installer.php

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            // To allow relative package file names
            $descfile = realpath($descfile);

            if (PEAR::isError($tmpdir = System::mktemp('-d'))) {
                return $tmpdir;
            }
            $this->log(3, '+ tmp dir created at ' . $tmpdir);
            // }}}
        }
        // Parse xml file -----------------------------------------------
        $pkg = new PEAR_PackageFile($this->config, $this->debug, $tmpdir);
        PEAR::staticPushErrorHandling(PEAR_ERROR_RETURN);
        $p = &$pkg->fromAnyFile($descfile, PEAR_VALIDATE_INSTALLING);
        PEAR::staticPopErrorHandling();
        if (PEAR::isError($p)) {
            if (is_array($p->getUserInfo())) {
                foreach ($p->getUserInfo() as $err) {
                    $loglevel = $err['level'] == 'error' ? 0 : 1;
                    if (!isset($this->_options['soft'])) {
                        $this->log($loglevel, ucfirst($err['level']) . ': ' . $err['message']);
                    }
                }
            }
            return $this->raiseError('Installation failed: invalid package file');
        } else {
            $descfile = $p->getPackageFile();
        }
        return $p;
    }

    // }}}
    /**
     * Set the list of PEAR_Downloader_Package objects to allow more sane
     * dependency validation
     * @param array
     */
    function setDownloadedPackages(&$pkgs)
    {
        PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
        $err = $this->analyzeDependencies($pkgs);
        PEAR::popErrorHandling();
        if (PEAR::isError($err)) {
            return $err;
        }
        $this->_downloadedPackages = &$pkgs;
    }

    /**
     * Set the list of PEAR_Downloader_Package objects to allow more sane
     * dependency validation
     * @param array
     */
    function setUninstallPackages(&$pkgs)
    {
        $this->_downloadedPackages = &$pkgs;
    }

    function getInstallPackages()
    {
        return $this->_downloadedPackages;
    }

    // {{{ install()

    /**
     * Installs the files within the package file specified.
     *
     * @param string|PEAR_Downloader_Package $pkgfile path to the package file,
     *        or a pre-initialized packagefile object
     * @param array $options
     * recognized options:
     * - installroot   : optional prefix directory for installation
     * - force         : force installation
     * - register-only : update registry but don't install files
     * - upgrade       : upgrade existing install
     * - soft          : fail silently
     * - nodeps        : ignore dependency conflicts/missing dependencies
     * - alldeps       : install all dependencies
     * - onlyreqdeps   : install only required dependencies
     *
     * @return array|PEAR_Error package info if successful
     */

    function install($pkgfile, $options = array())
    {
        $this->_options = $options;
        $this->_registry = &$this->config->getRegistry();
        if (is_object($pkgfile)) {
            $dlpkg = &$pkgfile;
            $pkg = $pkgfile->getPackageFile();
            $pkgfile = $pkg->getArchiveFile();
            $descfile = $pkg->getPackageFile();
            $tmpdir = dirname($descfile);
        } else {
            $descfile = $pkgfile;
            $tmpdir = '';
            if (PEAR::isError($pkg = &$this->_parsePackageXml($descfile, $tmpdir))) {
                return $pkg;
            }
        }

        if (realpath($descfile) != realpath($pkgfile)) {
            $tar = new Archive_Tar($pkgfile);
            if (!$tar->extract($tmpdir)) {
                return $this->raiseError("unable to unpack $pkgfile");
            }
        }

        $pkgname = $pkg->getName();
        $channel = $pkg->getChannel();
        if (isset($this->_options['packagingroot'])) {
            $regdir = $this->_prependPath(
                $this->config->get('php_dir', null, 'pear.php.net'),
                $this->_options['packagingroot']);
            $packrootphp_dir = $this->_prependPath(
                $this->config->get('php_dir', null, $channel),
                $this->_options['packagingroot']);
        }

        if (isset($options['installroot'])) {
            $this->config->setInstallRoot($options['installroot']);
            $this->_registry = &$this->config->getRegistry();
            $installregistry = &$this->_registry;
            $this->installroot = ''; // all done automagically now
            $php_dir = $this->config->get('php_dir', null, $channel);
        } else {
            $this->config->setInstallRoot(false);
            $this->_registry = &$this->config->getRegistry();
            if (isset($this->_options['packagingroot'])) {
                $installregistry = &new PEAR_Registry($regdir);
                if (!$installregistry->channelExists($channel, true)) {
                    // we need to fake a channel-discover of this channel
                    $chanobj = $this->_registry->getChannel($channel, true);
                    $installregistry->addChannel($chanobj);
                }
                $php_dir = $packrootphp_dir;
            } else {
                $installregistry = &$this->_registry;
                $php_dir = $this->config->get('php_dir', null, $channel);
            }
            $this->installroot = '';
        }

        // {{{ checks to do when not in "force" mode
        if (empty($options['force']) &&
              (file_exists($this->config->get('php_dir')) &&
               is_dir($this->config->get('php_dir')))) {
            $testp = $channel == 'pear.php.net' ? $pkgname : array($channel, $pkgname);
            $instfilelist = $pkg->getInstallationFileList(true);
            if (PEAR::isError($instfilelist)) {
                return $instfilelist;
            }
            // ensure we have the most accurate registry
            $installregistry->flushFileMap();
            $test = $installregistry->checkFileMap($instfilelist, $testp, '1.1');
            if (PEAR::isError($test)) {
                return $test;
            }
            if (sizeof($test)) {
                $pkgs = $this->getInstallPackages();
                $found = false;
                foreach ($pkgs as $param) {
                    if ($pkg->isSubpackageOf($param)) {
                        $found = true;
                        break;
                    }
                }
                if ($found) {
                    // subpackages can conflict with earlier versions of parent packages
                    $parentreg = $installregistry->packageInfo($param->getPackage(), null, $param->getChannel());
                    $tmp = $test;
                    foreach ($tmp as $file => $info) {
                        if (is_array($info)) {
                            if (strtolower($info[1]) == strtolower($param->getPackage()) &&
                                  strtolower($info[0]) == strtolower($param->getChannel())) {
                                unset($test[$file]);
                                unset($parentreg['filelist'][$file]);
                            }
                        } else {
                            if (strtolower($param->getChannel()) != 'pear.php.net') {
                                continue;
                            }
                            if (strtolower($info) == strtolower($param->getPackage())) {
                                unset($test[$file]);
                                unset($parentreg['filelist'][$file]);
                            }
                        }
                    }
                    $pfk = &new PEAR_PackageFile($this->config);
                    $parentpkg = &$pfk->fromArray($parentreg);
                    $installregistry->updatePackage2($parentpkg);
                }
                if ($param->getChannel() == 'pecl.php.net' && isset($options['upgrade'])) {
                    $tmp = $test;
                    foreach ($tmp as $file => $info) {
                        if (is_string($info)) {
                            // pear.php.net packages are always stored as strings
                            if (strtolower($info) == strtolower($param->getPackage())) {
                                // upgrading existing package
                                unset($test[$file]);
                            }
                        }
                    }
                }
                if (sizeof($test)) {
                    $msg = "$channel/$pkgname: conflicting files found:\n";
                    $longest = max(array_map("strlen", array_keys($test)));
                    $fmt = "%${longest}s (%s)\n";
                    foreach ($test as $file => $info) {
                        if (!is_array($info)) {
                            $info = array('pear.php.net', $info);
                        }
                        $info = $info[0] . '/' . $info[1];
                        $msg .= sprintf($fmt, $file, $info);
                    }
                    if (!isset($options['ignore-errors'])) {
                        return $this->raiseError($msg);
                    } else {
                        if (!isset($options['soft'])) {
                            $this->log(0, "WARNING: $msg");
                        }
                    }
                }
            }
        }
        // }}}

        $this->startFileTransaction();

        if (empty($options['upgrade']) && empty($options['soft'])) {
            // checks to do only when installing new packages
            if ($channel == 'pecl.php.net') {
                $test = $installregistry->packageExists($pkgname, $channel);
                if (!$test) {
                    $test = $installregistry->packageExists($pkgname, 'pear.php.net');
                }
            } else {
                $test = $installregistry->packageExists($pkgname, $channel);
            }
            if (empty($options['force']) && $test) {
                return $this->raiseError("$channel/$pkgname is already installed");
            }
        } else {
            $usechannel = $channel;
            if ($channel == 'pecl.php.net') {
                $test = $installregistry->packageExists($pkgname, $channel);
                if (!$test) {
                    $test = $installregistry->packageExists($pkgname, 'pear.php.net');
                    $usechannel = 'pear.php.net';
                }
            } else {
                $test = $installregistry->packageExists($pkgname, $channel);
            }
            if ($test) {
                $v1 = $installregistry->packageInfo($pkgname, 'version', $usechannel);
                $v2 = $pkg->getVersion();
                $cmp = version_compare("$v1", "$v2", 'gt');
                if (empty($options['force']) && !version_compare("$v2", "$v1", 'gt')) {
                    return $this->raiseError("upgrade to a newer version ($v2 is not newer than $v1)");
                }
                if (empty($options['register-only'])) {
                    // when upgrading, remove old release's files first:
                    if (PEAR::isError($err = $this->_deletePackageFiles($pkgname, $usechannel,
                          true))) {
                        if (!isset($options['ignore-errors'])) {
                            return $this->raiseError($err);
                        } else {
                            if (!isset($options['soft'])) {
                                $this->log(0, 'WARNING: ' . $err->getMessage());
                            }
                        }
                    } else {
                        $backedup = $err;
                    }
                }
            }
        }

        // {{{ Copy files to dest dir ---------------------------------------

        // info from the package it self we want to access from _installFile
        $this->pkginfo = &$pkg;
        // used to determine whether we should build any C code
        $this->source_files = 0;

        $savechannel = $this->config->get('default_channel');
        if (empty($options['register-only']) && !is_dir($php_dir)) {
            if (PEAR::isError(System::mkdir(array('-p'), $php_dir))) {
                return $this->raiseError("no installation destination directory '$php_dir'\n");
            }
        }

        $tmp_path = dirname($descfile);
        if (substr($pkgfile, -4) != '.xml') {
            $tmp_path .= DIRECTORY_SEPARATOR . $pkgname . '-' . $pkg->getVersion();
        }

        $this->configSet('default_channel', $channel);
        // {{{ install files

        $ver = $pkg->getPackagexmlVersion();
        if (version_compare($ver, '2.0', '>=')) {
            $filelist = $pkg->getInstallationFilelist();
        } else {
            $filelist = $pkg->getFileList();
        }
        if (PEAR::isError($filelist)) {
            return $filelist;
        }
        $pkg->resetFilelist();
        $pkg->setLastInstalledVersion($installregistry->packageInfo($pkg->getPackage(),
            'version', $pkg->getChannel()));
        foreach ($filelist as $file => $atts) {
            if ($pkg->getPackagexmlVersion() == '1.0') {
                $this->expectError(PEAR_INSTALLER_FAILED);
                $res = $this->_installFile($file, $atts, $tmp_path, $options);
                $this->popExpect();
            } else {
                $this->expectError(PEAR_INSTALLER_FAILED);