On 06/14/2013 10:43 PM, Zbigniew Jędrzejewski-Szmek wrote:
On Wed, Jun 12, 2013 at 02:41:15PM +0200, Jan Janssen wrote:
Unfortunately, to get a chronological list of boot IDs, we
need to search through the journal. sd_journal_enumerate_unique()
doesn't help us here, because the order of returned values
is undefined.
Hi Jan,
as an experiment, I tried to create the time-sorted list of boot
ids in python:
from pprint import pprint
from systemd import journal
j = journal.Reader()
matches={}
for id in j.query_unique('_BOOT_ID'):
j.add_match(_BOOT_ID=id.hex)
j.seek_head()
try:
ts = j.get_next()['__REALTIME_TIMESTAMP']
print(ts)
except OSError as e:
print(e) # [1]
else:
matches[ts] = id
j.flush_matches()
pprint(sorted(matches.items()))
This runs very fast on my machine... I have ~1GB of logs (cached in RAM),
and it runs .12s including Python load time. In fact python -c '' takes .04s,
so not an insubstantial chunk of the time for the whole query.
I think you might be overcomplicating the function to query boot
ids.
I like the idea. But sorting the boot IDs could order a few boots
wrongly, since realtime can jump backwards.
Jan
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