From a80df5380f6f94a8fccaaecac673e3ec9c29bb89 Mon Sep 17 00:00:00 2001 From: Alex Spradlin Date: Tue, 13 Aug 2019 15:20:07 -0700 Subject: [PATCH] RevWalk: Traverse all parents of UNINTERESTING commits When firstParent is set, RevWalk traverses only the first parent of a commit, even though that commit is UNINTERESTING. Since we want the maximal UNINTERESTING set, we shouldn't prune any parents here. This issue is apparent only when some of the commits being traversed are unparsed, since walker.carryFlagsImpl() propagates the UNINTERESTING flag to all parsed ancestors, masking the issue. Therefore teach RevWalk to traverse all parents when a commit is UNINTERESTING and not only the first parent. Since this issue is masked by commit parsing, also test situations when the commits involved are unparsed. Signed-off-by: Alex Spradlin Change-Id: I95e2ad9ae8f1f50fbecae674367ee7e0855519b1 --- .../eclipse/jgit/junit/TestRepository.java | 39 +++++++- .../jgit/revwalk/FirstParentRevWalkTest.java | 90 +++++++++++++++++++ .../eclipse/jgit/revwalk/RevWalkTestCase.java | 5 ++ .../jgit/revwalk/PendingGenerator.java | 4 +- 4 files changed, 136 insertions(+), 2 deletions(-) diff --git a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/TestRepository.java b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/TestRepository.java index e89cf0fb8..362007a98 100644 --- a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/TestRepository.java +++ b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/TestRepository.java @@ -360,6 +360,21 @@ public class TestRepository implements AutoCloseable { return null; // never reached. } + /** + * Create a new, unparsed commit. + *

+ * See {@link #unparsedCommit(int, RevTree, ObjectId...)}. The tree is the + * empty tree (no files or subdirectories). + * + * @param parents + * zero or more IDs of the commit's parents. + * @return the ID of the new commit. + * @throws Exception + */ + public ObjectId unparsedCommit(ObjectId... parents) throws Exception { + return unparsedCommit(1, tree(), parents); + } + /** * Create a new commit. *

@@ -428,6 +443,28 @@ public class TestRepository implements AutoCloseable { */ public RevCommit commit(final int secDelta, final RevTree tree, final RevCommit... parents) throws Exception { + ObjectId id = unparsedCommit(secDelta, tree, parents); + return pool.parseCommit(id); + } + + /** + * Create a new, unparsed commit. + *

+ * The author and committer identities are stored using the current + * timestamp, after being incremented by {@code secDelta}. The message body + * is empty. + * + * @param secDelta + * number of seconds to advance {@link #tick(int)} by. + * @param tree + * the root tree for the commit. + * @param parents + * zero or more IDs of the commit's parents. + * @return the ID of the new commit. + * @throws Exception + */ + public ObjectId unparsedCommit(final int secDelta, final RevTree tree, + final ObjectId... parents) throws Exception { tick(secDelta); final org.eclipse.jgit.lib.CommitBuilder c; @@ -443,7 +480,7 @@ public class TestRepository implements AutoCloseable { id = ins.insert(c); ins.flush(); } - return pool.parseCommit(id); + return id; } /** diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/FirstParentRevWalkTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/FirstParentRevWalkTest.java index 474ff7a7c..1fc7a5545 100644 --- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/FirstParentRevWalkTest.java +++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/FirstParentRevWalkTest.java @@ -46,6 +46,7 @@ package org.eclipse.jgit.revwalk; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertNull; +import org.eclipse.jgit.lib.ObjectId; import org.eclipse.jgit.revwalk.filter.MessageRevFilter; import org.eclipse.jgit.revwalk.filter.RevFilter; import org.junit.Test; @@ -267,6 +268,26 @@ public class FirstParentRevWalkTest extends RevWalkTestCase { assertNull(rw.next()); } + @Test + public void testUnparsedFirstParentOfFirstParentMarkedUninteresting() + throws Exception { + ObjectId a = unparsedCommit(); + ObjectId b1 = unparsedCommit(a); + ObjectId b2 = unparsedCommit(a); + ObjectId c1 = unparsedCommit(b1); + ObjectId c2 = unparsedCommit(b2); + ObjectId d = unparsedCommit(c1, c2); + + rw.reset(); + rw.setFirstParent(true); + RevCommit parsedD = rw.parseCommit(d); + markStart(parsedD); + markUninteresting(rw.parseCommit(b1)); + assertCommit(parsedD, rw.next()); + assertCommit(rw.parseCommit(c1), rw.next()); + assertNull(rw.next()); + } + @Test public void testFirstParentMarkedUninteresting() throws Exception { RevCommit a = commit(); @@ -282,6 +303,75 @@ public class FirstParentRevWalkTest extends RevWalkTestCase { assertNull(rw.next()); } + @Test + public void testUnparsedFirstParentMarkedUninteresting() throws Exception { + ObjectId a = unparsedCommit(); + ObjectId b1 = unparsedCommit(a); + ObjectId b2 = unparsedCommit(a); + ObjectId c = unparsedCommit(b1, b2); + + rw.reset(); + rw.setFirstParent(true); + RevCommit parsedC = rw.parseCommit(c); + markStart(parsedC); + markUninteresting(rw.parseCommit(b1)); + assertCommit(parsedC, rw.next()); + assertNull(rw.next()); + } + + @Test + public void testUninterestingCommitWithTwoParents() throws Exception { + RevCommit a = commit(); + RevCommit b = commit(a); + RevCommit c1 = commit(b); + RevCommit c2 = commit(b); + RevCommit d = commit(c1); + RevCommit e = commit(c1, c2); + + RevCommit uA = commit(a, b); + RevCommit uB1 = commit(uA, c2); + RevCommit uB2 = commit(uA, d); + RevCommit uninteresting = commit(uB1, uB2); + + rw.reset(); + rw.setFirstParent(true); + markStart(e); + markUninteresting(uninteresting); + + assertCommit(e, rw.next()); + assertNull(rw.next()); + } + + /** + * This fails if we try to propagate flags before parsing commits. + * + * @throws Exception + */ + @Test + public void testUnparsedUninterestingCommitWithTwoParents() + throws Exception { + ObjectId a = unparsedCommit(); + ObjectId b = unparsedCommit(a); + ObjectId c1 = unparsedCommit(b); + ObjectId c2 = unparsedCommit(b); + ObjectId d = unparsedCommit(c1); + ObjectId e = unparsedCommit(c1, c2); + + ObjectId uA = unparsedCommit(a, b); + ObjectId uB1 = unparsedCommit(uA, c2); + ObjectId uB2 = unparsedCommit(uA, d); + ObjectId uninteresting = unparsedCommit(uB1, uB2); + + rw.reset(); + rw.setFirstParent(true); + RevCommit parsedE = rw.parseCommit(e); + markStart(parsedE); + markUninteresting(rw.parseCommit(uninteresting)); + + assertCommit(parsedE, rw.next()); + assertNull(rw.next()); + } + @Test public void testDepthWalk() throws Exception { RevCommit a = commit(); diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkTestCase.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkTestCase.java index 544398219..a0056ae21 100644 --- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkTestCase.java +++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkTestCase.java @@ -51,6 +51,7 @@ import org.eclipse.jgit.dircache.DirCacheEntry; import org.eclipse.jgit.junit.RepositoryTestCase; import org.eclipse.jgit.junit.TestRepository; import org.eclipse.jgit.junit.TestRepository.CommitBuilder; +import org.eclipse.jgit.lib.ObjectId; import org.eclipse.jgit.lib.Repository; /** Support for tests of the {@link RevWalk} class. */ @@ -96,6 +97,10 @@ public abstract class RevWalkTestCase extends RepositoryTestCase { return util.get(tree, path); } + protected ObjectId unparsedCommit(ObjectId... parents) throws Exception { + return util.unparsedCommit(parents); + } + protected RevCommit commit(RevCommit... parents) throws Exception { return util.commit(parents); } diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/PendingGenerator.java b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/PendingGenerator.java index 52dd56d12..3990dd6d0 100644 --- a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/PendingGenerator.java +++ b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/PendingGenerator.java @@ -143,7 +143,9 @@ class PendingGenerator extends Generator { for (int i = 0; i < c.parents.length; i++) { RevCommit p = c.parents[i]; - if (firstParent && i > 0) { + // If the commit is uninteresting, don't try to prune + // parents because we want the maximal uninteresting set. + if (firstParent && i > 0 && (c.flags & UNINTERESTING) == 0) { continue; } if ((p.flags & SEEN) != 0)