* [PATCH iproute2-next] ip: don't use program name to select command
@ 2021-01-11 19:05 Matteo Croce
2021-01-14 3:20 ` David Ahern
0 siblings, 1 reply; 2+ messages in thread
From: Matteo Croce @ 2021-01-11 19:05 UTC (permalink / raw)
To: netdev; +Cc: Stephen Hemminger, David Ahern
From: Matteo Croce <mcroce@microsoft.com>
ip has an ancient behaviour of looking at its program name to determine
the command to run. If the name is longer than 2 characters, the first two
letters are stripped and the others are interpreted as the command name:
$ ln -s /sbin/ip iproute
$ ln -s /sbin/ip ipa
$ ./iproute
default via 192.168.55.1 dev wlp0s20f3 proto dhcp metric 600
192.168.55.0/24 dev wlp0s20f3 proto kernel scope link src 192.168.55.26 metric 600
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
$ ./ipa show dev lo
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
This creates problems when the ip binary is renamed. For example, Yocto
renames it to 'ip.iproute2' when also the busybox implementation is
present, giving the following error:
$ ip.iproute2
Object ".iproute2" is unknown, try "ip help".
Since noone is using it, remove this undocumented feature.
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
---
ip/ip.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/ip/ip.c b/ip/ip.c
index 40d2998a..9b772307 100644
--- a/ip/ip.c
+++ b/ip/ip.c
@@ -311,9 +311,6 @@ int main(int argc, char **argv)
rtnl_set_strict_dump(&rth);
- if (strlen(basename) > 2)
- return do_cmd(basename+2, argc, argv);
-
if (argc > 1)
return do_cmd(argv[1], argc-1, argv+1);
--
2.29.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH iproute2-next] ip: don't use program name to select command
2021-01-11 19:05 [PATCH iproute2-next] ip: don't use program name to select command Matteo Croce
@ 2021-01-14 3:20 ` David Ahern
0 siblings, 0 replies; 2+ messages in thread
From: David Ahern @ 2021-01-14 3:20 UTC (permalink / raw)
To: Matteo Croce, netdev; +Cc: Stephen Hemminger
On 1/11/21 12:05 PM, Matteo Croce wrote:
> From: Matteo Croce <mcroce@microsoft.com>
>
> ip has an ancient behaviour of looking at its program name to determine
> the command to run. If the name is longer than 2 characters, the first two
> letters are stripped and the others are interpreted as the command name:
>
> $ ln -s /sbin/ip iproute
> $ ln -s /sbin/ip ipa
> $ ./iproute
> default via 192.168.55.1 dev wlp0s20f3 proto dhcp metric 600
> 192.168.55.0/24 dev wlp0s20f3 proto kernel scope link src 192.168.55.26 metric 600
> 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
> $ ./ipa show dev lo
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> inet 127.0.0.1/8 scope host lo
> valid_lft forever preferred_lft forever
>
> This creates problems when the ip binary is renamed. For example, Yocto
> renames it to 'ip.iproute2' when also the busybox implementation is
> present, giving the following error:
>
> $ ip.iproute2
> Object ".iproute2" is unknown, try "ip help".
>
> Since noone is using it, remove this undocumented feature.
>
> Signed-off-by: Matteo Croce <mcroce@microsoft.com>
> ---
> ip/ip.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/ip/ip.c b/ip/ip.c
> index 40d2998a..9b772307 100644
> --- a/ip/ip.c
> +++ b/ip/ip.c
> @@ -311,9 +311,6 @@ int main(int argc, char **argv)
>
> rtnl_set_strict_dump(&rth);
>
> - if (strlen(basename) > 2)
> - return do_cmd(basename+2, argc, argv);
> -
> if (argc > 1)
> return do_cmd(argv[1], argc-1, argv+1);
>
>
This has been around for too long to just remove it. How about adding an
option to do_cmd that this appears to be guess based on basename? If the
guess is wrong, fallback to the next do_cmd.
^ permalink raw reply [flat|nested] 2+ messages in thread
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