[MARTIFACT-78] diagnose reactor root and first

src/main/java/org/apache/maven/plugins/artifact/buildinfo/AbstractBuildinfoMojo.java

@@ -153,7 +153,7 @@ protected AbstractBuildinfoMojo(
     public void execute() throws MojoExecutionException {
         boolean mono = session.getProjects().size() == 1;
 
-        hasBadOutputTimestamp(outputTimestamp, getLog(), project, session.getProjects(), diagnose);
+        hasBadOutputTimestamp(outputTimestamp, getLog(), project, session, diagnose);
 
         if (!mono) {
             // if module skips install and/or deploy
@@ -179,17 +179,13 @@ public void execute() throws MojoExecutionException {
     }
 
     static boolean hasBadOutputTimestamp(
-            String outputTimestamp,
-            Log log,
-            MavenProject project,
-            List<MavenProject> reactorProjects,
-            boolean diagnose) {
+            String outputTimestamp, Log log, MavenProject project, MavenSession session, boolean diagnose) {
         Instant timestamp =
                 MavenArchiver.parseBuildOutputTimestamp(outputTimestamp).orElse(null);
         String effective = ((timestamp == null) ? "disabled" : DateTimeFormatter.ISO_INSTANT.format(timestamp));
 
         if (diagnose) {
-            diagnose(outputTimestamp, log, project, reactorProjects, effective);
+            diagnose(outputTimestamp, log, project, session, effective);
         }
 
         if (timestamp == null) {
@@ -215,7 +211,7 @@ static boolean hasBadOutputTimestamp(
         // check if timestamp defined in a project from reactor: info if it is not the case
         boolean parentInReactor = false;
         MavenProject reactorParent = project;
-        while (reactorProjects.contains(reactorParent.getParent())) {
+        while (session.getProjects().contains(reactorParent.getParent())) {
             parentInReactor = true;
             reactorParent = reactorParent.getParent();
         }
@@ -231,11 +227,18 @@ static boolean hasBadOutputTimestamp(
     }
 
     static void diagnose(
-            String outputTimestamp,
-            Log log,
-            MavenProject project,
-            List<MavenProject> reactorProjects,
-            String effective) {
+            String outputTimestamp, Log log, MavenProject project, MavenSession session, String effective) {
+        if (session.getProjects().size() > 1) {
+            log.info("reactor executionRoot = " + session.getTopLevelProject().getId());
+            log.info("reactor first = " + session.getProjects().get(0).getId());
+            MavenProject parent = session.getProjects().get(0).getParent();
+            log.info("reactor first parent = " + ((parent == null) ? parent : parent.getId()));
+            if (parent != null && session.getProjects().contains(parent)) {
+                // should not happen...
+                log.warn("reactor first parent = " + parent.getId() + " is in reactor");
+            }
+        }
+
         log.info("outputTimestamp = " + outputTimestamp
                 + (effective.equals(outputTimestamp) ? "" : (" => " + effective)));
 
@@ -254,14 +257,18 @@ static void diagnose(
                 + "        - project.build.outputTimestamp property from project original model = "
                 + originalModelProperty);
 
+        if (outputTimestamp == null) {
+            return;
+        }
+
         MavenProject parent = project.getParent();
         if (parent != null) {
             StringBuilder sb = new StringBuilder("Inheritance analysis property:" + System.lineSeparator()
                     + "        - current " + project.getId() + " property = " + projectProperty);
             while (parent != null) {
                 String parentProperty = parent.getProperties().getProperty("project.build.outputTimestamp");
                 sb.append(System.lineSeparator());
-                sb.append("        - " + (reactorProjects.contains(parent) ? "reactor" : "external") + " parent "
+                sb.append("        - " + (session.getProjects().contains(parent) ? "reactor" : "external") + " parent "
                         + parent.getId() + " property = " + parentProperty);
                 if (!projectProperty.equals(parentProperty)) {
                     break;
@@ -291,7 +298,7 @@ protected void copyAggregateToRoot(File aggregate) throws MojoExecutionException
         }
 
         // copy aggregate file to root target directory
-        MavenProject root = getExecutionRoot();
+        MavenProject root = session.getTopLevelProject();
         String extension = aggregate.getName().substring(aggregate.getName().lastIndexOf('.'));
         File rootCopy =
                 new File(root.getBuild().getDirectory(), root.getArtifactId() + '-' + root.getVersion() + extension);
@@ -325,7 +332,7 @@ protected BuildInfoWriter newBuildInfoWriter(PrintWriter p, boolean mono) {
      * @throws MojoExecutionException if anything goes wrong
      */
     protected Map<Artifact, String> generateBuildinfo(boolean mono) throws MojoExecutionException {
-        MavenProject root = mono ? project : getExecutionRoot();
+        MavenProject root = mono ? project : session.getTopLevelProject();
 
         buildinfoFile.getParentFile().mkdirs();
 
@@ -355,15 +362,6 @@ protected Map<Artifact, String> generateBuildinfo(boolean mono) throws MojoExecu
         }
     }
 
-    protected MavenProject getExecutionRoot() {
-        for (MavenProject p : session.getAllProjects()) {
-            if (p.isExecutionRoot()) {
-                return p;
-            }
-        }
-        return null;
-    }
-
     private MavenProject getLastProject() {
         int i = session.getProjects().size();
         while (i > 0) {

src/main/java/org/apache/maven/plugins/artifact/buildinfo/CheckBuildPlanMojo.java

@@ -108,8 +108,8 @@ protected MavenExecutionPlan calculateExecutionPlan() throws MojoExecutionExcept
 
     @Override
     public void execute() throws MojoExecutionException {
-        boolean fail = AbstractBuildinfoMojo.hasBadOutputTimestamp(
-                outputTimestamp, getLog(), project, session.getProjects(), diagnose);
+        boolean fail =
+                AbstractBuildinfoMojo.hasBadOutputTimestamp(outputTimestamp, getLog(), project, session, diagnose);
 
         // TODO check maven-jar-plugin module-info.class?
 

src/main/java/org/apache/maven/plugins/artifact/buildinfo/CompareMojo.java

@@ -137,7 +137,7 @@ protected void skip(MavenProject last) throws MojoExecutionException {
      * @throws MojoExecutionException if anything goes wrong
      */
     private void checkAgainstReference(Map<Artifact, String> artifacts, boolean mono) throws MojoExecutionException {
-        MavenProject root = mono ? project : getExecutionRoot();
+        MavenProject root = mono ? project : session.getTopLevelProject();
         File referenceDir = new File(root.getBuild().getDirectory(), "reference");
         referenceDir.mkdirs();
 
@@ -301,7 +301,7 @@ private String getRepositoryFilename(Artifact a) {
     }
 
     private String relative(File file) {
-        File basedir = getExecutionRoot().getBasedir();
+        File basedir = session.getTopLevelProject().getBasedir();
         int length = basedir.getPath().length();
         String path = file.getPath();
         return path.substring(length + 1);

src/main/java/org/apache/maven/plugins/artifact/buildinfo/DescribeBuildOutputMojo.java

@@ -72,7 +72,7 @@ public void execute() throws MojoExecutionException {
                 MavenArchiver.parseBuildOutputTimestamp(outputTimestamp).orElse(null);
         String effective = ((timestamp == null) ? "disabled" : DateTimeFormatter.ISO_INSTANT.format(timestamp));
 
-        diagnose(outputTimestamp, getLog(), project, session.getProjects(), effective);
+        diagnose(outputTimestamp, getLog(), project, session, effective);
         getLog().info("");
         describeBuildOutput();
     }
@@ -81,7 +81,7 @@ public void execute() throws MojoExecutionException {
     private BuildInfoWriter bi;
 
     private void describeBuildOutput() throws MojoExecutionException {
-        rootPath = getExecutionRoot().getBasedir().toPath();
+        rootPath = session.getTopLevelProject().getBasedir().toPath();
         bi = newBuildInfoWriter(null, false);
 
         Map<String, Long> groupIds = session.getProjects().stream()