500c8ba4b6
trim the front of variables. Error if there are other spaces present. Leave the value alone. Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
package opts
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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)
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/*
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Read in a line delimited file with environment variables enumerated
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*/
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func ParseEnvFile(filename string) ([]string, error) {
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fh, err := os.Open(filename)
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if err != nil {
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return []string{}, err
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}
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defer fh.Close()
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lines := []string{}
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scanner := bufio.NewScanner(fh)
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for scanner.Scan() {
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line := scanner.Text()
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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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if strings.Contains(line, "=") {
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data := strings.SplitN(line, "=", 2)
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// trim the front of a variable, but nothing else
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variable := strings.TrimLeft(data[0], whiteSpaces)
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if strings.ContainsAny(variable, whiteSpaces) {
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return []string{}, ErrBadEnvVariable{fmt.Sprintf("variable '%s' has white spaces", variable)}
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}
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// pass the value through, no trimming
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lines = append(lines, fmt.Sprintf("%s=%s", variable, data[1]))
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} else {
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// if only a pass-through variable is given, clean it up.
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lines = append(lines, fmt.Sprintf("%s=%s", strings.TrimSpace(line), os.Getenv(line)))
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}
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}
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}
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return lines, nil
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}
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var whiteSpaces = " \t"
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type ErrBadEnvVariable struct {
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msg string
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}
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func (e ErrBadEnvVariable) Error() string {
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return fmt.Sprintf("poorly formatted environment: %s", e.msg)
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}
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