thodg/libgit2/tests/merge/workdir/recursive.c

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• Hash : b924df1e
  Author :
  Date : 2018-01-21T18:05:45
  

  merge: reverse merge bases for recursive merge
  
  When the commits being merged have multiple merge bases, reverse the
  order when creating the virtual merge base.  This is for compatibility
  with git's merge-recursive algorithm, and ensures that we build
  identical trees.
  
  Git does this to try to use older merge bases first.  Per 8918b0c:
  
  > It seems to be the only sane way to do it: when a two-head merge is
  > done, and the merge-base and one of the two branches agree, the
  > merge assumes that the other branch has something new.
  >
  > If we start creating virtual commits from newer merge-bases, and go
  > back to older merge-bases, and then merge with newer commits again,
  > chances are that a patch is lost, _because_ the merge-base and the
  > head agree on it. Unlikely, yes, but it happened to me.
  

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• tests/merge/workdir/recursive.c

• #include "clar_libgit2.h"
  #include "git2/repository.h"
  #include "git2/merge.h"
  #include "merge.h"
  #include "../merge_helpers.h"
  #include "../conflict_data.h"
  
  static git_repository *repo;
  
  #define TEST_REPO_PATH "merge-recursive"
  
  void test_merge_workdir_recursive__initialize(void)
  {
  	repo = cl_git_sandbox_init(TEST_REPO_PATH);
  }
  
  void test_merge_workdir_recursive__cleanup(void)
  {
  	cl_git_sandbox_cleanup();
  }
  
  void test_merge_workdir_recursive__writes_conflict_with_virtual_base(void)
  {
  	git_index *index;
  	git_merge_options opts = GIT_MERGE_OPTIONS_INIT;
  	git_buf conflicting_buf = GIT_BUF_INIT;
  
  	struct merge_index_entry merge_index_entries[] = {
  		{ 0100644, "ffb36e513f5fdf8a6ba850a20142676a2ac4807d", 0, "asparagus.txt" },
  		{ 0100644, "68f6182f4c85d39e1309d97c7e456156dc9c0096", 0, "beef.txt" },
  		{ 0100644, "4b7c5650008b2e747fe1809eeb5a1dde0e80850a", 0, "bouilli.txt" },
  		{ 0100644, "c4e6cca3ec6ae0148ed231f97257df8c311e015f", 0, "gravy.txt" },
  		{ 0100644, "68af1fc7407fd9addf1701a87eb1c95c7494c598", 0, "oyster.txt" },
  		{ 0100644, "fa567f568ed72157c0c617438d077695b99d9aac", 1, "veal.txt" },
  		{ 0100644, "21950d5e4e4d1a871b4dfcf72ecb6b9c162c434e", 2, "veal.txt" },
  		{ 0100644, "3855170cef875708da06ab9ad7fc6a73b531cda1", 3, "veal.txt" },
  	};
  
  	cl_git_pass(merge_branches(repo, GIT_REFS_HEADS_DIR "branchF-1", GIT_REFS_HEADS_DIR "branchF-2", &opts, NULL));
  
  	cl_git_pass(git_repository_index(&index, repo));
  	cl_assert(merge_test_index(index, merge_index_entries, 8));
  
  	cl_git_pass(git_futils_readbuffer(&conflicting_buf, "merge-recursive/veal.txt"));
  
  	cl_assert_equal_s(CONFLICTING_RECURSIVE_F1_TO_F2, conflicting_buf.ptr);
  
  	git_index_free(index);
  	git_buf_free(&conflicting_buf);
  }
  
  void test_merge_workdir_recursive__conflicting_merge_base_with_diff3(void)
  {
  	git_index *index;
  	git_merge_options opts = GIT_MERGE_OPTIONS_INIT;
  	git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
  	git_buf conflicting_buf = GIT_BUF_INIT;
  
  	struct merge_index_entry merge_index_entries[] = {
  		{ 0100644, "ffb36e513f5fdf8a6ba850a20142676a2ac4807d", 0, "asparagus.txt" },
  		{ 0100644, "68f6182f4c85d39e1309d97c7e456156dc9c0096", 0, "beef.txt" },
  		{ 0100644, "4b7c5650008b2e747fe1809eeb5a1dde0e80850a", 0, "bouilli.txt" },
  		{ 0100644, "c4e6cca3ec6ae0148ed231f97257df8c311e015f", 0, "gravy.txt" },
  		{ 0100644, "68af1fc7407fd9addf1701a87eb1c95c7494c598", 0, "oyster.txt" },
  		{ 0100644, "0b01d2f70a1c6b9ab60c382f3f9cdc8173da6736", 1, "veal.txt" },
  		{ 0100644, "37a5054a9f9b4628e3924c5cb8f2147c6e2a3efc", 2, "veal.txt" },
  		{ 0100644, "d604c75019c282144bdbbf3fd3462ba74b240efc", 3, "veal.txt" },
  	};
  
  	opts.file_flags |= GIT_MERGE_FILE_STYLE_DIFF3;
  	checkout_opts.checkout_strategy |= GIT_CHECKOUT_CONFLICT_STYLE_DIFF3;
  
  	cl_git_pass(merge_branches(repo, GIT_REFS_HEADS_DIR "branchH-2", GIT_REFS_HEADS_DIR "branchH-1", &opts, &checkout_opts));
  
  	cl_git_pass(git_repository_index(&index, repo));
  	cl_assert(merge_test_index(index, merge_index_entries, 8));
  
  	cl_git_pass(git_futils_readbuffer(&conflicting_buf, "merge-recursive/veal.txt"));
  
  	cl_assert_equal_s(CONFLICTING_RECURSIVE_H2_TO_H1_WITH_DIFF3, conflicting_buf.ptr);
  
  	git_index_free(index);
  	git_buf_free(&conflicting_buf);
  }
  

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