#!/usr/bin/env python
# Encoding: iso-8859-1
# vim: tw=80 ts=4 sw=4 noet
# -----------------------------------------------------------------------------
# Project : Basic Darcs to Mercurial conversion script
# -----------------------------------------------------------------------------
# Authors : Sebastien Pierre <sebastien@xprima.com>
# TK Soh <teekaysoh@gmail.com>
# -----------------------------------------------------------------------------
# Creation : 24-May-2006
# Last mod : 05-Jun-2006
# -----------------------------------------------------------------------------
import os, sys
import tempfile
import xml.dom.minidom as xml_dom
from time import strptime, mktime
DARCS_REPO = None
HG_REPO = None
USAGE = """\
%s DARCSREPO HGREPO [SKIP]
Converts the given Darcs repository to a new Mercurial repository. The given
HGREPO must not exist, as it will be created and filled up (this will avoid
overwriting valuable data.
In case an error occurs within the process, you can resume the process by
giving the last successfuly applied change number.
""" % (os.path.basename(sys.argv[0]))
# ------------------------------------------------------------------------------
#
# Utilities
#
# ------------------------------------------------------------------------------
def cmd(text, path=None, silent=False):
"""Executes a command, in the given directory (if any), and returns the
command result as a string."""
cwd = None
if path:
path = os.path.abspath(path)
cwd = os.getcwd()
os.chdir(path)
if not silent: print "> ", text
res = os.popen(text).read()
if path:
os.chdir(cwd)
return res
def writefile(path, data):
"""Writes the given data into the given file."""
f = file(path, "w") ; f.write(data) ; f.close()
def error( *args ):
sys.stderr.write("ERROR: ")
for a in args: sys.stderr.write(str(a))
sys.stderr.write("\n")
sys.stderr.write("You can make manual fixes if necessary and then resume by"
" giving the last changeset number")
sys.exit(-1)
# ------------------------------------------------------------------------------
#
# Darcs interface
#
# ------------------------------------------------------------------------------
def darcs_changes(darcsRepo):
"""Gets the changes list from the given darcs repository. This returns the
chronological list of changes as (change name, change summary)."""
changes = cmd("darcs changes --reverse --xml-output", darcsRepo)
doc = xml_dom.parseString(changes)
for patch_node in doc.childNodes[0].childNodes:
name = filter(lambda n:n.nodeName == "name", patch_node.childNodes)
comm = filter(lambda n:n.nodeName == "comment", patch_node.childNodes)
if not name:continue
else: name = name[0].childNodes[0].data
if not comm: comm = ""
else: comm = comm[0].childNodes[0].data
author = patch_node.getAttribute("author")
date = patch_node.getAttribute("date")
chash = os.path.splitext(patch_node.getAttribute("hash"))[0]
yield author, date, name, chash, comm
def darcs_tip(darcs_repo):
changes = cmd("darcs changes",darcs_repo,silent=True)
changes = filter(lambda l:l.strip().startswith("* "), changes.split("\n"))
return len(changes)
def darcs_pull(hg_repo, darcs_repo, chash):
old_tip = darcs_tip(darcs_repo)
res = cmd("darcs pull \"%s\" --all --match=\"hash %s\"" % (darcs_repo, chash), hg_repo)
print res
new_tip = darcs_tip(darcs_repo)
if not new_tip != old_tip + 1:
error("Darcs pull did not work as expected: " + res)
# ------------------------------------------------------------------------------
#
# Mercurial interface
#
# ------------------------------------------------------------------------------
def hg_commit( hg_repo, text, author, date ):
fd, tmpfile = tempfile.mkstemp(prefix="darcs2hg_")
writefile(tmpfile, text)
old_tip = hg_tip(hg_repo)
cmd("hg add -X _darcs", hg_repo)
cmd("hg remove -X _darcs --after", hg_repo)
res = cmd("hg commit -l %s -u \"%s\" -d \"%s 0\"" % (tmpfile, author, date), hg_repo)
os.close(fd)
os.unlink(tmpfile)
new_tip = hg_tip(hg_repo)
if not new_tip == old_tip + 1:
# Sometimes we may have empty commits, we simply skip them
if res.strip().lower().find("nothing changed") != -1:
pass
else:
error("Mercurial commit did not work as expected: " + res)
def hg_tip( hg_repo ):
"""Returns the latest local revision number in the given repository."""
tip = cmd("hg tip", hg_repo, silent=True)
tip = tip.split("\n")[0].split(":")[1].strip()
return int(tip)
# ------------------------------------------------------------------------------
#
# Main
#
# ------------------------------------------------------------------------------
if __name__ == "__main__":
args = sys.argv[1:]
# We parse the arguments
if len(args) == 2:
darcs_repo = os.path.abspath(args[0])
hg_repo = os.path.abspath(args[1])
skip = None
elif len(args) == 3:
darcs_repo = os.path.abspath(args[0])
hg_repo = os.path.abspath(args[1])
skip = int(args[2])
else:
print USAGE
sys.exit(-1)
# Initializes the target repo
if not os.path.isdir(darcs_repo + "/_darcs"):
print "No darcs directory found at: " + darcs_repo
sys.exit(-1)
if not os.path.isdir(hg_repo):
os.mkdir(hg_repo)
elif skip == None:
print "Given HG repository must not exist when no SKIP is specified."
sys.exit(-1)
if skip == None:
cmd("hg init \"%s\"" % (hg_repo))
cmd("darcs initialize", hg_repo)
# Get the changes from the Darcs repository
change_number = 0
for author, date, summary, chash, description in darcs_changes(darcs_repo):
print "== changeset", change_number,
if skip != None and change_number <= skip:
print "(skipping)"
else:
text = summary + "\n" + description
darcs_pull(hg_repo, darcs_repo, chash)
# The commit hash has a date like 20021020201112
# --------------------------------YYYYMMDDHHMMSS
date = chash.split("-")[0]
epoch = int(mktime(strptime(date, '%Y%m%d%H%M%S')))
hg_commit(hg_repo, text, author, epoch)
change_number += 1
print "Darcs repository (_darcs) was not deleted. You can keep or remove it."
# EOF