mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-22 04:50:23 +00:00
104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
/*
|
|
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() {
|
|
// Process 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
|
|
}
|