[libvirt] [PATCH 1/4] Add APIs for formatting systemd slice/scope names
Eric Blake
eblake at redhat.com
Tue Jul 30 18:56:42 UTC 2013
On 07/30/2013 12:47 PM, Daniel P. Berrange wrote:
> On Tue, Jul 30, 2013 at 12:05:51PM -0600, Eric Blake wrote:
>> On 07/26/2013 09:48 AM, Daniel P. Berrange wrote:
>>> From: "Daniel P. Berrange" <berrange at redhat.com>
>>>
>>> There are some interesting escaping rules to consider when dealing
>>> with systemd slice/scope names. Thus it is helpful to have APIs
>>> for formatting names
>>>
>>> Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
>>> ---
>>> src/libvirt_private.syms | 2 ++
>>> src/util/virsystemd.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++--
>>> src/util/virsystemd.h | 5 +++
>>> tests/virsystemdtest.c | 48 +++++++++++++++++++++++++
>>> 4 files changed, 144 insertions(+), 2 deletions(-)
>>>
>>
>>> +
>>> +#define VALID_CHARS \
>>> + "0123456789" \
>>> + "abcdefghijklmnopqrstuvwxyz" \
>>> + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
>>> + ":-_.\\"
>>
>> If you would remove - and \\ from this list...
>
> This is the set that systemd uses, and we need to match it
> exactly, otherwise we won't detect the cgroups correctly.
My point is that your only use of VALID_CHARS was in the strchr() to see
which characters need escaping. systemd is using the full set for
characters present _after_ escaping, whereas you are only using it
_before_ escaping, and have to special-case your escaping as a result.
But I'm not too concerned about the efficiency to insist on that
micro-optimization.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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