netdev - Re: [PATCH iproute2-next 1/8] iplink: Return from function instead of calling exit()

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Date:   Tue, 20 Feb 2018 22:44:23 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next 1/8] iplink: Return from function instead of
 calling exit()

David Ahern wrote:
> On 2/20/18 1:17 PM, Serhey Popovych wrote:
>> Stephen Hemminger wrote:
>>> On Tue, 20 Feb 2018 21:39:51 +0200
>>> Serhey Popovych <serhe.popovych@...il.com> wrote:
>>>
>>>> Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
>>>> ---
>>>>  ip/iplink.c |   12 ++++++------
>>>>  1 file changed, 6 insertions(+), 6 deletions(-)
>>>>
>>>> diff --git a/ip/iplink.c b/ip/iplink.c
>>>> index 74c377c..a2c8108 100644
>>>> --- a/ip/iplink.c
>>>> +++ b/ip/iplink.c
>>>> @@ -653,7 +653,7 @@ int iplink_parse(int argc, char **argv, struct iplink_req *req,
>>>>  			NEXT_ARG();
>>>>  			if (xdp_parse(&argc, &argv, req, dev_index,
>>>>  				      generic, drv, offload))
>>>> -				exit(-1);
>>>> +				return -1;
>>>>  		} else if (strcmp(*argv, "netns") == 0) {
>>>>  			NEXT_ARG();
>>>>  			if (netns != -1)
>>>> @@ -972,12 +972,12 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
>>>>  		if (!dev) {
>>>>  			fprintf(stderr,
>>>>  				"Not enough information: \"dev\" argument is required.\n");
>>>> -			exit(-1);
>>>> +			return -1;
>>>>  		}
>>>>  		if (cmd == RTM_NEWLINK && index) {
>>>>  			fprintf(stderr,
>>>>  				"index can be used only when creating devices.\n");
>>>> -			exit(-1);
>>>> +			return -1;
>>>>  		}
>>>>  
>>>>  		req.i.ifi_index = ll_name_to_index(dev);
>>>> @@ -1392,7 +1392,7 @@ static int do_set(int argc, char **argv)
>>>>  	if (!dev) {
>>>>  		fprintf(stderr,
>>>>  			"Not enough of information: \"dev\" argument is required.\n");
>>>> -		exit(-1);
>>>> +		return -1;
>>>>  	}
>>>>  
>>>>  	if (newaddr || newbrd) {
>>>> @@ -1553,7 +1553,7 @@ static int iplink_afstats(int argc, char **argv)
>>>>  			fprintf(stderr,
>>>>  				"Command \"%s\" is unknown, try \"ip link help\".\n",
>>>>  				*argv);
>>>> -			exit(-1);
>>>> +			return -1;
>>>>  		}
>>>>  
>>>>  		argv++; argc--;
>>>> @@ -1648,5 +1648,5 @@ int do_iplink(int argc, char **argv)
>>>>  
>>>>  	fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n",
>>>>  		*argv);
>>>> -	exit(-1);
>>>> +	return -1;
>>>>  }
>>>
>>> Not sure I like this. If given bad input in batch it is better to stop and exit
>>> rather than continuing with more bad data.
>>
>> When preparing this change I think in opposite direction: we want to
>> continue batch mode if single line is broken.
>>
> 
> batch mode needs to stop on the line that fails. That said, batch still
> fails with the /exit/return/ change
> 
> $ cat /tmp/ip.batch
> li sh
> li foo
> li add veth1 type veth peer name veth2
> 
> Current command
> $ ip -batch /tmp/ip.batch
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
> DEFAULT group default qlen 1000
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 
> <link list snipped>
> Command "foo" is unknown, try "ip link help".
> $ echo $?
> 255
> 
> $ ip/ip -batch /tmp/ip.batch
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
> DEFAULT group default qlen 1000
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> <link list snipped>
> Command "foo" is unknown, try "ip link help".
> Command failed /tmp/ip.batch:2
> dsa@...ny:~/iproute2/iproute2-next.git$ echo $?
> 1
> 
> I like that better because it tells me the line that fails.
> 
Okay, now is clear. Will prepare v2 according to these rules.




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