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1   package org.apache.maven;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.io.File;
23  import java.util.ArrayList;
24  import java.util.Arrays;
25  import java.util.Collection;
26  import java.util.Collections;
27  import java.util.Date;
28  import java.util.HashSet;
29  import java.util.LinkedHashMap;
30  import java.util.LinkedHashSet;
31  import java.util.List;
32  import java.util.Map;
33  
34  import org.apache.maven.artifact.ArtifactUtils;
35  import org.apache.maven.execution.DefaultMavenExecutionResult;
36  import org.apache.maven.execution.ExecutionEvent;
37  import org.apache.maven.execution.MavenExecutionRequest;
38  import org.apache.maven.execution.MavenExecutionResult;
39  import org.apache.maven.execution.MavenSession;
40  import org.apache.maven.execution.ProjectDependencyGraph;
41  import org.apache.maven.graph.GraphBuilder;
42  import org.apache.maven.internal.aether.DefaultRepositorySystemSessionFactory;
43  import org.apache.maven.lifecycle.internal.ExecutionEventCatapult;
44  import org.apache.maven.lifecycle.internal.LifecycleStarter;
45  import org.apache.maven.model.Prerequisites;
46  import org.apache.maven.model.building.ModelProblem;
47  import org.apache.maven.model.building.Result;
48  import org.apache.maven.plugin.LegacySupport;
49  import org.apache.maven.project.MavenProject;
50  import org.apache.maven.project.ProjectBuilder;
51  import org.apache.maven.repository.LocalRepositoryNotAccessibleException;
52  import org.apache.maven.session.scope.internal.SessionScope;
53  import org.codehaus.plexus.PlexusContainer;
54  import org.codehaus.plexus.component.annotations.Component;
55  import org.codehaus.plexus.component.annotations.Requirement;
56  import org.codehaus.plexus.component.repository.exception.ComponentLookupException;
57  import org.codehaus.plexus.logging.Logger;
58  import org.eclipse.aether.DefaultRepositorySystemSession;
59  import org.eclipse.aether.RepositorySystemSession;
60  import org.eclipse.aether.repository.WorkspaceReader;
61  import org.eclipse.aether.util.repository.ChainedWorkspaceReader;
62  
63  /**
64   * @author Jason van Zyl
65   */
66  @Component( role = Maven.class )
67  public class DefaultMaven
68      implements Maven
69  {
70  
71      @Requirement
72      private Logger logger;
73  
74      @Requirement
75      protected ProjectBuilder projectBuilder;
76  
77      @Requirement
78      private LifecycleStarter lifecycleStarter;
79  
80      @Requirement
81      protected PlexusContainer container;
82  
83      @Requirement
84      private ExecutionEventCatapult eventCatapult;
85  
86      @Requirement
87      private LegacySupport legacySupport;
88  
89      @Requirement
90      private SessionScope sessionScope;
91  
92      @Requirement
93      private DefaultRepositorySystemSessionFactory repositorySessionFactory;
94  
95      @Requirement( hint = GraphBuilder.HINT )
96      private GraphBuilder graphBuilder;
97  
98      @Override
99      public MavenExecutionResult execute( MavenExecutionRequest request )
100     {
101         MavenExecutionResult result;
102 
103         try
104         {
105             result = doExecute( request );
106         }
107         catch ( OutOfMemoryError e )
108         {
109             result = addExceptionToResult( new DefaultMavenExecutionResult(), e );
110         }
111         catch ( RuntimeException e )
112         {
113             // TODO Hack to make the cycle detection the same for the new graph builder
114             if ( e.getCause() instanceof ProjectCycleException )
115             {
116                 result = addExceptionToResult( new DefaultMavenExecutionResult(), e.getCause() );
117             }
118             else
119             {
120                 result = addExceptionToResult( new DefaultMavenExecutionResult(),
121                                                new InternalErrorException( "Internal error: " + e, e ) );
122             }
123         }
124         finally
125         {
126             legacySupport.setSession( null );
127         }
128 
129         return result;
130     }
131 
132     //
133     // 1) Setup initial properties.
134     //
135     // 2) Validate local repository directory is accessible.
136     //
137     // 3) Create RepositorySystemSession.
138     //
139     // 4) Create MavenSession.
140     //
141     // 5) Execute AbstractLifecycleParticipant.afterSessionStart(session)
142     //
143     // 6) Get reactor projects looking for general POM errors
144     //
145     // 7) Create ProjectDependencyGraph using trimming which takes into account --projects and reactor mode.
146     // This ensures that the projects passed into the ReactorReader are only those specified.
147     //
148     // 8) Create ReactorReader with the getProjectMap( projects ). NOTE that getProjectMap(projects) is the code that
149     // checks for duplicate projects definitions in the build. Ideally this type of duplicate checking should be
150     // part of getting the reactor projects in 6). The duplicate checking is conflated with getProjectMap(projects).
151     //
152     // 9) Execute AbstractLifecycleParticipant.afterProjectsRead(session)
153     //
154     // 10) Create ProjectDependencyGraph without trimming (as trimming was done in 7). A new topological sort is
155     // required after the execution of 9) as the AbstractLifecycleParticipants are free to mutate the MavenProject
156     // instances, which may change dependencies which can, in turn, affect the build order.
157     //
158     // 11) Execute LifecycleStarter.start()
159     //
160     @SuppressWarnings( "checkstyle:methodlength" )
161     private MavenExecutionResult doExecute( MavenExecutionRequest request )
162     {
163         request.setStartTime( new Date() );
164 
165         MavenExecutionResult result = new DefaultMavenExecutionResult();
166 
167         try
168         {
169             validateLocalRepository( request );
170         }
171         catch ( LocalRepositoryNotAccessibleException e )
172         {
173             return addExceptionToResult( result, e );
174         }
175 
176         //
177         // We enter the session scope right after the MavenSession creation and before any of the
178         // AbstractLifecycleParticipant lookups
179         // so that @SessionScoped components can be @Injected into AbstractLifecycleParticipants.
180         //
181         sessionScope.enter();
182         try
183         {
184             DefaultRepositorySystemSession repoSession =
185                 (DefaultRepositorySystemSession) newRepositorySession( request );
186             MavenSession session = new MavenSession( container, repoSession, request, result );
187 
188             sessionScope.seed( MavenSession.class, session );
189 
190             legacySupport.setSession( session );
191 
192             return doExecute( request, session, result, repoSession );
193         }
194         finally
195         {
196             sessionScope.exit();
197         }
198     }
199 
200     private MavenExecutionResult doExecute( MavenExecutionRequest request, MavenSession session,
201                                             MavenExecutionResult result, DefaultRepositorySystemSession repoSession )
202     {
203         try
204         {
205             // CHECKSTYLE_OFF: LineLength
206             for ( AbstractMavenLifecycleParticipant listener : getLifecycleParticipants( Collections.<MavenProject>emptyList() ) )
207             {
208                 listener.afterSessionStart( session );
209             }
210             // CHECKSTYLE_ON: LineLength
211         }
212         catch ( MavenExecutionException e )
213         {
214             return addExceptionToResult( result, e );
215         }
216 
217         eventCatapult.fire( ExecutionEvent.Type.ProjectDiscoveryStarted, session, null );
218 
219         Result<? extends ProjectDependencyGraph> graphResult = buildGraph( session, result );
220 
221         if ( graphResult.hasErrors() )
222         {
223             return addExceptionToResult( result, graphResult.getProblems().iterator().next().getException() );
224         }
225 
226         try
227         {
228             session.setProjectMap( getProjectMap( session.getProjects() ) );
229         }
230         catch ( DuplicateProjectException e )
231         {
232             return addExceptionToResult( result, e );
233         }
234 
235         try
236         {
237             setupWorkspaceReader( session, repoSession );
238         }
239         catch ( ComponentLookupException e )
240         {
241             return addExceptionToResult( result, e );
242         }
243 
244         repoSession.setReadOnly();
245 
246         ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
247         try
248         {
249             for ( AbstractMavenLifecycleParticipant listener : getLifecycleParticipants( session.getProjects() ) )
250             {
251                 Thread.currentThread().setContextClassLoader( listener.getClass().getClassLoader() );
252 
253                 listener.afterProjectsRead( session );
254             }
255         }
256         catch ( MavenExecutionException e )
257         {
258             return addExceptionToResult( result, e );
259         }
260         finally
261         {
262             Thread.currentThread().setContextClassLoader( originalClassLoader );
263         }
264 
265         //
266         // The projects need to be topologically after the participants have run their afterProjectsRead(session)
267         // because the participant is free to change the dependencies of a project which can potentially change the
268         // topological order of the projects, and therefore can potentially change the build order.
269         //
270         // Note that participants may affect the topological order of the projects but it is
271         // not expected that a participant will add or remove projects from the session.
272         //
273 
274         graphResult = buildGraph( session, result );
275 
276         if ( graphResult.hasErrors() )
277         {
278             return addExceptionToResult( result, graphResult.getProblems().iterator().next().getException() );
279         }
280 
281         try
282         {
283             if ( result.hasExceptions() )
284             {
285                 return result;
286             }
287 
288             result.setTopologicallySortedProjects( session.getProjects() );
289 
290             result.setProject( session.getTopLevelProject() );
291 
292             validatePrerequisitesForNonMavenPluginProjects( session.getProjects() );
293 
294             lifecycleStarter.execute( session );
295 
296             validateActivatedProfiles( session.getProjects(), request.getActiveProfiles() );
297 
298             if ( session.getResult().hasExceptions() )
299             {
300                 return addExceptionToResult( result, session.getResult().getExceptions().get( 0 ) );
301             }
302         }
303         finally
304         {
305             try
306             {
307                 afterSessionEnd( session.getProjects(), session );
308             }
309             catch ( MavenExecutionException e )
310             {
311                 return addExceptionToResult( result, e );
312             }
313         }
314 
315         return result;
316     }
317 
318     private void setupWorkspaceReader( MavenSession session, DefaultRepositorySystemSession repoSession )
319         throws ComponentLookupException
320     {
321         // Desired order of precedence for workspace readers before querying the local artifact repositories
322         List<WorkspaceReader> workspaceReaders = new ArrayList<WorkspaceReader>();
323         // 1) Reactor workspace reader
324         workspaceReaders.add( container.lookup( WorkspaceReader.class, ReactorReader.HINT ) );
325         // 2) Repository system session-scoped workspace reader
326         WorkspaceReader repoWorkspaceReader = repoSession.getWorkspaceReader();
327         if ( repoWorkspaceReader != null )
328         {
329             workspaceReaders.add( repoWorkspaceReader );
330         }
331         // 3) .. n) Project-scoped workspace readers
332         for ( WorkspaceReader workspaceReader : getProjectScopedExtensionComponents( session.getProjects(),
333                                                                                      WorkspaceReader.class ) )
334         {
335             if ( workspaceReaders.contains( workspaceReader ) )
336             {
337                 continue;
338             }
339             workspaceReaders.add( workspaceReader );
340         }
341         WorkspaceReader[] readers = workspaceReaders.toArray( new WorkspaceReader[0] );
342         repoSession.setWorkspaceReader( new ChainedWorkspaceReader( readers ) );
343 
344     }
345 
346     private void afterSessionEnd( Collection<MavenProject> projects, MavenSession session )
347         throws MavenExecutionException
348     {
349         ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
350         try
351         {
352             for ( AbstractMavenLifecycleParticipant listener : getLifecycleParticipants( projects ) )
353             {
354                 Thread.currentThread().setContextClassLoader( listener.getClass().getClassLoader() );
355 
356                 listener.afterSessionEnd( session );
357             }
358         }
359         finally
360         {
361             Thread.currentThread().setContextClassLoader( originalClassLoader );
362         }
363     }
364 
365     public RepositorySystemSession newRepositorySession( MavenExecutionRequest request )
366     {
367         return repositorySessionFactory.newRepositorySession( request );
368     }
369 
370     private void validateLocalRepository( MavenExecutionRequest request )
371         throws LocalRepositoryNotAccessibleException
372     {
373         File localRepoDir = request.getLocalRepositoryPath();
374 
375         logger.debug( "Using local repository at " + localRepoDir );
376 
377         localRepoDir.mkdirs();
378 
379         if ( !localRepoDir.isDirectory() )
380         {
381             throw new LocalRepositoryNotAccessibleException( "Could not create local repository at " + localRepoDir );
382         }
383     }
384 
385     private Collection<AbstractMavenLifecycleParticipant> getLifecycleParticipants( Collection<MavenProject> projects )
386     {
387         Collection<AbstractMavenLifecycleParticipant> lifecycleListeners = new LinkedHashSet<>();
388 
389         try
390         {
391             lifecycleListeners.addAll( container.lookupList( AbstractMavenLifecycleParticipant.class ) );
392         }
393         catch ( ComponentLookupException e )
394         {
395             // this is just silly, lookupList should return an empty list!
396             logger.warn( "Failed to lookup lifecycle participants: " + e.getMessage() );
397         }
398 
399         lifecycleListeners.addAll( getProjectScopedExtensionComponents( projects,
400                                                                         AbstractMavenLifecycleParticipant.class ) );
401 
402         return lifecycleListeners;
403     }
404 
405     protected <T> Collection<T> getProjectScopedExtensionComponents( Collection<MavenProject> projects, Class<T> role )
406     {
407 
408         Collection<T> foundComponents = new LinkedHashSet<>();
409         Collection<ClassLoader> scannedRealms = new HashSet<>();
410 
411         Thread currentThread = Thread.currentThread();
412         ClassLoader originalContextClassLoader = currentThread.getContextClassLoader();
413         try
414         {
415             for ( MavenProject project : projects )
416             {
417                 ClassLoader projectRealm = project.getClassRealm();
418 
419                 if ( projectRealm != null && scannedRealms.add( projectRealm ) )
420                 {
421                     currentThread.setContextClassLoader( projectRealm );
422 
423                     try
424                     {
425                         foundComponents.addAll( container.lookupList( role ) );
426                     }
427                     catch ( ComponentLookupException e )
428                     {
429                         // this is just silly, lookupList should return an empty list!
430                         logger.warn( "Failed to lookup " + role + ": " + e.getMessage() );
431                     }
432                 }
433             }
434             return foundComponents;
435         }
436         finally
437         {
438             currentThread.setContextClassLoader( originalContextClassLoader );
439         }
440     }
441 
442     private MavenExecutionResult addExceptionToResult( MavenExecutionResult result, Throwable e )
443     {
444         if ( !result.getExceptions().contains( e ) )
445         {
446             result.addException( e );
447         }
448 
449         return result;
450     }
451 
452     private void validatePrerequisitesForNonMavenPluginProjects( List<MavenProject> projects )
453     {
454         for ( MavenProject mavenProject : projects )
455         {
456             if ( !"maven-plugin".equals( mavenProject.getPackaging() ) )
457             {
458                 Prerequisites prerequisites = mavenProject.getPrerequisites();
459                 if ( prerequisites != null && prerequisites.getMaven() != null )
460                 {
461                     logger.warn( "The project " + mavenProject.getId() + " uses prerequisites"
462                         + " which is only intended for maven-plugin projects "
463                         + "but not for non maven-plugin projects. "
464                         + "For such purposes you should use the maven-enforcer-plugin. "
465                         + "See https://maven.apache.org/enforcer/enforcer-rules/requireMavenVersion.html" );
466                 }
467             }
468         }
469     }
470 
471     private void validateActivatedProfiles( List<MavenProject> projects, List<String> activeProfileIds )
472     {
473         Collection<String> notActivatedProfileIds = new LinkedHashSet<>( activeProfileIds );
474 
475         for ( MavenProject project : projects )
476         {
477             for ( List<String> profileIds : project.getInjectedProfileIds().values() )
478             {
479                 notActivatedProfileIds.removeAll( profileIds );
480             }
481         }
482 
483         for ( String notActivatedProfileId : notActivatedProfileIds )
484         {
485             logger.warn( "The requested profile \"" + notActivatedProfileId
486                 + "\" could not be activated because it does not exist." );
487         }
488     }
489 
490     private Map<String, MavenProject> getProjectMap( Collection<MavenProject> projects )
491         throws DuplicateProjectException
492     {
493         Map<String, MavenProject> index = new LinkedHashMap<>();
494         Map<String, List<File>> collisions = new LinkedHashMap<>();
495 
496         for ( MavenProject project : projects )
497         {
498             String projectId = ArtifactUtils.key( project.getGroupId(), project.getArtifactId(), project.getVersion() );
499 
500             MavenProject collision = index.get( projectId );
501 
502             if ( collision == null )
503             {
504                 index.put( projectId, project );
505             }
506             else
507             {
508                 List<File> pomFiles = collisions.get( projectId );
509 
510                 if ( pomFiles == null )
511                 {
512                     pomFiles = new ArrayList<>( Arrays.asList( collision.getFile(), project.getFile() ) );
513                     collisions.put( projectId, pomFiles );
514                 }
515                 else
516                 {
517                     pomFiles.add( project.getFile() );
518                 }
519             }
520         }
521 
522         if ( !collisions.isEmpty() )
523         {
524             throw new DuplicateProjectException( "Two or more projects in the reactor"
525                 + " have the same identifier, please make sure that <groupId>:<artifactId>:<version>"
526                 + " is unique for each project: " + collisions, collisions );
527         }
528 
529         return index;
530     }
531 
532     private Result<? extends ProjectDependencyGraph> buildGraph( MavenSession session, MavenExecutionResult result )
533     {
534         Result<? extends ProjectDependencyGraph> graphResult = graphBuilder.build( session );
535         for ( ModelProblem problem : graphResult.getProblems() )
536         {
537             if ( problem.getSeverity() == ModelProblem.Severity.WARNING )
538             {
539                 logger.warn( problem.toString() );
540             }
541             else
542             {
543                 logger.error( problem.toString() );
544             }
545         }
546 
547         if ( !graphResult.hasErrors() )
548         {
549             ProjectDependencyGraph projectDependencyGraph = graphResult.get();
550             session.setProjects( projectDependencyGraph.getSortedProjects() );
551             session.setAllProjects( projectDependencyGraph.getAllProjects() );
552             session.setProjectDependencyGraph( projectDependencyGraph );
553         }
554 
555         return graphResult;
556     }
557 
558     @Deprecated
559     // 5 January 2014
560     protected Logger getLogger()
561     {
562         return logger;
563     }
564 }