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* merge-tree: fix d/f conflictsJunio C Hamano2012-12-261-2/+2
| | | | | | | | | | | | | | | | The previous commit documented two known breakages revolving around a case where one side flips a tree into a blob (or vice versa), where the original code simply gets confused and feeds a mixture of trees and blobs into either the recursive merge-tree (and recursing into the blob will fail) or three-way merge (and merging tree contents together with blobs will fail). Fix it by feeding trees (and only trees) into the recursive merge-tree machinery and blobs (and only blobs) into the three-way content level merge machinery separately; when this happens, the entire merge has to be marked as conflicting at the structure level. Signed-off-by: Junio C Hamano <gitster@pobox.com>
* merge-tree: add comments to clarify what these functions are doingJunio C Hamano2012-12-261-0/+44
| | | | | | | | | | | Rename the "branch1" parameter given to resolve() to "ours", to clarify what is going on. Also, annotate the unresolved_directory() function with some comments to show what decisions are made in each step, and highlight two bugs that need to be fixed. Add two tests to t4300 to illustrate these bugs. Signed-off-by: Junio C Hamano <gitster@pobox.com>
* merge-tree: fix where two branches share no changesWill Palmer2010-07-141-3/+3
| | | | | | | | | | | | | | | 15b4f7a (merge-tree: use ll_merge() not xdl_merge(), 2010-01-16) introduced a regression to merge-tree to cause it to segfault when merging files which existed in one branch, but not in the other or in the merge-base. This was caused by referencing entry->path at a time when entry was known to be possibly-NULL. To correct the problem, we save the path of the entry we came in with, as the path should be the same among all the stages no matter which sides are involved in the merge. Signed-off-by: Will Palmer <wmpalmer@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
* add basic tests for merge-treeWill Palmer2010-07-141-0/+257
merge-tree had no test cases, so here we add some very basic tests for it, including some known-breakages. [jc: with obvious/trivial fixups] Signed-off-by: Will Palmer <wmpalmer@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>