merge: check config before loading commits

Now that we use generation numbers from the commit-graph, we must
ensure that all commits that exist in the commit-graph are loaded
from that file instead of from the object database. Since the
commit-graph file is only checked if core.commitGraph is true, we
must check the default config before we load any commits.

In the merge builtin, the config was checked after loading the HEAD
commit. This was due to the use of the global 'branch' when checking
merge-specific config settings.

Move the config load to be between the initialization of 'branch' and
the commit lookup.

Without this change, a fast-forward merge would hit a BUG("bad
generation skip") statement in commit.c during paint_down_to_common().
This is because the HEAD commit would be loaded with "infinite"
generation but then reached by commits with "finite" generation
numbers.

Add a test to t5318-commit-graph.sh that exercises this code path to
prevent a regression.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/merge.c b/builtin/merge.c
index 5e5e4497e3f2406b6b17c3081d3174af46f9c112..b8197569465a05d4c7804a330ff02ea4e721f292 100644 (file)
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1148,14 +1148,15 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
        branch = branch_to_free = resolve_refdup("HEAD", 0, &head_oid, NULL);
        if (branch)
                skip_prefix(branch, "refs/heads/", &branch);
+
+       init_diff_ui_defaults();
+       git_config(git_merge_config, NULL);
+
        if (!branch || is_null_oid(&head_oid))
                head_commit = NULL;
        else
                head_commit = lookup_commit_or_die(&head_oid, "HEAD");
 
-       init_diff_ui_defaults();
-       git_config(git_merge_config, NULL);
-
        if (branch_mergeoptions)
                parse_branch_merge_options(branch_mergeoptions);
        argc = parse_options(argc, argv, prefix, builtin_merge_options,

diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index a380419b65bdf1ecace4c23831e76bc8a7d81962..77d85aefe7da18a0d7cc2db2baaedacead6b2e97 100755 (executable)
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -221,4 +221,13 @@ test_expect_success 'write graph in bare repo' '
 graph_git_behavior 'bare repo with graph, commit 8 vs merge 1' bare commits/8 merge/1
 graph_git_behavior 'bare repo with graph, commit 8 vs merge 2' bare commits/8 merge/2
 
+test_expect_success 'perform fast-forward merge in full repo' '
+       cd "$TRASH_DIRECTORY/full" &&
+       git checkout -b merge-5-to-8 commits/5 &&
+       git merge commits/8 &&
+       git show-ref -s merge-5-to-8 >output &&
+       git show-ref -s commits/8 >expect &&
+       test_cmp expect output
+'
+
 test_done