chore: vendor

vendor/github.com/docker/cli/opts/env.go

@@ -0,0 +1,31 @@
+package 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 validated, and it's up to the application inside the container
+// to validate them or not.
+//
+// The only validation here is to check if name is empty, per #25099
+func ValidateEnv(val string) (string, error) {
+	k, _, hasValue := strings.Cut(val, "=")
+	if k == "" {
+		return "", errors.New("invalid environment variable: " + val)
+	}
+	if hasValue {
+		// val contains a "=" (but value may be an empty string)
+		return val, nil
+	}
+	if envVal, ok := os.LookupEnv(k); ok {
+		return k + "=" + envVal, nil
+	}
+	return val, nil
+}