Use all maven session project to resolve project loc

If the build is run with a limited set of projects the resolving of
project-loc does not work if the referenced project is not selected.

This now uses all projects of the reactor even if they are currently not
selected to resolve the variable.

tycho-core/src/main/java/org/eclipse/tycho/p2resolver/DefaultTargetDefinitionVariableResolver.java

@@ -12,17 +12,25 @@
  *******************************************************************************/
 package org.eclipse.tycho.p2resolver;
 
+import java.util.List;
 import java.util.function.Function;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import javax.inject.Inject;
+
+import org.apache.maven.SessionScoped;
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.project.MavenProject;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
 import org.codehaus.plexus.logging.Logger;
 import org.eclipse.tycho.ReactorProject;
+import org.eclipse.tycho.core.osgitools.DefaultReactorProject;
 import org.eclipse.tycho.core.shared.MavenContext;
 
 @Component(role = TargetDefinitionVariableResolver.class)
+@SessionScoped
 public class DefaultTargetDefinitionVariableResolver implements TargetDefinitionVariableResolver {
 
     private static final Pattern SYSTEM_PROPERTY_PATTERN = createVariablePatternArgument("system_property");
@@ -33,8 +41,11 @@ public class DefaultTargetDefinitionVariableResolver implements TargetDefinition
     private MavenContext mavenContext;
     @Requirement
     private Logger logger;
+    private MavenSession mavenSession;
 
-    public DefaultTargetDefinitionVariableResolver() {
+    @Inject
+    public DefaultTargetDefinitionVariableResolver(MavenSession mavenSession) {
+        this.mavenSession = mavenSession;
     }
 
     /** for tests */
@@ -59,21 +70,22 @@ private String findProjectLocation(String projectName) {
             projectName = projectName.substring(1);
         }
         logger.debug("Find project location for project " + projectName);
-        for (ReactorProject project : projects()) {
+        Iterable<ReactorProject> projects = projects();
+        for (ReactorProject project : projects) {
             String name = project.getName();
             logger.debug("check reactor project name: " + name);
             if (name.equals(projectName)) {
                 return project.getBasedir().getAbsolutePath();
             }
         }
-        for (ReactorProject project : projects()) {
+        for (ReactorProject project : projects) {
             String artifactId = project.getArtifactId();
             logger.debug("check reactor project artifact id: " + artifactId);
             if (artifactId.equals(projectName)) {
                 return project.getBasedir().getAbsolutePath();
             }
         }
-        for (ReactorProject project : projects()) {
+        for (ReactorProject project : projects) {
             String name = project.getBasedir().getName();
             logger.debug("check reactor project base directory: " + name);
             if (name.equals(projectName)) {
@@ -91,6 +103,12 @@ private String property(String key, String defaultValue) {
     }
 
     private Iterable<ReactorProject> projects() {
+        if (mavenSession != null) {
+            List<MavenProject> projects = mavenSession.getAllProjects();
+            if (projects != null) {
+                return projects.stream().map(DefaultReactorProject::adapt).toList();
+            }
+        }
         return mavenContext.getProjects();
     }