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render.go
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render.go
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package main
import (
"fmt"
"os"
"github.com/docker/app/internal"
"github.com/docker/app/internal/packager"
"github.com/docker/app/internal/renderer"
"github.com/docker/cli/cli"
"github.com/spf13/cobra"
"gopkg.in/yaml.v2"
)
var (
renderComposeFiles []string
renderSettingsFile []string
renderEnv []string
renderOutput string
)
func renderCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "render <app-name> [-s key=value...] [-f settings-file...]",
Short: "Render the Compose file for the application",
Long: `Render the Compose file for the application.`,
Args: cli.RequiresMaxArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
appname, cleanup, err := packager.Extract(firstOrEmpty(args))
if err != nil {
return err
}
defer cleanup()
d, err := parseSettings(renderEnv)
if err != nil {
return err
}
rendered, err := renderer.Render(appname, renderComposeFiles, renderSettingsFile, d)
if err != nil {
return err
}
res, err := yaml.Marshal(rendered)
if err != nil {
return err
}
if renderOutput == "-" {
fmt.Print(string(res))
} else {
f, err := os.Create(renderOutput)
if err != nil {
return err
}
fmt.Fprint(f, string(res))
}
return nil
},
}
if internal.Experimental == "on" {
cmd.Use += " [-c <compose-files>...]"
cmd.Long += `- External Compose files or template Compose files can be specified with the -c flag.
(Repeat the flag for multiple files). These files will be merged in order with
the app's own Compose file.`
cmd.Flags().StringArrayVarP(&renderComposeFiles, "compose-files", "c", []string{}, "Override Compose files")
}
cmd.Flags().StringArrayVarP(&renderSettingsFile, "settings-files", "f", []string{}, "Override settings files")
cmd.Flags().StringArrayVarP(&renderEnv, "set", "s", []string{}, "Override settings values")
cmd.Flags().StringVarP(&renderOutput, "output", "o", "-", "Output file")
return cmd
}