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Make arc land for hg more robust to failures

Browse source 
Summary:
Adds error handling for several kinds of failure in arc land for
mercurial.  Previously it would often leave the repo in a confusing state
if something failed.

- Aborts the land if pull brings in a diverged 'onto' branch.
- Aborts the rebase if there is a conflict. This leaves the repo exactly as
it was before, so the user is not left with a half finished rebase.
- Don't delete the original non-squashed branch until the push succeeds.
- If the push fails, strip the temporary squashed commit. This leaves the
'onto' branch back on the latest commit from the server, and leaves the users
original nonsquashed branch around.
- Always leave the user back on their original branch after an error.

Test Plan:
Ran arc land:
- with pull causing a diverged 'onto' bookmark
- with the 'onto' bookmark already diverged
- with the rebase causing conflicts
- with a push that failed due to a commit hook
- with a successful land
- with a successful collapse and land

In all failure cases the repo was left exactly as it was before arc land,
except for the push-failed case, where the only change was that the branch
was correctly on top of the destination branch due to a successful rebase.

Used bookmark name "foo bar-gah" to test that crazy bookmark names still work.

Reviewers: epriestley, dschleimer, sid0

Reviewed By: epriestley

CC: nh, wez, bos, aran, Korvin

Differential Revision: https://secure.phabricator.com/D5394
This commit is contained in:
durham 2013-03-20 15:06:10 -07:00
parent b6e83c7b35
commit 9963323b91
1 changed files with 89 additions and 54 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

125
src/workflow/ArcanistLandWorkflow.php
View file

@ -447,28 +447,17 @@ EOTEXT
"Updating **%s**...\n",
$this->onto);
if ($repository_api->supportsPhases()) {
list($out) = $repository_api->execxLocal(
'log -r %s --template {phase}', $this->onto);
if ($out != 'public') {
$local_ahead_of_remote = true;
}
} else {
// execManual instead of execx because outgoing returns
// code 1 when there is nothing outgoing
list($err, $out) = $repository_api->execManualLocal(
'outgoing -r %s',
$this->onto);
// $err === 0 means something is outgoing
if ($err === 0) {
$local_ahead_of_remote = true;
}
}
if (!$local_ahead_of_remote) {
try {
$repository_api->execxLocal('pull');
list($out, $err) = $repository_api->execxLocal('pull');
$divergedbookmark = $this->onto.'@'.$repository_api->getBranchName();
if (strpos($err, $divergedbookmark) !== false) {
throw new ArcanistUsageException(phutil_console_format(
"Local bookmark **{$this->onto}** has diverged from the ".
"server's **{$this->onto}** (now labeled ".
"**{$divergedbookmark}**). Please resolve this divergence and ".
"run 'arc land' again."));
}
} catch (CommandException $ex) {
$err = $ex->getError();
$stdout = $ex->getStdOut();
@ -491,12 +480,29 @@ EOTEXT
// TODO: Remove this once we're far enough in the future that
// deployment of 2.1 is exceedingly rare?
if ($err == 1 && preg_match('/no changes found/', $stdout)) {
return;
} else {
if ($err != 1 || !preg_match('/no changes found/', $stdout)) {
throw $ex;
}
}
// Pull succeeded. Now make sure master is not on an outgoing change
if ($repository_api->supportsPhases()) {
list($out) = $repository_api->execxLocal(
'log -r %s --template {phase}', $this->onto);
if ($out != 'public') {
$local_ahead_of_remote = true;
}
} else {
// execManual instead of execx because outgoing returns
// code 1 when there is nothing outgoing
list($err, $out) = $repository_api->execManualLocal(
'outgoing -r %s',
$this->onto);
// $err === 0 means something is outgoing
if ($err === 0) {
$local_ahead_of_remote = true;
}
}
}
@ -512,6 +518,11 @@ EOTEXT
private function rebase() {
$repository_api = $this->getRepositoryAPI();
echo phutil_console_format(
"Rebasing **%s** onto **%s**\n",
$this->branch,
$this->onto);
chdir($repository_api->getPath());
if ($this->isGit) {
if ($this->shouldUpdateWithRebase) {
@ -550,12 +561,15 @@ EOTEXT
'rebase -d %s --keepbranches',
$this->onto);
if ($err) {
echo phutil_console_format("Aborting rebase\n");
$repository_api->execManualLocal(
'rebase --abort');
$this->restoreBranch();
throw new ArcanistUsageException(
"'hg rebase {$this->onto}' failed. ".
"You can abort with 'hg rebase --abort', ".
"or resolve conflicts and use 'hg rebase ".
"--continue' to continue forward. After resolving the rebase, ".
"run 'arc land' again.");
"'hg rebase {$this->onto}' failed and the rebase was aborted. ".
"This is most likely due to conflicts. Manually rebase ".
"{$this->branch} onto {$this->onto}, resolve the conflicts, ".
"then run 'arc land' again.");
}
}
}
@ -608,12 +622,21 @@ EOTEXT
// Collapse just the landing branch onto master.
// Leave its children on the original branch.
$repository_api->execxLocal(
$err = $repository_api->execPassthru(
'rebase --collapse --keep --logfile %s -r %s -d %s',
$this->messageFile,
$branch_range,
$this->onto);
if ($err) {
$repository_api->execManualLocal(
'rebase --abort');
$this->restoreBranch();
throw new ArcanistUsageException(
"Squashing the commits under {$this->branch} failed. ".
"Manually squash your commits and run 'arc land' again.");
}
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,
@ -646,19 +669,6 @@ EOTEXT
}
}
// delete the old branch if necessary
if (!$this->keepBranch) {
$repository_api->execxLocal(
'--config extensions.mq= 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', $this->onto);
@ -853,10 +863,15 @@ EOTEXT
}
private function executeCleanupAfterFailedPush() {
if ($this->isGit) {
$repository_api = $this->getRepositoryAPI();
if ($this->isGit) {
$repository_api->execxLocal('reset --hard HEAD^');
$this->restoreBranch();
} else if ($this->isHg) {
$repository_api->execxLocal(
'--config extensions.mq= strip %s',
$this->onto);
$this->restoreBranch();
}
}
@ -877,8 +892,28 @@ EOTEXT
$repository_api->execxLocal(
'branch -D %s',
$this->branch);
} else if ($this->isHg) {
$common_ancestor = $repository_api->getCanonicalRevisionName(
hgsprintf("ancestor(%s,%s)",
$this->onto,
$this->branch));
$branch_root = $repository_api->getCanonicalRevisionName(
hgsprintf("first((%s::%s)-%s)",
$common_ancestor,
$this->branch,
$common_ancestor));
$repository_api->execxLocal(
'--config extensions.mq= strip -r %s',
$branch_root);
if ($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) {