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backups: predict when the next backup will occur

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Joshua Tauberer
2015-03-08 20:55:39 +00:00
parent b539c2df70
commit c18d58b13f
3 changed files with 24 additions and 3 deletions
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22
management/backup.py
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@@ -67,9 +67,29 @@ def backup_status(env):
# This is relied on by should_force_full() and the next step.
backups = sorted(backups.values(), key = lambda b : b["date"], reverse=True)
# Get the average size of incremental backups and the size of the
# most recent full backup.
incremental_count = 0
incremental_size = 0
first_full_size = None
for bak in backups:
if bak["full"]:
first_full_size = bak["size"]
break
incremental_count += 1
incremental_size += bak["size"]
# Predict how many more increments until the next full backup,
# and add to that the time we hold onto backups, to predict
# how long the most recent full backup+increments will be held
# onto. Round up since the backup occurs on the night following
# when the threshold is met.
deleted_in = None
if incremental_count > 0 and first_full_size is not None:
deleted_in = "approx. %d days" % round(keep_backups_for_days + (.5 * first_full_size - incremental_size) / (incremental_size/incremental_count) + .5)
# When will a backup be deleted?
saw_full = False
deleted_in = None
days_ago = now - datetime.timedelta(days=keep_backups_for_days)
for bak in backups:
if deleted_in: