Add support for Mercurial subrepositories

its/src/test/java/com/sonarsource/it/scm/MercurialTest.java

@@ -75,6 +75,27 @@ public void testBlame() throws Exception {
         MapEntry.entry(3, new LineData("f553ba9f524c", "2012-07-18T18:26:11+0200", "david@gageot.net")));
   }
 
+  @Test
+  public void testBlameSubrepo() throws Exception {
+    File projectDir = temp.newFolder();
+    ZipUtils.unzip(new File("scm-repo/dummy-hg-with-subrepo.zip"), projectDir);
+    File fileInRepo = new File(projectDir, "dummy-hg-with-subrepo/fileinrepo.txt");
+    File fileInSubRepo = new File(projectDir, "dummy-hg-with-subrepo/subrepo/fileinsubrepo.txt");
+    MavenBuild sonar = MavenBuild.create(fileInRepo)
+      .setGoals("verify sonar:sonar")
+      .setProperty("sonar.scm.disabled", "false");
+    orchestrator.executeBuilds(sonar);
+    assertThat(getScmData("dummy-hg-with-subrepo:dummy:fileinrepo.txt"))
+      .contains(
+        MapEntry.entry(0, new LineData("6db77db9dbc4", "2021-10-02 13:45:42+0200", "koenpoppe")),
+        MapEntry.entry(2, new LineData("1c43854ced78", "2021-10-02 13:46:33+0200", "koenpoppe")));
+    assertThat(getScmData("dummy-hg-with-subrepo:dummy:subrepo/fileinsubrepo.txt"))
+      .contains(
+        MapEntry.entry(0, new LineData("ba3299cdfa0e", "2021-10-02 13:40:29+0200", "koenpoppe")),
+        MapEntry.entry(1, new LineData("73172c209d54", "2021-10-02 13:40:42+0200", "koenpoppe")),
+        MapEntry.entry(2, new LineData("f5825590563b", "2021-10-02 13:41:07+0200", "koenpoppe")));
+  }
+
   private static final SimpleDateFormat DATETIME_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
 
   private class LineData {

sonar-scm-mercurial-plugin/src/main/java/org/sonar/plugins/scm/mercurial/MercurialBlameCommand.java

@@ -20,6 +20,7 @@
 package org.sonar.plugins.scm.mercurial;
 
 import java.io.File;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.Callable;
@@ -112,8 +113,21 @@ private int execute(Command cl, StreamConsumer consumer, StreamConsumer stderr)
   }
 
   private Command createCommandLine(File workingDirectory, String filename) {
+    // Determine root repo, i.e., where the .hg directory is
+    Path workingPath = workingDirectory.toPath();
+    Path filePath = new File(workingDirectory, filename).toPath();
+    Path repoRootPath = filePath.getParent();
+    while (!repoRootPath.equals(workingPath)) {
+      File hgDir = new File(repoRootPath.toFile(), ".hg");
+      if (hgDir.exists()) {
+        break;
+      }
+      repoRootPath = repoRootPath.getParent();
+    }
+    String filePathInRepo = repoRootPath.relativize(filePath).toString();
+
     Command cl = Command.create("hg");
-    cl.setDirectory(workingDirectory);
+    cl.setDirectory(repoRootPath.toFile());
     cl.addArgument("blame");
     // Hack to support Mercurial prior to 2.1
     if (!settings.getBoolean("sonar.mercurial.considerWhitespaces")) {
@@ -131,7 +145,7 @@ private Command createCommandLine(File workingDirectory, String filename) {
     // Make filename safe for usage with the "hg" command
     // See Guideline 10 at https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html
     cl.addArgument("--");
-    cl.addArgument(filename);
+    cl.addArgument(filePathInRepo);
     return cl;
   }
 

sonar-scm-mercurial-plugin/src/test/java/org/sonar/plugins/scm/mercurial/MercurialBlameCommandTest.java

@@ -189,6 +189,7 @@ public void shouldProcessMaliciousFileBlockingAttack() throws IOException {
     new MercurialBlameCommand(commandExecutor, new MapSettings())
       .blame(input, result);
 
+    assertThat(commandCaptor.getValue().getDirectory()).isEqualTo(baseDir);
     assertThat(commandCaptor.getValue().getArguments())
       .containsExactly("blame", "-w", "-v", "--user", "--date", "--changeset", "--", MALICIOUS_FILENAME);
 
@@ -199,4 +200,80 @@ public void shouldProcessMaliciousFileBlockingAttack() throws IOException {
         .author("john.something@sonarsource.com")));
   }
 
+  @Test
+  public void takeHgDirFromSubrepository() throws IOException {
+    // In main repository
+    {
+      File mainrepoSource = new File(baseDir, "src/mainrepoSource.xoo");
+      FileUtils.write(mainrepoSource, "sample content");
+      InputFile inputFile = new TestInputFileBuilder("mainrepoSource", "src/mainrepoSource.xoo")
+          .setModuleBaseDir(baseDir.toPath())
+          .build();
+      fs.add(inputFile);
+
+      BlameOutput result = mock(BlameOutput.class);
+      CommandExecutor commandExecutor = mock(CommandExecutor.class);
+
+      ArgumentCaptor<Command> commandCaptor = ArgumentCaptor.forClass(Command.class);
+      when(commandExecutor.execute(commandCaptor.capture(), any(), any(), anyLong())).thenAnswer((Answer<Integer>) invocation -> {
+        StreamConsumer outConsumer = (StreamConsumer) invocation.getArguments()[1];
+        outConsumer.consumeLine("John Something <john.something@sonarsource.com> 447af27e2bc1 Tue Nov 04 11:01:10 2020 +0100: foo");
+        return 0;
+      });
+
+      when(input.filesToBlame()).thenReturn(singletonList(inputFile));
+      new MercurialBlameCommand(commandExecutor, new MapSettings())
+        .blame(input, result);
+
+      assertThat(commandCaptor.getValue().getDirectory()).isEqualTo(baseDir);
+      assertThat(commandCaptor.getValue().getArguments())
+        .containsExactly("blame", "-w", "-v", "--user", "--date", "--changeset", "--", "src/mainrepoSource.xoo");
+
+      verify(result).blameResult(inputFile,
+        singletonList(new BlameLine()
+          .date(DateUtils.parseDateTime("2020-11-04T11:01:10+0100"))
+          .revision("447af27e2bc1")
+          .author("john.something@sonarsource.com")));
+    }
+
+    // In sub repository
+    {
+      File subrepoDir = new File(baseDir, "subrepo");
+      assertThat(subrepoDir.mkdir()).isTrue();
+      File subrepoHgDir = new File(subrepoDir, ".hg");
+      assertThat(subrepoHgDir.mkdir()).isTrue();
+      File subrepoSource = new File(subrepoDir, "src/subrepoSource.xoo");
+      FileUtils.write(subrepoSource, "sample content");
+      InputFile inputFile = new TestInputFileBuilder("bar", "subrepo/src/subrepoSource.xoo")
+          .setModuleBaseDir(baseDir.toPath())
+          .build();
+      fs.add(inputFile);
+
+      BlameOutput result = mock(BlameOutput.class);
+      CommandExecutor commandExecutor = mock(CommandExecutor.class);
+
+      ArgumentCaptor<Command> commandCaptor = ArgumentCaptor.forClass(Command.class);
+      when(commandExecutor.execute(commandCaptor.capture(), any(), any(), anyLong())).thenAnswer((Answer<Integer>) invocation -> {
+        StreamConsumer outConsumer = (StreamConsumer) invocation.getArguments()[1];
+        outConsumer.consumeLine("John Something <john.something@sonarsource.com> 447af27e2bc1 Tue Nov 04 11:01:10 2020 +0100: foo");
+        return 0;
+      });
+
+      when(input.filesToBlame()).thenReturn(singletonList(inputFile));
+
+      new MercurialBlameCommand(commandExecutor, new MapSettings())
+        .blame(input, result);
+
+      assertThat(commandCaptor.getValue().getDirectory()).isEqualTo(subrepoDir);
+      assertThat(commandCaptor.getValue().getArguments())
+        .containsExactly("blame", "-w", "-v", "--user", "--date", "--changeset", "--", "src/subrepoSource.xoo");
+
+      verify(result).blameResult(inputFile,
+        singletonList(new BlameLine()
+          .date(DateUtils.parseDateTime("2020-11-04T11:01:10+0100"))
+          .revision("447af27e2bc1")
+          .author("john.something@sonarsource.com")));
+    }
+  }
+
 }