mirror of https://github.com/docker/cli.git
78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
package opts
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"fmt"
|
|
"os"
|
|
"strings"
|
|
"unicode"
|
|
"unicode/utf8"
|
|
)
|
|
|
|
const whiteSpaces = " \t"
|
|
|
|
// ErrBadKey typed error for bad environment variable
|
|
type ErrBadKey struct {
|
|
msg string
|
|
}
|
|
|
|
func (e ErrBadKey) Error() string {
|
|
return fmt.Sprintf("poorly formatted environment: %s", e.msg)
|
|
}
|
|
|
|
func parseKeyValueFile(filename string, emptyFn func(string) (string, bool)) ([]string, error) {
|
|
fh, err := os.Open(filename)
|
|
if err != nil {
|
|
return []string{}, err
|
|
}
|
|
defer fh.Close()
|
|
|
|
lines := []string{}
|
|
scanner := bufio.NewScanner(fh)
|
|
currentLine := 0
|
|
utf8bom := []byte{0xEF, 0xBB, 0xBF}
|
|
for scanner.Scan() {
|
|
scannedBytes := scanner.Bytes()
|
|
if !utf8.Valid(scannedBytes) {
|
|
return []string{}, fmt.Errorf("env file %s contains invalid utf8 bytes at line %d: %v", filename, currentLine+1, scannedBytes)
|
|
}
|
|
// We trim UTF8 BOM
|
|
if currentLine == 0 {
|
|
scannedBytes = bytes.TrimPrefix(scannedBytes, utf8bom)
|
|
}
|
|
// trim the line from all leading whitespace first
|
|
line := strings.TrimLeftFunc(string(scannedBytes), unicode.IsSpace)
|
|
currentLine++
|
|
// line is not empty, and not starting with '#'
|
|
if len(line) > 0 && !strings.HasPrefix(line, "#") {
|
|
data := strings.SplitN(line, "=", 2)
|
|
|
|
// trim the front of a variable, but nothing else
|
|
variable := strings.TrimLeft(data[0], whiteSpaces)
|
|
if strings.ContainsAny(variable, whiteSpaces) {
|
|
return []string{}, ErrBadKey{fmt.Sprintf("variable '%s' has white spaces", variable)}
|
|
}
|
|
if len(variable) == 0 {
|
|
return []string{}, ErrBadKey{fmt.Sprintf("no variable name on line '%s'", line)}
|
|
}
|
|
|
|
if len(data) > 1 {
|
|
// pass the value through, no trimming
|
|
lines = append(lines, fmt.Sprintf("%s=%s", variable, data[1]))
|
|
} else {
|
|
var value string
|
|
var present bool
|
|
if emptyFn != nil {
|
|
value, present = emptyFn(line)
|
|
}
|
|
if present {
|
|
// if only a pass-through variable is given, clean it up.
|
|
lines = append(lines, fmt.Sprintf("%s=%s", strings.TrimSpace(line), value))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return lines, scanner.Err()
|
|
}
|