git: remove handling of real remote named "git", always override

jj-vcs#1690

cli/src/commands/branch.rs

@@ -322,19 +322,7 @@ fn cmd_branch_list(
 ) -> Result<(), CommandError> {
     let workspace_command = command.workspace_helper(ui)?;
     let repo = workspace_command.repo();
-    let (mut all_branches, bad_branch_names) = git::build_unified_branches_map(repo.view());
-    if !bad_branch_names.is_empty() {
-        // TODO: This is not currently tested
-        writeln!(
-            ui.warning(),
-            "WARNING: Branch {branch_name} has a remote-tracking branch for a remote named `git`. \
-             Local-git tracking branches for it will not be shown.\nIt is recommended to rename \
-             that remote, as jj normally reserves the `@git` suffix to denote local-git tracking \
-             branches.",
-            branch_name = bad_branch_names.join(", "),
-        )?;
-    }
-
+    let mut all_branches = git::build_unified_branches_map(repo.view());
     if !args.revisions.is_empty() {
         // Match against local targets only, which is consistent with "jj git push".
         fn local_targets(branch_target: &BranchTarget) -> impl Iterator<Item = &CommitId> {

cli/src/commit_templater.rs

@@ -355,7 +355,7 @@ impl RefNamesIndex {
 
 fn build_branches_index(repo: &dyn Repo) -> RefNamesIndex {
     let mut index = RefNamesIndex::default();
-    let (all_branches, _) = git::build_unified_branches_map(repo.view());
+    let all_branches = git::build_unified_branches_map(repo.view());
     for (branch_name, branch_target) in &all_branches {
         let local_target = &branch_target.local_target;
         let mut unsynced_remote_targets = branch_target

lib/src/git.rs

@@ -145,30 +145,18 @@ fn resolve_git_ref_to_commit_id(
 }
 
 /// Builds a map of branches which also includes pseudo `@git` remote.
-///
-/// If there's an existing remote named `git`, a list of conflicting branch
-/// names will be returned.
-pub fn build_unified_branches_map(view: &View) -> (BTreeMap<String, BranchTarget>, Vec<String>) {
+pub fn build_unified_branches_map(view: &View) -> BTreeMap<String, BranchTarget> {
     let mut all_branches = view.branches().clone();
-    let mut bad_branch_names = Vec::new();
     for (branch_name, git_tracking_target) in local_branch_git_tracking_refs(view) {
+        // There may be a "git" remote if the view has been stored by older jj versions,
+        // but we override it anyway.
         let branch_target = all_branches.entry(branch_name.to_owned()).or_default();
-        if branch_target
-            .remote_targets
-            .contains_key(REMOTE_NAME_FOR_LOCAL_GIT_REPO)
-        {
-            // TODO(#1690): There should be a mechanism to prevent importing a
-            // remote named "git" in `jj git import`.
-            bad_branch_names.push(branch_name.to_owned());
-        } else {
-            // TODO: `BTreeMap::try_insert` could be used here once that's stabilized.
-            branch_target.remote_targets.insert(
-                REMOTE_NAME_FOR_LOCAL_GIT_REPO.to_owned(),
-                git_tracking_target.clone(),
-            );
-        }
+        branch_target.remote_targets.insert(
+            REMOTE_NAME_FOR_LOCAL_GIT_REPO.to_owned(),
+            git_tracking_target.clone(),
+        );
     }
-    (all_branches, bad_branch_names)
+    all_branches
 }
 
 fn local_branch_git_tracking_refs(view: &View) -> impl Iterator<Item = (&str, &RefTarget)> {

lib/src/revset.rs

@@ -1885,26 +1885,19 @@ fn resolve_local_branch(repo: &dyn Repo, symbol: &str) -> Option<Vec<CommitId>>
 
 fn resolve_remote_branch(repo: &dyn Repo, name: &str, remote: &str) -> Option<Vec<CommitId>> {
     let view = repo.view();
-    let target = view.get_remote_branch(name, remote);
-    if target.is_present() {
-        return Some(target.added_ids().cloned().collect());
-    }
-    // A remote with name "git" will shadow local-git tracking branches
-    if remote == git::REMOTE_NAME_FOR_LOCAL_GIT_REPO {
-        let target = match name {
-            "HEAD" => view.git_head(),
-            _ => get_local_git_tracking_branch(view, name),
-        };
-        if target.is_present() {
-            return Some(target.added_ids().cloned().collect());
-        }
-    }
-    None
+    let target = match (name, remote) {
+        ("HEAD", git::REMOTE_NAME_FOR_LOCAL_GIT_REPO) => view.git_head(),
+        (name, git::REMOTE_NAME_FOR_LOCAL_GIT_REPO) => get_local_git_tracking_branch(view, name),
+        (name, remote) => view.get_remote_branch(name, remote),
+    };
+    target
+        .is_present()
+        .then(|| target.added_ids().cloned().collect())
 }
 
 fn collect_branch_symbols(repo: &dyn Repo, include_synced_remotes: bool) -> Vec<String> {
     let view = repo.view();
-    let (all_branches, _) = git::build_unified_branches_map(view);
+    let all_branches = git::build_unified_branches_map(view);
     all_branches
         .iter()
         .flat_map(|(name, branch_target)| {