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Merge pull request #33233 from tiborvass/report-2017-05-15

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Add dev report for may 15th
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# Development Report for May 15, 2017
## Daily Meeting
A daily meeting is hosted on [slack](https://dockercommunity.slack.com) every business day at 9am PST on the channel `#moby-project`.
During this meeting, we are talking about the [tasks](https://github.com/moby/moby/issues/32867) needed to be done for splitting moby and docker.
## Topics discussed last week
### The CLI split
Work is in progress to move the "opts" package to the docker/cli repository. The package, was merged into the docker/cli
repository through [docker/cli#82](https://github.com/docker/cli/pull/82), preserving Git history, and parts that are not
used in Moby have been removed through [moby/moby#33198](https://github.com/moby/moby/pull/33198).
### Find a good and non-confusing home for the remaining monolith
Discussion on this topic is still ongoing, and possible approaches are looked into. The active discussion has moved
from GitHub to [https://forums.mobyproject.org/](https://forums.mobyproject.org/t/topic-find-a-good-an-non-confusing-home-for-the-remaining-monolith/37)
### Find a place for `/pkg`
Concerns were raised about moving packages to separate repositories, and it was decided to put some extra effort into
breaking up / removing existing packages that likely are not good candidates to become a standalone project.
### Update integration-cli tests
With the removal of the CLI from the moby repository, new pull requests will have to be tested using API tests instead
of using the CLI. Discussion took place whether or not these tests should use the API `client` package, or be completely
independend, and make raw HTTP calls.
A topic was created on the forum to discuss options: [evolution of testing](https://forums.mobyproject.org/t/evolution-of-testing-moby/38)
### Proposal: split & containerize hack/validate
[@AkihiroSuda](https://github.com/AkihiroSuda) is proposing to split and containerize the `hack/validate` script and
[started a topic on the forum](https://forums.mobyproject.org/t/proposal-split-containerize-hack-validate/32). An initial
proposal to add validation functionality to `vndr` (the vendoring tool in use) was rejected upstream, so alternative
approaches were discussed.
### Special Interest Groups
A "SIG" category was created on the forums to provide a home for Special Interest Groups. The first SIG, [LinuxKit
Security](https://forums.mobyproject.org/t/about-the-linuxkit-security-category/44) was started (thanks
[@riyazdf](https://github.com/riyazdf)).
### Builder
The builder dev report can be found [here](builder/2017-05-15.md)

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# Development Report for May 15, 2017
### Multi-stage builds fixes coming in 17.06-rc1
Some bugs were discovered in new multi-stage build feature, release in 17.05.
When using an image name directly in `COPY --from` without defining a build stage, the data associated with that image was not properly cleaned up.
If a second was based on `scratch` image, the metadata from the previous stage didn't get reset, forcing the user to clear it manually with extra commands.
Fixes for these are merged for the next release, everyone is welcomed to test it once `17.06-rc1` is out.
- [Fix resetting image metadata between stages for scratch case](https://github.com/moby/moby/pull/33179)
- [Fix releasing implicit mounts](https://github.com/moby/moby/pull/33090)
- [Fix a case where using FROM scratch as NAME would fail](https://github.com/moby/moby/pull/32997)
### Quality: Dependency interface switch
Work continues on making the builder dependency interface more stable. This week methods for getting access to source image were swapped out to a new version that keeps a reference to image data until build job has complete.
Merged as part of this effort:
- [Expose GetImage interface for builder](https://github.com/moby/moby/pull/33054)
In review:
- [Refactor builder probe cache and container backend](https://github.com/moby/moby/pull/33061)
- [Refactor COPY/ADD dispatchers](https://github.com/moby/moby/pull/33116)
### New feature: Long running session
PR for [adding long-running session between daemon and cli](https://github.com/moby/moby/pull/32677) that enables advanced features like incremental context send, build credentials from the client, ssh forwarding etc.
@simonferquel updated a [grpc-only version of that interface](https://github.com/moby/moby/pull/33047) and mostly seems that consensus was achieved for using only grpc transport. @tonistiigi finished up persistent cache layer and garbage collection for file transfers. The PR now needs to be split up because CLI has moved. Once that is done, the main PR should be ready for review early this week.
### Merged: Specifying any remote ref in git checkout URLs
Building from git sources now allows [specifying any remote ref](https://github.com/moby/moby/pull/32502). For example, to build a pull request from GitHub you can use: `docker build git://github.com/moby/moby#pull/32502/head`.
### Proposals for new Dockerfile features that need design feedback:
[Add IMPORT/EXPORT commands to Dockerfile](https://github.com/moby/moby/issues/32100)
[Add `DOCKEROS/DOCKERARCH` default ARG to Dockerfile](https://github.com/moby/moby/issues/32487)
[Add support for `RUN --mount`](https://github.com/moby/moby/issues/32507)
[DAG image builder](https://github.com/moby/moby/issues/32550)
[Option to export the hash of the build context](https://github.com/moby/moby/issues/32963) (new)
[Allow --cache-from=*](https://github.com/moby/moby/issues/33002#issuecomment-299041162) (new)
If you are interested in implementing any of them, leave a comment on the specific issues.
### Other new builder features currently in code-review:
-
### Backlog:
[Build secrets](https://github.com/moby/moby/pull/30637) will be brought up again in next maintainer's meeting to evaluate how to move on with this, if any other proposals have changed the objective and if we should wait for swarm secrets to be available first.