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__init__.py
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__init__.py
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#!/usr/bin/env python
import sys
from couchdb import Server
from couchdb.http import ResourceConflict, ResourceNotFound
from urlparse import urlparse
from subprocess import Popen, STDOUT, PIPE
from shlex import split
from json import loads, dumps
from binascii import b2a_hex, a2b_hex
from cStringIO import StringIO
# Whether or not to show debug messages
DEBUG = True
def system(cmd):
process = Popen(split(cmd), stderr=STDOUT, stdout=PIPE)
# from http://stackoverflow.com/questions/1388753/how-to-get-output-from-subprocess-popen
value = ""
while True:
read = process.stdout.read(1)
value += read
if read == '' and process.poll() != None:
return value
def notify(msg, *args):
"""Print a message to stderr."""
print >> sys.stderr, msg % args
sys.stderr.flush()
def debug (msg, *args):
"""Print a debug message to stderr when DEBUG is enabled."""
if DEBUG:
print >> sys.stderr, msg % args
sys.stderr.flush()
def stdout(msg=None):
if msg == None:
msg = ""
debug("out: %s" % msg)
sys.stderr.flush()
print msg
sys.stdout.flush()
def error (msg, *args):
"""Print an error message to stderr."""
print >> sys.stderr, "ERROR:", msg % args
sys.stderr.flush()
def warn(msg, *args):
"""Print a warning message to stderr."""
print >> sys.stderr, "warning:", msg % args
sys.stderr.flush()
def die (msg, *args):
"""Print as error message to stderr and exit the program."""
error(msg, *args)
sys.exit(1)
class CouchRemote(object):
DESIGN_DOCUMENT = {
"_id": "_design/git_remote_couch",
"views": {
"refs": {
"map": "function(doc){ if (doc._id.match(/^refs/)){emit(doc._id, doc.content)}}"
}
}
}
@property
def server(self):
if self._server != None:
return self._server
parsed = urlparse(self.url)
try:
self._server = Server('%s://%s/' % (parsed.scheme, parsed.netloc))
return self._server
except Exception, e:
debug(repr(e))
die("Can't connect")
@property
def couch(self):
"""Creates the remote couch"""
if self._couch != None:
return self._couch
parsed = urlparse(self.url)
db_name = parsed.path.lstrip("/")
try:
self._couch = self.server[db_name]
except ResourceNotFound:
self._couch = self.server.create(db_name)
return self._couch
def __init__(self, _, alias, url):
self._couch = None
self._server = None
sanitize = lambda value: value.replace('http+couch', 'http', 1)
self.alias = sanitize(alias)
self.url = sanitize(url)
self.ls_remote = {}
debug("Got arguments %s", (self.alias, self.url))
more = True
while (more):
more = self.read_one_line()
def do_capabilities(self, line):
stdout("fetch")
stdout("list")
stdout("option")
stdout("push")
stdout()
def do_list(self, line):
"""Lists all the refs"""
head = None
for row in self.view('refs'):
key = row['key']
value = row['value'].strip("\n")
self.ls_remote[key] = value
stdout("%s %s" % (value, key))
head = key # update, last one is just the HEAD
if head:
stdout("@%s HEAD" % row['key'])
stdout()
def do_push(self, line):
src, dst = line[0].split(":")
rev_list = system("git rev-list --objects %s" % src)
for obj in rev_list.split('\n'):
obj = obj.split()
if obj:
doc = {}
hash = obj[0]
doc['type'] = system("git cat-file -t %s" % hash).strip("\n")
doc['content'] = system("git cat-file %s %s" % (doc['type'], hash))
# prepare doc
if doc['type'] == 'tree':
tree_list = StringIO(doc['content'])
doc['content'] = []
ascii = ''
while True:
c = tree_list.read(1)
if c == '\x00':
sha = b2a_hex(tree_list.read(20))
mode, filename = ascii.split(" ")
ascii = ''
doc['content'].append([mode, filename, sha])
elif c == '':
break
else:
ascii += c
elif doc['type'] == 'commit':
header, message = doc['content'].split("\n\n", 1)
for line in header.split("\n"):
name, value = line.split(" ", 1)
doc[name] = value
doc['content'] = message
# upload doc
try:
if doc['type'] in ('tree', 'commit',):
self.couch[hash] = doc
elif doc['type'] in ('blob',):
self.couch[hash] = {'type': doc['type']}
blobdoc = self.couch[hash]
self.couch.put_attachment(
doc = blobdoc,
content = doc['content'],
filename = 'blob',
content_type = 'application/octet-stream')
except ResourceConflict, e:
pass # ignore, must be the same then
try:
dstref = self.couch[dst]
except ResourceNotFound:
dstref = {'content': None}
localref = system("git rev-parse %s" % src)
if dstref['content'] != localref:
dstref['content'] = localref
self.couch[dst] = dstref
else:
assert False, "this should not happen"
stdout("ok %s" % dst)
def do_fetch(self, line):
initial, ref = line
# read the terminating blank line
assert not self._read_one_line()
fetch = [initial]
while fetch:
hash = fetch.pop()
doc = self.couch[hash]
content = []
if doc['type'] == 'commit':
for key in ('tree', 'parent', 'author', 'committer'):
if key in doc:
if key in ('tree', 'parent'):
fetch.append(doc[key])
content.append('%s %s\n' % (key, doc[key]))
content.append("\n%s" % doc['content'])
elif doc['type'] == 'tree':
for mode, filename, sha in doc['content']:
fetch.append(sha)
content.append("%s %s\x00" % (mode, filename))
content.append(a2b_hex(sha))
elif doc['type'] == 'blob':
blob = self.couch.get_attachment(doc, 'blob', None)
if blob == None:
content.append('') # necessary ?
else:
content.append(blob.read())
else:
content.append(doc['content'])
cmd = str("git hash-object -t %s -w --stdin" % doc['type'])
process = Popen(split(cmd),
stdin=PIPE, stdout=PIPE, stderr=STDOUT)
for chunk in content:
process.stdin.write(chunk)
process.stdin.close()
process.wait()
system("git update-ref %s %s" % (ref, initial))
stdout()
def do_option(self, line):
stdout("unsupported")
def view(self, name, attempt=0):
if attempt > 2:
die("Too many attempts to install design document")
try:
result = self.couch.view('git_remote_couch/%s' % name)
result._fetch() # force evaluation (to trigger 404)
return result
except ResourceNotFound:
# install / update design document
try:
self.couch['_design/git_remote_couch'] = self.DESIGN_DOCUMENT
except:
die("Could not add design document to '_design/git_remote_couch'")
return self.view(name, attempt+1)
def _read_one_line(self):
"""Reads one command."""
cmdline = sys.stdin.readline()
if not cmdline:
warn("Unexpected EOF")
return False
return cmdline.strip().split()
def read_one_line(self):
"""Processes one command."""
cmdline = self._read_one_line()
if not cmdline:
# Blank line means we're about to quit
return False
cmd = cmdline.pop(0)
debug("Got command '%s' with args '%s'", cmd, ' '.join(cmdline))
try:
func = getattr(self, "do_%s" % cmd)
except AttributeError, e:
die("Unknown command: '%s'", cmd)
func(cmdline)
sys.stdout.flush()
return True
def main():
if len(sys.argv) != 3:
die("Expecting exactly three arguments.")
sys.exit(1)
CouchRemote(*sys.argv)