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Allow arc to be run in arcanist/ or libphutil/

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Summary:
Currently, if you run `arc` in arcanist/ or libphutil/ and your PATH and on-disk configuration are set up so a different version of arc or libphutil are the ones that actually load, we fail with an exception like "running arcanist in a different copy of arcanist is not supported".

This causes problems for Harbormaster, since we'd like to be able to run 'arc' in a copy of libphutil/ and have it execute unit tests for that copy rather than failing abruptly. So, if we detect that we're in arcanist/ or libphutil/, execute 'arc' again with the same arguments but force it to load the working copy in place of either the 'arcanist/' or the 'libphutil/' that it decided to load.

This is pretty much horrible black magic.

Test Plan: Ran 'arc list --trace' inside copies of libphutil/ and arcanist/ outside of the normal include chain. Saw it detect these, emit a message, and re-execute itself correctly.

Reviewers: btrahan, vrana

Reviewed By: vrana

CC: aran

Maniphest Tasks: T1049

Differential Revision: https://secure.phabricator.com/D4225
This commit is contained in:
epriestley 2012-12-17 16:35:03 -08:00
parent 6823706c76
commit b9fa71f7e1
2 changed files with 75 additions and 1 deletions
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6
scripts/__init_script__.php
View file

@ -40,7 +40,11 @@ function arcanist_adjust_php_include_path() {
}
arcanist_adjust_php_include_path();
@include_once 'libphutil/scripts/__init_script__.php';
if (getenv('ARC_PHUTIL_PATH')) {
@include_once getenv('ARC_PHUTIL_PATH').'/scripts/__init_script__.php';
} else {
@include_once 'libphutil/scripts/__init_script__.php';
}
if (!@constant('__LIBPHUTIL__')) {
echo "ERROR: Unable to load libphutil. Put libphutil/ next to arcanist/, or ".
"update your PHP 'include_path' to include the parent directory of ".

70
scripts/arcanist.php
View file

@ -73,6 +73,11 @@ try {
$system_config = ArcanistBaseWorkflow::readSystemArcConfig();
$working_copy = ArcanistWorkingCopyIdentity::newFromPath($working_directory);
reenter_if_this_is_arcanist_or_libphutil(
$console,
$working_copy,
$original_argv);
// Load additional libraries, which can provide new classes like configuration
// overrides, linters and lint engines, unit test engines, etc.
@ -535,3 +540,68 @@ function arcanist_load_libraries(
}
}
}
/**
* NOTE: SPOOKY BLACK MAGIC
*
* When arc is run in a copy of arcanist other than itself, or a copy of
* libphutil other than the one we loaded, reenter the script and force it
* to use the current working directory instead of the default.
*
* In the case of execution inside arcanist/, we force execution of the local
* arc binary.
*
* In the case of execution inside libphutil/, we force the local copy to load
* instead of the one selected by default rules.
*
* @param PhutilConsole Console.
* @param ArcanistWorkingCopyIdentity The current working copy.
* @param array Original arc arguments.
* @return void
*/
function reenter_if_this_is_arcanist_or_libphutil(
PhutilConsole $console,
ArcanistWorkingCopyIdentity $working_copy,
array $original_argv) {
$project_id = $working_copy->getProjectID();
if ($project_id != 'arcanist' && $project_id != 'libphutil') {
// We're not in a copy of arcanist or libphutil.
return;
}
$library_names = array(
'arcanist' => 'arcanist',
'libphutil' => 'phutil',
);
$library_root = phutil_get_library_root($library_names[$project_id]);
$project_root = $working_copy->getProjectRoot();
if (Filesystem::isDescendant($library_root, $project_root)) {
// We're in a copy of arcanist or libphutil, but already loaded the correct
// copy. Continue execution normally.
return;
}
if ($project_id == 'libphutil') {
$console->writeLog(
"This is libphutil! Forcing this copy to load...\n");
$original_argv[0] = dirname(phutil_get_library_root('arcanist')).'/bin/arc';
$libphutil_path = $project_root;
} else {
$console->writeLog(
"This is arcanist! Forcing this copy to run...\n");
$original_argv[0] = $project_root.'/bin/arc';
$libphutil_path = dirname(phutil_get_library_root('phutil'));
}
$err = phutil_passthru(
phutil_is_windows()
? 'set ARC_PHUTIL_PATH=%s & %Ls'
: 'ARC_PHUTIL_PATH=%s %Ls',
$libphutil_path,
$original_argv);
exit($err);
}