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#!/usr/bin/env lua
--[[
This program acts like journalctl --list-boots
]]
local sj = require "systemd.journal"
local j = assert(sj.open())
local t = {}
local n = 0
for boot_id in j:each_unique("_BOOT_ID") do
local boot_info = {
id = boot_id;
}
n = n + 1
t[n] = boot_info
-- We need to find the first and last entries for each boot
assert(j:add_match("_BOOT_ID="..boot_id))
assert(j:seek_head())
assert(j:next())
boot_info.head = j:get_realtime_usec()
assert(j:seek_tail())
assert(j:previous())
boot_info.tail = j:get_realtime_usec()
j:flush_matches()
end
table.sort(t, function(a,b) return a.head < b.head end)
local d_width = math.floor(math.log(n, 10))+2
for i=1, n do
local boot_info = t[i]
io.write(string.format("%"..d_width.."d %s %s—%s\n",
i-n, boot_info.id,
os.date("%a %Y-%m-%d %H:%M:%S %Z", boot_info.head/1e6),
os.date("%a %Y-%m-%d %H:%M:%S %Z", boot_info.tail/1e6)
))
end
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