Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 read-cache.c   |  2 +-
 resolve-undo.c | 36 +++++++++++++++++++++++++++++++++++-
 resolve-undo.h |  4 +++-
 3 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index eec030b3bb..3b5c63f53a 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1701,7 +1701,7 @@ static int read_index_extension(struct index_state 
*istate,
                istate->cache_tree = cache_tree_read(data, sz);
                break;
        case CACHE_EXT_RESOLVE_UNDO:
-               istate->resolve_undo = resolve_undo_read(data, sz);
+               istate->resolve_undo = resolve_undo_read(data, sz, istate->jw);
                break;
        case CACHE_EXT_LINK:
                if (read_link_extension(istate, data, sz))
diff --git a/resolve-undo.c b/resolve-undo.c
index 236320f179..999020bc40 100644
--- a/resolve-undo.c
+++ b/resolve-undo.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "dir.h"
+#include "json-writer.h"
 #include "resolve-undo.h"
 #include "string-list.h"
 
@@ -49,7 +50,8 @@ void resolve_undo_write(struct strbuf *sb, struct string_list 
*resolve_undo)
        }
 }
 
-struct string_list *resolve_undo_read(const char *data, unsigned long size)
+struct string_list *resolve_undo_read(const char *data, unsigned long size,
+                                     struct json_writer *jw)
 {
        struct string_list *resolve_undo;
        size_t len;
@@ -59,6 +61,11 @@ struct string_list *resolve_undo_read(const char *data, 
unsigned long size)
 
        resolve_undo = xcalloc(1, sizeof(*resolve_undo));
        resolve_undo->strdup_strings = 1;
+       if (jw) {
+               jw_object_inline_begin_object(jw, "resolve-undo");
+               jw_object_intmax(jw, "ext-size", size);
+               jw_object_inline_begin_array(jw, "entries");
+       }
 
        while (size) {
                struct string_list_item *lost;
@@ -94,6 +101,33 @@ struct string_list *resolve_undo_read(const char *data, 
unsigned long size)
                        size -= rawsz;
                        data += rawsz;
                }
+
+               if (jw) {
+                       struct strbuf sb = STRBUF_INIT;
+
+                       jw_array_inline_begin_object(jw);
+                       jw_object_string(jw, "path", lost->string);
+
+                       jw_object_inline_begin_array(jw, "mode");
+                       for (i = 0; i < 3; i++) {
+                               strbuf_addf(&sb, "%06o", ui->mode[i]);
+                               jw_array_string(jw, sb.buf);
+                               strbuf_reset(&sb);
+                       }
+                       jw_end(jw);
+
+                       jw_object_inline_begin_array(jw, "oid");
+                       for (i = 0; i < 3; i++)
+                               jw_array_string(jw, oid_to_hex(&ui->oid[i]));
+                       jw_end(jw);
+
+                       jw_end(jw);
+                       strbuf_release(&sb);
+               }
+       }
+       if (jw) {
+               jw_end(jw);     /* entries */
+               jw_end(jw);     /* resolve-undo */
        }
        return resolve_undo;
 
diff --git a/resolve-undo.h b/resolve-undo.h
index 2b3f0f901e..46b4e93a7e 100644
--- a/resolve-undo.h
+++ b/resolve-undo.h
@@ -3,6 +3,8 @@
 
 #include "cache.h"
 
+struct json_writer;
+
 struct resolve_undo_info {
        unsigned int mode[3];
        struct object_id oid[3];
@@ -10,7 +12,7 @@ struct resolve_undo_info {
 
 void record_resolve_undo(struct index_state *, struct cache_entry *);
 void resolve_undo_write(struct strbuf *, struct string_list *);
-struct string_list *resolve_undo_read(const char *, unsigned long);
+struct string_list *resolve_undo_read(const char *, unsigned long, struct 
json_writer *);
 void resolve_undo_clear_index(struct index_state *);
 int unmerge_index_entry_at(struct index_state *, int);
 void unmerge_index(struct index_state *, const struct pathspec *);
-- 
2.22.0.rc0.322.g2b0371e29a

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