rootless: allow to build without cgo

unfortunately rootless won't work without cgo, as most of the
implementation is in C, but at least allow to build libpod.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

2 files changed, 11 insertions, 4 deletions

diff --git a/pkg/rootless/rootless_linux.go b/pkg/rootless/rootless_linux.go
index d51f32d68..f3b9a8fd5 100644
--- a/pkg/rootless/rootless_linux.go
+++ b/pkg/rootless/rootless_linux.go
@@ -1,4 +1,4 @@
-// +build linux
+// +build linux,cgo
 
 package rootless
 
diff --git a/pkg/rootless/rootless_unsupported.go b/pkg/rootless/rootless_unsupported.go
index 52863580e..a8485c083 100644
--- a/pkg/rootless/rootless_unsupported.go
+++ b/pkg/rootless/rootless_unsupported.go
@@ -1,14 +1,21 @@
-// +build !linux
+// +build !linux !cgo
 
 package rootless
 
 import (
+	"os"
+
 	"github.com/pkg/errors"
 )
 
-// IsRootless returns false on all non-linux platforms
+// IsRootless returns whether the user is rootless
 func IsRootless() bool {
-	return false
+	uid := os.Geteuid()
+	// os.Geteuid() on Windows returns -1
+	if uid == -1 {
+		return false
+	}
+	return uid != 0
 }
 
 // BecomeRootInUserNS re-exec podman in a new userNS.  It returns whether podman was re-executed