diff options
Diffstat (limited to 'lib/data.lua')
| -rw-r--r-- | lib/data.lua | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/data.lua b/lib/data.lua index 98c6898..4803f5b 100644 --- a/lib/data.lua +++ b/lib/data.lua @@ -378,4 +378,29 @@ function M.board_name(vendor, name) return name or vendor end +-- The IPv4 address from `ip -4 addr show <iface>` output. +-- +-- Split from the command that produces it so it can be tested against a +-- fixture: every other parser in this file follows the same split, and an +-- address is exactly the kind of value that must not be hardcoded in a test. +function M.iface_addr_parse(text) + if type(text) ~= 'string' then return nil end + return text:match('inet%s+(%d+%.%d+%.%d+%.%d+)') +end + +-- The interface's IPv4 address, or nil when it has none. +-- +-- This shells out, which the draw hook otherwise never does, so the caller +-- memoizes it: an address does not change without an event this dashboard +-- does not watch. Retried while nil, because a bridge may not be up when +-- conky starts. +function M.iface_addr(iface) + if type(iface) ~= 'string' then return nil end + local p = io.popen('ip -4 addr show ' .. ("%q"):format(iface) .. ' 2>/dev/null') + if not p then return nil end + local out = p:read('*a') + p:close() + return M.iface_addr_parse(out) +end + return M |