Merge branch 'jc/index-output'

* jc/index-output:
  git-read-tree --index-output=<file>
  _GIT_INDEX_OUTPUT: allow plumbing to output to an alternative index file.

Conflicts:

	builtin-apply.c

1 files changed, 8 insertions, 3 deletions

diff --git a/builtin-read-tree.c b/builtin-read-tree.c
index 793eae0a5..213bd93c7 100644
--- a/builtin-read-tree.c
+++ b/builtin-read-tree.c
@@ -84,7 +84,7 @@ static void prime_cache_tree(void)
 
 }
 
-static const char read_tree_usage[] = "git-read-tree (<sha> | [[-m [--aggressive] | --reset | --prefix=<prefix>] [-u | -i]] [--exclude-per-directory=<gitignore>] <sha1> [<sha2> [<sha3>]])";
+static const char read_tree_usage[] = "git-read-tree (<sha> | [[-m [--aggressive] | --reset | --prefix=<prefix>] [-u | -i]] [--exclude-per-directory=<gitignore>] [--index-output=<file>] <sha1> [<sha2> [<sha3>]])";
 
 static struct lock_file lock_file;
 
@@ -100,7 +100,7 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
 	setup_git_directory();
 	git_config(git_default_config);
 
-	newfd = hold_lock_file_for_update(&lock_file, get_index_file(), 1);
+	newfd = hold_locked_index(&lock_file, 1);
 
 	git_config(git_default_config);
 
@@ -128,6 +128,11 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
 			continue;
 		}
 
+		if (!prefixcmp(arg, "--index-output=")) {
+			set_alternate_index_output(arg + 15);
+			continue;
+		}
+
 		/* "--prefix=<subdirectory>/" means keep the current index
 		 *  entries and put the entries from the tree under the
 		 * given subdirectory.
@@ -267,7 +272,7 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
 	}
 
 	if (write_cache(newfd, active_cache, active_nr) ||
-	    close(newfd) || commit_lock_file(&lock_file))
+	    close(newfd) || commit_locked_index(&lock_file))
 		die("unable to write new index file");
 	return 0;
 }