mirror of https://github.com/k3s-io/k3s
104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
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/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package versioned
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import (
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"bufio"
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"bytes"
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"fmt"
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"os"
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"strings"
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"unicode"
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"unicode/utf8"
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"k8s.io/apimachinery/pkg/util/validation"
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)
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var utf8bom = []byte{0xEF, 0xBB, 0xBF}
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// proccessEnvFileLine returns a blank key if the line is empty or a comment.
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// The value will be retrieved from the environment if necessary.
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func proccessEnvFileLine(line []byte, filePath string,
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currentLine int) (key, value string, err error) {
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if !utf8.Valid(line) {
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return ``, ``, fmt.Errorf("env file %s contains invalid utf8 bytes at line %d: %v",
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filePath, currentLine+1, line)
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}
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// We trim UTF8 BOM from the first line of the file but no others
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if currentLine == 0 {
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line = bytes.TrimPrefix(line, utf8bom)
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}
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// trim the line from all leading whitespace first
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line = bytes.TrimLeftFunc(line, unicode.IsSpace)
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// If the line is empty or a comment, we return a blank key/value pair.
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if len(line) == 0 || line[0] == '#' {
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return ``, ``, nil
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}
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data := strings.SplitN(string(line), "=", 2)
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key = data[0]
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if errs := validation.IsEnvVarName(key); len(errs) != 0 {
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return ``, ``, fmt.Errorf("%q is not a valid key name: %s", key, strings.Join(errs, ";"))
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}
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if len(data) == 2 {
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value = data[1]
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} else {
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// No value (no `=` in the line) is a signal to obtain the value
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// from the environment.
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value = os.Getenv(key)
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}
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return
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}
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// addFromEnvFile processes an env file allows a generic addTo to handle the
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// collection of key value pairs or returns an error.
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func addFromEnvFile(filePath string, addTo func(key, value string) error) error {
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f, err := os.Open(filePath)
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if err != nil {
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return err
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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currentLine := 0
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for scanner.Scan() {
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// Process the current line, retrieving a key/value pair if
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// possible.
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scannedBytes := scanner.Bytes()
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key, value, err := proccessEnvFileLine(scannedBytes, filePath, currentLine)
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if err != nil {
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return err
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}
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currentLine++
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if len(key) == 0 {
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// no key means line was empty or a comment
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continue
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}
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if err = addTo(key, value); err != nil {
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return err
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}
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}
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return nil
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}
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