From 5b448b8530308b1f5a7a721cb1bf0ba557b5c78d Mon Sep 17 00:00:00 2001 From: Elijah Newren Date: Thu, 11 Aug 2011 23:20:10 -0600 Subject: [PATCH] merge-recursive: When we detect we can skip an update, actually skip it In 882fd11 (merge-recursive: Delay content merging for renames 2010-09-20), there was code that checked for whether we could skip updating a file in the working directory, based on whether the merged version matched the current working copy. Due to the desire to handle directory/file conflicts that were resolvable, that commit deferred content merging by first updating the index with the unmerged entries and then moving the actual merging (along with the skip-the-content-update check) to another function that ran later in the merge process. As part moving the content merging code, a bug was introduced such that although the message about skipping the update would be printed (whenever GIT_MERGE_VERBOSITY was sufficiently high), the file would be unconditionally updated in the working copy anyway. When we detect that the file does not need to be updated in the working copy, update the index appropriately and then return early before updating the working copy. Note that there was a similar change in b2c8c0a (merge-recursive: When we detect we can skip an update, actually skip it 2011-02-28), but it was reverted by 6db4105 (Revert "Merge branch 'en/merge-recursive'" 2011-05-19) since it did not fix both of the relevant types of unnecessary update breakages and, worse, it made use of some band-aids that caused other problems. The reason this change works is due to the changes earlier in this series to (a) record_df_conflict_files instead of just unlinking them early, (b) allowing make_room_for_path() to remove D/F entries, (c) the splitting of update_stages_and_entry() to have its functionality called at different points, and (d) making the pathnames of the files involved in the merge available to merge_content(). Signed-off-by: Elijah Newren Signed-off-by: Junio C Hamano --- merge-recursive.c | 19 ++++++++++++++++--- t/t6022-merge-rename.sh | 4 ++-- 2 files changed, 18 insertions(+), 5 deletions(-) diff --git a/merge-recursive.c b/merge-recursive.c index a3bbca8d58..8b88d6266c 100644 --- a/merge-recursive.c +++ b/merge-recursive.c @@ -1354,6 +1354,7 @@ static int merge_content(struct merge_options *o, { const char *reason = "content"; char *side1 = NULL, *side2 = NULL; + const char *path1 = NULL, *path2 = NULL; struct merge_file_info mfi; struct diff_filespec one, a, b; unsigned df_conflict_remains = 0; @@ -1371,7 +1372,6 @@ static int merge_content(struct merge_options *o, b.mode = b_mode; if (rename_conflict_info) { - const char *path1, *path2; struct diff_filepair *pair1 = rename_conflict_info->pair1; path1 = (o->branch1 == rename_conflict_info->branch1) ? @@ -1397,9 +1397,22 @@ static int merge_content(struct merge_options *o, free(side2); if (mfi.clean && !df_conflict_remains && - sha_eq(mfi.sha, a_sha) && mfi.mode == a.mode) + sha_eq(mfi.sha, a_sha) && mfi.mode == a_mode) { + int path_renamed_outside_HEAD; output(o, 3, "Skipped %s (merged same as existing)", path); - else + /* + * The content merge resulted in the same file contents we + * already had. We can return early if those file contents + * are recorded at the correct path (which may not be true + * if the merge involves a rename). + */ + path_renamed_outside_HEAD = !path2 || !strcmp(path, path2); + if (!path_renamed_outside_HEAD) { + add_cacheinfo(mfi.mode, mfi.sha, path, + 0 /*stage*/, 1 /*refresh*/, 0 /*options*/); + return mfi.clean; + } + } else output(o, 2, "Auto-merging %s", path); if (!mfi.clean) { diff --git a/t/t6022-merge-rename.sh b/t/t6022-merge-rename.sh index 4695cbccb1..d96d3c5975 100755 --- a/t/t6022-merge-rename.sh +++ b/t/t6022-merge-rename.sh @@ -631,7 +631,7 @@ test_expect_success 'setup avoid unnecessary update, normal rename' ' git commit -m "Random, unrelated changes" ' -test_expect_failure 'avoid unnecessary update, normal rename' ' +test_expect_success 'avoid unnecessary update, normal rename' ' git checkout -q avoid-unnecessary-update-1^0 && test-chmtime =1000000000 rename && test-chmtime -v +0 rename >expect && @@ -664,7 +664,7 @@ test_expect_success 'setup to test avoiding unnecessary update, with D/F conflic git commit -m "Only unrelated changes" ' -test_expect_failure 'avoid unnecessary update, with D/F conflict' ' +test_expect_success 'avoid unnecessary update, with D/F conflict' ' git checkout -q avoid-unnecessary-update-2^0 && test-chmtime =1000000000 df && test-chmtime -v +0 df >expect &&