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[PATCH v2 16/33] t3210: test for spurious error messages for dangling packed refs

From
Michael Haggerty <mhagger@alum.mit.edu>
Date
Apr 22, 2013, 19:52 UTC
Message-ID
<1366660361-21831-17-git-send-email-mhagger@alum.mit.edu>
In-Reply-To
<1366660361-21831-1-git-send-email-mhagger@alum.mit.edu>

A packed reference can be overridden by a loose reference, in which case the packed reference is obsolete and is never used. The object pointed to by such a reference can be garbage collected. Since d66da478f2, this could lead to the emission of a spurious error message:

    error: refs/heads/master does not point to a valid object!

The error is generated by repack_without_ref() if there is an obsolete dangling packed reference in packed-refs when the packed-refs file has to be rewritten due to the deletion of another packed reference. Add a failing test demonstrating this problem and some passing tests of related scenarios.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 t/t3210-pack-refs.sh | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
diff --git a/t/t3210-pack-refs.sh b/t/t3210-pack-refs.sh
index cd04361..c032d88 100755
--- a/t/t3210-pack-refs.sh
+++ b/t/t3210-pack-refs.sh
@@ -118,4 +118,40 @@ test_expect_success 'pack, prune and repack' '
 	test_cmp all-of-them again
 '
 
+test_expect_success 'explicit pack-refs with dangling packed reference' '
+	git commit --allow-empty -m "soon to be garbage-collected" &&
+	git pack-refs --all &&
+	git reset --hard HEAD^ &&
+	sleep 1 &&
+	git reflog expire --expire=now --all &&
+	git prune --expire=now &&
+	git pack-refs --all 2>result &&
+	test_cmp /dev/null result
+'
+
+test_expect_success 'delete ref with dangling packed version' '
+	git checkout -b lamb &&
+	git commit --allow-empty -m "future garbage" &&
+	git pack-refs --all &&
+	git reset --hard HEAD^ &&
+	git checkout master &&
+	sleep 1 &&
+	git reflog expire --expire=now --all &&
+	git prune --expire=now &&
+	git branch -d lamb 2>result &&
+	test_cmp /dev/null result
+'
+
+test_expect_failure 'delete ref while another dangling packed ref' '
+	git branch lamb &&
+	git commit --allow-empty -m "future garbage" &&
+	git pack-refs --all &&
+	git reset --hard HEAD^ &&
+	sleep 1 &&
+	git reflog expire --expire=now --all &&
+	git prune --expire=now &&
+	git branch -d lamb 2>result &&
+	test_cmp /dev/null result
+'
+
 test_done

-- 
1.8.2.1
Previous: Michael HaggertyNext: Michael Haggerty
Message 17 of 40 in “Various cleanups around reference packing and peeling”
  1. 00/33 Various cleanups around reference packing and peelingMichael Haggerty, Apr 22, 2013
  2. 01/33 refs: document flags constants REF_*Michael Haggerty, Apr 22, 2013
  3. 02/33 refs: document the fields of struct ref_valueMichael Haggerty, Apr 22, 2013
  4. 03/33 refs: document do_for_each_ref() and do_one_ref()Michael Haggerty, Apr 22, 2013
  5. 04/33 refs: document how current_ref is usedMichael Haggerty, Apr 22, 2013
  6. 05/33 refs: define constant PEELED_LINE_LENGTHMichael Haggerty, Apr 22, 2013
  7. 06/33 do_for_each_ref_in_dirs(): remove dead codeMichael Haggerty, Apr 22, 2013
  8. 07/33 get_packed_ref(): return a ref_entryMichael Haggerty, Apr 22, 2013
  9. 08/33 peel_ref(): use function get_packed_ref()Michael Haggerty, Apr 22, 2013
  10. 09/33 repack_without_ref(): use function get_packed_ref()Michael Haggerty, Apr 22, 2013
  11. 10/33 refs: extract a function ref_resolves_to_object()Michael Haggerty, Apr 22, 2013
  12. 11/33 refs: extract function peel_object()Michael Haggerty, Apr 22, 2013
  13. 12/33 peel_object(): give more specific information in return valueMichael Haggerty, Apr 22, 2013
  14. 13/33 peel_ref(): fix return value for non-peelable, not-current referenceMichael Haggerty, Apr 22, 2013
  15. 14/33 refs: extract a function peel_entry()Michael Haggerty, Apr 22, 2013
  16. 15/33 refs: change the internal reference-iteration APIMichael Haggerty, Apr 22, 2013
  17. 16/33 t3210: test for spurious error messages for dangling packed refsMichael Haggerty, Apr 22, 2013
  18. 17/33 repack_without_ref(): silence errors for dangling packed refsMichael Haggerty, Apr 22, 2013
  19. Junio C HamanoApr 22, 2013
  20. 18/33 search_ref_dir(): return an index rather than a pointerMichael Haggerty, Apr 22, 2013
  21. 19/33 refs: change how packed refs are deletedMichael Haggerty, Apr 22, 2013
  22. 20/33 t3211: demonstrate loss of peeled refs if a packed ref is deletedMichael Haggerty, Apr 22, 2013
  23. 21/33 repack_without_ref(): write peeled refs in the rewritten fileMichael Haggerty, Apr 22, 2013
  24. 22/33 refs: extract a function write_packed_entry()Michael Haggerty, Apr 22, 2013
  25. 23/33 pack-refs: rename handle_one_ref() to pack_one_ref()Michael Haggerty, Apr 22, 2013
  26. 24/33 pack-refs: merge code from pack-refs.{c,h} into refs.{c,h}Michael Haggerty, Apr 22, 2013
  27. 25/33 pack_one_ref(): rename "path" parameter to "refname"Michael Haggerty, Apr 22, 2013
  28. 26/33 refs: use same lock_file object for both ref-packing functionsMichael Haggerty, Apr 22, 2013
  29. 27/33 pack_refs(): change to use do_for_each_entry()Michael Haggerty, Apr 22, 2013
  30. 28/33 refs: inline function do_not_prune()Michael Haggerty, Apr 22, 2013
  31. 29/33 pack_one_ref(): use function peel_entry()Michael Haggerty, Apr 22, 2013
  32. 30/33 pack_one_ref(): use write_packed_entry() to do the writingMichael Haggerty, Apr 22, 2013
  33. 31/33 pack_one_ref(): do some cheap tests before a more expensive oneMichael Haggerty, Apr 22, 2013
  34. 32/33 refs: change do_for_each_*() functions to take ref_cache argumentsMichael Haggerty, Apr 22, 2013
  35. 33/33 refs: handle the main ref_cache speciallyMichael Haggerty, Apr 22, 2013
  36. Junio C HamanoApr 22, 2013
  37. fixup! t3210: test for spurious error messages for dangling packed refsMichael Haggerty, Apr 23, 2013
  38. Junio C HamanoApr 23, 2013
  39. Michael HaggertyApr 24, 2013
  40. Michael HaggertyApr 27, 2013

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