Support FindCommitsRequest order (--topo-order)

Implement FindCommitsRequest with order argument to find commits
using git log --topo-order.

6 files changed, 247 insertions, 134 deletions

diff --git a/changelogs/unreleased/2240-find-commits-request-order-topo.yml b/changelogs/unreleased/2240-find-commits-request-order-topo.yml
new file mode 100644
index 000000000..1ad0660ba
--- /dev/null
+++ b/changelogs/unreleased/2240-find-commits-request-order-topo.yml
@@ -0,0 +1,5 @@
+---
+title: Support FindCommitsRequest with order (--topo-order)
+merge_request: 1791
+author:
+type: added
diff --git a/internal/service/commit/find_commits.go b/internal/service/commit/find_commits.go
index b31e44bf8..e01dad522 100644
--- a/internal/service/commit/find_commits.go
+++ b/internal/service/commit/find_commits.go
@@ -198,5 +198,9 @@ func getLogCommandSubCmd(req *gitalypb.FindCommitsRequest) git.SubCmd {
 			subCmd.PostSepArgs = append(subCmd.PostSepArgs, string(path))
 		}
 	}
+	if req.GetOrder() == gitalypb.FindCommitsRequest_TOPO {
+		subCmd.Flags = append(subCmd.Flags, git.Flag{Name: "--topo-order"})
+	}
+
 	return subCmd
 }
diff --git a/internal/service/commit/find_commits_test.go b/internal/service/commit/find_commits_test.go
index eaade046e..29a7eee95 100644
--- a/internal/service/commit/find_commits_test.go
+++ b/internal/service/commit/find_commits_test.go
@@ -330,6 +330,64 @@ func TestSuccessfulFindCommitsRequest(t *testing.T) {
 				"59e29889be61e6e0e5e223bfa9ac2721d31605b8",
 			},
 		},
+		{
+			// Ordering by none implies that commits appear in
+			// chronological order:
+			//
+			// git log --graph -n 6 --pretty=format:"%h" --date-order 0031876
+			// *   0031876
+			// |\
+			// * | bf6e164
+			// | * 48ca272
+			// * | 9d526f8
+			// | * 335bc94
+			// |/
+			// * 1039376
+			desc: "ordered by none",
+			request: &gitalypb.FindCommitsRequest{
+				Repository: testRepo,
+				Revision:   []byte("0031876"),
+				Order:      gitalypb.FindCommitsRequest_NONE,
+				Limit:      6,
+			},
+			ids: []string{
+				"0031876facac3f2b2702a0e53a26e89939a42209",
+				"bf6e164cac2dc32b1f391ca4290badcbe4ffc5fb",
+				"48ca272b947f49eee601639d743784a176574a09",
+				"9d526f87b82e2b2fd231ca44c95508e5e85624ca",
+				"335bc94d5b7369b10251e612158da2e4a4aaa2a5",
+				"1039376155a0d507eba0ea95c29f8f5b983ea34b",
+			},
+		},
+		{
+			// When ordering by topology, all commit children will
+			// be shown before parents:
+			//
+			// git log --graph -n 6 --pretty=format:"%h" --topo-order 0031876
+			// *   0031876
+			// |\
+			// | * 48ca272
+			// | * 335bc94
+			// * | bf6e164
+			// * | 9d526f8
+			// |/
+			// * 1039376
+			desc: "ordered by topo",
+			request: &gitalypb.FindCommitsRequest{
+				Repository: testRepo,
+				Revision:   []byte("0031876"),
+				Order:      gitalypb.FindCommitsRequest_TOPO,
+				Limit:      6,
+			},
+			ids: []string{
+				"0031876facac3f2b2702a0e53a26e89939a42209",
+				"48ca272b947f49eee601639d743784a176574a09",
+				"335bc94d5b7369b10251e612158da2e4a4aaa2a5",
+				"bf6e164cac2dc32b1f391ca4290badcbe4ffc5fb",
+				"9d526f87b82e2b2fd231ca44c95508e5e85624ca",
+				"1039376155a0d507eba0ea95c29f8f5b983ea34b",
+			},
+		},
 	}
 
 	for _, tc := range testCases {
diff --git a/proto/commit.proto b/proto/commit.proto
index 2b23be008..13fbac68f 100644
--- a/proto/commit.proto
+++ b/proto/commit.proto
@@ -334,6 +334,11 @@ message FindCommitsRequest {
   bool all = 11;
   bool first_parent = 12;
   bytes author = 13;
+  enum Order {
+    NONE = 0;
+    TOPO = 1;
+  }
+  Order order = 14;
 }
 
 // A single 'page' of the result set
diff --git a/proto/go/gitalypb/commit.pb.go b/proto/go/gitalypb/commit.pb.go
index 34ca9e1d0..9a2e5a06a 100644
--- a/proto/go/gitalypb/commit.pb.go
+++ b/proto/go/gitalypb/commit.pb.go
@@ -114,6 +114,31 @@ func (FindAllCommitsRequest_Order) EnumDescriptor() ([]byte, []int) {
 	return fileDescriptor_db7163399a465f48, []int{23, 0}
 }
 
+type FindCommitsRequest_Order int32
+
+const (
+	FindCommitsRequest_NONE FindCommitsRequest_Order = 0
+	FindCommitsRequest_TOPO FindCommitsRequest_Order = 1
+)
+
+var FindCommitsRequest_Order_name = map[int32]string{
+	0: "NONE",
+	1: "TOPO",
+}
+
+var FindCommitsRequest_Order_value = map[string]int32{
+	"NONE": 0,
+	"TOPO": 1,
+}
+
+func (x FindCommitsRequest_Order) String() string {
+	return proto.EnumName(FindCommitsRequest_Order_name, int32(x))
+}
+
+func (FindCommitsRequest_Order) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_db7163399a465f48, []int{25, 0}
+}
+
 type CommitStatsRequest struct {
 	Repository           *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
 	Revision             []byte      `protobuf:"bytes,2,opt,name=revision,proto3" json:"revision,omitempty"`
@@ -1455,12 +1480,13 @@ type FindCommitsRequest struct {
 	After       *timestamp.Timestamp `protobuf:"bytes,9,opt,name=after,proto3" json:"after,omitempty"`
 	Before      *timestamp.Timestamp `protobuf:"bytes,10,opt,name=before,proto3" json:"before,omitempty"`
 	// all and revision are mutually exclusive
-	All                  bool     `protobuf:"varint,11,opt,name=all,proto3" json:"all,omitempty"`
-	FirstParent          bool     `protobuf:"varint,12,opt,name=first_parent,json=firstParent,proto3" json:"first_parent,omitempty"`
-	Author               []byte   `protobuf:"bytes,13,opt,name=author,proto3" json:"author,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	All                  bool                     `protobuf:"varint,11,opt,name=all,proto3" json:"all,omitempty"`
+	FirstParent          bool                     `protobuf:"varint,12,opt,name=first_parent,json=firstParent,proto3" json:"first_parent,omitempty"`
+	Author               []byte                   `protobuf:"bytes,13,opt,name=author,proto3" json:"author,omitempty"`
+	Order                FindCommitsRequest_Order `protobuf:"varint,14,opt,name=order,proto3,enum=gitaly.FindCommitsRequest_Order" json:"order,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                 `json:"-"`
+	XXX_unrecognized     []byte                   `json:"-"`
+	XXX_sizecache        int32                    `json:"-"`
 }
 
 func (m *FindCommitsRequest) Reset()         { *m = FindCommitsRequest{} }
@@ -1579,6 +1605,13 @@ func (m *FindCommitsRequest) GetAuthor() []byte {
 	return nil
 }
 
+func (m *FindCommitsRequest) GetOrder() FindCommitsRequest_Order {
+	if m != nil {
+		return m.Order
+	}
+	return FindCommitsRequest_NONE
+}
+
 // A single 'page' of the result set
 type FindCommitsResponse struct {
 	Commits              []*GitCommit `protobuf:"bytes,1,rep,name=commits,proto3" json:"commits,omitempty"`
@@ -2631,6 +2664,7 @@ func init() {
 	proto.RegisterEnum("gitaly.TreeEntryResponse_ObjectType", TreeEntryResponse_ObjectType_name, TreeEntryResponse_ObjectType_value)
 	proto.RegisterEnum("gitaly.TreeEntry_EntryType", TreeEntry_EntryType_name, TreeEntry_EntryType_value)
 	proto.RegisterEnum("gitaly.FindAllCommitsRequest_Order", FindAllCommitsRequest_Order_name, FindAllCommitsRequest_Order_value)
+	proto.RegisterEnum("gitaly.FindCommitsRequest_Order", FindCommitsRequest_Order_name, FindCommitsRequest_Order_value)
 	proto.RegisterType((*CommitStatsRequest)(nil), "gitaly.CommitStatsRequest")
 	proto.RegisterType((*CommitStatsResponse)(nil), "gitaly.CommitStatsResponse")
 	proto.RegisterType((*CommitIsAncestorRequest)(nil), "gitaly.CommitIsAncestorRequest")
@@ -2683,135 +2717,136 @@ func init() {
 func init() { proto.RegisterFile("commit.proto", fileDescriptor_db7163399a465f48) }
 
 var fileDescriptor_db7163399a465f48 = []byte{
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/ruby/proto/gitaly/commit_pb.rb b/ruby/proto/gitaly/commit_pb.rb
index bd45aad10..0bc7ce725 100644
--- a/ruby/proto/gitaly/commit_pb.rb
+++ b/ruby/proto/gitaly/commit_pb.rb
@@ -153,6 +153,11 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
     optional :all, :bool, 11
     optional :first_parent, :bool, 12
     optional :author, :bytes, 13
+    optional :order, :enum, 14, "gitaly.FindCommitsRequest.Order"
+  end
+  add_enum "gitaly.FindCommitsRequest.Order" do
+    value :NONE, 0
+    value :TOPO, 1
   end
   add_message "gitaly.FindCommitsResponse" do
     repeated :commits, :message, 1, "gitaly.GitCommit"
@@ -276,6 +281,7 @@ module Gitaly
   FindAllCommitsRequest::Order = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindAllCommitsRequest.Order").enummodule
   FindAllCommitsResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindAllCommitsResponse").msgclass
   FindCommitsRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindCommitsRequest").msgclass
+  FindCommitsRequest::Order = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindCommitsRequest.Order").enummodule
   FindCommitsResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindCommitsResponse").msgclass
   CommitLanguagesRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.CommitLanguagesRequest").msgclass
   CommitLanguagesResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.CommitLanguagesResponse").msgclass