sif: limit platform to linux

Signed-off-by: Yannick Cote <ycote@redhat.com>

sif/internal/sif_util.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package internal
 
 import (

sif/sif/create.go

@@ -5,6 +5,8 @@
 // LICENSE file distributed with the sources of this project regarding your
 // rights to use or distribute this software.
 
+// +build linux
+
 package sif
 
 import (

sif/sif/init.go

@@ -5,6 +5,8 @@
 // LICENSE file distributed with the sources of this project regarding your
 // rights to use or distribute this software.
 
+// +build linux
+
 package sif
 
 import (

sif/sif/load.go

@@ -5,6 +5,8 @@
 // LICENSE file distributed with the sources of this project regarding your
 // rights to use or distribute this software.
 
+// +build linux
+
 package sif
 
 import (

sif/sif/lookup.go

@@ -5,6 +5,8 @@
 // LICENSE file distributed with the sources of this project regarding your
 // rights to use or distribute this software.
 
+// +build linux
+
 package sif
 
 import (

sif/sif/sif.go

@@ -5,6 +5,8 @@
 // LICENSE file distributed with the sources of this project regarding your
 // rights to use or distribute this software.
 
+// +build linux
+
 // Package sif implements data structures and routines to create
 // and access SIF files.
 // 	- sif.go contains the data definition the file format.
@@ -18,8 +20,9 @@ package sif
 
 import (
 	"bytes"
-	"github.com/satori/go.uuid"
 	"os"
+
+	uuid "github.com/satori/go.uuid"
 )
 
 // Layout of a SIF file (example)

sif/sif_src.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package sifimage
 
 import (

sif/sif_transport.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package sifimage
 
 import (

transports/alltransports/alltransports.go

@@ -12,9 +12,9 @@ import (
 	_ "github.com/containers/image/v5/oci/archive"
 	_ "github.com/containers/image/v5/oci/layout"
 	_ "github.com/containers/image/v5/openshift"
-	_ "github.com/containers/image/v5/sif"
 	_ "github.com/containers/image/v5/tarball"
 
+	// The sif transport is registered by sif*.go
 	// The ostree transport is registered by ostree*.go
 	// The storage transport is registered by storage*.go
 	"github.com/containers/image/v5/transports"

transports/alltransports/sif.go

@@ -0,0 +1,8 @@
+// +build linux
+
+package alltransports
+
+import (
+	// Register the sif transport
+	_ "github.com/containers/image/v5/sif"
+)

transports/alltransports/sif_stub.go

@@ -0,0 +1,9 @@
+// +build !linux
+
+package alltransports
+
+import "github.com/containers/image/v5/transports"
+
+func init() {
+	transports.Register(transports.NewStubTransport("sif"))
+}