treewide, affected packages: fix build with golang 1.16

[cotequeiroz]

Maintainers: @gekmihesg @jefferyto @dangowrt @aparcar @G-M0N3Y-2503
Compile tested: mvebu, arm_cortex-a9+vfpv3-d16, openwrt master
Run tested: none
Description:
Golang 1.16 changed the default package build mode to "module-aware" mode. The intention is to drop GOPATH mode (opposite of module-aware) in go 1.17. See https://blog.golang.org/go116-module-changes

To enable GOPATH mode, this PR adds GO111MODULE=auto to GO_PKG_BUILD_VARS. Affected packages are

• restic-rest-server
• tor-fw-helper
• cni
• containerd
• docker
• dockerd
• libnetwork
• oci-runtime-tools

Sample error messages

Finding targets
no required module provides package github.com/containernetworking/cni/cnitool: working directory is not part of a module

Building targets
go: cannot find main module; see 'go help modules'

go: cannot find main module, but found vendor.conf in /builder/shared-workdir/build/sdk/build_dir/target-mipsel_24kc_musl/containerd-1.4.3/.go_work/build/src/github.com/containerd/containerd
	to create a module there, run:
	go mod init
Makefile:193: recipe for target 'bin/ctr' failed

Fixes #14879

[aparcar]

LGTM

[G-M0N3Y-2503]

It doesn't look like the PKG_RELEASE was bumped for dockerd.

But the others LGTM.

[cotequeiroz]

dockerd should be fixed now. Thanks for spotting this.

[BKPepe]

@cotequeiroz , @jefferyto since we are now using Golang 1.21 in OpenWrt master branch and as well OpenWrt 23.05, we can drop GO111MODULE=auto from Makefiles, right? It seems like leftover now. I know... 2 years later:-)

[jefferyto]

It depends on each affected package, if they have updated to using Go modules. I think most Go projects have switched, though I believe docker still has not.

tor-fw-helper has not but it also hasn't been updated in years; maybe it would be better to remove that package entirely instead.

[BKPepe]

After two years? Definitely, they updated it. If not, it needs to be reported to them. That sounds like easy job, isn't it? :)

Ok, let's drop tor-fw-helper. I will prepare PR in a sec.

[jefferyto]

After two years? Definitely, they updated it. If not, it needs to be reported to them. That sounds like easy job, isn't it? :)

docker/cli#4116 (comment)