feat: add COMPOSE_FILE env variable

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

cmd/root.go

@@ -21,6 +21,8 @@ import (
 
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
 )
 
 // Logrus hooks
@@ -80,6 +82,16 @@ var RootCmd = &cobra.Command{
 		if provider != "kubernetes" && provider != "openshift" {
 			log.Fatalf("%s is an unsupported provider. Supported providers are: 'kubernetes', 'openshift'.", GlobalProvider)
 		}
+
+		v := viper.New()
+		v.BindEnv("file", "COMPOSE_FILE")
+
+		cmd.Flags().VisitAll(func(f *pflag.Flag) {
+			configName := f.Name
+			if configName == "file" && !f.Changed && v.IsSet(configName) {
+				GlobalFiles = v.GetStringSlice(configName)
+			}
+		})
 	},
 }
 
@@ -93,6 +105,6 @@ func init() {
 	RootCmd.PersistentFlags().BoolVarP(&GlobalVerbose, "verbose", "v", false, "verbose output")
 	RootCmd.PersistentFlags().BoolVar(&GlobalSuppressWarnings, "suppress-warnings", false, "Suppress all warnings")
 	RootCmd.PersistentFlags().BoolVar(&GlobalErrorOnWarning, "error-on-warning", false, "Treat any warning as an error")
-	RootCmd.PersistentFlags().StringArrayVarP(&GlobalFiles, "file", "f", []string{}, "Specify an alternative compose file")
+	RootCmd.PersistentFlags().StringSliceVarP(&GlobalFiles, "file", "f", []string{}, "Specify an alternative compose file")
 	RootCmd.PersistentFlags().StringVar(&GlobalProvider, "provider", "kubernetes", "Specify a provider. Kubernetes or OpenShift.")
 }

script/test/cmd/tests_new.sh

@@ -310,3 +310,7 @@ convert::expect_success "$os_cmd" "$os_output" || exit 1
 cmd="kompose -f $KOMPOSE_ROOT/script/test/fixtures/no-profile-warning/docker-compose.yaml convert"
 convert::expect_warning "$cmd" "No service selected. The profile specified in services of your compose yaml may not exist." || exit 1
 
+# Test COMPOSE_FILE env variable is honored
+k8s_cmd="COMPOSE_FILE=\"$KOMPOSE_ROOT/script/test/fixtures/compose-file-env-variable/docker-compose.yaml $KOMPOSE_ROOT/script/test/fixtures/compose-file-env-variable/alternative-docker-compose.yaml\" kompose convert --stdout --with-kompose-annotation=false"
+k8s_output="$KOMPOSE_ROOT/script/test/fixtures/fixtures/compose-file-env-variable/output-k8s.yaml"
+convert::expect_success "$k8s_cmd" "$k8s_output" || exit 1

script/test/fixtures/compose-file-env-variable/alternative-docker-compose.yaml

@@ -0,0 +1,7 @@
+version: "3"
+services:
+  alpine:
+    image: alpine
+    ports:
+      - 80:80
+

script/test/fixtures/compose-file-env-variable/docker-compose.yaml

@@ -0,0 +1,6 @@
+version: "3"
+services:
+  debian:
+    image: debian
+    ports:
+      - 80:80

script/test/fixtures/compose-file-env-variable/output-k8s.yaml

@@ -0,0 +1,94 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  creationTimestamp: null
+  labels:
+    io.kompose.service: alpine
+  name: alpine
+spec:
+  ports:
+    - name: "80"
+      port: 80
+      targetPort: 80
+  selector:
+    io.kompose.service: alpine
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  creationTimestamp: null
+  labels:
+    io.kompose.service: debian
+  name: debian
+spec:
+  ports:
+    - name: "80"
+      port: 80
+      targetPort: 80
+  selector:
+    io.kompose.service: debian
+
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  creationTimestamp: null
+  labels:
+    io.kompose.service: alpine
+  name: alpine
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      io.kompose.service: alpine
+  strategy: {}
+  template:
+    metadata:
+      creationTimestamp: null
+      labels:
+        io.kompose.network/compose-file-env-variable-default: "true"
+        io.kompose.service: alpine
+    spec:
+      containers:
+        - image: alpine
+          name: alpine
+          ports:
+            - containerPort: 80
+              hostPort: 80
+              protocol: TCP
+          resources: {}
+      restartPolicy: Always
+
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  creationTimestamp: null
+  labels:
+    io.kompose.service: debian
+  name: debian
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      io.kompose.service: debian
+  strategy: {}
+  template:
+    metadata:
+      creationTimestamp: null
+      labels:
+        io.kompose.network/compose-file-env-variable-default: "true"
+        io.kompose.service: debian
+    spec:
+      containers:
+        - image: debian
+          name: debian
+          ports:
+            - containerPort: 80
+              hostPort: 80
+              protocol: TCP
+          resources: {}
+      restartPolicy: Always
+