From e0240a60023841709f8095e475d13d090f17e915 Mon Sep 17 00:00:00 2001
From: Simon Ruderich <simon@ruderich.org>
Date: Sun, 15 Jan 2023 10:44:12 +0100
Subject: [PATCH] remote: support creating files with missing parents in
 dry-run

The actual run worked fine but the dry-run failed because the parent
directory does not exist at that point.
---
 remote/sync/files.go      |  8 +++++
 remote/sync/files_test.go | 75 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+)

diff --git a/remote/sync/files.go b/remote/sync/files.go
index 20f8505..56c9ff0 100644
--- a/remote/sync/files.go
+++ b/remote/sync/files.go
@@ -132,6 +132,14 @@ func (s *Sync) syncFile(file *safcm.File, changed *bool) error {
 
 	parentFd, baseName, err := OpenParentDirectoryNoSymlinks(file.Path)
 	if err != nil {
+		if os.IsNotExist(err) && s.req.DryRun {
+			change.Created = true
+			debugf("will create (parent missing)")
+			*changed = true
+			debugf("dry-run, skipping changes")
+			s.resp.FileChanges = append(s.resp.FileChanges, change)
+			return nil
+		}
 		return err
 	}
 	defer unix.Close(parentFd)
diff --git a/remote/sync/files_test.go b/remote/sync/files_test.go
index bae2597..81efd08 100644
--- a/remote/sync/files_test.go
+++ b/remote/sync/files_test.go
@@ -1006,6 +1006,44 @@ func TestSyncFile(t *testing.T) {
 			nil,
 		},
 
+		{
+			"file: create, missing parent (dry-run)",
+			safcm.MsgSyncReq{
+				DryRun: true,
+			},
+			&safcm.File{
+				Path:      "does-not-exist/file",
+				Mode:      0644,
+				Uid:       -1,
+				Gid:       -1,
+				Data:      []byte("content\n"),
+				OrigGroup: "group",
+			},
+			nil,
+			true,
+			[]ft.File{root},
+			safcm.MsgSyncResp{
+				FileChanges: []safcm.FileChange{
+					{
+						Path:    "does-not-exist/file",
+						Created: true,
+						New: safcm.FileChangeInfo{
+							Mode:  0644,
+							User:  user,
+							Uid:   uid,
+							Group: group,
+							Gid:   gid,
+						},
+					},
+				},
+			},
+			[]string{
+				`4: files: "does-not-exist/file" (group): will create (parent missing)`,
+				`4: files: "does-not-exist/file" (group): dry-run, skipping changes`,
+			},
+			nil,
+		},
+
 		{
 			"file: unchanged",
 			safcm.MsgSyncReq{},
@@ -1486,6 +1524,43 @@ func TestSyncFile(t *testing.T) {
 			nil,
 		},
 
+		{
+			"directory: create, missing parent (dry-run)",
+			safcm.MsgSyncReq{
+				DryRun: true,
+			},
+			&safcm.File{
+				Path:      "does-not-exist/dir",
+				Mode:      fs.ModeDir | 0755,
+				Uid:       -1,
+				Gid:       -1,
+				OrigGroup: "group",
+			},
+			nil,
+			true,
+			[]ft.File{root},
+			safcm.MsgSyncResp{
+				FileChanges: []safcm.FileChange{
+					{
+						Path:    "does-not-exist/dir",
+						Created: true,
+						New: safcm.FileChangeInfo{
+							Mode:  fs.ModeDir | 0755,
+							User:  user,
+							Uid:   uid,
+							Group: group,
+							Gid:   gid,
+						},
+					},
+				},
+			},
+			[]string{
+				`4: files: "does-not-exist/dir" (group): will create (parent missing)`,
+				`4: files: "does-not-exist/dir" (group): dry-run, skipping changes`,
+			},
+			nil,
+		},
+
 		{
 			"directory: unchanged",
 			safcm.MsgSyncReq{},
-- 
2.43.2