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:

quoted

Stephen Hemminger wrote:

quoted

On Tue, 20 Feb 2018 21:39:51 +0200
Serhey Popovych [off-list ref] wrote:

quoted

Signed-off-by: Serhey Popovych <redacted>
---
 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@kenny:~/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.