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add arc land hg support for landing with nested branches

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Summary:
This changes arc land's hg support to allow you to land a branch or bookmark that has nested branches/bookmarks.  Example:

      // Initial state:
      // -a--------b  master
      //   \
      //    w--x  mybranch
      //        \--y  subbranch1
      //         \--z  subbranch2
      //
      // arc land --branch mybranch --onto master :
      // -a--b--wx  master
      //          \--y  subbranch1
      //           \--z  subbranch2

Test Plan:
Created several repos like in the summary and ran 'arc land' and 'arc land --keep-branch'. Did this with both bookmarks and named branches. Scenarios tested:

- mybranch having no child commits
- mybranch having a child branch with several commits
- mybranch having two child branches
- mybranch having a child branch which has two more child branches

No code was added outside of a "if ($this->isHg)" so I didn't run git arc land.

Reviewers: epriestley, dschleimer, bos, sid0

Reviewed By: dschleimer

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4089
This commit is contained in:
durham 2012-12-05 19:31:25 -08:00
parent 2d7224f0e3
commit f476d1a0c5
1 changed files with 143 additions and 17 deletions
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160
src/workflow/ArcanistLandWorkflow.php
View file

@ -499,14 +499,48 @@ EOTEXT
$this->branch);
}
else if ($this->isHg) {
// The hg code is a little more complex than git's because we
// need to handle the case where the landing branch has child branches:
// -a--------b master
// \
// w--x mybranch
// \--y subbranch1
// \--z subbranch2
//
// arc land --branch mybranch --onto master :
// -a--b--wx master
// \--y subbranch1
// \--z subbranch2
$branch_rev_id = $repository_api->getCanonicalRevisionName($this->branch);
// At this point $this->onto has been pulled from remote and
// $this->branch has been rebased on top of onto(by the rebase()
// function). So we're guaranteed to have onto as an ancestor of branch
// when we use first((onto::branch)-onto) below.
$branch_root = $repository_api->getCanonicalRevisionName(
sprintf("first((%s::%s)-%s)",
$this->onto,
$this->branch,
$this->onto));
$branch_range = sprintf(
"(%s::%s)",
$branch_root,
$this->branch);
if (!$this->keepBranch) {
$this->handleAlternateBranches($branch_root, $branch_range);
}
// Collapse just the landing branch onto master.
// Leave its children on the original branch.
$repository_api->execxLocal(
'rebase --collapse --logfile %s -b %s -d %s %s',
'rebase --collapse --keep --logfile %s -r %s -d %s',
$this->messageFile,
$this->branch,
$this->onto,
$this->keepBranch ? '--keep' : '');
$branch_range,
$this->onto);
if ($repository_api->isBookmark($this->branch)) {
// a bug in mercurial means bookmarks end up on the revision prior
// to the collapse when using --collapse with --keep,
@ -516,13 +550,113 @@ EOTEXT
'bookmark -f %s',
$this->onto);
if ($this->keepBranch) {
$repository_api->execxLocal(
'bookmark -f %s -r %s',
$this->branch,
$branch_rev_id);
}
// check if the branch had children
list($output) = $repository_api->execxLocal(
"log -r %s --template '{node}\\n'",
sprintf("children(%s)", $this->branch));
$child_branch_roots = phutil_split_lines($output, false);
$child_branch_roots = array_filter($child_branch_roots);
if ($child_branch_roots) {
// move the branch's children onto the collapsed commit
foreach ($child_branch_roots as $child_root) {
$repository_api->execxLocal(
'bookmark -f %s -r %s',
$this->branch,
$branch_rev_id);
'rebase -d %s -s %s --keep --keepbranches',
$this->onto,
$child_root);
}
}
// delete the old branch if necessary
if (!$this->keepBranch) {
$repository_api->execxLocal(
'strip -r %s',
$branch_root);
if ($repository_api->isBookmark($this->branch)) {
$repository_api->execxLocal(
'bookmark -d %s',
$this->branch);
}
}
// All the rebases may have moved us to another branch
// so we move back.
$repository_api->execxLocal('checkout %s', $this->onto);
}
}
/**
* Detect alternate branches and prompt the user for how to handle
* them. An alternate branch is a branch that forks from the landing
* branch prior to the landing branch tip.
*
* In a situation like this:
* -a--------b master
* \
* w--x landingbranch
* \ \-- g subbranch
* \--y altbranch1
* \--z altbranch2
*
* y and z are alternate branches and will get deleted by the squash,
* so we need to detect them and ask the user what they want to do.
*
* @param string The revision id of the landing branch's root commit.
* @param string The revset specifying all the commits in the landing branch.
* @return void
*/
private function handleAlternateBranches($branch_root, $branch_range) {
$repository_api = $this->getRepositoryAPI();
// Using the tree in the doccomment, the revset below resolves as follows:
// 1. roots(descendants(w) - descendants(x) - (w::x))
// 2. roots({x,g,y,z} - {g} - {w,x})
// 3. roots({y,z})
// 4. {y,z}
$alt_branch_revset = sprintf(
'roots(descendants(%s)-descendants(%s)-%s)',
$branch_root,
$this->branch,
$branch_range);
list($alt_branches) = $repository_api->execxLocal(
"log --template '{node}\n' -r %s",
$alt_branch_revset);
$alt_branches = phutil_split_lines($alt_branches, false);
$alt_branches = array_filter($alt_branches);
$alt_count = count($alt_branches);
if ($alt_count > 0) {
$input = phutil_console_prompt(
"Branch {$this->branch} has {$alt_count} branch(s) forking off of it ".
"that would be deleted during a squash. Would you like to keep a ".
"non-squashed copy, rebase them on top of {$this->branch}, or abort ".
"and deal with them yourself? (k)eep, (r)ebase, (a)bort:");
if ($input == 'k' || $input == 'keep') {
$this->keepBranch = true;
} else if ($input == 'r' || $input == 'rebase') {
foreach ($alt_branches as $alt_branch) {
$repository_api->execxLocal(
'rebase --keep --keepbranches -d %s -s %s',
$this->branch,
$alt_branch);
}
} else if ($input == 'a' || $input == 'abort') {
$branch_string = implode("\n", $alt_branches);
echo "\nRemove the branches starting at these revision and ".
"run arc land again:\n{$branch_string}\n\n";
throw new ArcanistUserAbortException();
} else {
throw new ArcanistUsageException("Invalid choice. Aborting arc land.");
}
}
}
@ -636,15 +770,7 @@ EOTEXT
'branch -D %s',
$this->branch);
}
else if ($this->isHg) {
// named branches were closed as part of the earlier commit
// so only worry about bookmarks
if ($repository_api->isBookmark($this->branch)) {
$repository_api->execxLocal(
'bookmark -d %s',
$this->branch);
}
}
// hg branches/bookmarks were closed earlier
if ($this->getArgument('delete-remote')) {
if ($this->isGit) {