Allow configuration of receive pack's ObjectChecker through fsck.*

fsck.allowLeadingZeroFileMode may be set true to permit pushing
broken trees with leading '0' in the file mode.

fsck.safeForWindows may be set true to require new trees to have
only file names that are safe on the Windows platform.

fsck.safeForMacOS may be set true to require new trees to have
only file names that do not cause collisions or confusion on the
Mac OS platform.

Change-Id: I1a225c1b3cd13c0d1a0d43fffe79355c501f49b7

org.eclipse.jgit/src/org/eclipse/jgit/transport/BaseReceivePack.java

@@ -255,7 +255,7 @@ public abstract class BaseReceivePack {
 		walk = new RevWalk(db);
 
 		final ReceiveConfig cfg = db.getConfig().get(ReceiveConfig.KEY);
-		objectChecker = cfg.checkReceivedObjects ? new ObjectChecker() : null;
+		objectChecker = cfg.newObjectChecker();
 		allowCreates = cfg.allowCreates;
 		allowDeletes = cfg.allowDeletes;
 		allowNonFastForwards = cfg.allowNonFastForwards;
@@ -274,19 +274,26 @@ public abstract class BaseReceivePack {
 		};
 
 		final boolean checkReceivedObjects;
+		final boolean allowLeadingZeroFileMode;
+		final boolean safeForWindows;
+		final boolean safeForMacOS;
 
 		final boolean allowCreates;
-
 		final boolean allowDeletes;
-
 		final boolean allowNonFastForwards;
-
 		final boolean allowOfsDelta;
 
 		ReceiveConfig(final Config config) {
 			checkReceivedObjects = config.getBoolean(
 					"receive", "fsckobjects", //$NON-NLS-1$ //$NON-NLS-2$
 					config.getBoolean("transfer", "fsckobjects", false)); //$NON-NLS-1$ //$NON-NLS-2$
+			allowLeadingZeroFileMode = checkReceivedObjects
+					&& config.getBoolean("fsck", "allowLeadingZeroFileMode", false); //$NON-NLS-1$ //$NON-NLS-2$
+			safeForWindows = checkReceivedObjects
+					&& config.getBoolean("fsck", "safeForWindows", false); //$NON-NLS-1$ //$NON-NLS-2$
+			safeForMacOS = checkReceivedObjects
+					&& config.getBoolean("fsck", "safeForMacOS", false); //$NON-NLS-1$ //$NON-NLS-2$
+
 			allowCreates = true;
 			allowDeletes = !config.getBoolean("receive", "denydeletes", false); //$NON-NLS-1$ //$NON-NLS-2$
 			allowNonFastForwards = !config.getBoolean("receive", //$NON-NLS-1$
@@ -294,6 +301,15 @@ public abstract class BaseReceivePack {
 			allowOfsDelta = config.getBoolean("repack", "usedeltabaseoffset", //$NON-NLS-1$ //$NON-NLS-2$
 					true);
 		}
+
+		ObjectChecker newObjectChecker() {
+			if (!checkReceivedObjects)
+				return null;
+			return new ObjectChecker()
+				.setAllowLeadingZeroFileMode(allowLeadingZeroFileMode)
+				.setSafeForWindows(safeForWindows)
+				.setSafeForMacOS(safeForMacOS);
+		}
 	}
 
 	/**