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Merge pull request #911 from rliebz/fix/infinite-parse

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Fix infinite loop when parsing invalid flags for apps with short option handling
This commit is contained in:
Audrius Butkevicius 2019-10-12 18:55:02 +02:00 committed by GitHub
commit a221e662f1
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 21 additions and 9 deletions
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5
command_test.go
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@ -70,8 +70,13 @@ func TestParseAndRunShortOpts(t *testing.T) {
{[]string{"foo", "test", "-af"}, nil, []string{}},
{[]string{"foo", "test", "-cf"}, nil, []string{}},
{[]string{"foo", "test", "-acf"}, nil, []string{}},
{[]string{"foo", "test", "--acf"}, errors.New("flag provided but not defined: -acf"), nil},
{[]string{"foo", "test", "-invalid"}, errors.New("flag provided but not defined: -invalid"), nil},
{[]string{"foo", "test", "-acf", "-invalid"}, errors.New("flag provided but not defined: -invalid"), nil},
{[]string{"foo", "test", "--invalid"}, errors.New("flag provided but not defined: -invalid"), nil},
{[]string{"foo", "test", "-acf", "--invalid"}, errors.New("flag provided but not defined: -invalid"), nil},
{[]string{"foo", "test", "-acf", "arg1", "-invalid"}, nil, []string{"arg1", "-invalid"}},
{[]string{"foo", "test", "-acf", "arg1", "--invalid"}, nil, []string{"arg1", "--invalid"}},
{[]string{"foo", "test", "-acfi", "not-arg", "arg1", "-invalid"}, nil, []string{"arg1", "-invalid"}},
{[]string{"foo", "test", "-i", "ivalue"}, nil, []string{}},
{[]string{"foo", "test", "-i", "ivalue", "arg1"}, nil, []string{"arg1"}},

25
parse.go
View File

@ -22,28 +22,35 @@ func parseIter(set *flag.FlagSet, ip iterativeParser, args []string) error {
}
errStr := err.Error()
trimmed := strings.TrimPrefix(errStr, "flag provided but not defined: ")
trimmed := strings.TrimPrefix(errStr, "flag provided but not defined: -")
if errStr == trimmed {
return err
}
// regenerate the initial args with the split short opts
newArgs := []string{}
argsWereSplit := false
for i, arg := range args {
if arg != trimmed {
newArgs = append(newArgs, arg)
// skip args that are not part of the error message
if name := strings.TrimLeft(arg, "-"); name != trimmed {
continue
}
shortOpts := splitShortOptions(set, trimmed)
// if we can't split, the error was accurate
shortOpts := splitShortOptions(set, arg)
if len(shortOpts) == 1 {
return err
}
// add each short option and all remaining arguments
newArgs = append(newArgs, shortOpts...)
newArgs = append(newArgs, args[i+1:]...)
args = newArgs
// swap current argument with the split version
args = append(args[:i], append(shortOpts, args[i+1:]...)...)
argsWereSplit = true
break
}
// This should be an impossible to reach code path, but in case the arg
// splitting failed to happen, this will prevent infinite loops
if !argsWereSplit {
return err
}
// Since custom parsing failed, replace the flag set before retrying