Re: [PATCH] read-tree: Fix regression with creation of a new index file.

[Stephen Boyd <bebarino@gmail.com>]

Johannes Schindelin wrote:
> diff --git a/builtin-read-tree.c b/builtin-read-tree.c
> index 9c2d634..d649c56 100644
> --- a/builtin-read-tree.c
> +++ b/builtin-read-tree.c
> @@ -113,14 +113,14 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
>  	argc = parse_options(argc, argv, unused_prefix, read_tree_options,
>  			     read_tree_usage, 0);
>  
> -	if (read_cache_unmerged() && (opts.prefix || opts.merge))
> -		die("You need to resolve your current index first");
> -
>  	prefix_set = opts.prefix ? 1 : 0;
>  	if (1 < opts.merge + opts.reset + prefix_set)
>  		die("Which one? -m, --reset, or --prefix?");
>  	stage = opts.merge = (opts.reset || opts.merge || prefix_set);
>  
> +	if (opts.merge && (read_cache_unmerged() && !prefix_set && !opts.reset))
>   

This looks more compact but I think the !prefix_set check is wrong.

Yes, we want to do read_cache_unmerged() if we're doing some sort of
merging operation. But we want to die() when either -m or --prefix is
used. Therefore, die() if we're not doing a --reset. So we might as well
just check that case and nothing else.

The original patch from Alexandre is correct, but if you want to avoid
extra nesting I suppose you could do something like the patch below.

Thanks.

---

diff --git a/builtin-read-tree.c b/builtin-read-tree.c
index 9c2d634..c6d5b49 100644
--- a/builtin-read-tree.c
+++ b/builtin-read-tree.c
@@ -113,14 +113,14 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
        argc = parse_options(argc, argv, unused_prefix, read_tree_options,
                             read_tree_usage, 0);
 
-       if (read_cache_unmerged() && (opts.prefix || opts.merge))
-               die("You need to resolve your current index first");
-
        prefix_set = opts.prefix ? 1 : 0;
        if (1 < opts.merge + opts.reset + prefix_set)
                die("Which one? -m, --reset, or --prefix?");
        stage = opts.merge = (opts.reset || opts.merge || prefix_set);
 
+       if (opts.merge && read_cache_unmerged() && !opts.reset)
+               die("You need to resolve your current index first");