# hg.py - repository classes for mercurial
#
# Copyright 2005 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
import sys, struct, sha, socket, os, time, base64, re, urllib2, binascii
from mercurial import byterange
from mercurial.transaction import *
from mercurial.revlog import *
def hex(node): return binascii.hexlify(node)
def bin(node): return binascii.unhexlify(node)
class filelog(revlog):
def __init__(self, opener, path):
s = self.encodepath(path)
revlog.__init__(self, opener, os.path.join("data", s + "i"),
os.path.join("data", s))
def encodepath(self, path):
s = sha.sha(path).digest()
s = base64.encodestring(s)[:-3]
s = re.sub("\+", "%", s)
s = re.sub("/", "_", s)
return s
def read(self, node):
return self.revision(node)
def add(self, text, transaction, link, p1=None, p2=None):
return self.addrevision(text, transaction, link, p1, p2)
def resolvedag(self, old, new, transaction, link):
"""resolve unmerged heads in our DAG"""
if old == new: return None
a = self.ancestor(old, new)
if old == a: return new
return self.merge3(old, new, a, transaction, link)
def merge3(self, my, other, base, transaction, link):
"""perform a 3-way merge and append the result"""
def temp(prefix, node):
(fd, name) = tempfile.mkstemp(prefix)
f = os.fdopen(fd, "w")
f.write(self.revision(node))
f.close()
return name
a = temp("local", my)
b = temp("remote", other)
c = temp("parent", base)
cmd = os.environ["HGMERGE"]
r = os.system("%s %s %s %s" % (cmd, a, b, c))
if r:
raise "Merge failed, implement rollback!"
t = open(a).read()
os.unlink(a)
os.unlink(b)
os.unlink(c)
return self.addrevision(t, transaction, link, my, other)
def merge(self, other, transaction, linkseq, link):
"""perform a merge and resolve resulting heads"""
(o, n) = self.mergedag(other, transaction, linkseq)
return self.resolvedag(o, n, transaction, link)
class manifest(revlog):
def __init__(self, opener):
self.mapcache = None
self.listcache = None
self.addlist = None
revlog.__init__(self, opener, "00manifest.i", "00manifest.d")
def read(self, node):
if self.mapcache and self.mapcache[0] == node:
return self.mapcache[1]
text = self.revision(node)
map = {}
self.listcache = text.splitlines(1)
for l in self.listcache:
(f, n) = l.split('\0')
map[f] = bin(n[:40])
self.mapcache = (node, map)
return map
def diff(self, a, b):
# this is sneaky, as we're not actually using a and b
if self.listcache:
return mdiff.diff(self.listcache, self.addlist, 1)
else:
return mdiff.diff(a, b)
def add(self, map, transaction, link, p1=None, p2=None):
files = map.keys()
files.sort()
self.addlist = ["%s\000%s\n" % (f, hex(map[f])) for f in files]
text = "".join(self.addlist)
n = self.addrevision(text, transaction, link, p1, p2)
self.mapcache = (n, map)
self.listcache = self.addlist
return n
class changelog(revlog):
def __init__(self, opener):
revlog.__init__(self, opener, "00changelog.i", "00changelog.d")
def extract(self, text):
last = text.index("\n\n")
desc = text[last + 2:]
l = text[:last].splitlines()
manifest = bin(l[0])
user = l[1]
date = l[2]
files = l[3:]
return (manifest, user, date, files, desc)
def read(self, node):
return self.extract(self.revision(node))
def add(self, manifest, list, desc, transaction, p1=None, p2=None):
try: user = os.environ["HGUSER"]
except: user = os.environ["LOGNAME"] + '@' + socket.getfqdn()
date = "%d %d" % (time.time(), time.timezone)
list.sort()
l = [hex(manifest), user, date] + list + ["", desc]
text = "\n".join(l)
return self.addrevision(text, transaction, self.count(), p1, p2)
def merge3(self, my, other, base):
pass
class dircache:
def __init__(self, opener):
self.opener = opener
self.dirty = 0
self.map = None
def __del__(self):
if self.dirty: self.write()
def __getitem__(self, key):
try:
return self.map[key]
except TypeError:
self.read()
return self[key]
def read(self):
if self.map is not None: return self.map
self.map = {}
try:
st = self.opener("dircache").read()
except: return
pos = 0
while pos < len(st):
e = struct.unpack(">llll", st[pos:pos+16])
l = e[3]
pos += 16
f = st[pos:pos + l]
self.map[f] = e[:3]
pos += l
def update(self, files):
if not files: return
self.read()
self.dirty = 1
for f in files:
try:
s = os.stat(f)
self.map[f] = (s.st_mode, s.st_size, s.st_mtime)
except IOError:
self.remove(f)
def taint(self, files):
if not files: return
self.read()
self.dirty = 1
for f in files:
self.map[f] = (0, -1, 0)
def remove(self, files):
if not files: return
self.read()
self.dirty = 1
for f in files:
try: del self[f]
except: pass
def clear(self):
self.map = {}
self.dirty = 1
def write(self):
st = self.opener("dircache", "w")
for f, e in self.map.items():
e = struct.pack(">llll", e[0], e[1], e[2], len(f))
st.write(e + f)
self.dirty = 0
def copy(self):
self.read()
return self.map.copy()
# used to avoid circular references so destructors work
def opener(base):
p = base
def o(path, mode="r"):
f = os.path.join(p, path)
if p[:7] == "http://":
return httprangereader(f)
if mode != "r" and os.path.isfile(f):
s = os.stat(f)
if s.st_nlink > 1:
file(f + ".tmp", "w").write(file(f).read())
os.rename(f+".tmp", f)
return file(f, mode)
return o
class repository:
def __init__(self, ui, path=None, create=0):
self.remote = 0
if path and path[:7] == "http://":
self.remote = 1
self.path = path
else:
if not path:
p = os.getcwd()
while not os.path.isdir(os.path.join(p, ".hg")):
p = os.path.dirname(p)
if p == "/": raise "No repo found"
path = p
self.path = os.path.join(path, ".hg")
self.root = path
self.ui = ui
if create:
os.mkdir(self.path)
os.mkdir(self.join("data"))
self.opener = opener(self.path)
self.manifest = manifest(self.opener)
self.changelog = changelog(self.opener)
self.ignorelist = None
if not self.remote:
self.dircache = dircache(self.opener)
try:
self.current = bin(self.opener("current").read())
except IOError:
self.current = None
def setcurrent(self, node):
self.current = node
self.opener("current", "w").write(hex(node))
def ignore(self, f):
if self.ignorelist is None:
self.ignorelist = []
try:
l = open(os.path.join(self.root, ".hgignore")).readlines()
for pat in l:
self.ignorelist.append(re.compile(pat[:-1]))
except IOError: pass
for pat in self.ignorelist:
if pat.search(f): return True
return False
def join(self, f):
return os.path.join(self.path, f)
def file(self, f):
return filelog(self.opener, f)
def transaction(self):
return transaction(self.opener, self.join("journal"))
def merge(self, other):
tr = self.transaction()
changed = {}
new = {}
nextrev = seqrev = self.changelog.count()
# helpers for back-linking file revisions to local changeset
# revisions so we can immediately get to changeset from annotate
def accumulate(text):
n = nextrev
# track which files are added in which changeset and the
# corresponding _local_ changeset revision
files = self.changelog.extract(text)[3]
for f in files:
changed.setdefault(f, []).append(n)
n += 1
def seq(start):
while 1:
yield start
start += 1
def lseq(l):
for r in l:
yield r
# begin the import/merge of changesets
self.ui.status("merging new changesets\n")
(co, cn) = self.changelog.mergedag(other.changelog, tr,
seq(seqrev), accumulate)
resolverev = self.changelog.count()
# is there anything to do?
if co == cn:
tr.close()
return
# do we need to resolve?
simple = (co == self.changelog.ancestor(co, cn))
# merge all files changed by the changesets,
# keeping track of the new tips
changelist = changed.keys()
changelist.sort()
for f in changelist:
sys.stdout.write(".")
sys.stdout.flush()
r = self.file(f)
node = r.merge(other.file(f), tr, lseq(changed[f]), resolverev)
if node:
new[f] = node
sys.stdout.write("\n")
# begin the merge of the manifest
self.ui.status("merging manifests\n")
(mm, mo) = self.manifest.mergedag(other.manifest, tr, seq(seqrev))
# For simple merges, we don't need to resolve manifests or changesets
if simple:
tr.close()
return
ma = self.manifest.ancestor(mm, mo)
# resolve the manifest to point to all the merged files
self.ui.status("resolving manifests\n")
mmap = self.manifest.read(mm) # mine
omap = self.manifest.read(mo) # other
amap = self.manifest.read(ma) # ancestor
nmap = {}
for f, mid in mmap.iteritems():
if f in omap:
if mid != omap[f]:
nmap[f] = new.get(f, mid) # use merged version
else:
nmap[f] = new.get(f, mid) # they're the same
del omap[f]
elif f in amap:
if mid != amap[f]:
pass # we should prompt here
else:
pass # other deleted it
else:
nmap[f] = new.get(f, mid) # we created it
del mmap
for f, oid in omap.iteritems():
if f in amap:
if oid != amap[f]:
pass # this is the nasty case, we should prompt
else:
pass # probably safe
else:
nmap[f] = new.get(f, oid) # remote created it
del omap
del amap
node = self.manifest.add(nmap, tr, resolverev, mm, mo)
# Now all files and manifests are merged, we add the changed files
# and manifest id to the changelog
self.ui.status("committing merge changeset\n")
new = new.keys()
new.sort()
if co == cn: cn = -1
edittext = "\n"+"".join(["HG: changed %s\n" % f for f in new])
edittext = self.ui.edit(edittext)
n = self.changelog.add(node, new, edittext, tr, co, cn)
tr.close()
def commit(self, update = None, text = ""):
tr = self.transaction()
try:
remove = [ l[:-1] for l in self.opener("to-remove") ]
os.unlink(self.join("to-remove"))
except IOError:
remove = []
if update == None:
update = self.diffdir(self.root)[0]
# check in files
new = {}
linkrev = self.changelog.count()
for f in update:
try:
t = file(f).read()
except IOError:
remove.append(f)
continue
r = self.file(f)
new[f] = r.add(t, tr, linkrev)
# update manifest
mmap = self.manifest.read(self.manifest.tip())
mmap.update(new)
for f in remove:
del mmap[f]
mnode = self.manifest.add(mmap, tr, linkrev)
# add changeset
new = new.keys()
new.sort()
edittext = text + "\n"+"".join(["HG: changed %s\n" % f for f in new])
edittext = self.ui.edit(edittext)
n = self.changelog.add(mnode, new, edittext, tr)
tr.close()
self.setcurrent(n)
self.dircache.update(new)
self.dircache.remove(remove)
def checkdir(self, path):
d = os.path.dirname(path)
if not d: return
if not os.path.isdir(d):
self.checkdir(d)
os.mkdir(d)
def checkout(self, node):
# checkout is really dumb at the moment
# it ought to basically merge
change = self.changelog.read(node)
mmap = self.manifest.read(change[0])
l = mmap.keys()
l.sort()
stats = []
for f in l:
r = self.file(f)
t = r.revision(mmap[f])
try:
file(f, "w").write(t)
except:
self.checkdir(f)
file(f, "w").write(t)
self.setcurrent(node)
self.dircache.clear()
self.dircache.update(l)
def diffdir(self, path):
dc = self.dircache.copy()
changed = []
mf = {}
added = []
if self.current:
change = self.changelog.read(self.current)
mf = self.manifest.read(change[0])
for dir, subdirs, files in os.walk(self.root):
d = dir[len(self.root)+1:]
if ".hg" in subdirs: subdirs.remove(".hg")
for f in files:
fn = os.path.join(d, f)
try: s = os.stat(fn)
except: continue
if fn in dc:
c = dc[fn]
del dc[fn]
if c[1] != s.st_size:
changed.append(fn)
elif c[0] != s.st_mode or c[2] != s.st_mtime:
t1 = file(fn).read()
t2 = self.file(fn).revision(mf[fn])
if t1 != t2:
changed.append(fn)
else:
if self.ignore(fn): continue
added.append(fn)
deleted = dc.keys()
deleted.sort()
return (changed, added, deleted)
def add(self, list):
self.dircache.taint(list)
def remove(self, list):
dl = self.opener("to-remove", "a")
for f in list:
dl.write(f + "\n")
class ui:
def __init__(self, verbose=False, debug=False):
self.verbose = verbose
def write(self, *args):
for a in args:
sys.stdout.write(str(a))
def prompt(self, msg, pat):
while 1:
sys.stdout.write(msg)
r = sys.stdin.readline()[:-1]
if re.match(pat, r):
return r
def status(self, *msg):
self.write(*msg)
def warn(self, msg):
self.write(*msg)
def note(self, msg):
if self.verbose: self.write(*msg)
def debug(self, msg):
if self.debug: self.write(*msg)
def edit(self, text):
(fd, name) = tempfile.mkstemp("hg")
f = os.fdopen(fd, "w")
f.write(text)
f.close()
editor = os.environ.get("EDITOR", "vi")
r = os.system("%s %s" % (editor, name))
if r:
raise "Edit failed!"
t = open(name).read()
t = re.sub("(?m)^HG:.*\n", "", t)
return t
class httprangereader:
def __init__(self, url):
self.url = url
self.pos = 0
def seek(self, pos):
self.pos = pos
def read(self, bytes=None):
opener = urllib2.build_opener(byterange.HTTPRangeHandler())
urllib2.install_opener(opener)
req = urllib2.Request(self.url)
end = ''
if bytes: end = self.pos + bytes
req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
f = urllib2.urlopen(req)
return f.read()