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buildctl: detect empty stdin with empty frontend 

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
docker-19.03
Tonis Tiigi 2019-02-01 11:50:54 -08:00
parent ac64f29f63
commit 8344b342a1
1 changed files with 6 additions and 0 deletions
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6
cmd/buildctl/build.go
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@ -214,10 +214,16 @@ func build(clicontext *cli.Context) error {
var def *llb.Definition
if clicontext.String("frontend") == "" {
if fi, _ := os.Stdin.Stat(); (fi.Mode() & os.ModeCharDevice) != 0 {
return errors.Errorf("please specify --frontend or pipe LLB definition to stdin")
}
def, err = read(os.Stdin, clicontext)
if err != nil {
return err
}
if len(def.Def) == 0 {
return errors.Errorf("empty definition sent to build. Specify --frontend instead?")
}
} else {
if clicontext.Bool("no-cache") {
solveOpt.FrontendAttrs["no-cache"] = ""