RepoProject: read the "upstream" attribute of a project

The manifest spec [1] defines the "upstream" attribute: "name of the
git ref in which a sha1 can be found", when the revision is a
sha1. The parser is ignoring it, but RepoCommand could use it to
populate the "ref=" field of pinned submodules.

Parse the value and store it in the RepoProject.

RepoProject is public API and the current constructors are not
telescopic, so we cannot just add a new constructor with an extra
argument. Use plain getter/setters.j

[1] https://gerrit.googlesource.com/git-repo/+/master/docs/manifest-format.md#Element-project

Change-Id: Ia50b85b95bfd3710f9fbda2050be5950dd686941
(cherry picked from commit 1dd6324d4b4d9596813b18a44e315295f559ea12)

3 files changed, 67 insertions, 0 deletions

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/ManifestParserTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/ManifestParserTest.java
index 20958a812c..76176fe347 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/ManifestParserTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/ManifestParserTest.java
@@ -11,6 +11,7 @@ package org.eclipse.jgit.gitrepo;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
@@ -18,7 +19,9 @@ import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.net.URI;
 import java.util.HashSet;
+import java.util.Map;
 import java.util.Set;
+import java.util.function.Function;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -138,6 +141,42 @@ public class ManifestParserTest {
 						.collect(Collectors.toSet()));
 	}
 
+	@Test
+	public void testPinProjectWithUpstream() throws Exception {
+		StringBuilder xmlContent = new StringBuilder();
+		xmlContent.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
+				.append("<manifest>")
+				.append("<remote name=\"remote1\" fetch=\".\" />")
+				.append("<default revision=\"master\" remote=\"remote1\" />")
+				.append("<project path=\"foo\" name=\"pin-with-upstream\"")
+				.append("  revision=\"9b2fe85c0279f4d5ac69f07ddcd48566c3555405\"")
+				.append("  upstream=\"branchX\"/>")
+				.append("<project path=\"bar\" name=\"pin-without-upstream\"")
+				.append("  revision=\"76ce6d91a2e07fdfcbfc8df6970c9e98a98e36a0\" />")
+				.append("</manifest>");
+
+		ManifestParser parser = new ManifestParser(null, null, "master",
+				"https://git.google.com/", null, null);
+		parser.read(new ByteArrayInputStream(
+				xmlContent.toString().getBytes(UTF_8)));
+
+		Map<String, RepoProject> repos = parser.getProjects().stream().collect(
+				Collectors.toMap(RepoProject::getName, Function.identity()));
+		assertEquals(2, repos.size());
+
+		RepoProject foo = repos.get("pin-with-upstream");
+		assertEquals("pin-with-upstream", foo.getName());
+		assertEquals("9b2fe85c0279f4d5ac69f07ddcd48566c3555405",
+				foo.getRevision());
+		assertEquals("branchX", foo.getUpstream());
+
+		RepoProject bar = repos.get("pin-without-upstream");
+		assertEquals("pin-without-upstream", bar.getName());
+		assertEquals("76ce6d91a2e07fdfcbfc8df6970c9e98a98e36a0",
+				bar.getRevision());
+		assertNull(bar.getUpstream());
+	}
+
 	void testNormalize(String in, String want) {
 		URI got = ManifestParser.normalizeEmptyPath(URI.create(in));
 		if (!got.toString().equals(want)) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java b/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java
index 957b3869f2..7402c760c3 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java
@@ -176,6 +176,8 @@ public class ManifestParser extends DefaultHandler {
 					attributes.getValue("groups"));
 			currentProject
 					.setRecommendShallow(attributes.getValue("clone-depth"));
+			currentProject
+					.setUpstream(attributes.getValue("upstream"));
 			break;
 		case "remote":
 			String alias = attributes.getValue("alias");
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoProject.java b/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoProject.java
index 8deb7386a6..aa1af21d23 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoProject.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoProject.java
@@ -38,6 +38,7 @@ public class RepoProject implements Comparable<RepoProject> {
 	private final Set<String> groups;
 	private final List<CopyFile> copyfiles;
 	private final List<LinkFile> linkfiles;
+	private String upstream;
 	private String recommendShallow;
 	private String url;
 	private String defaultRevision;
@@ -389,6 +390,31 @@ public class RepoProject implements Comparable<RepoProject> {
 		this.linkfiles.clear();
 	}
 
+	/**
+	 * Return the upstream attribute of the project
+	 *
+	 * @return the upstream value if present, null otherwise.
+	 *
+	 * @since 6.10
+	 */
+	public String getUpstream() {
+		return this.upstream;
+	}
+
+	/**
+	 * Set the upstream attribute of the project
+	 *
+	 * Name of the git ref in which a sha1 can be found, when the revision is a
+	 * sha1.
+	 *
+	 * @param upstream value of the attribute in the manifest
+	 *
+	 * @since 6.10
+	 */
+	void setUpstream(String upstream) {
+		this.upstream = upstream;
+	}
+
 	private String getPathWithSlash() {
 		if (path.endsWith("/")) { //$NON-NLS-1$
 			return path;