On Wed, 14 May 2008, Junio C Hamano wrote:

quoted text
> This makes me wonder if you are better off not using mergetool in such a
> situation.  Instead, perhaps
> 
> 	$ git ls-files -u --no-stage | xargs git checkout MERGE_HEAD
> 
> might be a better option?  The attached is a completely untested
> weather-baloon patch.
> 
> If this turns out to be a better approach, perhaps we would further want
> to tweak things to make:
> 
> 	$ git checkout --unmerged MERGE_HEAD [--] [<pathspec>...]
> 
> to work (if you want "local", you would use "HEAD" instead of
> "MERGE_HEAD").

This is "for all (or some, by pathspecs) files currently unmerged in the 
index, resolve them to the version in MERGE_HEAD", right?

quoted text
> I would have done so here if "git checkout" were still a scripted version,
> but now it is in C, it would take significantly more effort than it is
> worth just to raise a weatherbaloon.

Like this (also untested)? (This is missing defaulting to a pathspec of 
'.' if --unmerged is used without any pathspecs)

diff --git a/builtin-checkout.c b/builtin-checkout.c
index 10ec137..0bae1d4 100644
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -42,6 +42,8 @@ static int post_checkout_hook(struct commit *old, struct commit *new,
 	return run_command(&proc);
 }
 
+static int unmerged;
+
 static int update_some(const unsigned char *sha1, const char *base, int baselen,
 		       const char *pathname, unsigned mode, int stage)
 {
@@ -59,6 +61,13 @@ static int update_some(const unsigned char *sha1, const char *base, int baselen,
 	hashcpy(ce->sha1, sha1);
 	memcpy(ce->name, base, baselen);
 	memcpy(ce->name + baselen, pathname, len - baselen);
+	if (unmerged) {
+		int pos = cache_name_pos(ce->name, len);
+		if (!(pos && pos < active_nr && ce_same_name(active_cache[pos], active_cache[pos + 1]))) {
+			free(ce);
+			return 0;
+		}
+	}
 	ce->ce_flags = create_ce_flags(len, 0);
 	ce->ce_mode = create_ce_mode(mode);
 	add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
@@ -508,6 +517,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 			BRANCH_TRACK_EXPLICIT),
 		OPT_BOOLEAN('f', NULL, &opts.force, "force"),
 		OPT_BOOLEAN('m', NULL, &opts.merge, "merge"),
+		OPT_BOOLEAN( 0 , "unmerged", &unmerged, "check out unmerged paths"),
 		OPT_END(),
 	};
 
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