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<?php
/*
* This file is part of Composer.
*
* (c) Nils Adermann <naderman@naderman.de>
* Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Composer\DependencyResolver;
use Composer\Package\AliasPackage;
use Composer\Package\Link;
use Composer\Package\PackageInterface;
use Composer\Repository\PlatformRepository;
use Composer\DependencyResolver\Operation\OperationInterface;
/**
* @author Nils Adermann <naderman@naderman.de>
* @internal
*/
class Transaction
{
/**
* @var OperationInterface[]
*/
protected $operations;
/**
* Packages present at the beginning of the transaction
* @var PackageInterface[]
*/
protected $presentPackages;
/**
* Package set resulting from this transaction
* @var array<string, PackageInterface>
*/
protected $resultPackageMap;
/**
* @var array<string, PackageInterface[]>
*/
protected $resultPackagesByName = array();
/**
* @param PackageInterface[] $presentPackages
* @param PackageInterface[] $resultPackages
*/
public function __construct($presentPackages, $resultPackages)
{
$this->presentPackages = $presentPackages;
$this->setResultPackageMaps($resultPackages);
$this->operations = $this->calculateOperations();
}
/**
* @return OperationInterface[]
*/
public function getOperations()
{
return $this->operations;
}
/**
* @param PackageInterface[] $resultPackages
* @return void
*/
private function setResultPackageMaps($resultPackages)
{
$packageSort = function (PackageInterface $a, PackageInterface $b) {
// sort alias packages by the same name behind their non alias version
if ($a->getName() == $b->getName()) {
if ($a instanceof AliasPackage != $b instanceof AliasPackage) {
return $a instanceof AliasPackage ? -1 : 1;
}
// if names are the same, compare version, e.g. to sort aliases reliably, actual order does not matter
return strcmp($b->getVersion(), $a->getVersion());
}
return strcmp($b->getName(), $a->getName());
};
$this->resultPackageMap = array();
foreach ($resultPackages as $package) {
$this->resultPackageMap[spl_object_hash($package)] = $package;
foreach ($package->getNames() as $name) {
$this->resultPackagesByName[$name][] = $package;
}
}
uasort($this->resultPackageMap, $packageSort);
foreach ($this->resultPackagesByName as $name => $packages) {
uasort($this->resultPackagesByName[$name], $packageSort);
}
}
/**
* @return OperationInterface[]
*/
protected function calculateOperations()
{
$operations = array();
$presentPackageMap = array();
$removeMap = array();
$presentAliasMap = array();
$removeAliasMap = array();
foreach ($this->presentPackages as $package) {
if ($package instanceof AliasPackage) {
$presentAliasMap[$package->getName().'::'.$package->getVersion()] = $package;
$removeAliasMap[$package->getName().'::'.$package->getVersion()] = $package;
} else {
$presentPackageMap[$package->getName()] = $package;
$removeMap[$package->getName()] = $package;
}
}
$stack = $this->getRootPackages();
$visited = array();
$processed = array();
while (!empty($stack)) {
$package = array_pop($stack);
if (isset($processed[spl_object_hash($package)])) {
continue;
}
if (!isset($visited[spl_object_hash($package)])) {
$visited[spl_object_hash($package)] = true;
$stack[] = $package;
if ($package instanceof AliasPackage) {
$stack[] = $package->getAliasOf();
} else {
foreach ($package->getRequires() as $link) {
$possibleRequires = $this->getProvidersInResult($link);
foreach ($possibleRequires as $require) {
$stack[] = $require;
}
}
}
} elseif (!isset($processed[spl_object_hash($package)])) {
$processed[spl_object_hash($package)] = true;
if ($package instanceof AliasPackage) {
$aliasKey = $package->getName().'::'.$package->getVersion();
if (isset($presentAliasMap[$aliasKey])) {
unset($removeAliasMap[$aliasKey]);
} else {
$operations[] = new Operation\MarkAliasInstalledOperation($package);
}
} else {
if (isset($presentPackageMap[$package->getName()])) {
$source = $presentPackageMap[$package->getName()];
// do we need to update?
// TODO different for lock?
if ($package->getVersion() != $presentPackageMap[$package->getName()]->getVersion() ||
$package->getDistReference() !== $presentPackageMap[$package->getName()]->getDistReference() ||
$package->getSourceReference() !== $presentPackageMap[$package->getName()]->getSourceReference()
) {
$operations[] = new Operation\UpdateOperation($source, $package);
}
unset($removeMap[$package->getName()]);
} else {
$operations[] = new Operation\InstallOperation($package);
unset($removeMap[$package->getName()]);
}
}
}
}
foreach ($removeMap as $name => $package) {
array_unshift($operations, new Operation\UninstallOperation($package));
}
foreach ($removeAliasMap as $nameVersion => $package) {
$operations[] = new Operation\MarkAliasUninstalledOperation($package);
}
$operations = $this->movePluginsToFront($operations);
// TODO fix this:
// we have to do this again here even though the above stack code did it because moving plugins moves them before uninstalls
$operations = $this->moveUninstallsToFront($operations);
// TODO skip updates which don't update? is this needed? we shouldn't schedule this update in the first place?
/*
if ('update' === $opType) {
$targetPackage = $operation->getTargetPackage();
if ($targetPackage->isDev()) {
$initialPackage = $operation->getInitialPackage();
if ($targetPackage->getVersion() === $initialPackage->getVersion()
&& (!$targetPackage->getSourceReference() || $targetPackage->getSourceReference() === $initialPackage->getSourceReference())
&& (!$targetPackage->getDistReference() || $targetPackage->getDistReference() === $initialPackage->getDistReference())
) {
$this->io->writeError(' - Skipping update of ' . $targetPackage->getPrettyName() . ' to the same reference-locked version', true, IOInterface::DEBUG);
$this->io->writeError('', true, IOInterface::DEBUG);
continue;
}
}
}*/
return $this->operations = $operations;
}
/**
* Determine which packages in the result are not required by any other packages in it.
*
* These serve as a starting point to enumerate packages in a topological order despite potential cycles.
* If there are packages with a cycle on the top level the package with the lowest name gets picked
*
* @return array<string, PackageInterface>
*/
protected function getRootPackages()
{
$roots = $this->resultPackageMap;
foreach ($this->resultPackageMap as $packageHash => $package) {
if (!isset($roots[$packageHash])) {
continue;
}
foreach ($package->getRequires() as $link) {
$possibleRequires = $this->getProvidersInResult($link);
foreach ($possibleRequires as $require) {
if ($require !== $package) {
unset($roots[spl_object_hash($require)]);
}
}
}
}
return $roots;
}
/**
* @return PackageInterface[]
*/
protected function getProvidersInResult(Link $link)
{
if (!isset($this->resultPackagesByName[$link->getTarget()])) {
return array();
}
return $this->resultPackagesByName[$link->getTarget()];
}
/**
* Workaround: if your packages depend on plugins, we must be sure
* that those are installed / updated first; else it would lead to packages
* being installed multiple times in different folders, when running Composer
* twice.
*
* While this does not fix the root-causes of https://github.com/composer/composer/issues/1147,
* it at least fixes the symptoms and makes usage of composer possible (again)
* in such scenarios.
*
* @param OperationInterface[] $operations
* @return OperationInterface[] reordered operation list
*/
private function movePluginsToFront(array $operations)
{
$dlModifyingPluginsNoDeps = array();
$dlModifyingPluginsWithDeps = array();
$dlModifyingPluginRequires = array();
$pluginsNoDeps = array();
$pluginsWithDeps = array();
$pluginRequires = array();
foreach (array_reverse($operations, true) as $idx => $op) {
if ($op instanceof Operation\InstallOperation) {
$package = $op->getPackage();
} elseif ($op instanceof Operation\UpdateOperation) {
$package = $op->getTargetPackage();
} else {
continue;
}
$isDownloadsModifyingPlugin = $package->getType() === 'composer-plugin' && ($extra = $package->getExtra()) && isset($extra['plugin-modifies-downloads']) && $extra['plugin-modifies-downloads'] === true;
// is this a downloads modifying plugin or a dependency of one?
if ($isDownloadsModifyingPlugin || count(array_intersect($package->getNames(), $dlModifyingPluginRequires))) {
// get the package's requires, but filter out any platform requirements
$requires = array_filter(array_keys($package->getRequires()), function ($req) {
return !PlatformRepository::isPlatformPackage($req);
});
// is this a plugin with no meaningful dependencies?
if ($isDownloadsModifyingPlugin && !count($requires)) {
// plugins with no dependencies go to the very front
array_unshift($dlModifyingPluginsNoDeps, $op);
} else {
// capture the requirements for this package so those packages will be moved up as well
$dlModifyingPluginRequires = array_merge($dlModifyingPluginRequires, $requires);
// move the operation to the front
array_unshift($dlModifyingPluginsWithDeps, $op);
}
unset($operations[$idx]);
continue;
}
// is this package a plugin?
$isPlugin = $package->getType() === 'composer-plugin' || $package->getType() === 'composer-installer';
// is this a plugin or a dependency of a plugin?
if ($isPlugin || count(array_intersect($package->getNames(), $pluginRequires))) {
// get the package's requires, but filter out any platform requirements
$requires = array_filter(array_keys($package->getRequires()), function ($req) {
return !PlatformRepository::isPlatformPackage($req);
});
// is this a plugin with no meaningful dependencies?
if ($isPlugin && !count($requires)) {
// plugins with no dependencies go to the very front
array_unshift($pluginsNoDeps, $op);
} else {
// capture the requirements for this package so those packages will be moved up as well
$pluginRequires = array_merge($pluginRequires, $requires);
// move the operation to the front
array_unshift($pluginsWithDeps, $op);
}
unset($operations[$idx]);
}
}
return array_merge($dlModifyingPluginsNoDeps, $dlModifyingPluginsWithDeps, $pluginsNoDeps, $pluginsWithDeps, $operations);
}
/**
* Removals of packages should be executed before installations in
* case two packages resolve to the same path (due to custom installers)
*
* @param OperationInterface[] $operations
* @return OperationInterface[] reordered operation list
*/
private function moveUninstallsToFront(array $operations)
{
$uninstOps = array();
foreach ($operations as $idx => $op) {
if ($op instanceof Operation\UninstallOperation || $op instanceof Operation\MarkAliasUninstalledOperation) {
$uninstOps[] = $op;
unset($operations[$idx]);
}
}
return array_merge($uninstOps, $operations);
}
}