Enable calling of smudge filters when checking out paths

When checking out commits/branches JGit was triggering correctly
configured smudge filters. But when checking out paths (either from
index or from commits) JGit was not triggering smudge filters. Fix
CheckoutCommand to properly call filters.

Bug: 486560
Also-by: Pascal Krause <pascal.krausek@sap.com>
Change-Id: I5ff893054defe57ab12e201d901fe74e1376efea
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

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

 		assertEquals("fee\n", read("src/a.txt"));
 	}
 
+	@Test
+	public void testSmudgeFilter_deleteFileAndRestoreFromCommit()
+			throws IOException, GitAPIException {
+		File script = writeTempFile("sed s/o/e/g");
+		StoredConfig config = git.getRepository().getConfig();
+		config.setString("filter", "tstFilter", "smudge",
+				"sh " + slashify(script.getPath()));
+		config.save();
+
+		writeTrashFile("foo", "foo");
+		git.add().addFilepattern("foo").call();
+		git.commit().setMessage("initial").call();
+
+		writeTrashFile(".gitattributes", "*.txt filter=tstFilter");
+		git.add().addFilepattern(".gitattributes").call();
+		git.commit().setMessage("add filter").call();
+
+		writeTrashFile("src/a.tmp", "foo");
+		// Caution: we need a trailing '\n' since sed on mac always appends
+		// linefeeds if missing
+		writeTrashFile("src/a.txt", "foo\n");
+		git.add().addFilepattern("src/a.tmp").addFilepattern("src/a.txt")
+				.call();
+		RevCommit content = git.commit().setMessage("added content").call();
+
+		deleteTrashFile("src/a.txt");
+		git.checkout().setStartPoint(content.getName()).addPath("src/a.txt")
+				.call();
+
+		assertEquals(
+				"[.gitattributes, mode:100644, content:*.txt filter=tstFilter][Test.txt, mode:100644, content:Some change][foo, mode:100644, content:foo][src/a.tmp, mode:100644, content:foo][src/a.txt, mode:100644, content:foo\n]",
+				indexState(CONTENT));
+		assertEquals("foo", read("src/a.tmp"));
+		assertEquals("fee\n", read("src/a.txt"));
+	}
+
+	@Test
+	public void testSmudgeFilter_deleteFileAndRestoreFromIndex()
+			throws IOException, GitAPIException {
+		File script = writeTempFile("sed s/o/e/g");
+		StoredConfig config = git.getRepository().getConfig();
+		config.setString("filter", "tstFilter", "smudge",
+				"sh " + slashify(script.getPath()));
+		config.save();
+
+		writeTrashFile("foo", "foo");
+		git.add().addFilepattern("foo").call();
+		git.commit().setMessage("initial").call();
+
+		writeTrashFile(".gitattributes", "*.txt filter=tstFilter");
+		git.add().addFilepattern(".gitattributes").call();
+		git.commit().setMessage("add filter").call();
+
+		writeTrashFile("src/a.tmp", "foo");
+		// Caution: we need a trailing '\n' since sed on mac always appends
+		// linefeeds if missing
+		writeTrashFile("src/a.txt", "foo\n");
+		git.add().addFilepattern("src/a.tmp").addFilepattern("src/a.txt")
+				.call();
+		git.commit().setMessage("added content").call();
+
+		deleteTrashFile("src/a.txt");
+		git.checkout().addPath("src/a.txt").call();
+
+		assertEquals(
+				"[.gitattributes, mode:100644, content:*.txt filter=tstFilter][Test.txt, mode:100644, content:Some change][foo, mode:100644, content:foo][src/a.tmp, mode:100644, content:foo][src/a.txt, mode:100644, content:foo\n]",
+				indexState(CONTENT));
+		assertEquals("foo", read("src/a.tmp"));
+		assertEquals("fee\n", read("src/a.txt"));
+	}
+
+	@Test
+	public void testSmudgeFilter_deleteFileAndCreateBranchAndRestoreFromCommit()
+			throws IOException, GitAPIException {
+		File script = writeTempFile("sed s/o/e/g");
+		StoredConfig config = git.getRepository().getConfig();
+		config.setString("filter", "tstFilter", "smudge",
+				"sh " + slashify(script.getPath()));
+		config.save();
+
+		writeTrashFile("foo", "foo");
+		git.add().addFilepattern("foo").call();
+		git.commit().setMessage("initial").call();
+
+		writeTrashFile(".gitattributes", "*.txt filter=tstFilter");
+		git.add().addFilepattern(".gitattributes").call();
+		git.commit().setMessage("add filter").call();
+
+		writeTrashFile("src/a.tmp", "foo");
+		// Caution: we need a trailing '\n' since sed on mac always appends
+		// linefeeds if missing
+		writeTrashFile("src/a.txt", "foo\n");
+		git.add().addFilepattern("src/a.tmp").addFilepattern("src/a.txt")
+				.call();
+		RevCommit content = git.commit().setMessage("added content").call();
+
+		deleteTrashFile("src/a.txt");
+		git.checkout().setName("newBranch").setCreateBranch(true)
+				.setStartPoint(content).addPath("src/a.txt").call();
+
+		assertEquals(
+				"[.gitattributes, mode:100644, content:*.txt filter=tstFilter][Test.txt, mode:100644, content:Some change][foo, mode:100644, content:foo][src/a.tmp, mode:100644, content:foo][src/a.txt, mode:100644, content:foo\n]",
+				indexState(CONTENT));
+		assertEquals("foo", read("src/a.tmp"));
+		assertEquals("fee\n", read("src/a.txt"));
+	}
+
 	@Test
 	@Ignore
 	public void testSmudgeAndClean() throws IOException, GitAPIException {

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

 				continue;
 
 			final EolStreamType eolStreamType = treeWalk.getEolStreamType();
+			final String filterCommand = treeWalk
+					.getFilterCommand(Constants.ATTR_FILTER_TYPE_SMUDGE);
 			editor.add(new PathEdit(path) {
 				public void apply(DirCacheEntry ent) {
 					int stage = ent.getStage();
 						if (checkoutStage != null) {
 							if (stage == checkoutStage.number)
 								checkoutPath(ent, r, new CheckoutMetadata(
-										eolStreamType, null));
+										eolStreamType, filterCommand));
 						} else {
 							UnmergedPathException e = new UnmergedPathException(
 									ent);
 							throw new JGitInternalException(e.getMessage(), e);
 						}
 					} else {
-						checkoutPath(ent, r,
-								new CheckoutMetadata(eolStreamType, null));
+						checkoutPath(ent, r, new CheckoutMetadata(eolStreamType,
+								filterCommand));
 					}
 				}
 			});
 			final ObjectId blobId = treeWalk.getObjectId(0);
 			final FileMode mode = treeWalk.getFileMode(0);
 			final EolStreamType eolStreamType = treeWalk.getEolStreamType();
+			final String filterCommand = treeWalk
+					.getFilterCommand(Constants.ATTR_FILTER_TYPE_SMUDGE);
 			editor.add(new PathEdit(treeWalk.getPathString()) {
 				public void apply(DirCacheEntry ent) {
 					ent.setObjectId(blobId);
 					ent.setFileMode(mode);
 					checkoutPath(ent, r,
-							new CheckoutMetadata(eolStreamType, null));
+							new CheckoutMetadata(eolStreamType, filterCommand));
 				}
 			});
 		}