transaction: allow registering a temporary transaction file
During the transaction, files may be created to store or expose data
involved in the transaction (eg: changelog index data are written in
a 'changelog.i.a' for hooks). But we do not have an official way to
record such file creation and make sure they are cleaned up. The lack
of clean-up is currently okay because there is a single file involved
and a single producer/consumer.
However, as we want to expose more data (bookmarks, phases, obsmarker)
we need something more solid. The 'backupentries' mechanism could
handle that. Temporary files can be encoded as a backup of nothing
'('', <temporarypath>)'. We "need" to attach it to the same mechanism
as we use to be able to use temporary transaction files outside of
.'store/' and 'backupentries' is expected to gain such feature.
This changeset makes it clear that we should rename 'backupentries' to
something more generic.
# generate proper file state to test working copy behavior
import sys
import os
# build the combination of possible states
combination = []
for base in [None, 'content1']:
for parent in set([None, 'content2']) | set([base]):
for wcc in set([None, 'content3']) | set([base, parent]):
for tracked in (False, True):
def statestring(content):
return content is None and 'missing' or content
trackedstring = tracked and 'tracked' or 'untracked'
filename = "%s_%s_%s-%s" % (statestring(base),
statestring(parent),
statestring(wcc),
trackedstring)
combination.append((filename, base, parent, wcc))
# make sure we have stable output
combination.sort()
# retrieve the state we must generate
target = sys.argv[1]
# compute file content
content = []
for filename, base, parent, wcc in combination:
if target == 'filelist':
print filename
elif target == 'base':
content.append((filename, base))
elif target == 'parent':
content.append((filename, parent))
elif target == 'wc':
# Make sure there is content so the file gets written and can be
# tracked. It will be deleted outside of this script.
content.append((filename, wcc or 'TOBEDELETED'))
else:
print >> sys.stderr, "unknown target:", target
sys.exit(1)
# write actual content
for filename, data in content:
if data is not None:
f = open(filename, 'w')
f.write(data + '\n')
f.close()
elif os.path.exists(filename):
os.remove(filename)