Subject: Re: [JGIT PATCH] Create a debugging tool "jgit rebuild-commitgraph"

From: "Shawn O. Pearce" <[email-masked]>
Date: Mon, 16 Mar 2009 07:44:50 -0700

Robin Rosenberg <[email-masked]> wrote:
> 
> I'd hate to put such a dangerous thing in the list of normal tools. If the user
> want to shoot him/her-self in the foot they should get a license first.

How about squashing this in?

diff --git a/org.spearce.jgit.pgm/src/org/spearce/jgit/pgm/RebuildCommitGraph.java b/org.spearce.jgit.pgm/src/org/spearce/jgit/pgm/RebuildCommitGraph.java
index ccee997..cc23438 100644
--- a/org.spearce.jgit.pgm/src/org/spearce/jgit/pgm/RebuildCommitGraph.java
+++ b/org.spearce.jgit.pgm/src/org/spearce/jgit/pgm/RebuildCommitGraph.java
@@ -50,6 +50,7 @@
 import java.util.Map;
 
 import org.kohsuke.args4j.Argument;
+import org.kohsuke.args4j.Option;
 import org.spearce.jgit.errors.MissingObjectException;
 import org.spearce.jgit.errors.ObjectWritingException;
 import org.spearce.jgit.lib.Commit;
@@ -85,6 +86,11 @@
  * <p>
  */
 class RebuildCommitGraph extends TextBuiltin {
+	private final String REALLY = "--destroy-this-repository";
+
+	@Option(name = REALLY, usage = "approve destruction of repository")
+	boolean really;
+
 	@Argument(index = 0, required = true, metaVar = "REFS", usage = "for-each-ref output")
 	File refList;
 
@@ -97,6 +103,30 @@
 
 	@Override
 	protected void run() throws Exception {
+		if (!really && !db.getAllRefs().isEmpty()) {
+			final StringBuilder m = new StringBuilder();
+			m.append("fatal: ");
+			m.append("This program will destroy the repository:");
+			m.append("\n");
+			m.append("fatal:\n");
+			m.append("fatal:    ");
+			m.append(db.getDirectory().getAbsolutePath());
+			m.append("\n");
+			m.append("fatal:\n");
+			m.append("fatal: ");
+			m.append("To continue, add ");
+			m.append(REALLY);
+			m.append(" to the command line");
+			m.append("\n");
+			m.append("fatal:");
+			System.err.println(m);
+			throw die("Need approval to destroy current repository");
+		}
+		if (!refList.isFile())
+			throw die("no such file: " + refList.getPath());
+		if (!graph.isFile())
+			throw die("no such file: " + graph.getPath());
+
 		recreateCommitGraph();
 		detachHead();
 		deleteAllRefs();
-- 
Shawn.