Check assume unchanged flag in Add command

When the assume unchanged flag is set the Add command must not update
the index for this file if any changes are present in the working
directory.

Bug: 331351
Change-Id: I255870f689225a1d88971182e0eb377952641b42
Signed-off-by: Stefan Lay <stefan.lay@sap.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/AddCommandTest.java

@@ -456,6 +456,38 @@ public class AddCommandTest extends RepositoryTestCase {
 				indexState(CONTENT));
 	}
 
+	public void testAssumeUnchanged() throws Exception {
+		Git git = new Git(db);
+		String path = "a.txt";
+		writeTrashFile(path, "content");
+		git.add().addFilepattern(path).call();
+		String path2 = "b.txt";
+		writeTrashFile(path2, "content");
+		git.add().addFilepattern(path2).call();
+		git.commit().setMessage("commit").call();
+		assertEquals("[a.txt, mode:100644, content:"
+				+ "content, assume-unchanged:false]"
+				+ "[b.txt, mode:100644, content:content, "
+				+ "assume-unchanged:false]", indexState(CONTENT
+				| ASSUME_UNCHANGED));
+		assumeUnchanged(path2);
+		assertEquals("[a.txt, mode:100644, content:content, "
+				+ "assume-unchanged:false][b.txt, mode:100644, "
+				+ "content:content, assume-unchanged:true]", indexState(CONTENT
+				| ASSUME_UNCHANGED));
+		writeTrashFile(path, "more content");
+		writeTrashFile(path2, "more content");
+
+		git.add().addFilepattern(".").call();
+
+		assertEquals("[a.txt, mode:100644, content:more content,"
+				+ " assume-unchanged:false][b.txt, mode:100644,"
+ + "" + ""
+				+ " content:content, assume-unchanged:true]",
+				indexState(CONTENT
+				| ASSUME_UNCHANGED));
+	}
+
 	private DirCacheEntry addEntryToBuilder(String path, File file,
 			ObjectInserter newObjectInserter, DirCacheBuilder builder, int stage)
 			throws IOException {
@@ -473,4 +505,14 @@ public class AddCommandTest extends RepositoryTestCase {
 		return entry;
 	}
 
+	private void assumeUnchanged(String path) throws IOException {
+		final DirCache dirc = db.lockDirCache();
+		final DirCacheEntry ent = dirc.getEntry(path);
+		if (ent != null)
+			ent.setAssumeValid(true);
+		dirc.write();
+		if (!dirc.commit())
+			throw new IOException("could not commit");
+	}
+
 }

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RepositoryTestCase.java

@@ -138,6 +138,8 @@ public abstract class RepositoryTestCase extends LocalDiskRepositoryTestCase {
 
 	public static final int CONTENT = 16;
 
+	public static final int ASSUME_UNCHANGED = 32;
+
 	/**
 	 * Represent the state of the index in one String. This representation is
 	 * useful when writing tests which do assertions on the state of the index.
@@ -209,6 +211,9 @@ public abstract class RepositoryTestCase extends LocalDiskRepositoryTestCase {
 						+ new String(db.open(entry.getObjectId(),
 								Constants.OBJ_BLOB).getCachedBytes(), "UTF-8"));
 			}
+			if (0 != (includedOptions & ASSUME_UNCHANGED))
+				sb.append(", assume-unchanged:"
+						+ Boolean.toString(entry.isAssumeValid()));
 			sb.append("]");
 		}
 		return sb.toString();

org.eclipse.jgit/src/org/eclipse/jgit/api/AddCommand.java

@@ -163,9 +163,12 @@ public class AddCommand extends GitCommand<DirCache> {
 				// new DirCacheEntry per path.
 				else if (!(path.equals(lastAddedFile))) {
 					if (!(update && tw.getTree(0, DirCacheIterator.class) == null)) {
+						c = tw.getTree(0, DirCacheIterator.class);
 						if (f != null) { // the file exists
 							long sz = f.getEntryLength();
 							DirCacheEntry entry = new DirCacheEntry(path);
+							if (c == null || c.getDirCacheEntry() == null
+									|| !c.getDirCacheEntry().isAssumeValid()) {
 								entry.setLength(sz);
 								entry.setLastModified(f.getEntryLastModified());
 								entry.setFileMode(f.getEntryFileMode());
@@ -180,8 +183,11 @@ public class AddCommand extends GitCommand<DirCache> {
 
 								builder.add(entry);
 								lastAddedFile = path;
+							} else {
+								builder.add(c.getDirCacheEntry());
+							}
+
 						} else if (!update){
-							c = tw.getTree(0, DirCacheIterator.class);
 							builder.add(c.getDirCacheEntry());
 						}
 					}