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[PATCH v2 6/7] fetch: merge fetching and consuming refs

From
Patrick Steinhardt <ps@pks.im>
Date
Aug 24, 2021, 10:37 UTC
Message-ID
<31d9f72edf5c178b2e80c30bb7c0a9bc164ca5eb.1629800774.git.ps@pks.im>
In-Reply-To
<cover.1629800774.git.ps@pks.im>

The functions `fetch_refs()` and `consume_refs()` must always be called together such that we first obtain all missing objects and then update our local refs to match the remote refs. In a subsequent patch, we'll further require that `fetch_refs()` must always be called before `consume_refs()` such that it can correctly assert that we have all objects after the fetch given that we're about to move the connectivity check.

Make this requirement explicit by merging both functions into a single `fetch_and_consume_refs()` function.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 builtin/fetch.c | 32 +++++++++++---------------------
 1 file changed, 11 insertions(+), 21 deletions(-)
diff --git a/builtin/fetch.c b/builtin/fetch.c
index da0e283288..a1e17edd8b 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -1291,8 +1291,9 @@ static int check_exist_and_connected(struct ref *ref_map)
 	return check_connected(iterate_ref_map, &rm, &opt);
 }
 
-static int fetch_refs(struct transport *transport, struct ref *ref_map)
+static int fetch_and_consume_refs(struct transport *transport, struct ref *ref_map)
 {
+	int connectivity_checked;
 	int ret;
 
 	/*
@@ -1304,32 +1305,22 @@ static int fetch_refs(struct transport *transport, struct ref *ref_map)
 		trace2_region_enter("fetch", "fetch_refs", the_repository);
 		ret = transport_fetch_refs(transport, ref_map);
 		trace2_region_leave("fetch", "fetch_refs", the_repository);
-		if (ret) {
-			transport_unlock_pack(transport);
-			return ret;
-		}
+		if (ret)
+			goto out;
 	}
 
-	/*
-	 * Keep the new pack's ".keep" file around to allow the caller
-	 * time to update refs to reference the new objects.
-	 */
-	return 0;
-}
-
-/* Update local refs based on the ref values fetched from a remote */
-static int consume_refs(struct transport *transport, struct ref *ref_map)
-{
-	int connectivity_checked = transport->smart_options
+	connectivity_checked = transport->smart_options
 		? transport->smart_options->connectivity_checked : 0;
-	int ret;
+
 	trace2_region_enter("fetch", "consume_refs", the_repository);
 	ret = store_updated_refs(transport->url,
 				 transport->remote->name,
 				 connectivity_checked,
 				 ref_map);
-	transport_unlock_pack(transport);
 	trace2_region_leave("fetch", "consume_refs", the_repository);
+
+out:
+	transport_unlock_pack(transport);
 	return ret;
 }
 
@@ -1518,8 +1509,7 @@ static void backfill_tags(struct transport *transport, struct ref *ref_map)
 	transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 	transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 	transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
-	if (!fetch_refs(transport, ref_map))
-		consume_refs(transport, ref_map);
+	fetch_and_consume_refs(transport, ref_map);
 
 	if (gsecondary) {
 		transport_disconnect(gsecondary);
@@ -1610,7 +1600,7 @@ static int do_fetch(struct transport *transport,
 				   transport->url);
 		}
 	}
-	if (fetch_refs(transport, ref_map) || consume_refs(transport, ref_map)) {
+	if (fetch_and_consume_refs(transport, ref_map)) {
 		free_refs(ref_map);
 		retcode = 1;
 		goto cleanup;
-- 
2.33.0
Previous: Patrick SteinhardtNext: Derrick Stolee
Message 33 of 48 in “Speed up mirror-fetches with many refs”
  1. 0/6 Speed up mirror-fetches with many refsPatrick Steinhardt, Aug 20, 2021
  2. 1/6 fetch: speed up lookup of want refs via commit-graphPatrick Steinhardt, Aug 20, 2021
  3. Derrick StoleeAug 20, 2021
  4. Junio C HamanoAug 20, 2021
  5. Patrick SteinhardtAug 23, 2021
  6. Derrick StoleeAug 25, 2021
  7. 2/6 fetch: avoid unpacking headers in object existence checkPatrick Steinhardt, Aug 20, 2021
  8. Ævar Arnfjörð BjarmasonAug 25, 2021
  9. 3/6 connected: refactor iterator to return next object ID directlyPatrick Steinhardt, Aug 20, 2021
  10. Derrick StoleeAug 20, 2021
  11. Junio C HamanoAug 20, 2021
  12. René ScharfeAug 20, 2021
  13. Patrick SteinhardtAug 23, 2021
  14. 4/6 fetch-pack: optimize loading of refs via commit graphPatrick Steinhardt, Aug 20, 2021
  15. Derrick StoleeAug 20, 2021
  16. 5/6 fetch: refactor fetch refs to be more extendablePatrick Steinhardt, Aug 20, 2021
  17. Derrick StoleeAug 20, 2021
  18. 6/6 fetch: avoid second connectivity check if we already have all objectsPatrick Steinhardt, Aug 20, 2021
  19. Derrick StoleeAug 20, 2021
  20. Patrick SteinhardtAug 23, 2021
  21. Derrick StoleeAug 20, 2021
  22. Junio C HamanoAug 21, 2021
  23. 0/7 Speed up mirror-fetches with many refsPatrick Steinhardt, Aug 24, 2021
  24. 1/7 fetch: speed up lookup of want refs via commit-graphPatrick Steinhardt, Aug 24, 2021
  25. Derrick StoleeAug 25, 2021
  26. 2/7 fetch: avoid unpacking headers in object existence checkPatrick Steinhardt, Aug 24, 2021
  27. 3/7 connected: refactor iterator to return next object ID directlyPatrick Steinhardt, Aug 24, 2021
  28. 4/7 fetch-pack: optimize loading of refs via commit graphPatrick Steinhardt, Aug 24, 2021
  29. 5/7 fetch: refactor fetch refs to be more extendablePatrick Steinhardt, Aug 24, 2021
  30. Derrick StoleeAug 25, 2021
  31. Patrick SteinhardtSep 1, 2021
  32. 7/7 fetch: avoid second connectivity check if we already have all objectsPatrick Steinhardt, Aug 24, 2021
  33. 6/7 fetch: merge fetching and consuming refsPatrick Steinhardt, Aug 24, 2021
  34. Derrick StoleeAug 25, 2021
  35. Patrick SteinhardtSep 1, 2021
  36. Junio C HamanoAug 24, 2021
  37. Patrick SteinhardtAug 25, 2021
  38. Derrick StoleeAug 25, 2021
  39. 0/7 Speed up mirror-fetches with many refsPatrick Steinhardt, Sep 1, 2021
  40. 1/7 fetch: speed up lookup of want refs via commit-graphPatrick Steinhardt, Sep 1, 2021
  41. 2/7 fetch: avoid unpacking headers in object existence checkPatrick Steinhardt, Sep 1, 2021
  42. 3/7 connected: refactor iterator to return next object ID directlyPatrick Steinhardt, Sep 1, 2021
  43. 4/7 fetch-pack: optimize loading of refs via commit graphPatrick Steinhardt, Sep 1, 2021
  44. 5/7 fetch: refactor fetch refs to be more extendablePatrick Steinhardt, Sep 1, 2021
  45. 6/7 fetch: merge fetching and consuming refsPatrick Steinhardt, Sep 1, 2021
  46. 7/7 fetch: avoid second connectivity check if we already have all objectsPatrick Steinhardt, Sep 1, 2021
  47. Junio C HamanoSep 1, 2021
  48. Junio C HamanoSep 8, 2021

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