vendor files

vendor/k8s.io/kubernetes/pkg/kubectl/env_file.go

@@ -0,0 +1,103 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kubectl
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+
+	"k8s.io/apimachinery/pkg/util/validation"
+)
+
+var utf8bom = []byte{0xEF, 0xBB, 0xBF}
+
+// proccessEnvFileLine returns a blank key if the line is empty or a comment.
+// The value will be retrieved from the environment if necessary.
+func proccessEnvFileLine(line []byte, filePath string,
+	currentLine int) (key, value string, err error) {
+
+	if !utf8.Valid(line) {
+		return ``, ``, fmt.Errorf("env file %s contains invalid utf8 bytes at line %d: %v",
+			filePath, currentLine+1, line)
+	}
+
+	// We trim UTF8 BOM from the first line of the file but no others
+	if currentLine == 0 {
+		line = bytes.TrimPrefix(line, utf8bom)
+	}
+
+	// trim the line from all leading whitespace first
+	line = bytes.TrimLeftFunc(line, unicode.IsSpace)
+
+	// If the line is empty or a comment, we return a blank key/value pair.
+	if len(line) == 0 || line[0] == '#' {
+		return ``, ``, nil
+	}
+
+	data := strings.SplitN(string(line), "=", 2)
+	key = data[0]
+	if errs := validation.IsEnvVarName(key); len(errs) != 0 {
+		return ``, ``, fmt.Errorf("%q is not a valid key name: %s", key, strings.Join(errs, ";"))
+	}
+
+	if len(data) == 2 {
+		value = data[1]
+	} else {
+		// No value (no `=` in the line) is a signal to obtain the value
+		// from the environment.
+		value = os.Getenv(key)
+	}
+	return
+}
+
+// addFromEnvFile processes an env file allows a generic addTo to handle the
+// collection of key value pairs or returns an error.
+func addFromEnvFile(filePath string, addTo func(key, value string) error) error {
+	f, err := os.Open(filePath)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	scanner := bufio.NewScanner(f)
+	currentLine := 0
+	for scanner.Scan() {
+		// Proccess the current line, retrieving a key/value pair if
+		// possible.
+		scannedBytes := scanner.Bytes()
+		key, value, err := proccessEnvFileLine(scannedBytes, filePath, currentLine)
+		if err != nil {
+			return err
+		}
+		currentLine++
+
+		if len(key) == 0 {
+			// no key means line was empty or a comment
+			continue
+		}
+
+		if err = addTo(key, value); err != nil {
+			return err
+		}
+	}
+	return nil
+}