This is a follow-up to 0e73168b7e
This repository is not yet a module (i.e., does not have a `go.mod`). This
is not problematic when building the code in GOPATH or "vendor" mode, but
when using the code as a module-dependency (in module-mode), different semantics
are applied since Go1.21, which switches Go _language versions_ on a per-module,
per-package, or even per-file base.
A condensed summary of that logic [is as follows][1]:
- For modules that have a go.mod containing a go version directive; that
version is considered a minimum _required_ version (starting with the
go1.19.13 and go1.20.8 patch releases: before those, it was only a
recommendation).
- For dependencies that don't have a go.mod (not a module), go language
version go1.16 is assumed.
- Likewise, for modules that have a go.mod, but the file does not have a
go version directive, go language version go1.16 is assumed.
- If a go.work file is present, but does not have a go version directive,
language version go1.17 is assumed.
When switching language versions, Go _downgrades_ the language version,
which means that language features (such as generics, and `any`) are not
available, and compilation fails. For example:
# github.com/docker/cli/cli/context/store
/go/pkg/mod/github.com/docker/cli@v25.0.0-beta.2+incompatible/cli/context/store/storeconfig.go:6:24: predeclared any requires go1.18 or later (-lang was set to go1.16; check go.mod)
/go/pkg/mod/github.com/docker/cli@v25.0.0-beta.2+incompatible/cli/context/store/store.go:74:12: predeclared any requires go1.18 or later (-lang was set to go1.16; check go.mod)
Note that these fallbacks are per-module, per-package, and can even be
per-file, so _(indirect) dependencies_ can still use modern language
features, as long as their respective go.mod has a version specified.
Unfortunately, these failures do not occur when building locally (using
vendor / GOPATH mode), but will affect consumers of the module.
Obviously, this situation is not ideal, and the ultimate solution is to
move to go modules (add a go.mod), but this comes with a non-insignificant
risk in other areas (due to our complex dependency tree).
We can revert to using go1.16 language features only, but this may be
limiting, and may still be problematic when (e.g.) matching signatures
of dependencies.
There is an escape hatch: adding a `//go:build` directive to files that
make use of go language features. From the [go toolchain docs][2]:
> The go line for each module sets the language version the compiler enforces
> when compiling packages in that module. The language version can be changed
> on a per-file basis by using a build constraint.
>
> For example, a module containing code that uses the Go 1.21 language version
> should have a `go.mod` file with a go line such as `go 1.21` or `go 1.21.3`.
> If a specific source file should be compiled only when using a newer Go
> toolchain, adding `//go:build go1.22` to that source file both ensures that
> only Go 1.22 and newer toolchains will compile the file and also changes
> the language version in that file to Go 1.22.
This patch adds `//go:build` directives to those files using recent additions
to the language. It's currently using go1.19 as version to match the version
in our "vendor.mod", but we can consider being more permissive ("any" requires
go1.18 or up), or more "optimistic" (force go1.21, which is the version we
currently use to build).
For completeness sake, note that any file _without_ a `//go:build` directive
will continue to use go1.16 language version when used as a module.
[1]: 58c28ba286/src/cmd/go/internal/gover/version.go (L9-L56)
[2]; https://go.dev/doc/toolchain#:~:text=The%20go%20line%20for,file%20to%20Go%201.22
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
cli/compose/schema/schema.go:20:44: unused-parameter: parameter 'input' seems to be unused, consider removing or renaming it as _ (revive)
func (checker portsFormatChecker) IsFormat(input interface{}) bool {
^
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Previously, `version: "3"` was equivalent to `version: "3.0"`, which
caused confusion for many users, as they expected it to be "3.x".
docker-compose and docker compose (v2) have adopted the compose-spec
(https://compose-spec.io), which no longer has a version field in
the compose file, and always picks the "latest" supported version.
This changes how `docker stack` interprets "major" version numbers
specified in compose-files:
When only the major version ("3") is specified, it is now equivalent
to "3.x" (latest supported v3 schema).
Compose-files that specify both major and minor version (e.g. "3.0"
or "3.1") continue to use the existing behavior; validation is down-
graded to the specified version and will produce an error if options
are used that are not supported in that schema version. This allows
users to locally verify that a composse-file does not use options
that are not supported in the intended deployment environment (for
example if the deploy environment only supports older versions of
the schema).
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
The compose spec (https://compose-spec.io) defines the version to be optional,
and implementations of the spec to check for supported attributes instead.
While this change does not switch the `docker stack` implementation to use the
compose-spec, it makes it function more similar. Previously, omitting a version
number would either produce an error (as the field was required), or switched
the handling to assume it was version 1.0 (which is deprecated).
With this change, compose files without a version number will be handled as
the latest version supported by `docker stack` (currently 3.10). This allows
users that work with docker-compose or docker compose (v2) to deploy their
compose file, without having to re-add a version number. Fields that are
not supported by stackes (schema 3.10) will still produce an error.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This allows us to drop the `//go:generate` and use of the github.com/mjibson/esc
utility.
worth noting that Go's native "embed" does not compress files. We could compress
these files as part of a build / validate step (which would add some complexity
when updating these files) if this is a concern, but not sure if the additional
complexity is warranted.
Comparing before/after sizes (see below);
macOS: 54125840 - 54005264 = 120576 (+120.58 kB)
Linux: 52393231 - 52277701 = 115530 (+115.53 kB)
Before:
ls -l build/
total 208736
lrwxr-xr-x 1 sebastiaan staff 19 Aug 15 09:36 docker@ -> docker-linux-amd64
-rwxr-xr-x 1 sebastiaan staff 54005264 Aug 15 09:35 docker-darwin-amd64*
-rwxr-xr-x 1 sebastiaan staff 52277701 Aug 15 09:36 docker-linux-amd64*
After:
ls -l build/
total 208960
lrwxr-xr-x 1 sebastiaan staff 18 Aug 15 09:32 docker@ -> docker-linux-amd64
-rwxr-xr-x 1 sebastiaan staff 54125840 Aug 15 09:31 docker-darwin-amd64*
-rwxr-xr-x 1 sebastiaan staff 52393231 Aug 15 09:32 docker-linux-amd64*
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Sebastiaan van Stijn
Laura Brehm
Silvin Lubecki
Daniel Nephin
Daniel Nephin