On Thu, Nov 16, 2017 at 03:24:39AM +0900, Masatake YAMATO wrote:
> By parsing this file (with libmount), we can say
> /run/netns/UTIL-LINUX-LSNS-TEST-NS is the logical name for
> net:[4026532562] either the mount point is created by ip command or
> not.
Nice. Yes, all you need is:
tab = mnt_new_table_from_file(_PATH_PROC_MOUNTINFO);
.. see for example sys-utils/fstrim.c, and mnt_fs_get_fstype() and
mnt_fs_get_source().
> "ip link show" still uses netnsid, so I think my patch still makes
> sense. However, as you wrote, making a column for logical name,
> is more useful. It is not limited to net namespace.
>
> A namespace can have more than one logical names.
> I wonder how to print them in a column.
libsmart supports multi-line cells:
* use SCOLS_FL_WRAP for the column
* set wrap function, for example in lsns.c: init_scols_table():
cl = scols_table_new_column(tab, col->name, col->whint, flags)
if (flags & SCOLS_FL_WRAP) {
scols_column_set_wrapfunc(cl,
scols_wrapnl_chunksize,
scols_wrapnl_nextchunk,
NULL);
scols_column_set_safechars(cl, "\n");
}
* and in add_scols_line() where you compose output add to the table
string where namespace names are separated by '\n', e.g. "aaa\nbbb"
This feature should be probably disabled for --raw, maybe add --nowrap
and in this case use "," as separator and remove SCOLS_FL_WRAP for the
column in init_scols_table().
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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