// NOTE: We're using `set -o pipefail` so this command fails if any
// part (in particular, the `bin/storage dump`) fails. This is specific
// to bash and the default shell is dash under Ubuntu, so we need to
// invoke bash explicitly.

$command = csprintf(
  'set -o pipefail && PHACILITY_INSTANCE=%s %s dump | gzip > %s',
  $instance,
  $this->getPath('lib/phabricator/bin/storage'),
  $database_path);

$t_start = microtime(true);
try {
  execx('/bin/bash -c %s', $command);
} catch (CommandException $ex) {
  try {
    // Try to remove the possibly-empty but certainly-invalid file, if
    // it exists.
    Filesystem::remove($database_path);
  } catch (Exception $ex) {
    // If anything went wrong, ignore the cleanup failure; we just want
    // to raise the root cause.
  }
  throw $ex;
}
$t_end = microtime(true);

bin/storage dump --gzip --outfile <filename>