rhg: Sub-repositories are not supported

Differential Revision: https://phab.mercurial-scm.org/D11940

rust/hg-core/src/repo.rs

@@ -417,6 +417,14 b' impl Repo {'
         )
     }
 
+    pub fn has_subrepos(&self) -> Result<bool, DirstateError> {
+        if let Some(entry) = self.dirstate_map()?.get(HgPath::new(".hgsub"))? {
+            Ok(entry.state().is_tracked())
+        } else {
+            Ok(false)
+        }
+    }
+
     pub fn filelog(&self, path: &HgPath) -> Result<Filelog, HgError> {
         Filelog::open(self, path)
     }

rust/rhg/src/main.rs

@@ -29,7 +29,7 b' fn main_with_result('
     repo: Result<&Repo, &NoRepoInCwdError>,
     config: &Config,
 ) -> Result<(), CommandError> {
-    check_unsupported(config, ui)?;
+    check_unsupported(config, repo, ui)?;
 
     let app = App::new("rhg")
         .global_setting(AppSettings::AllowInvalidUtf8)
@@ -643,6 +643,7 b' fn check_extensions(config: &Config) -> '
 
 fn check_unsupported(
     config: &Config,
+    repo: Result<&Repo, &NoRepoInCwdError>,
     ui: &ui::Ui,
 ) -> Result<(), CommandError> {
     check_extensions(config)?;
@@ -653,6 +654,12 b' fn check_unsupported('
         Err(CommandError::unsupported("$HG_PENDING"))?
     }
 
+    if let Ok(repo) = repo {
+        if repo.has_subrepos()? {
+            Err(CommandError::unsupported("sub-repositories"))?
+        }
+    }
+
     if config.has_non_empty_section(b"encode") {
         Err(CommandError::unsupported("[encode] config"))?
     }

tests/test-subrepo-deep-nested-change.t

@@ -1,7 +1,3 b''
-TODO: fix rhg bugs that make this test fail when status is enabled
-  $ unset RHG_STATUS
-
-
   $ cat >> $HGRCPATH <<EOF
   > [extdiff]
   > # for portability:

tests/test-subrepo-missing.t

@@ -1,7 +1,3 b''
-TODO: fix rhg bugs that make this test fail when status is enabled
-  $ unset RHG_STATUS
-
-
   $ hg init repo
   $ cd repo
   $ hg init subrepo