initial commit [ci skip]

command/compile.go

@@ -0,0 +1,122 @@
+// Copyright 2019 Drone.IO Inc. All rights reserved.
+// Use of this source code is governed by the Polyform License
+// that can be found in the LICENSE file.
+
+package command
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"github.com/drone-runners/drone-runner-docker/command/internal"
+	"github.com/drone-runners/drone-runner-docker/engine/compiler"
+	"github.com/drone-runners/drone-runner-docker/engine/resource"
+	"github.com/drone/envsubst"
+	"github.com/drone/runner-go/environ"
+	"github.com/drone/runner-go/manifest"
+	"github.com/drone/runner-go/secret"
+
+	"gopkg.in/alecthomas/kingpin.v2"
+)
+
+type compileCommand struct {
+	*internal.Flags
+
+	Source  *os.File
+	Environ map[string]string
+	Secrets map[string]string
+}
+
+func (c *compileCommand) run(*kingpin.ParseContext) error {
+	rawsource, err := ioutil.ReadAll(c.Source)
+	if err != nil {
+		return err
+	}
+
+	envs := environ.Combine(
+		c.Environ,
+		environ.System(c.System),
+		environ.Repo(c.Repo),
+		environ.Build(c.Build),
+		environ.Stage(c.Stage),
+		environ.Link(c.Repo, c.Build, c.System),
+		c.Build.Params,
+	)
+
+	// string substitution function ensures that string
+	// replacement variables are escaped and quoted if they
+	// contain newlines.
+	subf := func(k string) string {
+		v := envs[k]
+		if strings.Contains(v, "\n") {
+			v = fmt.Sprintf("%q", v)
+		}
+		return v
+	}
+
+	// evaluates string replacement expressions and returns an
+	// update configuration.
+	config, err := envsubst.Eval(string(rawsource), subf)
+	if err != nil {
+		return err
+	}
+
+	// parse and lint the configuration
+	manifest, err := manifest.ParseString(config)
+	if err != nil {
+		return err
+	}
+
+	// a configuration can contain multiple pipelines.
+	// get a specific pipeline resource for execution.
+	resource, err := resource.Lookup(c.Stage.Name, manifest)
+	if err != nil {
+		return err
+	}
+
+	// compile the pipeline to an intermediate representation.
+	comp := &compiler.Compiler{
+		Pipeline: resource,
+		Manifest: manifest,
+		Build:    c.Build,
+		Netrc:    c.Netrc,
+		Repo:     c.Repo,
+		Stage:    c.Stage,
+		System:   c.System,
+		Environ:  c.Environ,
+		Secret:   secret.StaticVars(c.Secrets),
+	}
+	spec := comp.Compile(nocontext)
+
+	// encode the pipeline in json format and print to the
+	// console for inspection.
+	enc := json.NewEncoder(os.Stdout)
+	enc.SetIndent("", "  ")
+	enc.Encode(spec)
+	return nil
+}
+
+func registerCompile(app *kingpin.Application) {
+	c := new(compileCommand)
+	c.Environ = map[string]string{}
+	c.Secrets = map[string]string{}
+
+	cmd := app.Command("compile", "compile the yaml file").
+		Action(c.run)
+
+	cmd.Flag("source", "source file location").
+		Default(".drone.yml").
+		FileVar(&c.Source)
+
+	cmd.Flag("secrets", "secret parameters").
+		StringMapVar(&c.Secrets)
+
+	cmd.Flag("environ", "environment variables").
+		StringMapVar(&c.Environ)
+
+	// shared pipeline flags
+	c.Flags = internal.ParseFlags(cmd)
+}