parents: correct help revset replacements
Implementing `hg parents -r REV FILE` correctly is hard.
The output can be 0, 1, or 2 revs.
First, you can't use parents(), because it sorts its output...
Consider:
echo $a
echo par@rev: `hg log -r "parents($a)" -q`
echo p12@rev: `hg log -r "p1($a)+p2($a)" -q`
echo parents: `hg parents -q -r $a`
(Merge 1 into 0)
3
par@rev: 0:d9612eafe8ec 1:070fe4290d06
p12@rev: 0:d9612eafe8ec 1:070fe4290d06
parents: 0:d9612eafe8ec 1:070fe4290d06
(Merge 4 into 5)
6
par@rev: 4:db73392995c3 5:c26e7dd67644
p12@rev: 5:c26e7dd67644 4:db73392995c3
parents: 5:c26e7dd67644 4:db73392995c3
(Merge 7 into 8)
9
par@rev: 7:d84f47462f70 8:9597bcab36e0
p12@rev: 8:9597bcab36e0 7:d84f47462f70
parents: 8:9597bcab36e0 7:d84f47462f70
You also can't use parents or/p1/p2 alone with a set, as in:
-r "parents(::REV and file(FILE))"
-r "parents(::REV - REV and file(FILE))"
... because each will return all parents for each candidate revision,
and the :: gives too many candidates.
Thus, we need a max and a p1/p2.
Also, anything of this form:
max(::REV - REV and file(FILE))
... is wrong, because max will return only one revision, and for
a proper parents, you need to return two occasionally.
Lastly, it doesn't help that `hg parents -r REV FILE` is buggy
due to a quirk in filelogs.
Here's a repository to consider when evaluating whether your
revset is correct:
$ hg log -G --template '{rev} {files}\n';
@ 10 a
|
o 9 a b
|\
| o 8 a
| |
o | 7 a
| |
+---o 6 b
| |/
| o 5 b
| |
o | 4 b
| |
+---o 3
| |/
+---o 2
| |/
| o 1 b
|
o 0 a
revs 4 and 5 create a conflict.
The conflict is resolved in the same way by both 6 and 9.
You would hope that parents around 9/10 would point to 9,
but `hg parents` will point to 6 due to the aforementioned bug.
Here's the winning solution test script and its output.
echo $a;
echo rp12-max: `hg log -r "max(::p1($a) and file(b)) + max(::p2($a) and file(b))" -q` 2> /dev/null;
echo expected: `hg parents -q -r $a b` 2> /dev/null;
Note that for 10, the output differs, but again, this is because
of the aforementioned bug. The rp12-max output is "correct",
whereas "expected" is just an unfortunate bug. The abort output
is due to something else. I'm not sure why someone thought it
was important to abort to stdio instead of stderr, but that's
really not my problem here.
10
rp12-max: 9:184ebefc2fce
expected: 6:dd558142b03f
9
rp12-max: 5:c26e7dd67644 4:db73392995c3
expected: 5:c26e7dd67644 4:db73392995c3
8
rp12-max: 5:c26e7dd67644
expected: 5:c26e7dd67644
7
rp12-max: 4:db73392995c3
expected: 4:db73392995c3
6
rp12-max: 5:c26e7dd67644 4:db73392995c3
expected: 5:c26e7dd67644 4:db73392995c3
5
rp12-max: 1:070fe4290d06
expected: 1:070fe4290d06
4
rp12-max:
abort: 'b' not found in manifest!
expected:
3
rp12-max: 1:070fe4290d06
expected: 1:070fe4290d06
2
rp12-max: 1:070fe4290d06
expected: 1:070fe4290d06
1
rp12-max:
abort: 'b' not found in manifest!
expected:
0
rp12-max:
abort: 'b' not found in manifest!
expected:
# acl.py - changeset access control for mercurial
#
# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''hooks for controlling repository access
This hook makes it possible to allow or deny write access to given
branches and paths of a repository when receiving incoming changesets
via pretxnchangegroup and pretxncommit.
The authorization is matched based on the local user name on the
system where the hook runs, and not the committer of the original
changeset (since the latter is merely informative).
The acl hook is best used along with a restricted shell like hgsh,
preventing authenticating users from doing anything other than pushing
or pulling. The hook is not safe to use if users have interactive
shell access, as they can then disable the hook. Nor is it safe if
remote users share an account, because then there is no way to
distinguish them.
The order in which access checks are performed is:
1) Deny list for branches (section ``acl.deny.branches``)
2) Allow list for branches (section ``acl.allow.branches``)
3) Deny list for paths (section ``acl.deny``)
4) Allow list for paths (section ``acl.allow``)
The allow and deny sections take key-value pairs.
Branch-based Access Control
---------------------------
Use the ``acl.deny.branches`` and ``acl.allow.branches`` sections to
have branch-based access control. Keys in these sections can be
either:
- a branch name, or
- an asterisk, to match any branch;
The corresponding values can be either:
- a comma-separated list containing users and groups, or
- an asterisk, to match anyone;
You can add the "!" prefix to a user or group name to invert the sense
of the match.
Path-based Access Control
-------------------------
Use the ``acl.deny`` and ``acl.allow`` sections to have path-based
access control. Keys in these sections accept a subtree pattern (with
a glob syntax by default). The corresponding values follow the same
syntax as the other sections above.
Groups
------
Group names must be prefixed with an ``@`` symbol. Specifying a group
name has the same effect as specifying all the users in that group.
You can define group members in the ``acl.groups`` section.
If a group name is not defined there, and Mercurial is running under
a Unix-like system, the list of users will be taken from the OS.
Otherwise, an exception will be raised.
Example Configuration
---------------------
::
[hooks]
# Use this if you want to check access restrictions at commit time
pretxncommit.acl = python:hgext.acl.hook
# Use this if you want to check access restrictions for pull, push,
# bundle and serve.
pretxnchangegroup.acl = python:hgext.acl.hook
[acl]
# Allow or deny access for incoming changes only if their source is
# listed here, let them pass otherwise. Source is "serve" for all
# remote access (http or ssh), "push", "pull" or "bundle" when the
# related commands are run locally.
# Default: serve
sources = serve
[acl.deny.branches]
# Everyone is denied to the frozen branch:
frozen-branch = *
# A bad user is denied on all branches:
* = bad-user
[acl.allow.branches]
# A few users are allowed on branch-a:
branch-a = user-1, user-2, user-3
# Only one user is allowed on branch-b:
branch-b = user-1
# The super user is allowed on any branch:
* = super-user
# Everyone is allowed on branch-for-tests:
branch-for-tests = *
[acl.deny]
# This list is checked first. If a match is found, acl.allow is not
# checked. All users are granted access if acl.deny is not present.
# Format for both lists: glob pattern = user, ..., @group, ...
# To match everyone, use an asterisk for the user:
# my/glob/pattern = *
# user6 will not have write access to any file:
** = user6
# Group "hg-denied" will not have write access to any file:
** = @hg-denied
# Nobody will be able to change "DONT-TOUCH-THIS.txt", despite
# everyone being able to change all other files. See below.
src/main/resources/DONT-TOUCH-THIS.txt = *
[acl.allow]
# if acl.allow is not present, all users are allowed by default
# empty acl.allow = no users allowed
# User "doc_writer" has write access to any file under the "docs"
# folder:
docs/** = doc_writer
# User "jack" and group "designers" have write access to any file
# under the "images" folder:
images/** = jack, @designers
# Everyone (except for "user6" and "@hg-denied" - see acl.deny above)
# will have write access to any file under the "resources" folder
# (except for 1 file. See acl.deny):
src/main/resources/** = *
.hgtags = release_engineer
Examples using the "!" prefix
.............................
Suppose there's a branch that only a given user (or group) should be able to
push to, and you don't want to restrict access to any other branch that may
be created.
The "!" prefix allows you to prevent anyone except a given user or group to
push changesets in a given branch or path.
In the examples below, we will:
1) Deny access to branch "ring" to anyone but user "gollum"
2) Deny access to branch "lake" to anyone but members of the group "hobbit"
3) Deny access to a file to anyone but user "gollum"
::
[acl.allow.branches]
# Empty
[acl.deny.branches]
# 1) only 'gollum' can commit to branch 'ring';
# 'gollum' and anyone else can still commit to any other branch.
ring = !gollum
# 2) only members of the group 'hobbit' can commit to branch 'lake';
# 'hobbit' members and anyone else can still commit to any other branch.
lake = !@hobbit
# You can also deny access based on file paths:
[acl.allow]
# Empty
[acl.deny]
# 3) only 'gollum' can change the file below;
# 'gollum' and anyone else can still change any other file.
/misty/mountains/cave/ring = !gollum
'''
from mercurial.i18n import _
from mercurial import util, match, error
import getpass, urllib
# 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'
def _getusers(ui, group):
# First, try to use group definition from section [acl.groups]
hgrcusers = ui.configlist('acl.groups', group)
if hgrcusers:
return hgrcusers
ui.debug('acl: "%s" not defined in [acl.groups]\n' % group)
# If no users found in group definition, get users from OS-level group
try:
return util.groupmembers(group)
except KeyError:
raise error.Abort(_("group '%s' is undefined") % group)
def _usermatch(ui, user, usersorgroups):
if usersorgroups == '*':
return True
for ug in usersorgroups.replace(',', ' ').split():
if ug.startswith('!'):
# Test for excluded user or group. Format:
# if ug is a user name: !username
# if ug is a group name: !@groupname
ug = ug[1:]
if not ug.startswith('@') and user != ug \
or ug.startswith('@') and user not in _getusers(ui, ug[1:]):
return True
# Test for user or group. Format:
# if ug is a user name: username
# if ug is a group name: @groupname
elif user == ug \
or ug.startswith('@') and user in _getusers(ui, ug[1:]):
return True
return False
def buildmatch(ui, repo, user, key):
'''return tuple of (match function, list enabled).'''
if not ui.has_section(key):
ui.debug('acl: %s not enabled\n' % key)
return None
pats = [pat for pat, users in ui.configitems(key)
if _usermatch(ui, user, users)]
ui.debug('acl: %s enabled, %d entries for user %s\n' %
(key, len(pats), user))
# Branch-based ACL
if not repo:
if pats:
# If there's an asterisk (meaning "any branch"), always return True;
# Otherwise, test if b is in pats
if '*' in pats:
return util.always
return lambda b: b in pats
return util.never
# Path-based ACL
if pats:
return match.match(repo.root, '', pats)
return util.never
def hook(ui, repo, hooktype, node=None, source=None, **kwargs):
if hooktype not in ['pretxnchangegroup', 'pretxncommit']:
raise error.Abort(_('config error - hook type "%s" cannot stop '
'incoming changesets nor commits') % hooktype)
if (hooktype == 'pretxnchangegroup' and
source not in ui.config('acl', 'sources', 'serve').split()):
ui.debug('acl: changes have source "%s" - skipping\n' % source)
return
user = None
if source == 'serve' and 'url' in kwargs:
url = kwargs['url'].split(':')
if url[0] == 'remote' and url[1].startswith('http'):
user = urllib.unquote(url[3])
if user is None:
user = getpass.getuser()
ui.debug('acl: checking access for user "%s"\n' % user)
# deprecated config: acl.config
cfg = ui.config('acl', 'config')
if cfg:
ui.readconfig(cfg, sections=['acl.groups', 'acl.allow.branches',
'acl.deny.branches', 'acl.allow', 'acl.deny'])
allowbranches = buildmatch(ui, None, user, 'acl.allow.branches')
denybranches = buildmatch(ui, None, user, 'acl.deny.branches')
allow = buildmatch(ui, repo, user, 'acl.allow')
deny = buildmatch(ui, repo, user, 'acl.deny')
for rev in xrange(repo[node], len(repo)):
ctx = repo[rev]
branch = ctx.branch()
if denybranches and denybranches(branch):
raise error.Abort(_('acl: user "%s" denied on branch "%s"'
' (changeset "%s")')
% (user, branch, ctx))
if allowbranches and not allowbranches(branch):
raise error.Abort(_('acl: user "%s" not allowed on branch "%s"'
' (changeset "%s")')
% (user, branch, ctx))
ui.debug('acl: branch access granted: "%s" on branch "%s"\n'
% (ctx, branch))
for f in ctx.files():
if deny and deny(f):
raise error.Abort(_('acl: user "%s" denied on "%s"'
' (changeset "%s")') % (user, f, ctx))
if allow and not allow(f):
raise error.Abort(_('acl: user "%s" not allowed on "%s"'
' (changeset "%s")') % (user, f, ctx))
ui.debug('acl: path access granted: "%s"\n' % ctx)