commit 4a7b04d412 configured golangci-lint
to use go1.23 semantics, which enabled the copyloopvar linter.
go1.22 now creates a copy of variables when assigned in a loop; make sure we
don't have files that may downgrade semantics to go1.21 in case that also means
disabling that feature; https://go.dev/ref/spec#Go_1.22
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 7c80e4f938)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
With this patch, completion is provided for `--platform` flags:
docker pull --platform<TAB>
linux linux/amd64 linux/arm/v5 linux/arm/v7 linux/arm64/v8 linux/riscv64 wasip1 windows
linux/386 linux/arm linux/arm/v6 linux/arm64 linux/ppc64le linux/s390x wasip1/wasm windows/amd64
Note that `docker buildx build` (with BuildKit) does not yet provide completion;
it's provided through buildx, and uses a different format (accepting multiple
comma-separated platforms). Interestingly, tab-completion for `docker build`
currently uses completion for non-buildkit, and has some other issues that may
have to be looked into.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit d42cf96e15)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Blue text with underline looks too much as a hyperlink I can click on
Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>
(cherry picked from commit 17040890e4)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Don't output the extra spacing around the images when none of the
top-level image entries has any children.
This makes the list look better when ran against the graphdrivers image
store.
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
(cherry picked from commit 7b91647943)
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
This makes a quick pass through our tests;
Discard output/err
----------------------------------------------
Many tests were testing for error-conditions, but didn't discard output.
This produced a lot of noise when running the tests, and made it hard
to discover if there were actual failures, or if the output was expected.
For example:
=== RUN TestConfigCreateErrors
Error: "create" requires exactly 2 arguments.
See 'create --help'.
Usage: create [OPTIONS] CONFIG file|- [flags]
Create a config from a file or STDIN
Error: "create" requires exactly 2 arguments.
See 'create --help'.
Usage: create [OPTIONS] CONFIG file|- [flags]
Create a config from a file or STDIN
Error: error creating config
--- PASS: TestConfigCreateErrors (0.00s)
And after discarding output:
=== RUN TestConfigCreateErrors
--- PASS: TestConfigCreateErrors (0.00s)
Use sub-tests where possible
----------------------------------------------
Some tests were already set-up to use test-tables, and even had a usable
name (or in some cases "error" to check for). Change them to actual sub-
tests. Same test as above, but now with sub-tests and output discarded:
=== RUN TestConfigCreateErrors
=== RUN TestConfigCreateErrors/requires_exactly_2_arguments
=== RUN TestConfigCreateErrors/requires_exactly_2_arguments#01
=== RUN TestConfigCreateErrors/error_creating_config
--- PASS: TestConfigCreateErrors (0.00s)
--- PASS: TestConfigCreateErrors/requires_exactly_2_arguments (0.00s)
--- PASS: TestConfigCreateErrors/requires_exactly_2_arguments#01 (0.00s)
--- PASS: TestConfigCreateErrors/error_creating_config (0.00s)
PASS
It's not perfect in all cases (in the above, there's duplicate "expected"
errors, but Go conveniently adds "#01" for the duplicate). There's probably
also various tests I missed that could still use the same changes applied;
we can improve these in follow-ups.
Set cmd.Args to prevent test-failures
----------------------------------------------
When running tests from my IDE, it compiles the tests before running,
then executes the compiled binary to run the tests. Cobra doesn't like
that, because in that situation `os.Args` is taken as argument for the
command that's executed. The command that's tested now sees the test-
flags as arguments (`-test.v -test.run ..`), which causes various tests
to fail ("Command XYZ does not accept arguments").
# compile the tests:
go test -c -o foo.test
# execute the test:
./foo.test -test.v -test.run TestFoo
=== RUN TestFoo
Error: "foo" accepts no arguments.
The Cobra maintainers ran into the same situation, and for their own
use have added a special case to ignore `os.Args` in these cases;
https://github.com/spf13/cobra/blob/v1.8.1/command.go#L1078-L1083
args := c.args
// Workaround FAIL with "go test -v" or "cobra.test -test.v", see #155
if c.args == nil && filepath.Base(os.Args[0]) != "cobra.test" {
args = os.Args[1:]
}
Unfortunately, that exception is too specific (only checks for `cobra.test`),
so doesn't automatically fix the issue for other test-binaries. They did
provide a `cmd.SetArgs()` utility for this purpose
https://github.com/spf13/cobra/blob/v1.8.1/command.go#L276-L280
// SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden
// particularly useful when testing.
func (c *Command) SetArgs(a []string) {
c.args = a
}
And the fix is to explicitly set the command's args to an empty slice to
prevent Cobra from falling back to using `os.Args[1:]` as arguments.
cmd := newSomeThingCommand()
cmd.SetArgs([]string{})
Some tests already take this issue into account, and I updated some tests
for this, but there's likely many other ones that can use the same treatment.
Perhaps the Cobra maintainers would accept a contribution to make their
condition less specific and to look for binaries ending with a `.test`
suffix (which is what compiled binaries usually are named as).
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit ab230240ad)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Move common flag descriptions to the buildx build reference, and make
that page the canonical page in docs. Also rewrite some content in
image_build to make clear that this page is only for the legacy builder.
Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>
(cherry picked from commit e91f0ded9c)
Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>
Before this:
make shell
make -C ./internal/gocompat/
...
GO111MODULE=on go test -v
# github.com/docker/cli/cli/command/image
../../cli/command/image/push.go:177:62: predeclared any requires go1.18 or later (-lang was set to go1.16; check go.mod)
FAIL gocompat [build failed]
make: *** [Makefile:3: verify] Error 1
make: Leaving directory '/go/src/github.com/docker/cli/internal/gocompat'
After this patch:
make shell
make -C ./internal/gocompat/
...
GO111MODULE=on go test -v
=== RUN TestModuleCompatibllity
main_test.go:133: all packages have the correct go version specified through //go:build
--- PASS: TestModuleCompatibllity (0.00s)
PASS
ok gocompat 0.007s
make: Leaving directory '/go/src/github.com/docker/cli/internal/gocompat'
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This wraps the cli stderr stream the same way as stdin and stdout, which
extends the stream with TTY-related methods.
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
Looks like it's broken, so use a blanket "nolint:gosec" instead;
cli/command/image/build/context.go:238:17: G107: Potential HTTP request made with variable url (gosec)
if resp, err = http.Get(url); err != nil {
^
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
cli/registry/client/endpoint.go:128:34: fmt.Sprintf can be replaced with string concatenation (perfsprint)
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", th.token))
^
cli/command/telemetry_docker.go:88:14: fmt.Sprintf can be replaced with string concatenation (perfsprint)
endpoint = fmt.Sprintf("unix://%s", path.Join(u.Host, u.Path))
^
cli/command/cli_test.go:195:47: fmt.Sprintf can be replaced with string concatenation (perfsprint)
opts := &flags.ClientOptions{Hosts: []string{fmt.Sprintf("unix://%s", socket)}}
^
cli/command/registry_test.go:59:24: fmt.Sprintf can be replaced with string concatenation (perfsprint)
inputServerAddress: fmt.Sprintf("https://%s", testAuthConfigs[1].ServerAddress),
^
cli/command/container/opts_test.go:338:35: fmt.Sprintf can be replaced with string concatenation (perfsprint)
if config, _, _ := mustParse(t, fmt.Sprintf("--hostname=%s", hostname)); config.Hostname != expectedHostname {
^
cli/command/context/options.go:79:24: fmt.Sprintf can be replaced with string concatenation (perfsprint)
errs = append(errs, fmt.Sprintf("%s: unrecognized config key", k))
^
cli/command/image/build.go:461:68: fmt.Sprintf can be replaced with string concatenation (perfsprint)
line = dockerfileFromLinePattern.ReplaceAllLiteralString(line, fmt.Sprintf("FROM %s", reference.FamiliarString(trustedRef)))
^
cli/command/image/remove_test.go:21:9: fmt.Sprintf can be replaced with string concatenation (perfsprint)
return fmt.Sprintf("Error: No such image: %s", n.imageID)
^
cli/command/image/build/context.go:229:102: fmt.Sprintf can be replaced with string concatenation (perfsprint)
progReader := progress.NewProgressReader(response.Body, progressOutput, response.ContentLength, "", fmt.Sprintf("Downloading build context from remote url: %s", remoteURL))
^
cli/command/service/logs.go:215:16: fmt.Sprintf can be replaced with string concatenation (perfsprint)
taskName += fmt.Sprintf(".%s", task.ID)
^
cli/command/service/logs.go:217:16: fmt.Sprintf can be replaced with string concatenation (perfsprint)
taskName += fmt.Sprintf(".%s", stringid.TruncateID(task.ID))
^
cli/command/service/progress/progress_test.go:877:18: fmt.Sprintf can be replaced with string concatenation (perfsprint)
ID: fmt.Sprintf("task%s", nodeID),
^
cli/command/stack/swarm/remove.go:61:24: fmt.Sprintf can be replaced with string concatenation (perfsprint)
errs = append(errs, fmt.Sprintf("Failed to remove some resources from stack: %s", namespace))
^
cli/command/swarm/ipnet_slice_test.go:32:9: fmt.Sprintf can be replaced with string concatenation (perfsprint)
arg := fmt.Sprintf("--cidrs=%s", strings.Join(vals, ","))
^
cli/command/swarm/ipnet_slice_test.go:137:30: fmt.Sprintf can be replaced with string concatenation (perfsprint)
if err := f.Parse([]string{fmt.Sprintf("--cidrs=%s", strings.Join(test.FlagArg, ","))}); err != nil {
^
cli/compose/schema/schema.go:105:11: fmt.Sprintf can be replaced with string concatenation (perfsprint)
return fmt.Sprintf("must be a %s", humanReadableType(expectedType))
^
cli/manifest/store/store.go:165:9: fmt.Sprintf can be replaced with string concatenation (perfsprint)
return fmt.Sprintf("No such manifest: %s", n.object)
^
e2e/image/push_test.go:340:4: fmt.Sprintf can be replaced with string concatenation (perfsprint)
fmt.Sprintf("NOTARY_ROOT_PASSPHRASE=%s", pwd),
^
e2e/image/push_test.go:341:4: fmt.Sprintf can be replaced with string concatenation (perfsprint)
fmt.Sprintf("NOTARY_TARGETS_PASSPHRASE=%s", pwd),
^
e2e/image/push_test.go:342:4: fmt.Sprintf can be replaced with string concatenation (perfsprint)
fmt.Sprintf("NOTARY_SNAPSHOT_PASSPHRASE=%s", pwd),
^
e2e/image/push_test.go:343:4: fmt.Sprintf can be replaced with string concatenation (perfsprint)
fmt.Sprintf("NOTARY_DELEGATION_PASSPHRASE=%s", pwd),
^
e2e/plugin/trust_test.go:23:16: fmt.Sprintf can be replaced with string concatenation (perfsprint)
pluginName := fmt.Sprintf("%s/plugin-content-trust", registryPrefix)
^
e2e/plugin/trust_test.go:53:8: fmt.Sprintf can be replaced with string concatenation (perfsprint)
Out: fmt.Sprintf("Installed plugin %s", pluginName),
^
e2e/trust/revoke_test.go:62:57: fmt.Sprintf can be replaced with string concatenation (perfsprint)
icmd.RunCommand("docker", "tag", fixtures.AlpineImage, fmt.Sprintf("%s:v1", revokeRepo)).Assert(t, icmd.Success)
^
e2e/trust/revoke_test.go:64:49: fmt.Sprintf can be replaced with string concatenation (perfsprint)
icmd.Command("docker", "-D", "trust", "sign", fmt.Sprintf("%s:v1", revokeRepo)),
^
e2e/trust/revoke_test.go:68:58: fmt.Sprintf can be replaced with string concatenation (perfsprint)
icmd.RunCommand("docker", "tag", fixtures.BusyboxImage, fmt.Sprintf("%s:v2", revokeRepo)).Assert(t, icmd.Success)
^
e2e/trust/revoke_test.go:70:49: fmt.Sprintf can be replaced with string concatenation (perfsprint)
icmd.Command("docker", "-D", "trust", "sign", fmt.Sprintf("%s:v2", revokeRepo)),
^
e2e/trust/sign_test.go:36:47: fmt.Sprintf can be replaced with string concatenation (perfsprint)
assert.Check(t, is.Contains(result.Stdout(), fmt.Sprintf("v1: digest: sha256:%s", fixtures.AlpineSha)))
^
e2e/trust/sign_test.go:53:47: fmt.Sprintf can be replaced with string concatenation (perfsprint)
assert.Check(t, is.Contains(result.Stdout(), fmt.Sprintf("v1: digest: sha256:%s", fixtures.BusyboxSha)))
^
e2e/trust/sign_test.go:65:47: fmt.Sprintf can be replaced with string concatenation (perfsprint)
assert.Check(t, is.Contains(result.Stdout(), fmt.Sprintf("v1: digest: sha256:%s", fixtures.AlpineSha)))
^
opts/file.go:21:9: fmt.Sprintf can be replaced with string concatenation (perfsprint)
return fmt.Sprintf("poorly formatted environment: %s", e.msg)
^
opts/hosts_test.go:26:31: fmt.Sprintf can be replaced with string concatenation (perfsprint)
"tcp://host:": fmt.Sprintf("tcp://host:%s", defaultHTTPPort),
^
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
internal/test/cli.go:175:14: fmt.Errorf can be replaced with errors.New (perfsprint)
return nil, fmt.Errorf("no notary client available unless defined")
^
cli/command/cli.go:318:29: fmt.Errorf can be replaced with errors.New (perfsprint)
return docker.Endpoint{}, fmt.Errorf("no context store initialized")
^
cli/command/container/attach.go:161:11: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf(result.Error.Message)
^
cli/command/container/opts.go:577:16: fmt.Errorf can be replaced with errors.New (perfsprint)
return nil, fmt.Errorf("--health-start-period cannot be negative")
^
cli/command/container/opts.go:580:16: fmt.Errorf can be replaced with errors.New (perfsprint)
return nil, fmt.Errorf("--health-start-interval cannot be negative")
^
cli/command/container/stats.go:221:11: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("filtering is not supported when specifying a list of containers")
^
cli/command/container/attach_test.go:82:17: fmt.Errorf can be replaced with errors.New (perfsprint)
expectedErr = fmt.Errorf("unexpected error")
^
cli/command/container/create_test.go:234:40: fmt.Errorf can be replaced with errors.New (perfsprint)
return container.CreateResponse{}, fmt.Errorf("shouldn't try to pull image")
^
cli/command/container/list_test.go:150:17: fmt.Errorf can be replaced with errors.New (perfsprint)
return nil, fmt.Errorf("error listing containers")
^
cli/command/container/rm_test.go:40:31: fmt.Errorf can be replaced with errors.New (perfsprint)
return errdefs.NotFound(fmt.Errorf("Error: no such container: " + container))
^
cli/command/container/run_test.go:138:40: fmt.Errorf can be replaced with errors.New (perfsprint)
return container.CreateResponse{}, fmt.Errorf("shouldn't try to pull image")
^
cli/command/image/pull_test.go:115:49: fmt.Errorf can be replaced with errors.New (perfsprint)
return io.NopCloser(strings.NewReader("")), fmt.Errorf("shouldn't try to pull image")
^
cli/command/network/connect.go:88:16: fmt.Errorf can be replaced with errors.New (perfsprint)
return nil, fmt.Errorf("invalid key/value pair format in driver options")
^
cli/command/plugin/create_test.go:96:11: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("Error creating plugin")
^
cli/command/plugin/disable_test.go:32:12: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("Error disabling plugin")
^
cli/command/plugin/enable_test.go:32:12: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("failed to enable plugin")
^
cli/command/plugin/inspect_test.go:55:22: fmt.Errorf can be replaced with errors.New (perfsprint)
return nil, nil, fmt.Errorf("error inspecting plugin")
^
cli/command/plugin/install_test.go:43:17: fmt.Errorf can be replaced with errors.New (perfsprint)
return nil, fmt.Errorf("Error installing plugin")
^
cli/command/plugin/install_test.go:51:17: fmt.Errorf can be replaced with errors.New (perfsprint)
return nil, fmt.Errorf("(image) when fetching")
^
cli/command/plugin/install_test.go:95:17: fmt.Errorf can be replaced with errors.New (perfsprint)
return nil, fmt.Errorf("should not try to install plugin")
^
cli/command/plugin/list_test.go:35:41: fmt.Errorf can be replaced with errors.New (perfsprint)
return types.PluginsListResponse{}, fmt.Errorf("error listing plugins")
^
cli/command/plugin/remove_test.go:27:12: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("Error removing plugin")
^
cli/command/registry/login_test.go:36:46: fmt.Errorf can be replaced with errors.New (perfsprint)
return registrytypes.AuthenticateOKBody{}, fmt.Errorf("Invalid Username or Password")
^
cli/command/registry/login_test.go:44:46: fmt.Errorf can be replaced with errors.New (perfsprint)
return registrytypes.AuthenticateOKBody{}, fmt.Errorf(errUnknownUser)
^
cli/command/system/info.go:190:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("errors pretty printing info")
^
cli/command/system/prune.go:77:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf(`ERROR: The "until" filter is not supported with "--volumes"`)
^
cli/command/system/version_test.go:19:28: fmt.Errorf can be replaced with errors.New (perfsprint)
return types.Version{}, fmt.Errorf("no server")
^
cli/command/trust/key_load.go:112:22: fmt.Errorf can be replaced with errors.New (perfsprint)
return []byte{}, fmt.Errorf("could not decrypt key")
^
cli/command/trust/revoke.go:44:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("cannot use a digest reference for IMAGE:TAG")
^
cli/command/trust/revoke.go:105:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("no signed tags to remove")
^
cli/command/trust/signer_add.go:56:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("releases is a reserved keyword, please use a different signer name")
^
cli/command/trust/signer_add.go:60:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("path to a public key must be provided using the `--key` flag")
^
opts/config.go:71:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("source is required")
^
opts/mount.go:168:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("type is required")
^
opts/mount.go:172:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("target is required")
^
opts/network.go:90:11: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("network name/id is not specified")
^
opts/network.go:129:18: fmt.Errorf can be replaced with errors.New (perfsprint)
return "", "", fmt.Errorf("invalid key value pair format in driver options")
^
opts/opts.go:404:13: fmt.Errorf can be replaced with errors.New (perfsprint)
return 0, fmt.Errorf("value is too precise")
^
opts/opts.go:412:18: fmt.Errorf can be replaced with errors.New (perfsprint)
return "", "", fmt.Errorf("empty string specified for links")
^
opts/parse.go:84:37: fmt.Errorf can be replaced with errors.New (perfsprint)
return container.RestartPolicy{}, fmt.Errorf("invalid restart policy format: no policy provided before colon")
^
opts/parse.go:89:38: fmt.Errorf can be replaced with errors.New (perfsprint)
return container.RestartPolicy{}, fmt.Errorf("invalid restart policy format: maximum retry count must be an integer")
^
opts/port.go:105:13: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("hostip is not supported")
^
opts/secret.go:70:10: fmt.Errorf can be replaced with errors.New (perfsprint)
return fmt.Errorf("source is required")
^
opts/env_test.go:57:11: fmt.Errorf can be replaced with errors.New (perfsprint)
err: fmt.Errorf("invalid environment variable: =a"),
^
opts/env_test.go:93:11: fmt.Errorf can be replaced with errors.New (perfsprint)
err: fmt.Errorf("invalid environment variable: ="),
^
cli-plugins/manager/error_test.go:16:11: fmt.Errorf can be replaced with errors.New (perfsprint)
inner := fmt.Errorf("testing")
^
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
The `docker images` top-level subcommand predates the `docker <object> <verb>`
convention (e.g. `docker image ls`), but accepts a positional argument to
search/filter images by name (globbing). It's common for users to accidentally
mistake these commands, and to use (e.g.) `docker images ls`, expecting
to see all images, but ending up with an empty list because no image named
"ls" was found.
Disallowing these search-terms would be a breaking change, but we can print
and informational message to help the users correct their mistake.
Before this patch:
docker images ls
REPOSITORY TAG IMAGE ID CREATED SIZE
With this patch applied:
docker images ls
REPOSITORY TAG IMAGE ID CREATED SIZE
No images found matching "ls": did you mean "docker image ls"?
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
commit 9e1f8d646e changed this to a
"nolint" comment due to a regression in GoSec. That regression was
fixed, so we can go back to use the more fine-grained "nosec" comment.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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>
