From: Johannes Schindelin <johannes.schindelin@xxxxxx>
When specifying a merge base explicitly, there is actually no good
reason why the inputs need to be commits: that's only needed if the
merge base has to be deduced from the commit graph.
This commit is best viewed with `--color-moved
--color-moved-ws=allow-indentation-change`.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
merge-tree: accept 3 trees as arguments
I was asked to implement this at $dayjob and it seems like a feature
that might be useful to other users, too.
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1647%2Fdscho%2Fallow-merge-tree-to-accept-3-trees-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1647/dscho/allow-merge-tree-to-accept-3-trees-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/1647
Documentation/git-merge-tree.txt | 5 +++-
builtin/merge-tree.c | 42 +++++++++++++++++++-------------
t/t4301-merge-tree-write-tree.sh | 8 ++++++
3 files changed, 37 insertions(+), 18 deletions(-)
diff --git a/Documentation/git-merge-tree.txt b/Documentation/git-merge-tree.txt
index b50acace3bc..214e30c70ba 100644
--- a/Documentation/git-merge-tree.txt
+++ b/Documentation/git-merge-tree.txt
@@ -64,10 +64,13 @@ OPTIONS
share no common history. This flag can be given to override that
check and make the merge proceed anyway.
---merge-base=<commit>::
+--merge-base=<tree-ish>::
Instead of finding the merge-bases for <branch1> and <branch2>,
specify a merge-base for the merge, and specifying multiple bases is
currently not supported. This option is incompatible with `--stdin`.
++
+As the merge-base is provided directly, <branch1> and <branch2> do not need
+o specify commits; it is sufficient if they specify trees.
[[OUTPUT]]
OUTPUT
diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
index 3bdec53fbe5..cbd8e15af6d 100644
--- a/builtin/merge-tree.c
+++ b/builtin/merge-tree.c
@@ -429,35 +429,43 @@ static int real_merge(struct merge_tree_options *o,
struct merge_options opt;
copy_merge_options(&opt, &o->merge_options);
- parent1 = get_merge_parent(branch1);
- if (!parent1)
- help_unknown_ref(branch1, "merge-tree",
- _("not something we can merge"));
-
- parent2 = get_merge_parent(branch2);
- if (!parent2)
- help_unknown_ref(branch2, "merge-tree",
- _("not something we can merge"));
-
opt.show_rename_progress = 0;
opt.branch1 = branch1;
opt.branch2 = branch2;
if (merge_base) {
- struct commit *base_commit;
struct tree *base_tree, *parent1_tree, *parent2_tree;
- base_commit = lookup_commit_reference_by_name(merge_base);
- if (!base_commit)
- die(_("could not lookup commit '%s'"), merge_base);
+ /*
+ * We actually only need the trees because we already
+ * have a merge base.
+ */
+ struct object_id base_oid, head_oid, merge_oid;
+
+ if (repo_get_oid_treeish(the_repository, merge_base, &base_oid))
+ die(_("could not parse as tree '%s'"), merge_base);
+ base_tree = parse_tree_indirect(&base_oid);
+ if (repo_get_oid_treeish(the_repository, branch1, &head_oid))
+ die(_("could not parse as tree '%s'"), branch1);
+ parent1_tree = parse_tree_indirect(&head_oid);
+ if (repo_get_oid_treeish(the_repository, branch2, &merge_oid))
+ die(_("could not parse as tree '%s'"), branch2);
+ parent2_tree = parse_tree_indirect(&merge_oid);
opt.ancestor = merge_base;
- base_tree = repo_get_commit_tree(the_repository, base_commit);
- parent1_tree = repo_get_commit_tree(the_repository, parent1);
- parent2_tree = repo_get_commit_tree(the_repository, parent2);
merge_incore_nonrecursive(&opt, base_tree, parent1_tree, parent2_tree, &result);
} else {
+ parent1 = get_merge_parent(branch1);
+ if (!parent1)
+ help_unknown_ref(branch1, "merge-tree",
+ _("not something we can merge"));
+
+ parent2 = get_merge_parent(branch2);
+ if (!parent2)
+ help_unknown_ref(branch2, "merge-tree",
+ _("not something we can merge"));
+
/*
* Get the merge bases, in reverse order; see comment above
* merge_incore_recursive in merge-ort.h
diff --git a/t/t4301-merge-tree-write-tree.sh b/t/t4301-merge-tree-write-tree.sh
index 12ac4368736..71f21bb834f 100755
--- a/t/t4301-merge-tree-write-tree.sh
+++ b/t/t4301-merge-tree-write-tree.sh
@@ -945,4 +945,12 @@ test_expect_success 'check the input format when --stdin is passed' '
test_cmp expect actual
'
+test_expect_success '--merge-base with tree OIDs' '
+ git merge-tree --merge-base=side1^ side1 side3 >tree &&
+ tree=$(cat tree) &&
+ git merge-tree --merge-base=side1^^{tree} side1^{tree} side3^{tree} >tree2 &&
+ tree2=$(cat tree2) &&
+ test $tree = $tree2
+'
+
test_done
base-commit: e02ecfcc534e2021aae29077a958dd11c3897e4c
--
gitgitgadget
