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PhabricatorRepositoryMercurialCommitDiscoveryDaemon.php
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Created
Fri, Jul 19, 18:16
Size
4 KB
Mime Type
text/x-php
Expires
Sun, Jul 21, 18:16 (2 d)
Engine
blob
Format
Raw Data
Handle
19164641
Attached To
rPH Phabricator
PhabricatorRepositoryMercurialCommitDiscoveryDaemon.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
class
PhabricatorRepositoryMercurialCommitDiscoveryDaemon
extends
PhabricatorRepositoryCommitDiscoveryDaemon
{
protected
function
discoverCommits
()
{
$repository
=
$this
->
getRepository
();
$vcs
=
$repository
->
getVersionControlSystem
();
if
(
$vcs
!=
PhabricatorRepositoryType
::
REPOSITORY_TYPE_MERCURIAL
)
{
throw
new
Exception
(
"Repository is not a Mercurial repository."
);
}
$repository_phid
=
$repository
->
getPHID
();
list
(
$stdout
)
=
$repository
->
execxLocalCommand
(
'branches'
);
$branches
=
ArcanistMercurialParser
::
parseMercurialBranches
(
$stdout
);
$got_something
=
false
;
foreach
(
$branches
as
$name
=>
$branch
)
{
$commit
=
$branch
[
'rev'
];
$commit
=
$this
->
getFullHash
(
$commit
);
if
(
$this
->
isKnownCommit
(
$commit
))
{
continue
;
}
else
{
$this
->
discoverCommit
(
$commit
);
$got_something
=
true
;
}
}
return
$got_something
;
}
private
function
getFullHash
(
$commit
)
{
// NOTE: Mercurial shortens hashes to 12 characters by default. This
// implies collisions with as few as a few million commits. The
// documentation sensibly advises "Do not use short-form IDs for
// long-lived representations". It then continues "You can use the
// --debug option to display the full changeset ID". What?! Yes, this
// is in fact the only way to turn on full hashes, and the hg source
// code is littered with "hexfn = ui.debugflag and hex or short" and
// similar. There is no more-selective flag or config option.
//
// Unfortunately, "hg --debug" turns on tons of other extra output,
// including full commit messages in "hg log" and "hg parents" (which
// ignore --style); this renders them unparseable. So we have to use
// "hg id" to convert short hashes into full hashes. See:
//
// <http://mercurial.selenic.com/wiki/ChangeSetID>
//
// Of course, this means that if there are collisions we will break here
// (the short commit identifier won't be unambiguous) but maybe Mercurial
// will have a --full-hashes flag or something by then and we can fix it
// properly. Until we run into that, this allows us to store data in the
// right format so when we eventually encounter this we won't have to
// reparse every Mercurial repository.
$repository
=
$this
->
getRepository
();
list
(
$stdout
)
=
$repository
->
execxLocalCommand
(
'id --debug -i --rev %s'
,
$commit
);
return
trim
(
$stdout
);
}
private
function
discoverCommit
(
$commit
)
{
$discover
=
array
();
$insert
=
array
();
$repository
=
$this
->
getRepository
();
$discover
[]
=
$commit
;
$insert
[]
=
$commit
;
$seen_parent
=
array
();
// For all the new commits at the branch heads, walk backward until we find
// only commits we've aleady seen.
while
(
true
)
{
$target
=
array_pop
(
$discover
);
list
(
$stdout
)
=
$repository
->
execxLocalCommand
(
'parents --style default --rev %s'
,
$target
);
$parents
=
ArcanistMercurialParser
::
parseMercurialLog
(
$stdout
);
if
(
$parents
)
{
foreach
(
$parents
as
$parent
)
{
$parent_commit
=
$parent
[
'rev'
];
$parent_commit
=
$this
->
getFullHash
(
$parent_commit
);
if
(
isset
(
$seen_parent
[
$parent_commit
]))
{
continue
;
}
$seen_parent
[
$parent_commit
]
=
true
;
if
(!
$this
->
isKnownCommit
(
$parent_commit
))
{
$discover
[]
=
$parent_commit
;
$insert
[]
=
$parent_commit
;
}
}
}
if
(
empty
(
$discover
))
{
break
;
}
$this
->
stillWorking
();
}
while
(
true
)
{
$target
=
array_pop
(
$insert
);
list
(
$stdout
)
=
$repository
->
execxLocalCommand
(
'log --rev %s --template %s'
,
$target
,
'{date|rfc822date}'
);
$epoch
=
strtotime
(
$stdout
);
$this
->
recordCommit
(
$target
,
$epoch
);
if
(
empty
(
$insert
))
{
break
;
}
}
}
}
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