Add commit id and parent count to exception message

Bug: 357312
Change-Id: I2f85cf88650594eca7df6aa0e26bea329674f08e

org.eclipse.jgit/resources/org/eclipse/jgit/JGitText.properties

@@ -76,7 +76,7 @@ cannotResolveLocalTrackingRefForUpdating=Cannot resolve local tracking ref {0} f
 cannotStoreObjects=cannot store objects
 cannotUnloadAModifiedTree=Cannot unload a modified tree.
 cannotWorkWithOtherStagesThanZeroRightNow=Cannot work with other stages than zero right now. Won't write corrupt index.
-canOnlyCherryPickCommitsWithOneParent=Can only cherry-pick commits which have exactly one parent
+canOnlyCherryPickCommitsWithOneParent=Cannot cherry-pick commit ''{0}'' because it has {1} parents, only commits with exactly one parent are supported.
 canOnlyRevertCommitsWithOneParent=Can only revert commits which have exactly one parent
 cantFindObjectInReversePackIndexForTheSpecifiedOffset=Can't find object in (reverse) pack index for the specified offset {0}
 cantPassMeATree=Can't pass me a tree!

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

@@ -122,10 +122,13 @@ public class CherryPickCommand extends GitCommand<CherryPickResult> {
 				RevCommit srcCommit = revWalk.parseCommit(srcObjectId);
 
 				// get the parent of the commit to cherry-pick
-				if (srcCommit.getParentCount() != 1) {
+				if (srcCommit.getParentCount() != 1)
 					throw new MultipleParentsNotAllowedException(
-							JGitText.get().canOnlyCherryPickCommitsWithOneParent);
-				}
+							MessageFormat.format(
+									JGitText.get().canOnlyCherryPickCommitsWithOneParent,
+									srcCommit.name(),
+									Integer.valueOf(srcCommit.getParentCount())));
+
 				RevCommit srcParent = srcCommit.getParent(0);
 				revWalk.parseHeaders(srcParent);
 

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

@@ -554,7 +554,10 @@ public class RebaseCommand extends GitCommand<RebaseResult> {
 		for (RevCommit commit : commitsToUse) {
 			if (commit.getParentCount() != 1)
 				throw new JGitInternalException(
-						JGitText.get().canOnlyCherryPickCommitsWithOneParent);
+						MessageFormat.format(
+								JGitText.get().canOnlyCherryPickCommitsWithOneParent,
+								commit.name(),
+								Integer.valueOf(commit.getParentCount())));
 			cherryPickList.add(commit);
 		}