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[PATCH 4/8] packfile: always populate pack-specific info when reading object info

From
Patrick Steinhardt <ps@pks.im>
Date
Dec 18, 2025, 06:28 UTC
Message-ID
<20251218-b4-pks-odb-read-object-info-improvements-v1-4-81c8368492be@pks.im>
In-Reply-To
<20251218-b4-pks-odb-read-object-info-improvements-v1-0-81c8368492be@pks.im>

When reading object information from a packfile we are not always populating the pack-specific information. This happens in two cases:

  - When calling `packed_object_info()` directly instead of
    `packfile_store_read_object_info()`.
  - When we've got the empty request.

Fix both of these issues so that we can always assume the pack info to be populated when reading object info from a pack.

Note that we don't really care about the second case right now, as the condition will always evaluate to false anyway. This will be fixed in the next commit.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 packfile.c | 38 ++++++++++++++++++++------------------
 1 file changed, 20 insertions(+), 18 deletions(-)
diff --git a/packfile.c b/packfile.c
index 9bce52f912..6e66c90c46 100644
--- a/packfile.c
+++ b/packfile.c
@@ -1657,6 +1657,20 @@ int packed_object_info(struct repository *r, struct packed_git *p,
 	}
 
 	oi->whence = OI_PACKED;
+	oi->u.packed.offset = obj_offset;
+	oi->u.packed.pack = p;
+
+	switch (type) {
+	case OBJ_REF_DELTA:
+		oi->u.packed.type = PACKED_OBJECT_TYPE_REF_DELTA;
+		break;
+	case OBJ_OFS_DELTA:
+		oi->u.packed.type = PACKED_OBJECT_TYPE_OFS_DELTA;
+		break;
+	default:
+		oi->u.packed.type = PACKED_OBJECT_TYPE_FULL;
+		break;
+	}
 
 out:
 	unuse_pack(&w_curs);
@@ -2148,8 +2162,13 @@ int packfile_store_read_object_info(struct packfile_store *store,
 	 * We know that the caller doesn't actually need the
 	 * information below, so return early.
 	 */
-	if (oi == &blank_oi)
+	if (oi == &blank_oi) {
+		oi->whence = OI_PACKED;
+		oi->u.packed.offset = e.offset;
+		oi->u.packed.pack = e.p;
+		oi->u.packed.type = PACKED_OBJECT_TYPE_UNKNOWN;
 		return 0;
+	}
 
 	rtype = packed_object_info(store->odb->repo, e.p, e.offset, oi);
 	if (rtype < 0) {
@@ -2157,23 +2176,6 @@ int packfile_store_read_object_info(struct packfile_store *store,
 		return -1;
 	}
 
-	if (oi->whence == OI_PACKED) {
-		oi->u.packed.offset = e.offset;
-		oi->u.packed.pack = e.p;
-
-		switch (rtype) {
-		case OBJ_REF_DELTA:
-			oi->u.packed.type = PACKED_OBJECT_TYPE_REF_DELTA;
-			break;
-		case OBJ_OFS_DELTA:
-			oi->u.packed.type = PACKED_OBJECT_TYPE_OFS_DELTA;
-			break;
-		default:
-			oi->u.packed.type = PACKED_OBJECT_TYPE_FULL;
-			break;
-		}
-	}
-
 	return 0;
 }
 
-- 
2.52.0.351.gbe84eed79e.dirty
Previous: Patrick SteinhardtNext: Junio C Hamano
Message 7 of 58 in “Improvements for reading object info”
  1. 0/8 Improvements for reading object infoPatrick Steinhardt, Dec 18, 2025
  2. 1/8 object-file: always set OI_LOOSE when reading object infoPatrick Steinhardt, Dec 18, 2025
  3. 2/8 packfile: always declare object info to be OI_PACKEDPatrick Steinhardt, Dec 18, 2025
  4. Junio C HamanoDec 18, 2025
  5. Patrick SteinhardtDec 18, 2025
  6. 3/8 packfile: extend `is_delta` field to allow for "unknown" statePatrick Steinhardt, Dec 18, 2025
  7. 4/8 packfile: always populate pack-specific info when reading object infoPatrick Steinhardt, Dec 18, 2025
  8. Junio C HamanoDec 18, 2025
  9. 5/8 packfile: disentangle return value of `packed_object_info()`Patrick Steinhardt, Dec 18, 2025
  10. 6/8 packfile: skip unpacking object header for disk size requestsPatrick Steinhardt, Dec 18, 2025
  11. 7/8 packfile: fix short-circuiting of empty requestsPatrick Steinhardt, Dec 18, 2025
  12. 8/8 packfile: drop repository parameter from `packed_object_info()`Patrick Steinhardt, Dec 18, 2025
  13. Junio C HamanoDec 18, 2025
  14. Patrick SteinhardtDec 18, 2025
  15. 0/7 Improvements for reading object infoPatrick Steinhardt, Dec 18, 2025
  16. 1/7 object-file: always set OI_LOOSE when reading object infoPatrick Steinhardt, Dec 18, 2025
  17. 2/7 packfile: always declare object info to be OI_PACKEDPatrick Steinhardt, Dec 18, 2025
  18. Toon ClaesJan 5, 2026
  19. 3/7 packfile: extend `is_delta` field to allow for "unknown" statePatrick Steinhardt, Dec 18, 2025
  20. Toon ClaesJan 5, 2026
  21. Patrick SteinhardtJan 6, 2026
  22. 4/7 packfile: always populate pack-specific info when reading object infoPatrick Steinhardt, Dec 18, 2025
  23. Kristoffer HaugsbakkDec 30, 2025
  24. Patrick SteinhardtJan 5, 2026
  25. 5/7 packfile: disentangle return value of `packed_object_info()`Patrick Steinhardt, Dec 18, 2025
  26. 6/7 packfile: skip unpacking object header for disk size requestsPatrick Steinhardt, Dec 18, 2025
  27. 7/7 packfile: drop repository parameter from `packed_object_info()`Patrick Steinhardt, Dec 18, 2025
  28. 0/7 Improvements for reading object infoPatrick Steinhardt, Jan 6, 2026
  29. 1/7 object-file: always set OI_LOOSE when reading object infoPatrick Steinhardt, Jan 6, 2026
  30. Karthik NayakJan 7, 2026
  31. Patrick SteinhardtJan 7, 2026
  32. 2/7 packfile: always declare object info to be OI_PACKEDPatrick Steinhardt, Jan 6, 2026
  33. 3/7 packfile: extend `is_delta` field to allow for "unknown" statePatrick Steinhardt, Jan 6, 2026
  34. Karthik NayakJan 7, 2026
  35. 4/7 packfile: always populate pack-specific info when reading object infoPatrick Steinhardt, Jan 6, 2026
  36. 5/7 packfile: disentangle return value of `packed_object_info()`Patrick Steinhardt, Jan 6, 2026
  37. 6/7 packfile: skip unpacking object header for disk size requestsPatrick Steinhardt, Jan 6, 2026
  38. 7/7 packfile: drop repository parameter from `packed_object_info()`Patrick Steinhardt, Jan 6, 2026
  39. Karthik NayakJan 7, 2026
  40. 0/7 Improvements for reading object infoPatrick Steinhardt, Jan 7, 2026
  41. 1/7 object-file: always set OI_LOOSE when reading object infoPatrick Steinhardt, Jan 7, 2026
  42. Karthik NayakJan 8, 2026
  43. 2/7 packfile: always declare object info to be OI_PACKEDPatrick Steinhardt, Jan 7, 2026
  44. 3/7 packfile: extend `is_delta` field to allow for "unknown" statePatrick Steinhardt, Jan 7, 2026
  45. 4/7 packfile: always populate pack-specific info when reading object infoPatrick Steinhardt, Jan 7, 2026
  46. 5/7 packfile: disentangle return value of `packed_object_info()`Patrick Steinhardt, Jan 7, 2026
  47. 6/7 packfile: skip unpacking object header for disk size requestsPatrick Steinhardt, Jan 7, 2026
  48. 7/7 packfile: drop repository parameter from `packed_object_info()`Patrick Steinhardt, Jan 7, 2026
  49. Karthik NayakJan 8, 2026
  50. 0/7 Improvements for reading object infoPatrick Steinhardt, Jan 12, 2026
  51. 1/7 object-file: always set OI_LOOSE when reading object infoPatrick Steinhardt, Jan 12, 2026
  52. 2/7 packfile: always declare object info to be OI_PACKEDPatrick Steinhardt, Jan 12, 2026
  53. Junio C HamanoJan 12, 2026
  54. 3/7 packfile: extend `is_delta` field to allow for "unknown" statePatrick Steinhardt, Jan 12, 2026
  55. 4/7 packfile: always populate pack-specific info when reading object infoPatrick Steinhardt, Jan 12, 2026
  56. 5/7 packfile: disentangle return value of `packed_object_info()`Patrick Steinhardt, Jan 12, 2026
  57. 6/7 packfile: skip unpacking object header for disk size requestsPatrick Steinhardt, Jan 12, 2026
  58. 7/7 packfile: drop repository parameter from `packed_object_info()`Patrick Steinhardt, Jan 12, 2026

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