[PATCH 02/11] merge-ort: add a special minimal index just for renormalization

["Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Elijah Newren <newren@gmail.com>

renormalize_buffer() requires an index_state, which is something that
merge-ort does not operate with.  However, all the renormalization code
needs is an index with a .gitattributes file...plus a little bit of
setup.  Create such an index, along with the deallocation and
attr_direction handling.

A subsequent commit will add a function to finish the initialization
of this index.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-ort.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/merge-ort.c b/merge-ort.c
index 5309488fd9d8..d91b66a052b6 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -18,6 +18,7 @@
 #include "merge-ort.h"
 
 #include "alloc.h"
+#include "attr.h"
 #include "blob.h"
 #include "cache-tree.h"
 #include "commit.h"
@@ -170,6 +171,16 @@ struct merge_options_internal {
 	 */
 	struct rename_info renames;
 
+	/*
+	 * attr_index: hacky minimal index used for renormalization
+	 *
+	 * renormalization code _requires_ an index, though it only needs to
+	 * find a .gitattributes file within the index.  So, when
+	 * renormalization is important, we create a special index with just
+	 * that one file.
+	 */
+	struct index_state attr_index;
+
 	/*
 	 * current_dir_name, toplevel_dir: temporary vars
 	 *
@@ -349,6 +360,9 @@ static void clear_or_reinit_internal_opts(struct merge_options_internal *opti,
 	string_list_clear(&opti->paths_to_free, 0);
 	opti->paths_to_free.strdup_strings = 0;
 
+	if (opti->attr_index.cache_nr)
+		discard_index(&opti->attr_index);
+
 	/* Free memory used by various renames maps */
 	for (i = MERGE_SIDE1; i <= MERGE_SIDE2; ++i) {
 		struct hashmap_iter iter;
@@ -3272,6 +3286,8 @@ void merge_finalize(struct merge_options *opt,
 {
 	struct merge_options_internal *opti = result->priv;
 
+	if (opt->renormalize)
+		git_attr_set_direction(GIT_ATTR_CHECKIN);
 	assert(opt->priv == NULL);
 
 	clear_or_reinit_internal_opts(opti, 0);
@@ -3347,6 +3363,10 @@ static void merge_start(struct merge_options *opt, struct merge_result *result)
 	/* Default to histogram diff.  Actually, just hardcode it...for now. */
 	opt->xdl_opts = DIFF_WITH_ALG(opt, HISTOGRAM_DIFF);
 
+	/* Handle attr direction stuff for renormalization */
+	if (opt->renormalize)
+		git_attr_set_direction(GIT_ATTR_CHECKOUT);
+
 	/* Initialization of opt->priv, our internal merge data */
 	trace2_region_enter("merge", "allocate/init", opt->repo);
 	if (opt->priv) {
-- 
gitgitgadget