Request jobs replaced by root require / fixed package

The only type of request job remaining was "install" which is really a
root requirement. The only other kind of input for the solver is now a
set of fixed packages.

Rules have been updated to account for only two kinds of former job
reason: FIXED or ROOT_REQUIRE. The job property has always been
redundant and has been removed, since reasonData suffices.

Problem reasons are always rules, so the unnecessary wrapping in an
array has been removed.

We now only ever generate a single rule per root require or fixed
package, so there is no need for the solver to special handle disabling
"jobs" anymore, the rule can just be disabled as usual.

For consistency special handling of rules for jobs in problems has been
integrated into the rule class like all other rule reasons. As part of
this change the error message for root requirements has been improved a
bit to make it clearer where the package installation request came from.

The word job has also been removed from operations, which are called
operations, not jobs.

src/Composer/DependencyResolver/GenericRule.php

@@ -26,11 +26,10 @@ class GenericRule extends Rule
      * @param array                          $literals
      * @param int|null                       $reason     A RULE_* constant describing the reason for generating this rule
      * @param Link|PackageInterface|int|null $reasonData
-     * @param array                          $job        The job this rule was created from
      */
-    public function __construct(array $literals, $reason, $reasonData, $job = null)
+    public function __construct(array $literals, $reason, $reasonData)
     {
-        parent::__construct($reason, $reasonData, $job);
+        parent::__construct($reason, $reasonData);
 
         // sort all packages ascending by id
         sort($literals);

src/Composer/DependencyResolver/MultiConflictRule.php

@@ -28,11 +28,10 @@ class MultiConflictRule extends Rule
      * @param array                 $literals
      * @param int                   $reason     A RULE_* constant describing the reason for generating this rule
      * @param Link|PackageInterface $reasonData
-     * @param array                 $job        The job this rule was created from
      */
-    public function __construct(array $literals, $reason, $reasonData, $job = null)
+    public function __construct(array $literals, $reason, $reasonData)
     {
-        parent::__construct($reason, $reasonData, $job);
+        parent::__construct($reason, $reasonData);
 
         if (count($literals) < 3) {
             throw new \RuntimeException("multi conflict rule requires at least 3 literals");

src/Composer/DependencyResolver/Operation/InstallOperation.php

@@ -47,11 +47,11 @@ class InstallOperation extends SolverOperation
     }
 
     /**
-     * Returns job type.
+     * Returns operation type.
      *
      * @return string
      */
-    public function getJobType()
+    public function getOperationType()
     {
         return 'install';
     }

src/Composer/DependencyResolver/Operation/MarkAliasInstalledOperation.php

@@ -48,11 +48,11 @@ class MarkAliasInstalledOperation extends SolverOperation
     }
 
     /**
-     * Returns job type.
+     * Returns operation type.
      *
      * @return string
      */
-    public function getJobType()
+    public function getOperationType()
     {
         return 'markAliasInstalled';
     }

src/Composer/DependencyResolver/Operation/MarkAliasUninstalledOperation.php

@@ -48,11 +48,11 @@ class MarkAliasUninstalledOperation extends SolverOperation
     }
 
     /**
-     * Returns job type.
+     * Returns operation type.
      *
      * @return string
      */
-    public function getJobType()
+    public function getOperationType()
     {
         return 'markAliasUninstalled';
     }

src/Composer/DependencyResolver/Operation/OperationInterface.php

@@ -20,11 +20,11 @@ namespace Composer\DependencyResolver\Operation;
 interface OperationInterface
 {
     /**
-     * Returns job type.
+     * Returns operation type.
      *
      * @return string
      */
-    public function getJobType();
+    public function getOperationType();
 
     /**
      * Returns operation reason.

src/Composer/DependencyResolver/Operation/UninstallOperation.php

@@ -47,11 +47,11 @@ class UninstallOperation extends SolverOperation
     }
 
     /**
-     * Returns job type.
+     * Returns operation type.
      *
      * @return string
      */
-    public function getJobType()
+    public function getOperationType()
     {
         return 'uninstall';
     }

src/Composer/DependencyResolver/Operation/UpdateOperation.php

@@ -60,11 +60,11 @@ class UpdateOperation extends SolverOperation
     }
 
     /**
-     * Returns job type.
+     * Returns operation type.
      *
      * @return string
      */
-    public function getJobType()
+    public function getOperationType()
     {
         return 'update';
     }

src/Composer/DependencyResolver/PoolBuilder.php

@@ -69,20 +69,16 @@ class PoolBuilder
             }
         }
 
-        foreach ($request->getJobs() as $job) {
-            switch ($job['cmd']) {
-                case 'install':
-                    if (isset($this->loadedNames[$job['packageName']])) {
-                        continue 2;
-                    }
-                    // TODO currently lock above is always NULL if we adjust that, this needs to merge constraints
-                    // TODO does it really make sense that we can have install requests for the same package that is actively locked with non-matching constraints?
-                    // also see the solver-problems.test test case
-                    $constraint = array_key_exists($job['packageName'], $loadNames) ? null : $job['constraint'];
-                    $loadNames[$job['packageName']] = $constraint;
-                    $this->nameConstraints[$job['packageName']] = $constraint ? new MultiConstraint(array($constraint), false) : null;
-                    break;
+        foreach ($request->getRequires() as $packageName => $constraint) {
+            if (isset($this->loadedNames[$packageName])) {
+                continue;
             }
+            // TODO currently lock above is always NULL if we adjust that, this needs to merge constraints
+            // TODO does it really make sense that we can have install requests for the same package that is actively locked with non-matching constraints?
+            // also see the solver-problems.test test case
+            $constraint = array_key_exists($packageName, $loadNames) ? null : $constraint;
+            $loadNames[$packageName] = $constraint;
+            $this->nameConstraints[$packageName] = $constraint ? new MultiConstraint(array($constraint), false) : null;
         }
 
         while (!empty($loadNames)) {

src/Composer/DependencyResolver/Problem.php

@@ -28,7 +28,7 @@ class Problem
     protected $reasonSeen;
 
     /**
-     * A set of reasons for the problem, each is a rule or a job and a rule
+     * A set of reasons for the problem, each is a rule or a root require and a rule
      * @var array
      */
     protected $reasons = array();
@@ -49,10 +49,7 @@ class Problem
      */
     public function addRule(Rule $rule)
     {
-        $this->addReason(spl_object_hash($rule), array(
-            'rule' => $rule,
-            'job' => $rule->getJob(),
-        ));
+        $this->addReason(spl_object_hash($rule), $rule);
     }
 
     /**
@@ -73,16 +70,21 @@ class Problem
      */
     public function getPrettyString(array $installedMap = array(), array $learnedPool = array())
     {
+        // TODO doesn't this entirely defeat the purpose of the problem sections? what's the point of sections?
         $reasons = call_user_func_array('array_merge', array_reverse($this->reasons));
 
         if (count($reasons) === 1) {
             reset($reasons);
-            $reason = current($reasons);
+            $rule = current($reasons);
 
-            $job = $reason['job'];
+            if (!in_array($rule->getReason(), array(Rule::RULE_ROOT_REQUIRE, Rule::RULE_FIXED), true)) {
+                throw new \LogicException("Single reason problems must contain a request rule.");
+            }
+
+            $request = $rule->getReasonData();
 
-            $packageName = $job['packageName'];
-            $constraint = $job['constraint'];
+            $packageName = $request['packageName'];
+            $constraint = $request['constraint'];
 
             if (isset($constraint)) {
                 $packages = $this->pool->whatProvides($packageName, $constraint);
@@ -90,8 +92,7 @@ class Problem
                 $packages = array();
             }
 
-            if ($job && ($job['cmd'] === 'install' || $job['cmd'] === 'fix') && empty($packages)) {
-
+            if ($request && empty($packages)) {
                 // handle php/hhvm
                 if ($packageName === 'php' || $packageName === 'php-64bit' || $packageName === 'hhvm') {
                     $version = phpversion();
@@ -164,17 +165,8 @@ class Problem
 
         $messages = array();
 
-        foreach ($reasons as $reason) {
-            $rule = $reason['rule'];
-            $job = $reason['job'];
-
-            if ($job) {
-                $messages[] = $this->jobToText($job);
-            } elseif ($rule) {
-                if ($rule instanceof Rule) {
-                    $messages[] = $rule->getPrettyString($this->pool, $installedMap, $learnedPool);
-                }
-            }
+        foreach ($reasons as $rule) {
+            $messages[] = $rule->getPrettyString($this->pool, $installedMap, $learnedPool);
         }
 
         return "\n    - ".implode("\n    - ", $messages);
@@ -184,10 +176,13 @@ class Problem
      * Store a reason descriptor but ignore duplicates
      *
      * @param string $id     A canonical identifier for the reason
-     * @param string|array $reason The reason descriptor
+     * @param Rule $reason The reason descriptor
      */
-    protected function addReason($id, $reason)
+    protected function addReason($id, Rule $reason)
     {
+        // TODO: if a rule is part of a problem description in two sections, isn't this going to remove a message
+        // that is important to understand the issue?
+
         if (!isset($this->reasonSeen[$id])) {
             $this->reasonSeen[$id] = true;
             $this->reasons[$this->section][] = $reason;
@@ -199,42 +194,6 @@ class Problem
         $this->section++;
     }
 
-    /**
-     * Turns a job into a human readable description
-     *
-     * @param  array  $job
-     * @return string
-     */
-    protected function jobToText($job)
-    {
-        $packageName = $job['packageName'];
-        $constraint = $job['constraint'];
-        switch ($job['cmd']) {
-            case 'fix':
-                $package = $job['package'];
-                if ($job['lockable']) {
-                    return $package->getPrettyName().' is locked to version '.$package->getPrettyVersion().' and an update of this package was not requested.';
-                }
-
-                return $package->getPrettyName().' is present at version '.$package->getPrettyVersion() . ' and cannot be modified by Composer';
-            case 'install':
-                $packages = $this->pool->whatProvides($packageName, $constraint);
-                if (!$packages) {
-                    return 'No package found to satisfy install request for '.$packageName.$this->constraintToText($constraint);
-                }
-
-                return 'Installation request for '.$packageName.$this->constraintToText($constraint).' -> satisfiable by '.$this->getPackageList($packages).'.';
-        }
-
-        if (isset($constraint)) {
-            $packages = $this->pool->whatProvides($packageName, $constraint);
-        } else {
-            $packages = $this->pool->whatProvides($job['packageName'], null);
-        }
-
-        return 'Job(cmd='.$job['cmd'].', target='.$packageName.', packages=['.$this->getPackageList($packages).'])';
-    }
-
     protected function getPackageList($packages)
     {
         $prepared = array();
@@ -250,7 +209,7 @@ class Problem
     }
 
     /**
-     * Turns a constraint into text usable in a sentence describing a job
+     * Turns a constraint into text usable in a sentence describing a request
      *
      * @param  \Composer\Semver\Constraint\ConstraintInterface $constraint
      * @return string

src/Composer/DependencyResolver/Request.php

@@ -24,7 +24,7 @@ use Composer\Semver\Constraint\ConstraintInterface;
 class Request
 {
     protected $lockedRepository;
-    protected $jobs = array();
+    protected $requires = array();
     protected $fixedPackages = array();
     protected $unlockables = array();
 
@@ -33,9 +33,10 @@ class Request
         $this->lockedRepository = $lockedRepository;
     }
 
-    public function install($packageName, ConstraintInterface $constraint = null)
+    public function require($packageName, ConstraintInterface $constraint = null)
     {
-        $this->addJob($packageName, 'install', $constraint);
+        $packageName = strtolower($packageName);
+        $this->requires[$packageName] = $constraint;
     }
 
     /**
@@ -52,20 +53,9 @@ class Request
         }
     }
 
-    protected function addJob($packageName, $cmd, ConstraintInterface $constraint = null)
-    {
-        $packageName = strtolower($packageName);
-
-        $this->jobs[] = array(
-            'cmd' => $cmd,
-            'packageName' => $packageName,
-            'constraint' => $constraint,
-        );
-    }
-
-    public function getJobs()
+    public function getRequires()
     {
-        return $this->jobs;
+        return $this->requires;
     }
 
     public function getFixedPackages()

src/Composer/DependencyResolver/Rule.php

@@ -24,8 +24,8 @@ abstract class Rule
 {
     // reason constants
     const RULE_INTERNAL_ALLOW_UPDATE = 1;
-    const RULE_JOB_INSTALL = 2;
-    const RULE_JOB_REMOVE = 3;
+    const RULE_ROOT_REQUIRE = 2;
+    const RULE_FIXED = 3;
     const RULE_PACKAGE_CONFLICT = 6;
     const RULE_PACKAGE_REQUIRES = 7;
     const RULE_PACKAGE_OBSOLETES = 8;
@@ -41,22 +41,17 @@ abstract class Rule
     const BITFIELD_DISABLED = 16;
 
     protected $bitfield;
-    protected $job;
+    protected $request;
     protected $reasonData;
 
     /**
      * @param int                   $reason     A RULE_* constant describing the reason for generating this rule
      * @param Link|PackageInterface $reasonData
-     * @param array                 $job        The job this rule was created from
      */
-    public function __construct($reason, $reasonData, $job = null)
+    public function __construct($reason, $reasonData)
     {
         $this->reasonData = $reasonData;
 
-        if ($job) {
-            $this->job = $job;
-        }
-
         $this->bitfield = (0 << self::BITFIELD_DISABLED) |
             ($reason << self::BITFIELD_REASON) |
             (255 << self::BITFIELD_TYPE);
@@ -66,11 +61,6 @@ abstract class Rule
 
     abstract public function getHash();
 
-    public function getJob()
-    {
-        return $this->job;
-    }
-
     abstract public function equals(Rule $rule);
 
     public function getReason()
@@ -85,11 +75,17 @@ abstract class Rule
 
     public function getRequiredPackage()
     {
-        if ($this->getReason() === self::RULE_JOB_INSTALL) {
-            return $this->reasonData;
+        $reason = $this->getReason();
+
+        if ($reason === self::RULE_ROOT_REQUIRE) {
+            return $this->reasonData['packageName'];
+        }
+
+        if ($reason === self::RULE_FIXED) {
+            return $this->reasonData['package']->getName();
         }
 
-        if ($this->getReason() === self::RULE_PACKAGE_REQUIRES) {
+        if ($reason === self::RULE_PACKAGE_REQUIRES) {
             return $this->reasonData->getTarget();
         }
     }
@@ -142,11 +138,24 @@ abstract class Rule
             case self::RULE_INTERNAL_ALLOW_UPDATE:
                 return $ruleText;
 
-            case self::RULE_JOB_INSTALL:
-                return "Install command rule ($ruleText)";
+            case self::RULE_ROOT_REQUIRE:
+                $packageName = $this->reasonData['packageName'];
+                $constraint = $this->reasonData['constraint'];
+
+                $packages = $pool->whatProvides($packageName, $constraint);
+                if (!$packages) {
+                    return 'No package found to satisfy root composer.json require '.$packageName.($constraint ? ' '.$constraint->getPrettyString() : '');
+                }
 
-            case self::RULE_JOB_REMOVE:
-                return "Remove command rule ($ruleText)";
+                return 'Root composer.json requires '.$packageName.($constraint ? ' '.$constraint->getPrettyString() : '').' -> satisfiable by '.$this->formatPackagesUnique($pool, $packages).'.';
+
+            case self::RULE_FIXED:
+                $package = $this->reasonData['package'];
+                if ($this->reasonData['lockable']) {
+                    return $package->getPrettyName().' is locked to version '.$package->getPrettyVersion().' and an update of this package was not requested.';
+                }
+
+                return $package->getPrettyName().' is present at version '.$package->getPrettyVersion() . ' and cannot be modified by Composer';
 
             case self::RULE_PACKAGE_CONFLICT:
                 $package1 = $pool->literalToPackage($literals[0]);
@@ -263,6 +272,8 @@ abstract class Rule
      */
     protected function formatPackagesUnique($pool, array $packages)
     {
+        // TODO this is essentially a duplicate of Problem: getPackageList, maintain in one place only?
+
         $prepared = array();
         foreach ($packages as $package) {
             if (!is_object($package)) {

src/Composer/DependencyResolver/Rule2Literals.php

@@ -28,11 +28,10 @@ class Rule2Literals extends Rule
      * @param int                   $literal2
      * @param int                   $reason     A RULE_* constant describing the reason for generating this rule
      * @param Link|PackageInterface $reasonData
-     * @param array                 $job        The job this rule was created from
      */
-    public function __construct($literal1, $literal2, $reason, $reasonData, $job = null)
+    public function __construct($literal1, $literal2, $reason, $reasonData)
     {
-        parent::__construct($reason, $reasonData, $job);
+        parent::__construct($reason, $reasonData);
 
         if ($literal1 < $literal2) {
             $this->literal1 = $literal1;

src/Composer/DependencyResolver/RuleSet.php

@@ -19,7 +19,7 @@ class RuleSet implements \IteratorAggregate, \Countable
 {
     // highest priority => lowest number
     const TYPE_PACKAGE = 0;
-    const TYPE_JOB = 1;
+    const TYPE_REQUEST = 1;
     const TYPE_LEARNED = 4;
 
     /**
@@ -32,7 +32,7 @@ class RuleSet implements \IteratorAggregate, \Countable
     protected static $types = array(
         255 => 'UNKNOWN',
         self::TYPE_PACKAGE => 'PACKAGE',
-        self::TYPE_JOB => 'JOB',
+        self::TYPE_REQUEST => 'REQUEST',
         self::TYPE_LEARNED => 'LEARNED',
     );
 

src/Composer/DependencyResolver/RuleSetGenerator.php

@@ -76,33 +76,17 @@ class RuleSetGenerator
      * @param  array $packages The set of packages to choose from
      * @param  int   $reason   A RULE_* constant describing the reason for
      *                         generating this rule
-     * @param  array $job      The job this rule was created from
+     * @param  array $reasonData Additional data like the root require or fix request info
      * @return Rule  The generated rule
      */
-    protected function createInstallOneOfRule(array $packages, $reason, $job)
+    protected function createInstallOneOfRule(array $packages, $reason, $reasonData)
     {
         $literals = array();
         foreach ($packages as $package) {
             $literals[] = $package->id;
         }
 
-        return new GenericRule($literals, $reason, $job['packageName'], $job);
-    }
-
-    /**
-     * Creates a rule to remove a package
-     *
-     * The rule for a package A is (-A).
-     *
-     * @param  PackageInterface $package The package to be removed
-     * @param  int              $reason  A RULE_* constant describing the
-     *                                   reason for generating this rule
-     * @param  array            $job     The job this rule was created from
-     * @return Rule             The generated rule
-     */
-    protected function createRemoveRule(PackageInterface $package, $reason, $job)
-    {
-        return new GenericRule(array(-$package->id), $reason, $job['packageName'], $job);
+        return new GenericRule($literals, $reason, $reasonData);
     }
 
     /**
@@ -302,34 +286,29 @@ class RuleSetGenerator
 
             $this->addRulesForPackage($package, $ignorePlatformReqs);
 
-            $rule = $this->createInstallOneOfRule(array($package), Rule::RULE_JOB_INSTALL, array(
-                'cmd' => 'fix',
-                'packageName' => $package->getName(),
-                'constraint' => null,
+            $rule = $this->createInstallOneOfRule(array($package), Rule::RULE_FIXED, array(
                 'package' => $package,
                 'lockable' => !isset($unlockableMap[$package->id]),
-                'fixed' => true
             ));
-            $this->addRule(RuleSet::TYPE_JOB, $rule);
+            $this->addRule(RuleSet::TYPE_REQUEST, $rule);
         }
 
-        foreach ($request->getJobs() as $job) {
-            switch ($job['cmd']) {
-                case 'install':
-                    if ($ignorePlatformReqs && preg_match(PlatformRepository::PLATFORM_PACKAGE_REGEX, $job['packageName'])) {
-                        break;
-                    }
+        foreach ($request->getRequires() as $packageName => $constraint) {
+            if ($ignorePlatformReqs && preg_match(PlatformRepository::PLATFORM_PACKAGE_REGEX, $packageName)) {
+                continue;
+            }
 
-                    $packages = $this->pool->whatProvides($job['packageName'], $job['constraint']);
-                    if ($packages) {
-                        foreach ($packages as $package) {
-                            $this->addRulesForPackage($package, $ignorePlatformReqs);
-                        }
+            $packages = $this->pool->whatProvides($packageName, $constraint);
+            if ($packages) {
+                foreach ($packages as $package) {
+                    $this->addRulesForPackage($package, $ignorePlatformReqs);
+                }
 
-                        $rule = $this->createInstallOneOfRule($packages, Rule::RULE_JOB_INSTALL, $job);
-                        $this->addRule(RuleSet::TYPE_JOB, $rule);
-                    }
-                    break;
+                $rule = $this->createInstallOneOfRule($packages, Rule::RULE_ROOT_REQUIRE, array(
+                    'packageName' => $packageName,
+                    'constraint' => $constraint,
+                ));
+                $this->addRule(RuleSet::TYPE_REQUEST, $rule);
             }
         }
     }

src/Composer/DependencyResolver/Solver.php

@@ -124,19 +124,19 @@ class Solver
 
                 $problem->addRule($rule);
                 $problem->addRule($conflict);
-                $this->disableProblem($rule);
+                $rule->disable();
                 $this->problems[] = $problem;
                 continue;
             }
 
-            // conflict with another job
+            // conflict with another root require/fixed package
             $problem = new Problem($this->pool);
             $problem->addRule($rule);
             $problem->addRule($conflict);
 
-            // push all of our rules (can only be job rules)
+            // push all of our rules (can only be root require/fixed package rules)
             // asserting this literal on the problem stack
-            foreach ($this->rules->getIteratorFor(RuleSet::TYPE_JOB) as $assertRule) {
+            foreach ($this->rules->getIteratorFor(RuleSet::TYPE_REQUEST) as $assertRule) {
                 if ($assertRule->isDisabled() || !$assertRule->isAssertion()) {
                     continue;
                 }
@@ -148,7 +148,7 @@ class Solver
                     continue;
                 }
                 $problem->addRule($assertRule);
-                $this->disableProblem($assertRule);
+                $assertRule->disable();
             }
             $this->problems[] = $problem;
 
@@ -171,19 +171,15 @@ class Solver
      */
     protected function checkForRootRequireProblems($request, $ignorePlatformReqs)
     {
-        foreach ($request->getJobs() as $job) {
-            switch ($job['cmd']) {
-                case 'install':
-                    if ($ignorePlatformReqs && preg_match(PlatformRepository::PLATFORM_PACKAGE_REGEX, $job['packageName'])) {
-                        break;
-                    }
+        foreach ($request->getRequires() as $packageName => $constraint) {
+            if ($ignorePlatformReqs && preg_match(PlatformRepository::PLATFORM_PACKAGE_REGEX, $packageName)) {
+                continue;
+            }
 
-                    if (!$this->pool->whatProvides($job['packageName'], $job['constraint'])) {
-                        $problem = new Problem($this->pool);
-                        $problem->addRule(new GenericRule(array(), null, null, $job));
-                        $this->problems[] = $problem;
-                    }
-                    break;
+            if (!$this->pool->whatProvides($packageName, $constraint)) {
+                $problem = new Problem($this->pool);
+                $problem->addRule(new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, array('packageName' => $packageName, 'constraint' => $constraint)));
+                $this->problems[] = $problem;
             }
         }
     }
@@ -208,7 +204,7 @@ class Solver
             $this->watchGraph->insert(new RuleWatchNode($rule));
         }
 
-        /* make decisions based on job/update assertions */
+        /* make decisions based on root require/fix assertions */
         $this->makeAssertionRuleDecisions();
 
         $this->io->writeError('Resolving dependencies through SAT', true, IOInterface::DEBUG);
@@ -562,28 +558,6 @@ class Solver
         return 0;
     }
 
-    /**
-     * @param Rule $why
-     */
-    private function disableProblem(Rule $why)
-    {
-        $job = $why->getJob();
-
-        if (!$job) {
-            $why->disable();
-
-            return;
-        }
-
-        // disable all rules of this job
-        foreach ($this->rules as $rule) {
-            /** @var Rule $rule */
-            if ($job === $rule->getJob()) {
-                $rule->disable();
-            }
-        }
-    }
-
     private function resetSolver()
     {
         $this->decisions->reset();
@@ -631,7 +605,7 @@ class Solver
         /*
          * here's the main loop:
          * 1) propagate new decisions (only needed once)
-         * 2) fulfill jobs
+         * 2) fulfill root requires/fixed packages
          * 3) fulfill all unresolved rules
          * 4) minimalize solution if we had choices
          * if we encounter a problem, we rewind to a safe level and restart
@@ -657,9 +631,9 @@ class Solver
                 }
             }
 
-            // handle job rules
+            // handle root require/fixed package rules
             if ($level < $systemLevel) {
-                $iterator = $this->rules->getIteratorFor(RuleSet::TYPE_JOB);
+                $iterator = $this->rules->getIteratorFor(RuleSet::TYPE_REQUEST);
                 foreach ($iterator as $rule) {
                     if ($rule->isEnabled()) {
                         $decisionQueue = array();
@@ -704,7 +678,7 @@ class Solver
 
                 $systemLevel = $level + 1;
 
-                // jobs left
+                // root requires/fixed packages left
                 $iterator->next();
                 if ($iterator->valid()) {
                     continue;

src/Composer/DependencyResolver/SolverProblemsException.php

@@ -78,8 +78,8 @@ class SolverProblemsException extends \RuntimeException
     private function hasExtensionProblems(array $reasonSets)
     {
         foreach ($reasonSets as $reasonSet) {
-            foreach ($reasonSet as $reason) {
-                if (isset($reason["rule"]) && 0 === strpos($reason["rule"]->getRequiredPackage(), 'ext-')) {
+            foreach ($reasonSet as $rule) {
+                if (0 === strpos($rule->getRequiredPackage(), 'ext-')) {
                     return true;
                 }
             }

src/Composer/DependencyResolver/Transaction.php

@@ -170,7 +170,7 @@ class Transaction
 
         // TODO skip updates which don't update? is this needed? we shouldn't schedule this update in the first place?
         /*
-        if ('update' === $jobType) {
+        if ('update' === $opType) {
             $targetPackage = $operation->getTargetPackage();
             if ($targetPackage->isDev()) {
                 $initialPackage = $operation->getInitialPackage();

src/Composer/Installer.php

@@ -371,11 +371,11 @@ class Installer
         // if we're updating mirrors we want to keep exactly the same versions installed which are in the lock file, but we want current remote metadata
         if ($this->updateMirrors) {
             foreach ($lockedRepository->getPackages() as $lockedPackage) {
-                $request->install($lockedPackage->getName(), new Constraint('==', $lockedPackage->getVersion()));
+                $request->require($lockedPackage->getName(), new Constraint('==', $lockedPackage->getVersion()));
             }
         } else {
             foreach ($links as $link) {
-                $request->install($link->getTarget(), $link->getConstraint());
+                $request->require($link->getTarget(), $link->getConstraint());
             }
         }
 
@@ -464,13 +464,12 @@ class Installer
 
         foreach ($lockTransaction->getOperations() as $operation) {
             // collect suggestions
-            $jobType = $operation->getJobType();
             if ($operation instanceof InstallOperation) {
                 $this->suggestedPackagesReporter->addSuggestionsFromPackage($operation->getPackage());
             }
 
             // output op, but alias op only in debug verbosity
-            if (false === strpos($operation->getJobType(), 'Alias') || $this->io->isDebug()) {
+            if (false === strpos($operation->getOperationType(), 'Alias') || $this->io->isDebug()) {
                 $this->io->writeError('  - ' . $operation->show(true));
             }
         }
@@ -524,7 +523,7 @@ class Installer
 
         $links = $this->package->getRequires();
         foreach ($links as $link) {
-            $request->install($link->getTarget(), $link->getConstraint());
+            $request->require($link->getTarget(), $link->getConstraint());
         }
 
         $pool = $repositorySet->createPool($request);
@@ -582,7 +581,7 @@ class Installer
             }
 
             foreach ($this->locker->getPlatformRequirements($this->devMode) as $link) {
-                $request->install($link->getTarget(), $link->getConstraint());
+                $request->require($link->getTarget(), $link->getConstraint());
             }
 
             //$this->eventDispatcher->dispatchInstallerEvent(InstallerEvents::PRE_DEPENDENCIES_SOLVING, $this->devMode, $policy, $repositorySet, $installedRepo, $request);
@@ -656,7 +655,7 @@ class Installer
         } else {
             foreach ($localRepoTransaction->getOperations() as $operation) {
                 // output op, but alias op only in debug verbosity
-                if (false === strpos($operation->getJobType(), 'Alias') || $this->io->isDebug()) {
+                if (false === strpos($operation->getOperationType(), 'Alias') || $this->io->isDebug()) {
                     $this->io->writeError('  - ' . $operation->show(false));
                 }
             }

src/Composer/Installer/InstallationManager.php

@@ -173,14 +173,14 @@ class InstallationManager
         $promises = array();
 
         foreach ($operations as $operation) {
-            $jobType = $operation->getJobType();
+            $opType = $operation->getOperationType();
             $promise = null;
 
-            if ($jobType === 'install') {
+            if ($opType === 'install') {
                 $package = $operation->getPackage();
                 $installer = $this->getInstaller($package->getType());
                 $promise = $installer->download($package);
-            } elseif ($jobType === 'update') {
+            } elseif ($opType === 'update') {
                 $target = $operation->getTargetPackage();
                 $targetType = $target->getType();
                 $installer = $this->getInstaller($targetType);
@@ -197,29 +197,29 @@ class InstallationManager
         }
 
         foreach ($operations as $operation) {
-            $jobType = $operation->getJobType();
+            $opType = $operation->getOperationType();
 
             // ignoring alias ops as they don't need to execute anything
-            if (!in_array($jobType, array('update', 'install', 'uninstall'))) {
+            if (!in_array($opType, array('update', 'install', 'uninstall'))) {
                 // output alias ops in debug verbosity as they have no output otherwise
                 if ($this->io->isDebug()) {
                     $this->io->writeError('  - ' . $operation->show(false));
                 }
-                $this->$jobType($repo, $operation);
+                $this->$opType($repo, $operation);
 
                 continue;
             }
 
-            if ($jobType === 'install' || $jobType === 'uninstall') {
+            if ($opType === 'install' || $opType === 'uninstall') {
                 $package = $operation->getPackage();
                 $initialPackage = null;
-            } elseif ($jobType === 'update') {
+            } elseif ($opType === 'update') {
                 $package = $operation->getTargetPackage();
                 $initialPackage = $operation->getInitialPackage();
             }
             $installer = $this->getInstaller($package->getType());
 
-            $event = 'Composer\Installer\PackageEvents::PRE_PACKAGE_'.strtoupper($jobType);
+            $event = 'Composer\Installer\PackageEvents::PRE_PACKAGE_'.strtoupper($opType);
             if (defined($event) && $runScripts && $this->eventDispatcher) {
                 $this->eventDispatcher->dispatchPackageEvent(constant($event), $devMode, $repo, $operations, $operation);
             }
@@ -229,26 +229,26 @@ class InstallationManager
             $loop = $this->loop;
             $io = $this->io;
 
-            $promise = $installer->prepare($jobType, $package, $initialPackage);
+            $promise = $installer->prepare($opType, $package, $initialPackage);
             if (null === $promise) {
                 $promise = new \React\Promise\Promise(function ($resolve, $reject) { $resolve(); });
             }
 
-            $promise = $promise->then(function () use ($jobType, $installManager, $repo, $operation) {
-                return $installManager->$jobType($repo, $operation);
-            })->then(function () use ($jobType, $installer, $package, $initialPackage) {
-                return $installer->cleanup($jobType, $package, $initialPackage);
-            })->then(function () use ($jobType, $runScripts, $dispatcher, $installManager, $devMode, $repo, $operations, $operation) {
+            $promise = $promise->then(function () use ($opType, $installManager, $repo, $operation) {
+                return $installManager->$opType($repo, $operation);
+            })->then(function () use ($opType, $installer, $package, $initialPackage) {
+                return $installer->cleanup($opType, $package, $initialPackage);
+            })->then(function () use ($opType, $runScripts, $dispatcher, $installManager, $devMode, $repo, $operations, $operation) {
                 $repo->write($devMode, $installManager);
 
-                $event = 'Composer\Installer\PackageEvents::POST_PACKAGE_'.strtoupper($jobType);
+                $event = 'Composer\Installer\PackageEvents::POST_PACKAGE_'.strtoupper($opType);
                 if (defined($event) && $runScripts && $dispatcher) {
                     $dispatcher->dispatchPackageEvent(constant($event), $devMode, $repo, $operations, $operation);
                 }
-            }, function ($e) use ($jobType, $installer, $package, $initialPackage, $loop, $io) {
-                $io->writeError('    <error>' . ucfirst($jobType) .' of '.$package->getPrettyName().' failed</error>');
+            }, function ($e) use ($opType, $installer, $package, $initialPackage, $loop, $io) {
+                $io->writeError('    <error>' . ucfirst($opType) .' of '.$package->getPrettyName().' failed</error>');
 
-                $promise = $installer->cleanup($jobType, $package, $initialPackage);
+                $promise = $installer->cleanup($opType, $package, $initialPackage);
                 if ($promise) {
                     $loop->wait(array($promise));
                 }

src/Composer/Package/Link.php

@@ -123,6 +123,6 @@ class Link
      */
     public function getPrettyString(PackageInterface $sourcePackage)
     {
-        return $sourcePackage->getPrettyString().' '.$this->description.' '.$this->target.' '.$this->constraint->getPrettyString().'';
+        return $sourcePackage->getPrettyString().' '.$this->description.' '.$this->target.($this->constraint ? ' '.$this->constraint->getPrettyString() : '');
     }
 }

src/Composer/Repository/RepositorySet.php

@@ -157,7 +157,7 @@ class RepositorySet
         $request = new Request($lockedRepo);
 
         foreach ($packageNames as $packageName) {
-            $request->install($packageName);
+            $request->require($packageName);
         }
 
         return $this->createPool($request);

tests/Composer/Test/DependencyResolver/PoolBuilderTest.php

@@ -82,7 +82,7 @@ class PoolBuilderTest extends TestCase
 
         $request = new Request();
         foreach ($requestData as $package => $constraint) {
-            $request->install($package, $parser->parseConstraints($constraint));
+            $request->require($package, $parser->parseConstraints($constraint));
         }
 
         foreach ($fixed as $fixedPackage) {

tests/Composer/Test/DependencyResolver/RequestTest.php

@@ -30,13 +30,13 @@ class RequestTest extends TestCase
         $repo->addPackage($foobar);
 
         $request = new Request();
-        $request->install('foo');
+        $request->require('foo');
 
         $this->assertEquals(
             array(
-                array('cmd' => 'install', 'packageName' => 'foo', 'constraint' => null),
+                'foo' => null,
             ),
-            $request->getJobs()
+            $request->getRequires()
         );
     }
 
@@ -52,13 +52,13 @@ class RequestTest extends TestCase
         $repo2->addPackage($foo2);
 
         $request = new Request();
-        $request->install('foo', $constraint = $this->getVersionConstraint('=', '1'));
+        $request->require('foo', $constraint = $this->getVersionConstraint('=', '1'));
 
         $this->assertEquals(
             array(
-                    array('cmd' => 'install', 'packageName' => 'foo', 'constraint' => $constraint),
+                'foo' => $constraint,
             ),
-            $request->getJobs()
+            $request->getRequires()
         );
     }
 }

tests/Composer/Test/DependencyResolver/RuleSetIteratorTest.php

@@ -30,9 +30,9 @@ class RuleSetIteratorTest extends TestCase
         $this->pool = new Pool();
 
         $this->rules = array(
-            RuleSet::TYPE_JOB => array(
-                new GenericRule(array(), Rule::RULE_JOB_INSTALL, null),
-                new GenericRule(array(), Rule::RULE_JOB_INSTALL, null),
+            RuleSet::TYPE_REQUEST => array(
+                new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null),
+                new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null),
             ),
             RuleSet::TYPE_LEARNED => array(
                 new GenericRule(array(), Rule::RULE_INTERNAL_ALLOW_UPDATE, null),
@@ -51,8 +51,8 @@ class RuleSetIteratorTest extends TestCase
         }
 
         $expected = array(
-            $this->rules[RuleSet::TYPE_JOB][0],
-            $this->rules[RuleSet::TYPE_JOB][1],
+            $this->rules[RuleSet::TYPE_REQUEST][0],
+            $this->rules[RuleSet::TYPE_REQUEST][1],
             $this->rules[RuleSet::TYPE_LEARNED][0],
         );
 
@@ -69,8 +69,8 @@ class RuleSetIteratorTest extends TestCase
         }
 
         $expected = array(
-            RuleSet::TYPE_JOB,
-            RuleSet::TYPE_JOB,
+            RuleSet::TYPE_REQUEST,
+            RuleSet::TYPE_REQUEST,
             RuleSet::TYPE_LEARNED,
         );
 

tests/Composer/Test/DependencyResolver/RuleSetTest.php

@@ -26,9 +26,9 @@ class RuleSetTest extends TestCase
     {
         $rules = array(
             RuleSet::TYPE_PACKAGE => array(),
-            RuleSet::TYPE_JOB => array(
-                new GenericRule(array(1), Rule::RULE_JOB_INSTALL, null),
-                new GenericRule(array(2), Rule::RULE_JOB_INSTALL, null),
+            RuleSet::TYPE_REQUEST => array(
+                new GenericRule(array(1), Rule::RULE_ROOT_REQUIRE, null),
+                new GenericRule(array(2), Rule::RULE_ROOT_REQUIRE, null),
             ),
             RuleSet::TYPE_LEARNED => array(
                 new GenericRule(array(), Rule::RULE_INTERNAL_ALLOW_UPDATE, null),
@@ -37,9 +37,9 @@ class RuleSetTest extends TestCase
 
         $ruleSet = new RuleSet;
 
-        $ruleSet->add($rules[RuleSet::TYPE_JOB][0], RuleSet::TYPE_JOB);
+        $ruleSet->add($rules[RuleSet::TYPE_REQUEST][0], RuleSet::TYPE_REQUEST);
         $ruleSet->add($rules[RuleSet::TYPE_LEARNED][0], RuleSet::TYPE_LEARNED);
-        $ruleSet->add($rules[RuleSet::TYPE_JOB][1], RuleSet::TYPE_JOB);
+        $ruleSet->add($rules[RuleSet::TYPE_REQUEST][1], RuleSet::TYPE_REQUEST);
 
         $this->assertEquals($rules, $ruleSet->getRules());
     }
@@ -47,20 +47,20 @@ class RuleSetTest extends TestCase
     public function testAddIgnoresDuplicates()
     {
         $rules = array(
-            RuleSet::TYPE_JOB => array(
-                new GenericRule(array(), Rule::RULE_JOB_INSTALL, null),
-                new GenericRule(array(), Rule::RULE_JOB_INSTALL, null),
-                new GenericRule(array(), Rule::RULE_JOB_INSTALL, null),
+            RuleSet::TYPE_REQUEST => array(
+                new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null),
+                new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null),
+                new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null),
             ),
         );
 
         $ruleSet = new RuleSet;
 
-        $ruleSet->add($rules[RuleSet::TYPE_JOB][0], RuleSet::TYPE_JOB);
-        $ruleSet->add($rules[RuleSet::TYPE_JOB][1], RuleSet::TYPE_JOB);
-        $ruleSet->add($rules[RuleSet::TYPE_JOB][2], RuleSet::TYPE_JOB);
+        $ruleSet->add($rules[RuleSet::TYPE_REQUEST][0], RuleSet::TYPE_REQUEST);
+        $ruleSet->add($rules[RuleSet::TYPE_REQUEST][1], RuleSet::TYPE_REQUEST);
+        $ruleSet->add($rules[RuleSet::TYPE_REQUEST][2], RuleSet::TYPE_REQUEST);
 
-        $this->assertCount(1, $ruleSet->getIteratorFor(array(RuleSet::TYPE_JOB)));
+        $this->assertCount(1, $ruleSet->getIteratorFor(array(RuleSet::TYPE_REQUEST)));
     }
 
     /**
@@ -70,15 +70,15 @@ class RuleSetTest extends TestCase
     {
         $ruleSet = new RuleSet;
 
-        $ruleSet->add(new GenericRule(array(), Rule::RULE_JOB_INSTALL, null), 7);
+        $ruleSet->add(new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null), 7);
     }
 
     public function testCount()
     {
         $ruleSet = new RuleSet;
 
-        $ruleSet->add(new GenericRule(array(1), Rule::RULE_JOB_INSTALL, null), RuleSet::TYPE_JOB);
-        $ruleSet->add(new GenericRule(array(2), Rule::RULE_JOB_INSTALL, null), RuleSet::TYPE_JOB);
+        $ruleSet->add(new GenericRule(array(1), Rule::RULE_ROOT_REQUIRE, null), RuleSet::TYPE_REQUEST);
+        $ruleSet->add(new GenericRule(array(2), Rule::RULE_ROOT_REQUIRE, null), RuleSet::TYPE_REQUEST);
 
         $this->assertEquals(2, $ruleSet->count());
     }
@@ -87,8 +87,8 @@ class RuleSetTest extends TestCase
     {
         $ruleSet = new RuleSet;
 
-        $rule = new GenericRule(array(), Rule::RULE_JOB_INSTALL, null);
-        $ruleSet->add($rule, RuleSet::TYPE_JOB);
+        $rule = new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null);
+        $ruleSet->add($rule, RuleSet::TYPE_REQUEST);
 
         $this->assertSame($rule, $ruleSet->ruleById[0]);
     }
@@ -97,9 +97,9 @@ class RuleSetTest extends TestCase
     {
         $ruleSet = new RuleSet;
 
-        $rule1 = new GenericRule(array(1), Rule::RULE_JOB_INSTALL, null);
-        $rule2 = new GenericRule(array(2), Rule::RULE_JOB_INSTALL, null);
-        $ruleSet->add($rule1, RuleSet::TYPE_JOB);
+        $rule1 = new GenericRule(array(1), Rule::RULE_ROOT_REQUIRE, null);
+        $rule2 = new GenericRule(array(2), Rule::RULE_ROOT_REQUIRE, null);
+        $ruleSet->add($rule1, RuleSet::TYPE_REQUEST);
         $ruleSet->add($rule2, RuleSet::TYPE_LEARNED);
 
         $iterator = $ruleSet->getIterator();
@@ -112,10 +112,10 @@ class RuleSetTest extends TestCase
     public function testGetIteratorFor()
     {
         $ruleSet = new RuleSet;
-        $rule1 = new GenericRule(array(1), Rule::RULE_JOB_INSTALL, null);
-        $rule2 = new GenericRule(array(2), Rule::RULE_JOB_INSTALL, null);
+        $rule1 = new GenericRule(array(1), Rule::RULE_ROOT_REQUIRE, null);
+        $rule2 = new GenericRule(array(2), Rule::RULE_ROOT_REQUIRE, null);
 
-        $ruleSet->add($rule1, RuleSet::TYPE_JOB);
+        $ruleSet->add($rule1, RuleSet::TYPE_REQUEST);
         $ruleSet->add($rule2, RuleSet::TYPE_LEARNED);
 
         $iterator = $ruleSet->getIteratorFor(RuleSet::TYPE_LEARNED);
@@ -126,13 +126,13 @@ class RuleSetTest extends TestCase
     public function testGetIteratorWithout()
     {
         $ruleSet = new RuleSet;
-        $rule1 = new GenericRule(array(1), Rule::RULE_JOB_INSTALL, null);
-        $rule2 = new GenericRule(array(2), Rule::RULE_JOB_INSTALL, null);
+        $rule1 = new GenericRule(array(1), Rule::RULE_ROOT_REQUIRE, null);
+        $rule2 = new GenericRule(array(2), Rule::RULE_ROOT_REQUIRE, null);
 
-        $ruleSet->add($rule1, RuleSet::TYPE_JOB);
+        $ruleSet->add($rule1, RuleSet::TYPE_REQUEST);
         $ruleSet->add($rule2, RuleSet::TYPE_LEARNED);
 
-        $iterator = $ruleSet->getIteratorWithout(RuleSet::TYPE_JOB);
+        $iterator = $ruleSet->getIteratorWithout(RuleSet::TYPE_REQUEST);
 
         $this->assertSame($rule2, $iterator->current());
     }
@@ -145,10 +145,10 @@ class RuleSetTest extends TestCase
 
         $ruleSet = new RuleSet;
         $literal = $p->getId();
-        $rule = new GenericRule(array($literal), Rule::RULE_JOB_INSTALL, null);
+        $rule = new GenericRule(array($literal), Rule::RULE_ROOT_REQUIRE, array('packageName' => 'foo/bar', 'constraint' => null));
 
-        $ruleSet->add($rule, RuleSet::TYPE_JOB);
+        $ruleSet->add($rule, RuleSet::TYPE_REQUEST);
 
-        $this->assertContains('JOB     : Install command rule (install foo 2.1)', $ruleSet->getPrettyString($pool));
+        $this->assertContains('REQUEST : No package found to satisfy root composer.json require foo/bar', $ruleSet->getPrettyString($pool));
     }
 }

tests/Composer/Test/DependencyResolver/RuleTest.php

@@ -17,6 +17,7 @@ use Composer\DependencyResolver\Rule;
 use Composer\DependencyResolver\RuleSet;
 use Composer\DependencyResolver\Pool;
 use Composer\Package\BasePackage;
+use Composer\Package\Link;
 use Composer\Repository\ArrayRepository;
 use Composer\Test\TestCase;
 
@@ -24,7 +25,7 @@ class RuleTest extends TestCase
 {
     public function testGetHash()
     {
-        $rule = new GenericRule(array(123), Rule::RULE_JOB_INSTALL, null);
+        $rule = new GenericRule(array(123), Rule::RULE_ROOT_REQUIRE, null);
 
         $hash = unpack('ihash', md5('123', true));
         $this->assertEquals($hash['hash'], $rule->getHash());
@@ -32,39 +33,39 @@ class RuleTest extends TestCase
 
     public function testEqualsForRulesWithDifferentHashes()
     {
-        $rule = new GenericRule(array(1, 2), Rule::RULE_JOB_INSTALL, null);
-        $rule2 = new GenericRule(array(1, 3), Rule::RULE_JOB_INSTALL, null);
+        $rule = new GenericRule(array(1, 2), Rule::RULE_ROOT_REQUIRE, null);
+        $rule2 = new GenericRule(array(1, 3), Rule::RULE_ROOT_REQUIRE, null);
 
         $this->assertFalse($rule->equals($rule2));
     }
 
     public function testEqualsForRulesWithDifferLiteralsQuantity()
     {
-        $rule = new GenericRule(array(1, 12), Rule::RULE_JOB_INSTALL, null);
-        $rule2 = new GenericRule(array(1), Rule::RULE_JOB_INSTALL, null);
+        $rule = new GenericRule(array(1, 12), Rule::RULE_ROOT_REQUIRE, null);
+        $rule2 = new GenericRule(array(1), Rule::RULE_ROOT_REQUIRE, null);
 
         $this->assertFalse($rule->equals($rule2));
     }
 
     public function testEqualsForRulesWithSameLiterals()
     {
-        $rule = new GenericRule(array(1, 12), Rule::RULE_JOB_INSTALL, null);
-        $rule2 = new GenericRule(array(1, 12), Rule::RULE_JOB_INSTALL, null);
+        $rule = new GenericRule(array(1, 12), Rule::RULE_ROOT_REQUIRE, null);
+        $rule2 = new GenericRule(array(1, 12), Rule::RULE_ROOT_REQUIRE, null);
 
         $this->assertTrue($rule->equals($rule2));
     }
 
     public function testSetAndGetType()
     {
-        $rule = new GenericRule(array(), Rule::RULE_JOB_INSTALL, null);
-        $rule->setType(RuleSet::TYPE_JOB);
+        $rule = new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null);
+        $rule->setType(RuleSet::TYPE_REQUEST);
 
-        $this->assertEquals(RuleSet::TYPE_JOB, $rule->getType());
+        $this->assertEquals(RuleSet::TYPE_REQUEST, $rule->getType());
     }
 
     public function testEnable()
     {
-        $rule = new GenericRule(array(), Rule::RULE_JOB_INSTALL, null);
+        $rule = new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null);
         $rule->disable();
         $rule->enable();
 
@@ -74,7 +75,7 @@ class RuleTest extends TestCase
 
     public function testDisable()
     {
-        $rule = new GenericRule(array(), Rule::RULE_JOB_INSTALL, null);
+        $rule = new GenericRule(array(), Rule::RULE_ROOT_REQUIRE, null);
         $rule->enable();
         $rule->disable();
 
@@ -84,8 +85,8 @@ class RuleTest extends TestCase
 
     public function testIsAssertions()
     {
-        $rule = new GenericRule(array(1, 12), Rule::RULE_JOB_INSTALL, null);
-        $rule2 = new GenericRule(array(1), Rule::RULE_JOB_INSTALL, null);
+        $rule = new GenericRule(array(1, 12), Rule::RULE_ROOT_REQUIRE, null);
+        $rule2 = new GenericRule(array(1), Rule::RULE_ROOT_REQUIRE, null);
 
         $this->assertFalse($rule->isAssertion());
         $this->assertTrue($rule2->isAssertion());
@@ -98,8 +99,8 @@ class RuleTest extends TestCase
             $p2 = $this->getPackage('baz', '1.1'),
         ));
 
-        $rule = new GenericRule(array($p1->getId(), -$p2->getId()), Rule::RULE_JOB_INSTALL, null);
+        $rule = new GenericRule(array($p1->getId(), -$p2->getId()), Rule::RULE_PACKAGE_REQUIRES, new Link('baz', 'foo'));
 
-        $this->assertEquals('Install command rule (don\'t install baz 1.1|install foo 2.1)', $rule->getPrettyString($pool));
+        $this->assertEquals('baz 1.1 relates to foo -> satisfiable by foo[2.1].', $rule->getPrettyString($pool));
     }
 }

tests/Composer/Test/DependencyResolver/SolverTest.php

@@ -50,7 +50,7 @@ class SolverTest extends TestCase
         $this->repo->addPackage($packageA = $this->getPackage('A', '1.0'));
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageA),
@@ -72,7 +72,7 @@ class SolverTest extends TestCase
         $this->repo->addPackage($this->getPackage('A', '1.0'));
         $this->reposComplete();
 
-        $this->request->install('B', $this->getVersionConstraint('==', '1'));
+        $this->request->require('B', $this->getVersionConstraint('==', '1'));
 
         $this->createSolver();
         try {
@@ -97,7 +97,7 @@ class SolverTest extends TestCase
         $this->repoSet->addRepository($repo1);
         $this->repoSet->addRepository($repo2);
 
-        $this->request->install('foo');
+        $this->request->require('foo');
 
         $this->checkSolverResult(array(
                 array('job' => 'install', 'package' => $foo1),
@@ -114,7 +114,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageB),
@@ -140,7 +140,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $newPackageB11),
@@ -164,9 +164,9 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
-        $this->request->install('B');
-        $this->request->install('C');
+        $this->request->require('A');
+        $this->request->require('B');
+        $this->request->require('C');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageA),
@@ -206,7 +206,7 @@ class SolverTest extends TestCase
         $packageA->setRequires(array('b' => new Link('A', 'B', $this->getVersionConstraint('>=', '1.0.0.0'), 'requires')));
 
         $this->request->fixPackage($packageA);
-        $this->request->install('B', $this->getVersionConstraint('=', '1.1.0.0'));
+        $this->request->require('B', $this->getVersionConstraint('=', '1.1.0.0'));
 
         $this->checkSolverResult(array(
             array('job' => 'update', 'from' => $packageB, 'to' => $newPackageB),
@@ -219,7 +219,7 @@ class SolverTest extends TestCase
         $this->repo->addPackage($newPackageA = $this->getPackage('A', '1.1'));
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array(
             array('job' => 'update', 'from' => $packageA, 'to' => $newPackageA),
@@ -238,7 +238,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array(
             array('job' => 'update', 'from' => $packageB, 'to' => $newPackageB),
@@ -252,7 +252,7 @@ class SolverTest extends TestCase
         $this->repo->addPackage($this->getPackage('A', '1.0'));
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array());
     }
@@ -266,7 +266,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
         $this->request->fixPackage($packageB);
 
         $this->checkSolverResult(array(
@@ -281,7 +281,7 @@ class SolverTest extends TestCase
         $this->repo->addPackage($this->getPackage('A', '2.0'));
         $this->reposComplete();
 
-        $this->request->install('A', $this->getVersionConstraint('<', '2.0.0.0'));
+        $this->request->require('A', $this->getVersionConstraint('<', '2.0.0.0'));
 
         $this->checkSolverResult(array(array(
             'job' => 'update',
@@ -297,7 +297,7 @@ class SolverTest extends TestCase
         $this->repo->addPackage($this->getPackage('A', '2.0'));
         $this->reposComplete();
 
-        $this->request->install('A', $this->getVersionConstraint('<', '2.0.0.0'));
+        $this->request->require('A', $this->getVersionConstraint('<', '2.0.0.0'));
 
         $this->checkSolverResult(array(array(
             'job' => 'update',
@@ -314,7 +314,7 @@ class SolverTest extends TestCase
         $this->repo->addPackage($this->getPackage('A', '2.0'));
         $this->reposComplete();
 
-        $this->request->install('A', $this->getVersionConstraint('<', '2.0.0.0'));
+        $this->request->require('A', $this->getVersionConstraint('<', '2.0.0.0'));
 
         $this->checkSolverResult(array(
             array(
@@ -343,8 +343,8 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
-        $this->request->install('C');
+        $this->request->require('A');
+        $this->request->require('C');
 
         $this->checkSolverResult(array(
             array('job' => 'remove',  'package' => $packageD),
@@ -365,7 +365,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $middlePackageB),
@@ -381,7 +381,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('B');
+        $this->request->require('B');
 
         $this->checkSolverResult(array(
             array('job' => 'remove', 'package' => $packageA),
@@ -396,7 +396,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageA),
@@ -412,7 +412,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         // must explicitly pick the provider, so error in this case
         $this->setExpectedException('Composer\DependencyResolver\SolverProblemsException');
@@ -430,7 +430,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageB),
@@ -447,7 +447,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->setExpectedException('Composer\DependencyResolver\SolverProblemsException');
         $this->createSolver();
@@ -464,8 +464,8 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
-        $this->request->install('Q');
+        $this->request->require('A');
+        $this->request->require('Q');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageQ),
@@ -502,7 +502,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('X');
+        $this->request->require('X');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $newPackageB),
@@ -521,7 +521,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageB2),
@@ -545,8 +545,8 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
-        $this->request->install('C');
+        $this->request->require('A');
+        $this->request->require('C');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageB),
@@ -583,8 +583,8 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
-        $this->request->install('D');
+        $this->request->require('A');
+        $this->request->require('D');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageD2),
@@ -619,7 +619,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('C', $this->getVersionConstraint('==', '2.0.0.0-dev'));
+        $this->request->require('C', $this->getVersionConstraint('==', '2.0.0.0-dev'));
 
         $this->setExpectedException('Composer\DependencyResolver\SolverProblemsException');
 
@@ -637,8 +637,8 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
-        $this->request->install('B');
+        $this->request->require('A');
+        $this->request->require('B');
 
         $this->createSolver();
         try {
@@ -650,9 +650,9 @@ class SolverTest extends TestCase
 
             $msg = "\n";
             $msg .= "  Problem 1\n";
-            $msg .= "    - Installation request for a -> satisfiable by A[1.0].\n";
+            $msg .= "    - Root composer.json requires a -> satisfiable by A[1.0].\n";
             $msg .= "    - B 1.0 conflicts with A[1.0].\n";
-            $msg .= "    - Installation request for b -> satisfiable by B[1.0].\n";
+            $msg .= "    - Root composer.json requires b -> satisfiable by B[1.0].\n";
             $this->assertEquals($msg, $e->getMessage());
         }
     }
@@ -668,7 +668,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->createSolver();
         try {
@@ -681,7 +681,7 @@ class SolverTest extends TestCase
 
             $msg = "\n";
             $msg .= "  Problem 1\n";
-            $msg .= "    - Installation request for a -> satisfiable by A[1.0].\n";
+            $msg .= "    - Root composer.json requires a -> satisfiable by A[1.0].\n";
             $msg .= "    - A 1.0 requires b >= 2.0 -> no matching package found.\n\n";
             $msg .= "Potential causes:\n";
             $msg .= " - A typo in the package name\n";
@@ -716,7 +716,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->createSolver();
         try {
@@ -733,7 +733,7 @@ class SolverTest extends TestCase
             $msg .= "    - B 1.0 requires c >= 1.0 -> satisfiable by C[1.0].\n";
             $msg .= "    - Same name, can only install one of: B[0.9, 1.0].\n";
             $msg .= "    - A 1.0 requires b >= 1.0 -> satisfiable by B[1.0].\n";
-            $msg .= "    - Installation request for a -> satisfiable by A[1.0].\n";
+            $msg .= "    - Root composer.json requires a -> satisfiable by A[1.0].\n";
             $this->assertEquals($msg, $e->getMessage());
         }
     }
@@ -756,8 +756,8 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('symfony/twig-bridge');
-        $this->request->install('twig/twig');
+        $this->request->require('symfony/twig-bridge');
+        $this->request->require('twig/twig');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageTwig16),
@@ -782,7 +782,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A', $this->getVersionConstraint('==', '1.1.0.0'));
+        $this->request->require('A', $this->getVersionConstraint('==', '1.1.0.0'));
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageB),
@@ -804,8 +804,8 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A', $this->getVersionConstraint('==', '2.0'));
-        $this->request->install('B');
+        $this->request->require('A', $this->getVersionConstraint('==', '2.0'));
+        $this->request->require('B');
 
         $this->checkSolverResult(array(
             array('job' => 'install', 'package' => $packageA),
@@ -865,7 +865,7 @@ class SolverTest extends TestCase
 
         $this->reposComplete();
 
-        $this->request->install('A');
+        $this->request->require('A');
 
         $this->createSolver();
 
@@ -905,14 +905,14 @@ class SolverTest extends TestCase
 
         $result = array();
         foreach ($transaction->getOperations() as $operation) {
-            if ('update' === $operation->getJobType()) {
+            if ('update' === $operation->getOperationType()) {
                 $result[] = array(
                     'job' => 'update',
                     'from' => $operation->getInitialPackage(),
                     'to' => $operation->getTargetPackage(),
                 );
             } else {
-                $job = ('uninstall' === $operation->getJobType() ? 'remove' : 'install');
+                $job = ('uninstall' === $operation->getOperationType() ? 'remove' : 'install');
                 $result[] = array(
                     'job' => $job,
                     'package' => $operation->getPackage(),

tests/Composer/Test/DependencyResolver/TransactionTest.php

@@ -71,7 +71,7 @@ class TransactionTest extends TestCase
     {
         $result = array();
         foreach ($transaction->getOperations() as $operation) {
-            if ('update' === $operation->getJobType()) {
+            if ('update' === $operation->getOperationType()) {
                 $result[] = array(
                     'job' => 'update',
                     'from' => $operation->getInitialPackage(),
@@ -79,7 +79,7 @@ class TransactionTest extends TestCase
                 );
             } else {
                 $result[] = array(
-                    'job' => $operation->getJobType(),
+                    'job' => $operation->getOperationType(),
                     'package' => $operation->getPackage(),
                 );
             }

tests/Composer/Test/Fixtures/installer/broken-deps-do-not-replace.test

@@ -28,7 +28,7 @@ Your requirements could not be resolved to an installable set of packages.
   Problem 1
     - c/c 1.0.0 requires x/x 1.0 -> no matching package found.
     - b/b 1.0.0 requires c/c 1.* -> satisfiable by c/c[1.0.0].
-    - Installation request for b/b 1.* -> satisfiable by b/b[1.0.0].
+    - Root composer.json requires b/b 1.* -> satisfiable by b/b[1.0.0].
 
 Potential causes:
  - A typo in the package name

tests/Composer/Test/Fixtures/installer/github-issues-4319.test

@@ -36,7 +36,7 @@ Updating dependencies
 Your requirements could not be resolved to an installable set of packages.
 
   Problem 1
-    - Installation request for a/a ~1.0 -> satisfiable by a/a[1.0.0].
+    - Root composer.json requires a/a ~1.0 -> satisfiable by a/a[1.0.0].
     - a/a 1.0.0 requires php 5.5 -> your PHP version (%s) overridden by "config.platform.php" version (5.3) does not satisfy that requirement.
 
 --EXPECT--

tests/Composer/Test/Fixtures/installer/solver-problems.test

@@ -63,7 +63,7 @@ Your requirements could not be resolved to an installable set of packages.
   Problem 3
     - The requested package stable-requiree-excluded/pkg could not be found in any version, there may be a typo in the package name.
   Problem 4
-    - Installation request for requirer/pkg 1.* -> satisfiable by requirer/pkg[1.0.0].
+    - Root composer.json requires requirer/pkg 1.* -> satisfiable by requirer/pkg[1.0.0].
     - requirer/pkg 1.0.0 requires dependency/pkg 1.0.0 -> no matching package found.
 
 Potential causes:

tests/Composer/Test/Mock/InstallationManagerMock.php

@@ -38,7 +38,7 @@ class InstallationManagerMock extends InstallationManager
     public function execute(RepositoryInterface $repo, array $operations, $devMode = true, $runScripts = true)
     {
         foreach ($operations as $operation) {
-            $method = $operation->getJobType();
+            $method = $operation->getOperationType();
             // skipping download() step here for tests
             $this->$method($repo, $operation);
         }