Support for Submodule configuration submodule.<name>.ignore

For each submodule native git allows to configure which modifications to
submodules should be ignored by the status command. It is possible to
ignore "none", "all", "dirty", "untracked" [1]. This configuration is
now supported by IndexDiff. The StatusCommand offers the possibility to
specify this mode.

[1] http://git-scm.com/docs/gitmodules

Change-Id: Ifd81d574a680f9b4152945ba70f8ec4af4f452c9

4 files changed, 167 insertions, 12 deletions

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/StatusCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/StatusCommand.java
index dee0a31b91..fe2d848e54 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/api/StatusCommand.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/StatusCommand.java
@@ -53,6 +53,7 @@ import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.IndexDiff;
 import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.submodule.SubmoduleWalk.IgnoreSubmoduleMode;
 import org.eclipse.jgit.treewalk.FileTreeIterator;
 import org.eclipse.jgit.treewalk.WorkingTreeIterator;
 import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
@@ -72,6 +73,8 @@ public class StatusCommand extends GitCommand<Status> {
 	private List<String> paths = null;
 	private ProgressMonitor progressMonitor = null;
 
+	private IgnoreSubmoduleMode ignoreSubmoduleMode = null;
+
 	/**
 	 * @param repo
 	 */
@@ -80,6 +83,15 @@ public class StatusCommand extends GitCommand<Status> {
 	}
 
 	/**
+	 * @param mode
+	 * @return {@code this}
+	 */
+	public StatusCommand setIgnoreSubmodules(IgnoreSubmoduleMode mode) {
+		ignoreSubmoduleMode = mode;
+		return this;
+	}
+
+	/**
 	 * Show only the status of files which match the given paths. The path must
 	 * either name a file or a directory exactly. All paths are always relative
 	 * to the repository root. If a directory is specified all files recursively
@@ -127,6 +139,8 @@ public class StatusCommand extends GitCommand<Status> {
 
 		try {
 			IndexDiff diff = new IndexDiff(repo, Constants.HEAD, workingTreeIt);
+			if (ignoreSubmoduleMode != null)
+				diff.setIgnoreSubmoduleMode(ignoreSubmoduleMode);
 			if (paths != null)
 				diff.setFilter(PathFilterGroup.createFromStrings(paths));
 			if (progressMonitor == null)
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
index 61b05c8b48..7361e29ed4 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
@@ -208,6 +208,9 @@ public class ConfigConstants {
 	/** The "update" key */
 	public static final String CONFIG_KEY_UPDATE = "update";
 
+	/** The "update" key */
+	public static final String CONFIG_KEY_IGNORE = "ignore";
+
 	/** The "compression" key */
 	public static final String CONFIG_KEY_COMPRESSION = "compression";
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/IndexDiff.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/IndexDiff.java
index 8eb0333550..684b18af9b 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/IndexDiff.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/IndexDiff.java
@@ -58,13 +58,17 @@ import java.util.Set;
 import org.eclipse.jgit.dircache.DirCache;
 import org.eclipse.jgit.dircache.DirCacheEntry;
 import org.eclipse.jgit.dircache.DirCacheIterator;
+import org.eclipse.jgit.errors.ConfigInvalidException;
 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
 import org.eclipse.jgit.errors.MissingObjectException;
 import org.eclipse.jgit.errors.StopWalkException;
 import org.eclipse.jgit.revwalk.RevTree;
 import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.submodule.SubmoduleWalk;
+import org.eclipse.jgit.submodule.SubmoduleWalk.IgnoreSubmoduleMode;
 import org.eclipse.jgit.treewalk.AbstractTreeIterator;
 import org.eclipse.jgit.treewalk.EmptyTreeIterator;
+import org.eclipse.jgit.treewalk.FileTreeIterator;
 import org.eclipse.jgit.treewalk.TreeWalk;
 import org.eclipse.jgit.treewalk.WorkingTreeIterator;
 import org.eclipse.jgit.treewalk.filter.AndTreeFilter;
@@ -268,6 +272,10 @@ public class IndexDiff {
 
 	private IndexDiffFilter indexDiffFilter;
 
+	private Map<String, IndexDiff> submoduleIndexDiffs = new HashMap<String, IndexDiff>();
+
+	private IgnoreSubmoduleMode ignoreSubmoduleMode = null;
+
 	/**
 	 * Construct an IndexDiff
 	 *
@@ -281,13 +289,7 @@ public class IndexDiff {
 	 */
 	public IndexDiff(Repository repository, String revstr,
 			WorkingTreeIterator workingTreeIterator) throws IOException {
-		this.repository = repository;
-		ObjectId objectId = repository.resolve(revstr);
-		if (objectId != null)
-			tree = new RevWalk(repository).parseTree(objectId);
-		else
-			tree = null;
-		this.initialWorkingTreeIterator = workingTreeIterator;
+		this(repository, repository.resolve(revstr), workingTreeIterator);
 	}
 
 	/**
@@ -311,6 +313,40 @@ public class IndexDiff {
 	}
 
 	/**
+	 * @param mode
+	 *            defines how modifications in submodules are treated
+	 */
+	public void setIgnoreSubmoduleMode(IgnoreSubmoduleMode mode) {
+		this.ignoreSubmoduleMode = mode;
+	}
+
+	/**
+	 * A factory to producing WorkingTreeIterators
+	 */
+	public interface WorkingTreeIteratorFactory {
+		/**
+		 * @param repo
+		 * @return a WorkingTreeIterator for repo
+		 */
+		public WorkingTreeIterator getWorkingTreeIterator(Repository repo);
+	}
+
+	private WorkingTreeIteratorFactory wTreeIt = new WorkingTreeIteratorFactory() {
+		public WorkingTreeIterator getWorkingTreeIterator(Repository repo) {
+			return new FileTreeIterator(repo);
+		}
+	};
+
+	/**
+	 * Allows higher layers to set the factory for WorkingTreeIterators.
+	 *
+	 * @param wTreeIt
+	 */
+	public void setWorkingTreeItFactory(WorkingTreeIteratorFactory wTreeIt) {
+		this.wTreeIt = wTreeIt;
+	}
+
+	/**
 	 * Sets a filter. Can be used e.g. for restricting the tree walk to a set of
 	 * files.
 	 *
@@ -413,18 +449,25 @@ public class IndexDiff {
 							|| treeIterator.getEntryRawMode()
 							!= dirCacheIterator.getEntryRawMode()) {
 						// in repo, in index, content diff => changed
-						changed.add(treeWalk.getPathString());
+						if (!isEntryGitLink(treeIterator)
+								|| !isEntryGitLink(dirCacheIterator)
+								|| ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL)
+							changed.add(treeWalk.getPathString());
 					}
 				} else {
 					// in repo, not in index => removed
-					removed.add(treeWalk.getPathString());
+					if (!isEntryGitLink(treeIterator)
+							|| ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL)
+						removed.add(treeWalk.getPathString());
 					if (workingTreeIterator != null)
 						untracked.add(treeWalk.getPathString());
 				}
 			} else {
 				if (dirCacheIterator != null) {
 					// not in repo, in index => added
-					added.add(treeWalk.getPathString());
+					if (!isEntryGitLink(dirCacheIterator)
+							|| ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL)
+						added.add(treeWalk.getPathString());
 				} else {
 					// not in repo, not in index => untracked
 					if (workingTreeIterator != null
@@ -437,13 +480,59 @@ public class IndexDiff {
 			if (dirCacheIterator != null) {
 				if (workingTreeIterator == null) {
 					// in index, not in workdir => missing
-					missing.add(treeWalk.getPathString());
+					if (!isEntryGitLink(dirCacheIterator)
+							|| ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL)
+						missing.add(treeWalk.getPathString());
 				} else {
 					if (workingTreeIterator.isModified(
 							dirCacheIterator.getDirCacheEntry(), true,
 							treeWalk.getObjectReader())) {
 						// in index, in workdir, content differs => modified
-						modified.add(treeWalk.getPathString());
+						if (!isEntryGitLink(dirCacheIterator) || !isEntryGitLink(workingTreeIterator)
+								|| (ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL && ignoreSubmoduleMode != IgnoreSubmoduleMode.DIRTY))
+							modified.add(treeWalk.getPathString());
+					}
+				}
+			}
+		}
+
+		if (ignoreSubmoduleMode != IgnoreSubmoduleMode.ALL) {
+			IgnoreSubmoduleMode localIgnoreSubmoduleMode = ignoreSubmoduleMode;
+			SubmoduleWalk smw = SubmoduleWalk.forIndex(repository);
+			while (smw.next()) {
+				try {
+					if (localIgnoreSubmoduleMode == null)
+						localIgnoreSubmoduleMode = smw.getModulesIgnore();
+					if (IgnoreSubmoduleMode.ALL
+							.equals(localIgnoreSubmoduleMode))
+						continue;
+				} catch (ConfigInvalidException e) {
+					throw new IOException(
+							"Found invalid ignore param for submodule "
+									+ smw.getPath());
+				}
+				Repository subRepo = smw.getRepository();
+				ObjectId subHead = subRepo.resolve("HEAD");
+				if (subHead != null && !subHead.equals(smw.getObjectId()))
+					modified.add(smw.getPath());
+				else if (ignoreSubmoduleMode != IgnoreSubmoduleMode.DIRTY) {
+					IndexDiff smid = submoduleIndexDiffs.get(smw.getPath());
+					if (smid == null) {
+						smid = new IndexDiff(subRepo, smw.getObjectId(),
+								wTreeIt.getWorkingTreeIterator(subRepo));
+						submoduleIndexDiffs.put(smw.getPath(), smid);
+					}
+					if (smid.diff()) {
+						if (ignoreSubmoduleMode == IgnoreSubmoduleMode.UNTRACKED
+								&& smid.getAdded().isEmpty()
+								&& smid.getChanged().isEmpty()
+								&& smid.getConflicting().isEmpty()
+								&& smid.getMissing().isEmpty()
+								&& smid.getModified().isEmpty()
+								&& smid.getRemoved().isEmpty()) {
+							continue;
+						}
+						modified.add(smw.getPath());
 					}
 				}
 			}
@@ -462,6 +551,11 @@ public class IndexDiff {
 			return true;
 	}
 
+	private boolean isEntryGitLink(AbstractTreeIterator ti) {
+		return ((ti != null) && (ti.getEntryRawMode() == FileMode.GITLINK
+				.getBits()));
+	}
+
 	private void addConflict(String path, int stage) {
 		StageState existingStageStates = conflicts.get(path);
 		byte stageMask = 0;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/submodule/SubmoduleWalk.java b/org.eclipse.jgit/src/org/eclipse/jgit/submodule/SubmoduleWalk.java
index c31ffd1f7d..30eca741f3 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/submodule/SubmoduleWalk.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/submodule/SubmoduleWalk.java
@@ -79,6 +79,31 @@ import org.eclipse.jgit.util.FS;
 public class SubmoduleWalk {
 
 	/**
+	 * The values for the config param submodule.<name>.ignore
+	 */
+	public enum IgnoreSubmoduleMode {
+		/**
+		 * Ignore all modifications to submodules
+		 */
+		ALL,
+
+		/**
+		 * Ignore changes to the working tree of a submodule
+		 */
+		DIRTY,
+
+		/**
+		 * Ignore changes to untracked files in the working tree of a submodule
+		 */
+		UNTRACKED,
+
+		/**
+		 * Ignore nothing. That's the default
+		 */
+		NONE;
+	}
+
+	/**
 	 * Create a generator to walk over the submodule entries currently in the
 	 * index
 	 *
@@ -600,6 +625,25 @@ public class SubmoduleWalk {
 	}
 
 	/**
+	 * Get the configured ignore field for the current entry. This will be the
+	 * value from the .gitmodules file in the current repository's working tree.
+	 *
+	 * @return ignore value
+	 * @throws ConfigInvalidException
+	 * @throws IOException
+	 */
+	public IgnoreSubmoduleMode getModulesIgnore() throws IOException,
+			ConfigInvalidException {
+		lazyLoadModulesConfig();
+		String name = modulesConfig.getString(
+				ConfigConstants.CONFIG_SUBMODULE_SECTION, path,
+				ConfigConstants.CONFIG_KEY_IGNORE);
+		if (name == null)
+			return null;
+		return IgnoreSubmoduleMode.valueOf(name.trim().toUpperCase());
+	}
+
+	/**
 	 * Get repository for current submodule entry
 	 *
 	 * @return repository or null if non-existent