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Tree: 218e441daf

Author	SHA1	Message	Date
Junio C Hamano	32192e6622	[PATCH] Finish making --emu23 equivalent to pure 2-way merge. This adds #3ALT rule (and #2ALT rule for symmetry) to the read-tree 3-way merge logic that collapses paths that are added only in one branch and not in the other internally. This makes --emu23 to succeed in the last remaining case where the pure 2-way merge succeeded and earlier one failed. Running diff between t1001 and t1005 test scripts shows that the only difference between the two is that --emu23 can leave the states into separate stages so that the user can use usual 3-way merge resolution techniques to carry forward the local changes when pure 2-way merge would have refused to run. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>	20 years ago
Junio C Hamano	e7f9bc411c	[PATCH] read-tree: fix too strong index requirement #5ALT This fixes too strong index requirement 3-way merge enforces in one case: the same file is added in both branches. In this case, the original code insisted that if the index file has that path, it must match our branch and be up-to-date. However in this particular case, it only has to match it, and can be dirty. We just need to make sure that we keep the work-tree copy instead of checking out the merge result. The resolution of such a path, however, cannot be left to outside script, because we will not keep the original stage0 entries for unmerged paths when read-tree finishes, and at that point, the knowledge of "if we resolve it to match the new file added in both branches, the merge succeeds and the work tree would not lose information, but we should _not_ update the work tree from the resulting index file" is lost. For this reason, the now code needs to resolve this case (#5ALT) internally. This affects some existing tests in the test suite, but all in positive ways. In t1000 (3-way test), this #5ALT case now gets one stage0 entry, instead of an identical stage2 and stage3 entry pair, for such a path, and one test that checked for merge failure (because the test assumed the "stricter-than-necessary" behaviour) does not have to fail anymore. In t1005 (emu23 test), two tests that involves a case where the work tree already had a change introduced in the upstream (aka "merged head"), the merge succeeds instead of failing. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>	20 years ago
Junio C Hamano	03efa6d9a4	[PATCH] read-tree --emu23. This new flag causes two-way fast forward to internally use the three-way merge mechanism. This behaviour is intended to offer a better fast forward semantics when used in a dirty work tree. The new test t1005 is parallel to the existing t1001 "pure 2-way" tests, but some parts that are commented out would fail. These failures are due to three-way merge enforcing too strict index requirements for cases that could succeed. This problem will be addressed by later patches. Without even changing three-way mechanism, the --emu23 two-way fast forward already gives the user an easier-to-handle merge result when a file that "merged head" updates has local modifications. This is demonstrated as "case 16" test in t1005. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>	20 years ago
Junio C Hamano	76bc82ca0e	[PATCH] Clean up read-tree two-way tests. This is in preparation for "2-way fast-forward emulated with 3-way mechanism" series. It does not change what the tests for pure 2-way do. It only changes how it tests things, to make reviewing of differences of the two tests easier in later steps. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>	20 years ago
Junio C Hamano	c859600954	[PATCH] read-tree: save more user hassles during fast-forward. This implements the "never lose the current cache information or the work tree state, but favor a successful merge over merge failure" principle in the fast-forward two-tree merge operation. It comes with a set of tests to cover all the cases described in the case matrix found in the new documentation. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>	20 years ago