Please don't use bash when there are syscalls available

[John Meinel]

If we do need to parse the error message, we could use the "LANG=C" trick.
But yes, I'd rather avoid it if possible.

John
=:->

On Wed, Sep 10, 2014 at 2:56 AM, Andrew Wilkins <
andrew.wilkins at canonical.com> wrote:

> On Wed, Sep 10, 2014 at 4:45 AM, Nate Finch <nate.finch at canonical.com>
> wrote:
>
>> A user just complained that he can't bootstrap because Juju is parsing
>> stderr text from flock, and his server isn't in English, so the error
>> message isn't matching.
>>
>>
>> https://github.com/juju/juju/blob/master/environs/sshstorage/storage.go#L254
>>
>> Now, I think we all know that parsing error text is a bad idea, but I
>> think I understand why it was done - it looks like flock the application
>> only returns 1 on this failure, so it's not exactly a unique error code.
>>  However, flock the system call returns several different error codes,
>> which are quite unique and easy to handle in a way that is not dependent on
>> the language of the machine.
>>
>> It also happens to be already implemented in the syscalls package:
>>
>> http://golang.org/pkg/syscall/#Flock
>>
>> So.... let's fix this, and try not to call out to bash unless there's
>> absolutely no other way.
>>
>
> This is running on a remote system before there is any code deployed. I
> won't say there's *no other way*, but you can't invoke syscalls from out of
> thin air. Finally, that error message check has nothing to do with flock.
> It's checking the result of I/O redirection to base64.
>
> Agreed that parsing the message is dumb. We can fix this with an explicit
> file existence check in the command executed ((test -e $path || echo
> blah>&2)||base64<$path) or so. In the not too distant future, we will have
> no need for sshstorage at all (except in past, supported releases).
>
> -Nate
>>
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