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[PATCH] clone --dissociate: avoid locking pack files

From
Johannes Schindelin <johannes.schindelin@gmx.de>
Date
Sep 28, 2015, 19:44 UTC
Message-ID
<682991036f1e8e974ed8ecd7d20dbcc6fb86c344.1443469464.git.johannes.schindelin@gmx.de>

When `git clone` is asked to dissociate the repository from the reference repository whose objects were used, it is quite possible that the pack files need to be repacked. In that case, the pack files need to be deleted that were originally hard-links to the reference repository's pack files.

On platforms where a file cannot be deleted if another process still holds a handle on it, we therefore need to take pains to release all pack files and indexes before dissociating.

This fixes https://github.com/git-for-windows/git/issues/446
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 builtin/clone.c            |  9 ++++++++-
 t/t5700-clone-reference.sh | 21 +++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/builtin/clone.c b/builtin/clone.c
index 578da85..223adc4 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -1064,8 +1064,15 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 	transport_unlock_pack(transport);
 	transport_disconnect(transport);
 
-	if (option_dissociate)
+	if (option_dissociate) {
+		struct packed_git *p;
+
+		for (p = packed_git; p; p = p->next) {
+			close_pack_windows(p);
+			close_pack_index(p);
+		}
 		dissociate_from_references();
+	}
 
 	junk_mode = JUNK_LEAVE_REPO;
 	err = checkout();
diff --git a/t/t5700-clone-reference.sh b/t/t5700-clone-reference.sh
index ef1779f..2250ef4 100755
--- a/t/t5700-clone-reference.sh
+++ b/t/t5700-clone-reference.sh
@@ -188,5 +188,26 @@ test_expect_success 'clone and dissociate from reference' '
 	test_must_fail git -C R fsck &&
 	git -C S fsck
 '
+test_expect_success 'clone, dissociate from partial reference and repack' '
+	rm -fr P Q R &&
+	git init P &&
+	(
+		cd P &&
+		test_commit one &&
+		git repack &&
+		test_commit two &&
+		git repack
+	) &&
+	git clone --bare P Q &&
+	(
+		cd P &&
+		git checkout -b second &&
+		test_commit three &&
+		git repack
+	) &&
+	git clone --bare --dissociate --reference=P Q R &&
+	ls R/objects/pack/*.pack >packs.txt &&
+	test_line_count = 1 packs.txt
+'
 
 test_done
-- 
2.5.3.windows.1.3.gc322723
Next: Max Kirillov
Message 1 of 23 in “clone --dissociate: avoid locking pack files”
  1. clone --dissociate: avoid locking pack filesJohannes Schindelin, Sep 28, 2015
  2. Max KirillovSep 30, 2015
  3. Junio C HamanoSep 30, 2015
  4. Max KirillovOct 1, 2015
  5. Johannes SchindelinOct 5, 2015
  6. 0/4 Fix locking issues on Windows with `git clone --dissociate`Johannes Schindelin, Oct 5, 2015
  7. 1/4 Demonstrate a Windows file locking issue with `git clone --dissociate`Johannes Schindelin, Oct 5, 2015
  8. 2/4 Consolidate code to close a pack's file descriptorJohannes Schindelin, Oct 5, 2015
  9. Junio C HamanoOct 5, 2015
  10. Johannes SchindelinOct 5, 2015
  11. Junio C HamanoOct 5, 2015
  12. Johannes SchindelinOct 6, 2015
  13. 3/4 Add a function to release all packsJohannes Schindelin, Oct 5, 2015
  14. 4/4 clone --dissociate: avoid locking pack filesJohannes Schindelin, Oct 5, 2015
  15. Junio C HamanoOct 5, 2015
  16. 0/4 Fix locking issues on Windows with `git clone --dissociate`Johannes Schindelin, Oct 6, 2015
  17. 1/4 Demonstrate a Windows file locking issue with `git clone --dissociate`Johannes Schindelin, Oct 6, 2015
  18. 2/4 Consolidate code to close a pack's file descriptorJohannes Schindelin, Oct 6, 2015
  19. 3/4 Add a function to release all packsJohannes Schindelin, Oct 6, 2015
  20. Junio C HamanoOct 7, 2015
  21. Johannes SchindelinOct 8, 2015
  22. 4/4 clone --dissociate: avoid locking pack filesJohannes Schindelin, Oct 6, 2015
  23. Max KirillovOct 11, 2015

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