On 1/11/21 12:05 PM, Matteo Croce wrote: > From: Matteo Croce <mcr...@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 <mcr...@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.
