Refactor the prefetching code in unpack-trees.c into its own function,
because it will be used elsewhere in a subsequent commit.

Signed-off-by: Jonathan Tan <redacted>
---
 cache.h        |  9 +++++++++
 read-cache.c   | 23 +++++++++++++++++++++++
 unpack-trees.c | 27 ++++++++-------------------
 3 files changed, 40 insertions(+), 19 deletions(-)

diff --git a/cache.h b/cache.h
index ba04ff8bd3..6f952e22c6 100644
--- a/cache.h
+++ b/cache.h

@@ -410,6 +410,15 @@ struct cache_entry *dup_cache_entry(const struct cache_entry *ce, struct index_s
  */
 void validate_cache_entries(const struct index_state *istate);

+/*
+ * Bulk prefetch all missing cache entries that are not GITLINKs and that match
+ * the given predicate. This function should only be called if
+ * has_promisor_remote() returns true.
+ */
+typedef int (*must_prefetch_predicate)(const struct cache_entry *);
+void prefetch_cache_entries(const struct index_state *istate,
+                           must_prefetch_predicate must_prefetch);
+
 #ifdef USE_THE_INDEX_COMPATIBILITY_MACROS
 extern struct index_state the_index;

diff --git a/read-cache.c b/read-cache.c
index ba2b012a6c..4e396bf17f 100644
--- a/read-cache.c
+++ b/read-cache.c

@@ -27,6 +27,7 @@
 #include "progress.h"
 #include "sparse-index.h"
 #include "csum-file.h"
+#include "promisor-remote.h"

 /* Mask for the name length in ce_flags in the on-disk index */

@@ -3657,3 +3658,25 @@ static void write_ieot_extension(struct strbuf *sb, struct index_entry_offset_ta
                strbuf_add(sb, &buffer, sizeof(uint32_t));
        }
 }
+
+void prefetch_cache_entries(const struct index_state *istate,
+                           must_prefetch_predicate must_prefetch)
+{
+       int i;
+       struct oid_array to_fetch = OID_ARRAY_INIT;
+
+       for (i = 0; i < istate->cache_nr; i++) {
+               struct cache_entry *ce = istate->cache[i];
+
+               if (S_ISGITLINK(ce->ce_mode) || !must_prefetch(ce))
+                       continue;
+               if (!oid_object_info_extended(the_repository, &ce->oid,
+                                             NULL,
+                                             OBJECT_INFO_FOR_PREFETCH))
+                       continue;
+               oid_array_append(&to_fetch, &ce->oid);
+       }
+       promisor_remote_get_direct(the_repository,
+                                  to_fetch.oid, to_fetch.nr);
+       oid_array_clear(&to_fetch);
+}

diff --git a/unpack-trees.c b/unpack-trees.c
index f88a69f8e7..ed92794032 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c

@@ -392,6 +392,11 @@ static void report_collided_checkout(struct index_state *index)
        string_list_clear(&list, 0);
 }

+static int must_checkout(const struct cache_entry *ce)
+{
+       return ce->ce_flags & CE_UPDATE;
+}
+
 static int check_updates(struct unpack_trees_options *o,
                         struct index_state *index)
 {

@@ -442,28 +447,12 @@ static int check_updates(struct unpack_trees_options *o,
        if (should_update_submodules())
                load_gitmodules_file(index, &state);

-       if (has_promisor_remote()) {
+       if (has_promisor_remote())
                /*
                 * Prefetch the objects that are to be checked out in the loop
                 * below.
                 */
-               struct oid_array to_fetch = OID_ARRAY_INIT;
-               for (i = 0; i < index->cache_nr; i++) {
-                       struct cache_entry *ce = index->cache[i];
-
-                       if (!(ce->ce_flags & CE_UPDATE) ||
-                           S_ISGITLINK(ce->ce_mode))
-                               continue;
-                       if (!oid_object_info_extended(the_repository, &ce->oid,
-                                                     NULL,
-                                                     OBJECT_INFO_FOR_PREFETCH))
-                               continue;
-                       oid_array_append(&to_fetch, &ce->oid);
-               }
-               promisor_remote_get_direct(the_repository,
-                                          to_fetch.oid, to_fetch.nr);
-               oid_array_clear(&to_fetch);
-       }
+               prefetch_cache_entries(index, must_checkout);

        get_parallel_checkout_configs(&pc_workers, &pc_threshold);

@@ -473,7 +462,7 @@ static int check_updates(struct unpack_trees_options *o,
        for (i = 0; i < index->cache_nr; i++) {
                struct cache_entry *ce = index->cache[i];

-               if (ce->ce_flags & CE_UPDATE) {
+               if (must_checkout(ce)) {
                        size_t last_pc_queue_size = pc_queue_size();

                        if (ce->ce_flags & CE_WT_REMOVE)
--

2.32.0.432.gabb21c7263-goog