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hg: support for auto sharing stores when cloning...
hg: support for auto sharing stores when cloning Many 3rd party consumers of Mercurial have created wrappers to essentially perform clone+share as a single operation. This is especially popular in automated processes like continuous integration systems. The Jenkins CI software and Mozilla's Firefox release automation infrastructure have both implemented custom code that effectively perform clone+share. The common use case here is that clients want to obtain N>1 checkouts while minimizing disk space and network requirements. Furthermore, they often don't care that a clone is an exact mirror of a remote: they are simply looking to obtain checkouts of specific revisions. When multiple third parties implement a similar feature, it's a good sign that the feature is worth adding to the core product. This patch adds support for an easy-to-use clone+share feature. The internal "clone" function now accepts options to control auto sharing during clone. When the auto share mode is active, a store will be created/updated under the base directory specified and a new repository pointing to the shared store will be created at the path specified by the user. The share extension has grown the ability to pass these options into the clone command/function. No command line options for this feature are added because we don't feel the feature will be popular enough to warrant their existence. There are two modes for auto share mode. In the default mode, the shared repo is derived from the first changeset (rev 0) in the remote repository. This enables related repositories existing at different URLs to automatically use the same storage. In environments that operate several repositories (separate repo for branch/head/bookmark or separate repo per user), this has the potential to drastically reduce storage and network requirements. In the other mode, the name is derived from the remote's path/URL.

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hgk.py
335 lines | 11.1 KiB | text/x-python | PythonLexer
# Minimal support for git commands on an hg repository
#
# Copyright 2005, 2006 Chris Mason <mason@suse.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''browse the repository in a graphical way
The hgk extension allows browsing the history of a repository in a
graphical way. It requires Tcl/Tk version 8.4 or later. (Tcl/Tk is not
distributed with Mercurial.)
hgk consists of two parts: a Tcl script that does the displaying and
querying of information, and an extension to Mercurial named hgk.py,
which provides hooks for hgk to get information. hgk can be found in
the contrib directory, and the extension is shipped in the hgext
repository, and needs to be enabled.
The :hg:`view` command will launch the hgk Tcl script. For this command
to work, hgk must be in your search path. Alternately, you can specify
the path to hgk in your configuration file::
[hgk]
path=/location/of/hgk
hgk can make use of the extdiff extension to visualize revisions.
Assuming you had already configured extdiff vdiff command, just add::
[hgk]
vdiff=vdiff
Revisions context menu will now display additional entries to fire
vdiff on hovered and selected revisions.
'''
import os
from mercurial import cmdutil, commands, patch, scmutil, obsolete
from mercurial.node import nullid, nullrev, short
from mercurial.i18n import _
cmdtable = {}
command = cmdutil.command(cmdtable)
# Note for extension authors: ONLY specify testedwith = 'internal' for
# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'internal'
@command('debug-diff-tree',
[('p', 'patch', None, _('generate patch')),
('r', 'recursive', None, _('recursive')),
('P', 'pretty', None, _('pretty')),
('s', 'stdin', None, _('stdin')),
('C', 'copy', None, _('detect copies')),
('S', 'search', "", _('search'))],
('[OPTION]... NODE1 NODE2 [FILE]...'),
inferrepo=True)
def difftree(ui, repo, node1=None, node2=None, *files, **opts):
"""diff trees from two commits"""
def __difftree(repo, node1, node2, files=[]):
assert node2 is not None
mmap = repo[node1].manifest()
mmap2 = repo[node2].manifest()
m = scmutil.match(repo[node1], files)
modified, added, removed = repo.status(node1, node2, m)[:3]
empty = short(nullid)
for f in modified:
# TODO get file permissions
ui.write(":100664 100664 %s %s M\t%s\t%s\n" %
(short(mmap[f]), short(mmap2[f]), f, f))
for f in added:
ui.write(":000000 100664 %s %s N\t%s\t%s\n" %
(empty, short(mmap2[f]), f, f))
for f in removed:
ui.write(":100664 000000 %s %s D\t%s\t%s\n" %
(short(mmap[f]), empty, f, f))
##
while True:
if opts['stdin']:
try:
line = raw_input().split(' ')
node1 = line[0]
if len(line) > 1:
node2 = line[1]
else:
node2 = None
except EOFError:
break
node1 = repo.lookup(node1)
if node2:
node2 = repo.lookup(node2)
else:
node2 = node1
node1 = repo.changelog.parents(node1)[0]
if opts['patch']:
if opts['pretty']:
catcommit(ui, repo, node2, "")
m = scmutil.match(repo[node1], files)
diffopts = patch.difffeatureopts(ui)
diffopts.git = True
chunks = patch.diff(repo, node1, node2, match=m,
opts=diffopts)
for chunk in chunks:
ui.write(chunk)
else:
__difftree(repo, node1, node2, files=files)
if not opts['stdin']:
break
def catcommit(ui, repo, n, prefix, ctx=None):
nlprefix = '\n' + prefix
if ctx is None:
ctx = repo[n]
# use ctx.node() instead ??
ui.write(("tree %s\n" % short(ctx.changeset()[0])))
for p in ctx.parents():
ui.write(("parent %s\n" % p))
date = ctx.date()
description = ctx.description().replace("\0", "")
ui.write(("author %s %s %s\n" % (ctx.user(), int(date[0]), date[1])))
if 'committer' in ctx.extra():
ui.write(("committer %s\n" % ctx.extra()['committer']))
ui.write(("revision %d\n" % ctx.rev()))
ui.write(("branch %s\n" % ctx.branch()))
if obsolete.isenabled(repo, obsolete.createmarkersopt):
if ctx.obsolete():
ui.write(("obsolete\n"))
ui.write(("phase %s\n\n" % ctx.phasestr()))
if prefix != "":
ui.write("%s%s\n" % (prefix,
description.replace('\n', nlprefix).strip()))
else:
ui.write(description + "\n")
if prefix:
ui.write('\0')
@command('debug-merge-base', [], _('REV REV'))
def base(ui, repo, node1, node2):
"""output common ancestor information"""
node1 = repo.lookup(node1)
node2 = repo.lookup(node2)
n = repo.changelog.ancestor(node1, node2)
ui.write(short(n) + "\n")
@command('debug-cat-file',
[('s', 'stdin', None, _('stdin'))],
_('[OPTION]... TYPE FILE'),
inferrepo=True)
def catfile(ui, repo, type=None, r=None, **opts):
"""cat a specific revision"""
# in stdin mode, every line except the commit is prefixed with two
# spaces. This way the our caller can find the commit without magic
# strings
#
prefix = ""
if opts['stdin']:
try:
(type, r) = raw_input().split(' ')
prefix = " "
except EOFError:
return
else:
if not type or not r:
ui.warn(_("cat-file: type or revision not supplied\n"))
commands.help_(ui, 'cat-file')
while r:
if type != "commit":
ui.warn(_("aborting hg cat-file only understands commits\n"))
return 1
n = repo.lookup(r)
catcommit(ui, repo, n, prefix)
if opts['stdin']:
try:
(type, r) = raw_input().split(' ')
except EOFError:
break
else:
break
# git rev-tree is a confusing thing. You can supply a number of
# commit sha1s on the command line, and it walks the commit history
# telling you which commits are reachable from the supplied ones via
# a bitmask based on arg position.
# you can specify a commit to stop at by starting the sha1 with ^
def revtree(ui, args, repo, full="tree", maxnr=0, parents=False):
def chlogwalk():
count = len(repo)
i = count
l = [0] * 100
chunk = 100
while True:
if chunk > i:
chunk = i
i = 0
else:
i -= chunk
for x in xrange(chunk):
if i + x >= count:
l[chunk - x:] = [0] * (chunk - x)
break
if full is not None:
if (i + x) in repo:
l[x] = repo[i + x]
l[x].changeset() # force reading
else:
if (i + x) in repo:
l[x] = 1
for x in xrange(chunk - 1, -1, -1):
if l[x] != 0:
yield (i + x, full is not None and l[x] or None)
if i == 0:
break
# calculate and return the reachability bitmask for sha
def is_reachable(ar, reachable, sha):
if len(ar) == 0:
return 1
mask = 0
for i in xrange(len(ar)):
if sha in reachable[i]:
mask |= 1 << i
return mask
reachable = []
stop_sha1 = []
want_sha1 = []
count = 0
# figure out which commits they are asking for and which ones they
# want us to stop on
for i, arg in enumerate(args):
if arg.startswith('^'):
s = repo.lookup(arg[1:])
stop_sha1.append(s)
want_sha1.append(s)
elif arg != 'HEAD':
want_sha1.append(repo.lookup(arg))
# calculate the graph for the supplied commits
for i, n in enumerate(want_sha1):
reachable.append(set())
visit = [n]
reachable[i].add(n)
while visit:
n = visit.pop(0)
if n in stop_sha1:
continue
for p in repo.changelog.parents(n):
if p not in reachable[i]:
reachable[i].add(p)
visit.append(p)
if p in stop_sha1:
continue
# walk the repository looking for commits that are in our
# reachability graph
for i, ctx in chlogwalk():
if i not in repo:
continue
n = repo.changelog.node(i)
mask = is_reachable(want_sha1, reachable, n)
if mask:
parentstr = ""
if parents:
pp = repo.changelog.parents(n)
if pp[0] != nullid:
parentstr += " " + short(pp[0])
if pp[1] != nullid:
parentstr += " " + short(pp[1])
if not full:
ui.write("%s%s\n" % (short(n), parentstr))
elif full == "commit":
ui.write("%s%s\n" % (short(n), parentstr))
catcommit(ui, repo, n, ' ', ctx)
else:
(p1, p2) = repo.changelog.parents(n)
(h, h1, h2) = map(short, (n, p1, p2))
(i1, i2) = map(repo.changelog.rev, (p1, p2))
date = ctx.date()[0]
ui.write("%s %s:%s" % (date, h, mask))
mask = is_reachable(want_sha1, reachable, p1)
if i1 != nullrev and mask > 0:
ui.write("%s:%s " % (h1, mask)),
mask = is_reachable(want_sha1, reachable, p2)
if i2 != nullrev and mask > 0:
ui.write("%s:%s " % (h2, mask))
ui.write("\n")
if maxnr and count >= maxnr:
break
count += 1
# git rev-list tries to order things by date, and has the ability to stop
# at a given commit without walking the whole repo. TODO add the stop
# parameter
@command('debug-rev-list',
[('H', 'header', None, _('header')),
('t', 'topo-order', None, _('topo-order')),
('p', 'parents', None, _('parents')),
('n', 'max-count', 0, _('max-count'))],
('[OPTION]... REV...'))
def revlist(ui, repo, *revs, **opts):
"""print revisions"""
if opts['header']:
full = "commit"
else:
full = None
copy = [x for x in revs]
revtree(ui, copy, repo, full, opts['max_count'], opts['parents'])
@command('view',
[('l', 'limit', '',
_('limit number of changes displayed'), _('NUM'))],
_('[-l LIMIT] [REVRANGE]'))
def view(ui, repo, *etc, **opts):
"start interactive history viewer"
os.chdir(repo.root)
optstr = ' '.join(['--%s %s' % (k, v) for k, v in opts.iteritems() if v])
if repo.filtername is None:
optstr += '--hidden'
cmd = ui.config("hgk", "path", "hgk") + " %s %s" % (optstr, " ".join(etc))
ui.debug("running %s\n" % cmd)
ui.system(cmd)