78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
/*
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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 kubectl
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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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// 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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utf8bom := []byte{0xEF, 0xBB, 0xBF}
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for scanner.Scan() {
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scannedBytes := scanner.Bytes()
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if !utf8.Valid(scannedBytes) {
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return fmt.Errorf("env file %s contains invalid utf8 bytes at line %d: %v", filePath, currentLine+1, scannedBytes)
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}
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// We trim UTF8 BOM
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if currentLine == 0 {
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scannedBytes = bytes.TrimPrefix(scannedBytes, utf8bom)
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}
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// trim the line from all leading whitespace first
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line := strings.TrimLeftFunc(string(scannedBytes), unicode.IsSpace)
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currentLine++
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// line is not empty, and not starting with '#'
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if len(line) > 0 && !strings.HasPrefix(line, "#") {
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data := strings.SplitN(line, "=", 2)
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key := data[0]
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if errs := validation.IsCIdentifier(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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value := ""
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if len(data) > 1 {
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// pass the value through, no trimming
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value = data[1]
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} else {
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// a pass-through variable is given
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value = os.Getenv(key)
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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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}
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return nil
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}
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