Merge pull request #30781 from AkihiroSuda/fix-stack-env

compose: fix environment interpolation from the client

command/stack/deploy_composefile.go

@@ -15,6 +15,7 @@ import (
 	composetypes "github.com/docker/docker/cli/compose/types"
 	apiclient "github.com/docker/docker/client"
 	dockerclient "github.com/docker/docker/client"
+	"github.com/pkg/errors"
 	"golang.org/x/net/context"
 )
 
@@ -122,9 +123,26 @@ func getConfigDetails(opts deployOptions) (composetypes.ConfigDetails, error) {
 	}
 	// TODO: support multiple files
 	details.ConfigFiles = []composetypes.ConfigFile{*configFile}
+	details.Environment, err = buildEnvironment(os.Environ())
+	if err != nil {
+		return details, err
+	}
 	return details, nil
 }
 
+func buildEnvironment(env []string) (map[string]string, error) {
+	result := make(map[string]string, len(env))
+	for _, s := range env {
+		// if value is empty, s is like "K=", not "K".
+		if !strings.Contains(s, "=") {
+			return result, errors.Errorf("unexpected environment %q", s)
+		}
+		kv := strings.SplitN(s, "=", 2)
+		result[kv[0]] = kv[1]
+	}
+	return result, nil
+}
+
 func getConfigFile(filename string) (*composetypes.ConfigFile, error) {
 	bytes, err := ioutil.ReadFile(filename)
 	if err != nil {