1 files changed, 30 insertions, 0 deletions
diff --git a/vendor/github.com/docker/docker/opts/env.go b/vendor/github.com/docker/docker/opts/env.go
new file mode 100644
index 000000000..97e1a8c8a
--- /dev/null
+++ b/vendor/github.com/docker/docker/opts/env.go
@@ -0,0 +1,30 @@
+package opts // import "github.com/docker/docker/opts"
+
+import (
+	"os"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+// ValidateEnv validates an environment variable and returns it.
+// If no value is specified, it obtains its value from the current environment
+//
+// As on ParseEnvFile and related to #16585, environment variable names
+// are not validate whatsoever, it's up to application inside docker
+// to validate them or not.
+//
+// The only validation here is to check if name is empty, per #25099
+func ValidateEnv(val string) (string, error) {
+	arr := strings.SplitN(val, "=", 2)
+	if arr[0] == "" {
+		return "", errors.New("invalid environment variable: " + val)
+	}
+	if len(arr) > 1 {
+		return val, nil
+	}
+	if envVal, ok := os.LookupEnv(arr[0]); ok {
+		return arr[0] + "=" + envVal, nil
+	}
+	return val, nil
+}