From d0db466326c32ca4b3faa849a81fab7d60615c6f Mon Sep 17 00:00:00 2001
From: Junio C Hamano <junkio@cox.net>
Date: Mon, 18 Apr 2005 15:07:24 -0700
Subject: [PATCH] show-diff.c: check unreadbale blob.

This patch fixes show-diff to detect unreadable blob and warn
instead of going ahead and crashing.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/show-diff.c b/show-diff.c
index 2bd789c..dacdd36 100644
--- a/show-diff.c
+++ b/show-diff.c
@@ -71,6 +71,11 @@ static void show_diff_empty(struct cache_entry *ce)
 	unsigned char type[20], *p, *end;
 
 	old = read_sha1_file(ce->sha1, type, &size);
+	if (! old) {
+		error("unable to read blob object for %s (%s)", ce->name,
+		      sha1_to_hex(ce->sha1));
+		return;
+	}
 	if (size > 0) {
 		int startline = 1;
 		int c = 0;
@@ -195,7 +200,11 @@ int main(int argc, char **argv)
 			continue;
 
 		old = read_sha1_file(ce->sha1, type, &size);
-		show_differences(ce->name, old, size);
+		if (! old)
+			error("unable to read blob object for %s (%s)",
+			      ce->name, sha1_to_hex(ce->sha1));
+		else
+			show_differences(ce->name, old, size);
 		free(old);
 	}
 	return 0;
-- 
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