bup repositories are in Git format. This library allows us to
interact with the Git data structures.
"""
-import os, zlib, time, subprocess, struct, stat, re, tempfile
-import heapq
+import os, sys, zlib, time, subprocess, struct, stat, re, tempfile
from bup.helpers import *
-from bup import _helpers
+from bup import _helpers, path
MIDX_VERSION = 2
def auto_midx(objdir):
- main_exe = os.environ.get('BUP_MAIN_EXE') or sys.argv[0]
- args = [main_exe, 'midx', '--auto', '--dir', objdir]
- rv = subprocess.call(args, stdout=open('/dev/null', 'w'))
+ args = [path.exe(), 'midx', '--auto', '--dir', objdir]
+ try:
+ rv = subprocess.call(args, stdout=open('/dev/null', 'w'))
+ except OSError, e:
+ # make sure 'args' gets printed to help with debugging
+ add_error('%r: exception: %s' % (args, e))
+ raise
if rv:
add_error('%r: returned %d' % (args, rv))
class PackIdx:
def __init__(self):
assert(0)
-
+
def find_offset(self, hash):
"""Get the offset of an object inside the index file."""
idx = self._idx_from_hash(hash)
ofs = struct.unpack('!I', str(buffer(self.ofstable, idx*4, 4)))[0]
if ofs & 0x80000000:
idx64 = ofs & 0x7fffffff
- ofs = struct.unpack('!I',
+ ofs = struct.unpack('!Q',
str(buffer(self.ofs64table, idx64*8, 8)))[0]
return ofs
log(('warning: index %s missing\n' +
' used by %s\n') % (n, mxf))
broken += 1
- if not broken:
+ if broken:
+ del mx
+ unlink(full)
+ else:
midxl.append(mx)
midxl.sort(lambda x,y: -cmp(len(x),len(y)))
for ix in midxl:
for f in os.listdir(self.dir):
full = os.path.join(self.dir, f)
if f.endswith('.idx') and not d.get(full):
- ix = open_idx(full)
+ try:
+ ix = open_idx(full)
+ except GitError, e:
+ add_error(e)
+ continue
d[full] = ix
self.packs = list(set(d.values()))
debug1('PackIdxList: using %d index%s.\n'
% (len(self.packs), len(self.packs)!=1 and 'es' or ''))
+ def packname_containing(self, hash):
+ # figure out which pack contains a given hash.
+ # FIXME: if the midx file format would just *store* this information,
+ # we could calculate it a lot more efficiently. But it's not needed
+ # often, so let's do it like this.
+ for f in os.listdir(self.dir):
+ if f.endswith('.idx'):
+ full = os.path.join(self.dir, f)
+ try:
+ ix = open_idx(full)
+ except GitError, e:
+ add_error(e)
+ continue
+ if ix.exists(hash):
+ return full
+
def add(self, hash):
"""Insert an additional object in the list."""
self.also[hash] = 1
else:
raise GitError('%s: expected idx file version 2, got %d'
% (filename, version))
- else:
+ elif len(header) == 8 and header[0:4] < '\377tOc':
return PackIdxV1(filename, f)
+ else:
+ raise GitError('%s: unrecognized idx file header' % filename)
elif filename.endswith('.midx'):
return PackMidx(filename)
else:
def idxmerge(idxlist, final_progress=True):
"""Generate a list of all the objects reachable in a PackIdxList."""
- total = sum(len(i) for i in idxlist)
- iters = (iter(i) for i in idxlist)
- heap = [(next(it), it) for it in iters]
- heapq.heapify(heap)
- count = 0
- last = None
- while heap:
- if (count % 10024) == 0:
- progress('Reading indexes: %.2f%% (%d/%d)\r'
- % (count*100.0/total, count, total))
- (e, it) = heap[0]
- if e != last:
- yield e
- last = e
- count += 1
- e = next(it)
- if e:
- heapq.heapreplace(heap, (e, it))
- else:
- heapq.heappop(heap)
- if final_progress:
- log('Reading indexes: %.2f%% (%d/%d), done.\n' % (100, total, total))
+ def pfunc(count, total):
+ progress('Reading indexes: %.2f%% (%d/%d)\r'
+ % (count*100.0/total, count, total))
+ def pfinal(count, total):
+ if final_progress:
+ log('Reading indexes: %.2f%% (%d/%d), done.\n' % (100, total, total))
+ return merge_iter(idxlist, 10024, pfunc, pfinal)
+
+def _make_objcache():
+ return PackIdxList(repo('objects/pack'))
class PackWriter:
"""Writes Git objects insid a pack file."""
- def __init__(self, objcache_maker=None):
+ def __init__(self, objcache_maker=_make_objcache):
self.count = 0
self.outbytes = 0
self.filename = None
self.file = None
+ self.idx = None
self.objcache_maker = objcache_maker
self.objcache = None
def __del__(self):
self.close()
- def _make_objcache(self):
- if self.objcache == None:
- if self.objcache_maker:
- self.objcache = self.objcache_maker()
- else:
- self.objcache = PackIdxList(repo('objects/pack'))
-
def _open(self):
if not self.file:
- self._make_objcache()
(fd,name) = tempfile.mkstemp(suffix='.pack', dir=repo('objects'))
self.file = os.fdopen(fd, 'w+b')
assert(name.endswith('.pack'))
self.filename = name[:-5]
self.file.write('PACK\0\0\0\2\0\0\0\0')
+ self.idx = list(list() for i in xrange(256))
- def _raw_write(self, datalist):
+ # the 'sha' parameter is used in client.py's _raw_write(), but not needed
+ # in this basic version.
+ def _raw_write(self, datalist, sha):
self._open()
f = self.file
# in case we get interrupted (eg. KeyboardInterrupt), it's best if
# to our hashsplit algorithm.) f.write() does its own buffering,
# but that's okay because we'll flush it in _end().
oneblob = ''.join(datalist)
- f.write(oneblob)
- self.outbytes += len(oneblob)
+ try:
+ f.write(oneblob)
+ except IOError, e:
+ raise GitError, e, sys.exc_info()[2]
+ nw = len(oneblob)
+ crc = zlib.crc32(oneblob) & 0xffffffff
+ self._update_idx(sha, crc, nw)
+ self.outbytes += nw
self.count += 1
+ return nw, crc
+
+ def _update_idx(self, sha, crc, size):
+ assert(sha)
+ if self.idx:
+ self.idx[ord(sha[0])].append((sha, crc, self.file.tell() - size))
- def _write(self, bin, type, content):
+ def _write(self, sha, type, content):
if verbose:
log('>')
- self._raw_write(_encode_packobj(type, content))
- return bin
+ if not sha:
+ sha = calc_hash(type, content)
+ size, crc = self._raw_write(_encode_packobj(type, content), sha=sha)
+ return sha
def breakpoint(self):
"""Clear byte and object counts and return the last processed id."""
"""Write an object in this pack file."""
return self._write(calc_hash(type, content), type, content)
+ def _require_objcache(self):
+ if self.objcache is None and self.objcache_maker:
+ self.objcache = self.objcache_maker()
+ if self.objcache is None:
+ raise GitError(
+ "PackWriter not opened or can't check exists w/o objcache")
+
def exists(self, id):
"""Return non-empty if an object is found in the object cache."""
- if not self.objcache:
- self._make_objcache()
+ self._require_objcache()
return self.objcache.exists(id)
def maybe_write(self, type, content):
"""Write an object to the pack file if not present and return its id."""
- bin = calc_hash(type, content)
- if not self.exists(bin):
- self._write(bin, type, content)
- self.objcache.add(bin)
- return bin
+ self._require_objcache()
+ sha = calc_hash(type, content)
+ if not self.exists(sha):
+ self._write(sha, type, content)
+ self.objcache.add(sha)
+ return sha
def new_blob(self, blob):
"""Create a blob object in the pack with the supplied content."""
"""Remove the pack file from disk."""
f = self.file
if f:
+ self.idx = None
self.file = None
f.close()
os.unlink(self.filename + '.pack')
- def _end(self):
+ def _end(self, run_midx=True):
f = self.file
if not f: return None
self.file = None
self.objcache = None
+ idx = self.idx
+ self.idx = None
# update object count
f.seek(8)
# calculate the pack sha1sum
f.seek(0)
sum = Sha1()
- while 1:
- b = f.read(65536)
+ for b in chunkyreader(f):
sum.update(b)
- if not b: break
- f.write(sum.digest())
-
+ packbin = sum.digest()
+ f.write(packbin)
f.close()
- p = subprocess.Popen(['git', 'index-pack', '-v',
- '--index-version=2',
- self.filename + '.pack'],
- preexec_fn = _gitenv,
- stdout = subprocess.PIPE)
- out = p.stdout.read().strip()
- _git_wait('git index-pack', p)
- if not out:
- raise GitError('git index-pack produced no output')
- nameprefix = repo('objects/pack/%s' % out)
+ idx_f = open(self.filename + '.idx', 'wb')
+ obj_list_sha = self._write_pack_idx_v2(idx_f, idx, packbin)
+ idx_f.close()
+
+ nameprefix = repo('objects/pack/pack-%s' % obj_list_sha)
if os.path.exists(self.filename + '.map'):
os.unlink(self.filename + '.map')
os.rename(self.filename + '.pack', nameprefix + '.pack')
os.rename(self.filename + '.idx', nameprefix + '.idx')
- auto_midx(repo('objects/pack'))
+ if run_midx:
+ auto_midx(repo('objects/pack'))
return nameprefix
- def close(self):
+ def close(self, run_midx=True):
"""Close the pack file and move it to its definitive path."""
- return self._end()
+ return self._end(run_midx=run_midx)
+
+ def _write_pack_idx_v2(self, file, idx, packbin):
+ sum = Sha1()
+
+ def write(data):
+ file.write(data)
+ sum.update(data)
+
+ write('\377tOc\0\0\0\2')
+
+ n = 0
+ for part in idx:
+ n += len(part)
+ write(struct.pack('!i', n))
+ part.sort(key=lambda x: x[0])
+
+ obj_list_sum = Sha1()
+ for part in idx:
+ for entry in part:
+ write(entry[0])
+ obj_list_sum.update(entry[0])
+ for part in idx:
+ for entry in part:
+ write(struct.pack('!I', entry[1]))
+ ofs64_list = []
+ for part in idx:
+ for entry in part:
+ if entry[2] & 0x80000000:
+ write(struct.pack('!I', 0x80000000 | len(ofs64_list)))
+ ofs64_list.append(struct.pack('!Q', entry[2]))
+ else:
+ write(struct.pack('!i', entry[2]))
+ for ofs64 in ofs64_list:
+ write(ofs64)
+
+ write(packbin)
+ file.write(sum.digest())
+ return obj_list_sum.hexdigest()
def _git_date(date):
def init_repo(path=None):
"""Create the Git bare repository for bup in a given path."""
guess_repo(path)
- d = repo()
+ d = repo() # appends a / to the path
+ parent = os.path.dirname(os.path.dirname(d))
+ if parent and not os.path.exists(parent):
+ raise GitError('parent directory "%s" does not exist\n' % parent)
if os.path.exists(d) and not os.path.isdir(os.path.join(d, '.')):
raise GitError('"%d" exists but is not a directory\n' % d)
p = subprocess.Popen(['git', '--bare', 'init'], stdout=sys.stderr,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
close_fds = True,
+ bufsize = 4096,
preexec_fn = _gitenv)
def _fast_get(self, id):
assert(not id.startswith('-'))
self.inprogress = id
self.p.stdin.write('%s\n' % id)
+ self.p.stdin.flush()
hdr = self.p.stdout.readline()
if hdr.endswith(' missing\n'):
self.inprogress = None
yield d
except StopIteration:
log('booger!\n')
+
+def tags():
+ """Return a dictionary of all tags in the form {hash: [tag_names, ...]}."""
+ tags = {}
+ for (n,c) in list_refs():
+ if n.startswith('refs/tags/'):
+ name = n[10:]
+ if not c in tags:
+ tags[c] = []
+
+ tags[c].append(name) # more than one tag can point at 'c'
+
+ return tags
projects / bup.git / blobdiff