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Code Issues Releases Wiki Activity

Allow branch deletions to be pushed in Mercurial

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Summary: Fixes T5050. This might not be 100% right in all edge cases, but it worked on everything I tried.

Test Plan:
  - Pushed a branch deletion.
  - Pushed a branch creation.
  - Pushed a brnach creation + deletion.
  - Pushed a brnach deletion + creation.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5050

Differential Revision: https://secure.phabricator.com/D9122
This commit is contained in:
epriestley 2014-05-14 16:59:15 -07:00
parent fe0c98facc
commit 0ad0669916
1 changed files with 49 additions and 24 deletions
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73
src/applications/diffusion/engine/DiffusionCommitHookEngine.php
View file

@ -730,35 +730,29 @@ final class DiffusionCommitHookEngine extends Phobject {
sort($old_heads);
sort($new_heads);
if (!$old_heads && !$new_heads) {
// This should never be possible, as it makes no sense. Explode.
throw new Exception(
pht(
'Mercurial repository has no new or old heads for branch "%s" '.
'after push. This makes no sense; rejecting change.',
$ref));
}
if ($old_heads === $new_heads) {
// No changes to this branch, so skip it.
continue;
}
if (!$new_heads) {
if ($old_heads) {
// TODO: This comment is wrong, and branches can be deleted with
// --close-branch. Fix it soon: see T5050.
// It looks like this push deletes a branch, but that isn't possible
// in Mercurial, so something is going wrong here. Bail out.
throw new Exception(
pht(
'Mercurial repository has no new head for branch "%s" after '.
'push. This is unexpected; rejecting change.',
$ref));
} else {
// Obviously, this should never be possible either, as it makes
// no sense. Explode.
throw new Exception(
pht(
'Mercurial repository has no new or old heads for branch "%s" '.
'after push. This makes no sense; rejecting change.',
$ref));
}
}
$stray_heads = array();
if (count($old_heads) > 1) {
if ($old_heads && !$new_heads) {
// This is a branch deletion with "--close-branch".
$head_map = array();
foreach ($old_heads as $old_head) {
$head_map[$old_head] = array(self::EMPTY_HASH);
}
} else if (count($old_heads) > 1) {
// HORRIBLE: In Mercurial, branches can have multiple heads. If the
// old branch had multiple heads, we need to figure out which new
// heads descend from which old heads, so we can tell whether you're
@ -777,13 +771,24 @@ final class DiffusionCommitHookEngine extends Phobject {
$head_map = array();
foreach (Futures($dfutures) as $future_head => $dfuture) {
list($stdout) = $dfuture->resolvex();
$head_map[$future_head] = array_filter(explode("\1", $stdout));
$descendant_heads = array_filter(explode("\1", $stdout));
if ($descendant_heads) {
// This old head has at least one descendant in the push.
$head_map[$future_head] = $descendant_heads;
} else {
// This old head has no descendants, so it is being deleted.
$head_map[$future_head] = array(self::EMPTY_HASH);
}
}
// Now, find all the new stray heads this push creates, if any. These
// are new heads which do not descend from the old heads.
$seen = array_fuse(array_mergev($head_map));
foreach ($new_heads as $new_head) {
if ($new_head === self::EMPTY_HASH) {
// If a branch head is being deleted, don't insert it as an add.
continue;
}
if (empty($seen[$new_head])) {
$head_map[self::EMPTY_HASH][] = $new_head;
}
@ -808,6 +813,8 @@ final class DiffusionCommitHookEngine extends Phobject {
$ref_flags |= PhabricatorRepositoryPushLog::CHANGEFLAG_APPEND;
}
$deletes_existing_head = ($new_head == self::EMPTY_HASH);
$splits_existing_head = (count($child_heads) > 1);
$creates_duplicate_head = ($old_head == self::EMPTY_HASH) &&
(count($head_map) > 1);
@ -844,6 +851,19 @@ final class DiffusionCommitHookEngine extends Phobject {
}
}
if ($deletes_existing_head) {
// TODO: Somewhere in here we should be setting CHANGEFLAG_REWRITE
// if we are also creating at least one other head to replace
// this one.
// NOTE: In Git, this is a dangerous change, but it is not dangerous
// in Mercurial. Mercurial branches are version controlled, and
// Mercurial does not prompt you for any special flags when pushing
// a `--close-branch` commit by default.
$ref_flags |= PhabricatorRepositoryPushLog::CHANGEFLAG_DELETE;
}
$ref_update = $this->newPushLog()
->setRefType(PhabricatorRepositoryPushLog::REFTYPE_BRANCH)
->setRefName($ref)
@ -1084,6 +1104,11 @@ final class DiffusionCommitHookEngine extends Phobject {
$byte_limit));
}
if (!strlen($raw_diff)) {
// If the commit is actually empty, just return no changesets.
return array();
}
$parser = new ArcanistDiffParser();
$changes = $parser->parseDiff($raw_diff);
$diff = DifferentialDiff::newFromRawChanges($changes);