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Reduce the strength of "arc executing on arc" from an error to a warning

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Summary:
See PHI13. This was introduced a very, very long time ago in D311 and D312, and I think T168 was the original report.

It prevents `arc` from being used in some semi-reasonable (maybe?) automation workflows where you're hooking some version of "Land Revision" up to `arc land`. This isn't necessarily the right approach, but I think the concession here to make this work is small.

Running `arc` against another copy of `arc` makes `arc unit` not work, but we provide a good error message. Most other `arc` operations still work correctly.

All of these situations are bizarre edge cases but I think we can safely warn and continue here. Even if we revert this behavior later, almost no one should be affected, since this essentially only impacts users developing `arc` itself.

Test Plan: Ran one copy of `arc` against another, saw a warning instead of an error. `arc unit` failed, but with a good error.

Reviewers: chad, jmeador

Reviewed By: jmeador

Differential Revision: https://secure.phabricator.com/D18264
This commit is contained in:
epriestley 2017-07-21 11:38:06 -07:00
parent 165df12046
commit 7bb8dbabce
1 changed files with 27 additions and 10 deletions
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37
scripts/arcanist.php
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@ -641,16 +641,33 @@ function arcanist_load_libraries(
if ($ex->getLibrary() != 'arcanist') { if ($ex->getLibrary() != 'arcanist') {
throw $ex; throw $ex;
} }
$arc_dir = dirname(dirname(__FILE__));
$error = pht( // NOTE: If you are running `arc` against itself, we ignore the library
"You are trying to run one copy of Arcanist on another copy of ". // conflict created by loading the local `arc` library (in the current
"Arcanist. This operation is not supported. To execute Arcanist ". // working directory) and continue without loading it.
"operations against this working copy, run `%s` (from the current ".
"working copy) not some other copy of '%s' (you ran one from '%s').", // This means we only execute code in the `arcanist/` directory which is
'./bin/arc', // associated with the binary you are running, whereas we would normally
'arc', // execute local code.
$arc_dir);
throw new ArcanistUsageException($error); // This can make `arc` development slightly confusing if your setup is
// especially bizarre, but it allows `arc` to be used in automation
// workflows more easily. For some context, see PHI13.
$executing_directory = dirname(dirname(__FILE__));
$working_directory = dirname($location);
fwrite(
STDERR,
tsprintf(
"**<bg:yellow> %s </bg>** %s\n",
pht('VERY META'),
pht(
'You are running one copy of Arcanist (at path "%s") against '.
'another copy of Arcanist (at path "%s"). Code in the current '.
'working directory will not be loaded or executed.',
$executing_directory,
$working_directory)));
} }
} }
} }