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rewire cache copy mechanisms

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we separate the conversion and the copy in order to be able to copy
arbitrary files from attic without converting them. this allows us to
copy the config file cleanly without attempting to rewrite its magic
number
This commit is contained in:
Antoine Beaupré 2015-10-03 11:07:37 -04:00
parent 2c66e7c233
commit 3773681f00
1 changed files with 40 additions and 16 deletions
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56
borg/converter.py
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@ -144,25 +144,49 @@ def convert_cache(self, dryrun):
# copy of attic's get_cache_dir()
attic_cache_dir = os.environ.get('ATTIC_CACHE_DIR',
os.path.join(os.path.expanduser('~'), '.cache', 'attic'))
attic_cache_dir = os.path.join(attic_cache_dir, hexlify(self.id).decode('ascii'))
borg_cache_dir = os.path.join(get_cache_dir(), hexlify(self.id).decode('ascii'))
def copy_cache_file(file):
"""copy the given attic cache file into the borg directory
does nothing if dryrun is True. also expects
attic_cache_dir and borg_cache_dir to be set in the parent
scope, to the directories path including the repository
identifier.
:params file: the basename of the cache file to copy
(example: "files" or "chunks") as a string
:returns: the borg file that was created or None if non
was created.
"""
attic_file = os.path.join(attic_cache_dir, file)
if os.path.exists(attic_file):
borg_file = os.path.join(borg_cache_dir, file)
if os.path.exists(borg_file):
print("borg cache file already exists in %s, skipping conversion of %s" % (borg_file, attic_file))
else:
print("copying attic cache file from %s to %s" % (attic_file, borg_file))
if not dryrun:
shutil.copyfile(attic_file, borg_file)
return borg_file
else:
print("no %s cache file found in %s" % (file, attic_file))
return None
if os.path.exists(attic_cache_dir):
if not os.path.exists(borg_cache_dir):
os.makedirs(borg_cache_dir)
copy_cache_file('config')
# XXX: untested, because generating cache files is a PITA, see
# Archiver.do_create() for proof
for cache in [ 'files', 'chunks', 'config' ]:
attic_cache = os.path.join(attic_cache_dir, hexlify(self.id).decode('ascii'), cache)
if os.path.exists(attic_cache):
borg_cache_dir = os.path.join(get_cache_dir(), hexlify(self.id).decode('ascii'))
if not os.path.exists(borg_cache_dir):
os.makedirs(borg_cache_dir)
borg_cache = os.path.join(borg_cache_dir, cache)
if os.path.exists(borg_cache):
print("borg cache already exists in %s, skipping conversion of %s" % (borg_cache, attic_cache))
else:
print("copying attic cache from %s to %s" % (attic_cache, borg_cache))
if not dryrun:
shutil.copyfile(attic_cache, borg_cache)
caches += [borg_cache]
else:
print("no %s cache found in %s" % (cache, attic_cache))
for cache in [ 'files', 'chunks' ]:
copied = copy_cache_file(cache)
if copied:
caches += [copied]
for cache in caches:
print("converting cache %s" % cache)