
+      remote = Buildr.repositories.remote.map { |repo_url| URI === repo_url ? repo_url : URI.parse(repo_url) }
+      remote = remote.each { |repo_url| repo_url.path += "/" unless repo_url.path[-1] == "/" }
       fail "No remote repositories defined!" if remote.empty?
-      remote.find do |repo_url|
-        repo_url = URI.parse(repo_url) unless URI === repo_url
-        repo_url.path += "/" unless repo_url.path[-1] == "/"
+      exact_success = remote.find do |repo_url|
         begin
-          path = group.gsub(".", "/") + "/#{id}/#{version}/#{File.basename(name)}"
+          path = "#{group_path}/#{id}/#{version}/#{File.basename(name)}"
           mkpath File.dirname(name), :verbose=>false
           URI.download repo_url + path, name
           true
         rescue URI::NotFoundError
           false
         rescue Exception=>error
           puts error if verbose
           puts error.backtrace.join("\n") if Rake.application.options.trace
           false
         end
-      end or fail "Failed to download #{to_spec}, tried the following repositories:\n#{remote.join("\n")}"
+      end
+
+      if exact_success
+        return
+      elsif snapshot?
+        download_m2_snapshot(remote)
+      else
+        fail_download(remote)
+      end
     end
 
+    def download_m2_snapshot(remote_uris)
+      remote_uris.find do |repo_url|
+        snapshot_url = current_snapshot_repo_url(repo_url)
+        if snapshot_url
+          begin
+            URI.download snapshot_url, name
+          rescue URI::NotFoundError
+            false
+          end
+        else
+          false
+        end
+      end or fail_download(remote_uris)
+    end
+
+    def current_snapshot_repo_url(repo_url)
+      begin
+        metadata_path = "#{group_path}/#{id}/#{version}/maven-metadata.xml"
+        metadata_xml = StringIO.new
+        URI.download repo_url + metadata_path, metadata_xml
+        metadata = REXML::Document.new(metadata_xml.string).root
+        timestamp = REXML::XPath.first(metadata, "//timestamp").text
+        build_number = REXML::XPath.first(metadata, "//buildNumber").text
+        snapshot_of = version[0, version.size - 9]
+        repo_url + "#{group_path}/#{id}/#{version}/#{id}-#{snapshot_of}-#{timestamp}-#{build_number}.#{type}"
+      rescue URI::NotFoundError
+        nil
+      end
+    end
+
+    def fail_download(remote_uris)
+      fail "Failed to download #{to_spec}, tried the following repositories:\n#{remote_uris.join("\n")}"
+    end
   end
 
 
   # Holds the path to the local repository, URLs for remote repositories, and settings for release server.
   #