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

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Date:   Tue, 20 Feb 2018 12:44:13 -0800
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     David Ahern <dsahern@...il.com>,
        Serhey Popovych <serhe.popovych@...il.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next 1/8] iplink: Return from function instead of
 calling exit()

On Tue, Feb 20, 2018 at 12:33 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> On Tue, 20 Feb 2018 13:27:21 -0700
> David Ahern <dsahern@...il.com> 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.
>
> Normally ip batch will exit on errors.
> The question is what about -force?

on -force, it needs to continue.