[PATCH v3 2/6] merge: make sparse-aware with ORT
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STALE1868d
From: Derrick Stolee via GitGitGadget <hidden>
Date: 2021-09-08 11:24:08
Subsystem:
the rest · Maintainer:
Linus Torvalds
Revision v3 of 3 in this series.
Revisions (3)
- v1 [diff vs current]
- v2 [diff vs current]
- v3 current
From: Derrick Stolee <redacted> Allow 'git merge' to operate without expanding a sparse index, at least not immediately. The index still will be expanded in a few cases: 1. If the merge strategy is 'recursive', then we enable command_requires_full_index at the start of the merge_recursive() method. We expect sparse-index users to also have the 'ort' strategy enabled. 2. With the 'ort' strategy, if the merge results in a conflicted file, then we expand the index before updating the working tree. The loop that iterates over the worktree replaces index entries and tracks 'origintal_cache_nr' which can become completely wrong if the index expands in the middle of the operation. This safety valve is important before that loop starts. A later change will focus this to only expand if we indeed have a conflict outside of the sparse-checkout cone. 3. Other merge strategies are executed as a 'git merge-X' subcommand, and those strategies are currently protected with the 'command_requires_full_index' guard. Some test updates are required, including a mistaken 'git checkout -b' that did not specify the base branch, causing merges to be fast-forward merges. Signed-off-by: Derrick Stolee <redacted> --- builtin/merge.c | 3 +++ merge-ort.c | 8 ++++++++ merge-recursive.c | 3 +++ t/t1092-sparse-checkout-compatibility.sh | 12 ++++++++++-- 4 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/builtin/merge.c b/builtin/merge.c
index 22f23990b37..926de328fbb 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c@@ -1276,6 +1276,9 @@ int cmd_merge(int argc, const char **argv, const char *prefix) if (argc == 2 && !strcmp(argv[1], "-h")) usage_with_options(builtin_merge_usage, builtin_merge_options); + prepare_repo_settings(the_repository); + the_repository->settings.command_requires_full_index = 0; + /* * Check if we are _not_ on a detached HEAD, i.e. if there is a * current branch.
diff --git a/merge-ort.c b/merge-ort.c
index 6eb910d6f0c..1531b4c94c2 100644
--- a/merge-ort.c
+++ b/merge-ort.c@@ -4058,6 +4058,14 @@ static int record_conflicted_index_entries(struct merge_options *opt) if (strmap_empty(&opt->priv->conflicted)) return 0; + /* + * We are in a conflicted state. These conflicts might be inside + * sparse-directory entries, so expand the index preemptively. + * Also, we set original_cache_nr below, but that might change if + * index_name_pos() calls ask for paths within sparse directories. + */ + ensure_full_index(index); + /* If any entries have skip_worktree set, we'll have to check 'em out */ state.force = 1; state.quiet = 1;
diff --git a/merge-recursive.c b/merge-recursive.c
index 3355d50e8ad..1f563cd6874 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c@@ -3750,6 +3750,9 @@ int merge_recursive(struct merge_options *opt, assert(opt->ancestor == NULL || !strcmp(opt->ancestor, "constructed merge base")); + prepare_repo_settings(opt->repo); + opt->repo->settings.command_requires_full_index = 1; + if (merge_start(opt, repo_get_commit_tree(opt->repo, h1))) return -1; clean = merge_recursive_internal(opt, h1, h2, merge_bases, result);
diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh
index ddc86bb4152..3b331a6bfe7 100755
--- a/t/t1092-sparse-checkout-compatibility.sh
+++ b/t/t1092-sparse-checkout-compatibility.sh@@ -47,7 +47,7 @@ test_expect_success 'setup' ' git checkout -b base && for dir in folder1 folder2 deep do - git checkout -b update-$dir && + git checkout -b update-$dir base && echo "updated $dir" >$dir/a && git commit -a -m "update $dir" || return 1 done &&
@@ -647,7 +647,15 @@ test_expect_success 'sparse-index is not expanded' ' echo >>sparse-index/extra.txt && ensure_not_expanded add extra.txt && echo >>sparse-index/untracked.txt && - ensure_not_expanded add . + ensure_not_expanded add . && + + ensure_not_expanded checkout -f update-deep && + test_config -C sparse-index pull.twohead ort && + ( + sane_unset GIT_TEST_MERGE_ALGORITHM && + ensure_not_expanded merge -m merge update-folder1 && + ensure_not_expanded merge -m merge update-folder2 + ) ' # NEEDSWORK: a sparse-checkout behaves differently from a full checkout
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