support --compose-file - as stdin

Signed-off-by: Marco Mariani <marco.mariani@alterway.fr>

cli/command/stack/deploy_composefile.go

@@ -5,6 +5,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"runtime"
 	"sort"
 	"strings"
 
@@ -121,11 +122,20 @@ func propertyWarnings(properties map[string]string) string {
 func getConfigDetails(composefile string) (composetypes.ConfigDetails, error) {
 	var details composetypes.ConfigDetails
 
-	absPath, err := filepath.Abs(composefile)
-	if err != nil {
-		return details, err
+	if composefile == "-" && runtime.GOOS != "windows" {
+		composefile = "/dev/stdin"
+		workingDir, err := os.Getwd()
+		if err != nil {
+			return details, err
+		}
+		details.WorkingDir = workingDir
+	} else {
+		absPath, err := filepath.Abs(composefile)
+		if err != nil {
+			return details, err
+		}
+		details.WorkingDir = filepath.Dir(absPath)
 	}
-	details.WorkingDir = filepath.Dir(absPath)
 
 	configFile, err := getConfigFile(composefile)
 	if err != nil {

docs/reference/commandline/stack_deploy.md

@@ -57,6 +57,8 @@ Creating service vossibility_ghollector
 Creating service vossibility_lookupd
 ```
 
+The Compose file can also be provided as standard input with `--compose-file -`.
+
 Only a single Compose file is accepted. If your configuration is split between
 multiple Compose files, e.g. a base configuration and environment-specific overrides,
 you can combine these by passing them to `docker-compose config` with the `-f` option