mirror of https://github.com/docker/cli.git
71 lines
1.9 KiB
Go
71 lines
1.9 KiB
Go
package opts
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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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)
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const whiteSpaces = " \t"
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func parseKeyValueFile(filename string, lookupFn func(string) (string, bool)) ([]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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utf8bom := []byte{0xEF, 0xBB, 0xBF}
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for currentLine := 1; scanner.Scan(); currentLine++ {
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scannedBytes := scanner.Bytes()
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if !utf8.Valid(scannedBytes) {
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return []string{}, fmt.Errorf("env file %s contains invalid utf8 bytes at line %d: %v", filename, currentLine, scannedBytes)
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}
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// We trim UTF8 BOM
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if currentLine == 1 {
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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. trailing whitespace
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// is part of the value, and is kept unmodified.
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line := strings.TrimLeftFunc(string(scannedBytes), unicode.IsSpace)
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if len(line) == 0 || line[0] == '#' {
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// skip empty lines and comments (lines starting with '#')
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continue
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}
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key, _, hasValue := strings.Cut(line, "=")
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if len(key) == 0 {
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return []string{}, fmt.Errorf("no variable name on line '%s'", line)
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}
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// leading whitespace was already removed from the line, but
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// variables are not allowed to contain whitespace or have
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// trailing whitespace.
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if strings.ContainsAny(key, whiteSpaces) {
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return []string{}, fmt.Errorf("variable '%s' contains whitespaces", key)
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}
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if hasValue {
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// key/value pair is valid and has a value; add the line as-is.
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lines = append(lines, line)
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continue
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}
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if lookupFn != nil {
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// No value given; try to look up the value. The value may be
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// empty but if no value is found, the key is omitted.
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if value, found := lookupFn(line); found {
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lines = append(lines, key+"="+value)
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}
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}
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}
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return lines, scanner.Err()
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}
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