Mercurial > hg > mercurial-crew-with-dirclash
view contrib/darcs2hg.py @ 2474:1e32e2fe8a67
Fix cold cache diff performance
cold cache diff performance has regressed in two ways. localrepo.changes
has optimizations for diffing against the working dir parent that expect
node1 to be None. commands.revpair() usage means that commands.dodiff()
never sends node1 == None. This is fixed in localrepo.changes by checking
against the dirstate parents.
In the non-dirstate parents case, localrepo.changes does a loop comparing
files without first sorting the file names, leading to random access
across the disk.
author | Chris Mason <mason@suse.com> |
---|---|
date | Wed, 21 Jun 2006 09:28:48 -0700 |
parents | 61909dfb316d |
children | 5ec2dded1bda |
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#!/usr/bin/env python # Encoding: iso-8859-1 # vim: tw=80 ts=4 sw=4 noet # ----------------------------------------------------------------------------- # Project : Basic Darcs to Mercurial conversion script # ----------------------------------------------------------------------------- # Author : Sebastien Pierre <sebastien@xprima.com> # Creation : 24-May-2006 # Last mod : 26-May-2006 # History : # 26-May-2006 - Updated # 24-May-2006 - First implementation # ----------------------------------------------------------------------------- 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 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. """ % (os.path.basename(sys.argv[0])) # ------------------------------------------------------------------------------ # # Utilities # # ------------------------------------------------------------------------------ def cmd(text, path=None): """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) 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() # ------------------------------------------------------------------------------ # # 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) res = [] 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") yield author, date, name, comm def darcs_pull(hg_repo, darcs_repo, change): cmd("darcs pull '%s' --all --patches='%s'" % (darcs_repo, change), hg_repo) # ------------------------------------------------------------------------------ # # Mercurial interface # # ------------------------------------------------------------------------------ def hg_commit( hg_repo, text, author, date ): fd, tmpfile = tempfile.mkstemp(prefix="darcs2hg_") writefile(tmpfile, text) cmd("hg add -X _darcs", hg_repo) cmd("hg remove -X _darcs --after", hg_repo) cmd("hg commit -l %s -u '%s' -d '%s 0'" % (tmpfile, author, date), hg_repo) os.unlink(tmpfile) # ------------------------------------------------------------------------------ # # 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]) else: print USAGE sys.exit(-1) # Initializes the target repo if not os.path.isdir(darcs_repo + "/_darcs"): print "No darcs directory found at: " + darc_repo sys.exit(-1) if not os.path.isdir(hg_repo): os.mkdir(hg_repo) else: print "Given HG repository must not exist. It will be created" sys.exit(-1) cmd("hg init '%s'" % (hg_repo)) cmd("darcs initialize", hg_repo) # Get the changes from the Darcs repository for author, date, summary, description in darcs_changes(darcs_repo): text = summary + "\n" + description darcs_pull(hg_repo, darcs_repo, summary) epoch = int(mktime(strptime(date, '%Y%m%d%H%M%S'))) hg_commit(hg_repo, text, author, epoch) # EOF