failed to solve with frontend dockerfile.v0 when trying to use buildkit by a docker client in golang

[JasonChen233]

I am trying to activate buildkit through a docker client in golang by setting the version field in ImageBuildOptions
Version: types.BuilderBuildKit
I get the following error info.Am I using the api wrong.Is there any Docs can help?
By the way, It seems that the response format is diffrerent. Where can I find the response format docs?
`...........
{"id":"moby.buildkit.trace","aux":"Cr0BCkdzaGEyNTY6YzhkN2FjMzYyNmFhYmYxZmY3NjkxYTBhZmQ4MmNiNTIzZTM4NTFhZDExMTNiOGUzNzViY2RmNmNlOTU1NWIxYhJHc2hhMjU2OjM5MzViNGMzZWU5ZDNkNjExMDZiZTc1YTliOTY1MmZkZGM4MDFmYjhlNDIzMTY2NzZlMTBjMjA2ZGJhNzFhOGQaD2NvcHkgL2NvbnRleHQgLyoLCNX844sGEMSKykQyCwjY/OOLBhDY7MJI"}
{"id":"moby.buildkit.trace","aux":"Co4BCkdzaGEyNTY6YWMwNzJkNTIxOTAxMjIyZWVlZjU1MGY1MjI4Mjg3N2YxOTZlMTZiMDI0Nzg0NGJlOWNlYjFjY2MxZWFjMzkxZBo2cmVzb2x2ZSBpbWFnZSBjb25maWcgZm9yIGRvY2tlci5pby9kb2NrZXIvZG9ja2VyZmlsZToxKgsI2PzjiwYQpJytfQ=="}
{"id":"moby.buildkit.trace","aux":"CrABCkdzaGEyNTY6YWMwNzJkNTIxOTAxMjIyZWVlZjU1MGY1MjI4Mjg3N2YxOTZlMTZiMDI0Nzg0NGJlOWNlYjFjY2MxZWFjMzkxZBo2cmVzb2x2ZSBpbWFnZSBjb25maWcgZm9yIGRvY2tlci5pby9kb2NrZXIvZG9ja2VyZmlsZToxKgsI2PzjiwYQpJytfTIMCNn844sGEOil9J4BOhJubyBhY3RpdmUgc2Vzc2lvbnM="}

{"errorDetail":{"message":"failed to solve with frontend dockerfile.v0: failed to solve with frontend gateway.v0: no active sessions"},"error":"failed to solve with frontend dockerfile.v0: failed to solve with fron end gateway.v0: no active sessions"}
`

I am using docker on MAC
Client:
Cloud integration: 1.0.17
Version: 20.10.7
API version: 1.41
Go version: go1.16.4
Git commit: f0df350
Built: Wed Jun 2 11:56:22 2021
OS/Arch: darwin/amd64
Context: default
Experimental: true

Server: Docker Engine - Community
Engine:
Version: 20.10.7
API version: 1.41 (minimum version 1.12)
Go version: go1.13.15
Git commit: b0f5bc3
Built: Wed Jun 2 11:54:58 2021
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.4.6
GitCommit: d71fcd7d8303cbf684402823e425e9dd2e99285d
runc:
Version: 1.0.0-rc95
GitCommit: b9ee9c6314599f1b4a7f497e1f1f856fe433d3b7
docker-init:
Version: 0.19.0
GitCommit: de40ad0

And I had try all the following statement on the top of the Dockerfile
#syntax=docker/dockerfile:1
#syntax=docker/dockerfile:1.2
#syntax=docker/dockerfile:1.3

[JasonChen233]

I Google the error info but mostly say that the dockerfile should be named Dockerfile instead of dockerfile. But I have named it Dockerfile

[tonistiigi]

You need to dial a session connection as well to transfer local files.

Communication with buildkit should happen through grpc API. I wouldn't recommend to reverse engineer the HTTP connection. That code is being removed from docker cli as well docker/cli#3314

[JasonChen233]

Oh I see. I read the code of runBuild,and found that to activate buildkit I should work like func runBuildBuildKit.A seesion is needed.
Thanks a lot, have a good day

[ting6688]

Oh I see. I read the code of runBuild,and found that to activate buildkit I should work like func runBuildBuildKit.A seesion is needed. Thanks a lot, have a good day

so, How did you solve it? Thanks a lot!