[Kimchi-devel] [project-kimchi][PATCH 1/3] utils: Add a helper function to parse cmd result

[Royce Lv]

On 2013年12月18日 14:40, Sheldon wrote:
> Reviewed-by: ShaoHe Feng <shaohef at linux.vnet.ibm.com>
> On 12/18/2013 02:31 PM, Royce Lv wrote:
>> On 2013年12月17日 20:50, Ramon Medeiros wrote:
>>> On 12/17/2013 10:10 AM, lvroyce0210 at gmail.com wrote:
>>>> From: Royce Lv <lvroyce at linux.vnet.ibm.com>
>>>>
>>>> Abstract a helper function to parse cmd result.
>>>> Usage:
>>>> (1)get cmd result with subprocess.call or subprocess.Popen
>>>> (2) call pass_cmd_output to get formated outputs
>>>> Example:
>>>> blkid = subprocess.Popen(["cat", "/proc/mounts"],
>>>> stdout=subprocess.PIPE, stderr=subprocess.PIPE)
>>>> outs = blkid.communicate()[0]
>>>> output_items= ['path', 'mnt_point', 'type', 'option']
>>>> utils.pass_cmd_output(outs, output_items)
>>>> Sample output:
>>>> [{'path': '/dev/sda8', 'type': 'ext4',
>>>> 'option': 'rw,relatime,data=ordered', 'mnt_point': '/home'},
>>>> {'path': 'localhost:/home/royce/isorepo', 'type': 'nfs4',
>>>> 'option': 'rw...addr=127.0.0.1', 'mnt_point': '/mnt'}]
>>>>
>>>> Signed-off-by: Royce Lv <lvroyce at linux.vnet.ibm.com>
>>>> ---
>>>> src/kimchi/utils.py | 7 +++++++
>>>> 1 file changed, 7 insertions(+)
>>>>
>>>> diff --git a/src/kimchi/utils.py b/src/kimchi/utils.py
>>>> index f7eda93..1890a28 100644
>>>> --- a/src/kimchi/utils.py
>>>> +++ b/src/kimchi/utils.py
>>>> @@ -84,3 +84,10 @@ def import_class(class_path):
>>>>
>>>> def import_module(module_name):
>>>> return __import__(module_name, fromlist=[''])
>>>> +
>>>> +def parse_cmd_output(output, output_items):
>>>> + res = []
>>>> + for line in output.split("\n"):
>>> can you get the Popen result and use readlines, to get a array with
>>> the lines, instead of striping it?
>> Hi Ramon,
>>
>> Thanks for your review, I think for file read result it is OK, but
>> seems for popen.communicate just pull out the raw output , and only
>> stdout provide readlines interface, which official doc does not
>> recommend because of deadlock problem.
>> (http://docs.python.org/3.3/library/subprocess.html#subprocess.Popen.communicate).
> I think Ramon want:
> +        with open("/proc/mounts" , "rb") as f:
> +            res = []
> +            for output in f.readlines():
> +                res.append(dict(zip(['dev_path', 'mnt_point', 'type'], output.split()))
> +            return res
>
> maybe you want a common function to parse both the output from stdout
> and files.
>
> blkid = subprocess.Popen(["cat", "/proc/mounts"],
True, I want a helper function that all command can use to get a
structural result.
So that in the future if we want to get iscsi session, or other things ,
we can reuse this function.
>>
>>>> + res.append(dict(zip(output_items, line.split())))
>>>> +
>>>> + return res
>>>
>>>
>>
>
>
> Sheldon Feng(冯少合)
> IBM Linux Technology Center
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