Method exists

backend/src/git/client.rs:167–173

(&self, repo_id: RepoId, id: &ExternalId)

    }

    pub fn exists(&self, repo_id: RepoId, id: &ExternalId) -> Result<bool> {
        if !self.viewer.can_read(repo_id) {
            return Ok(false);
        }
        let repo = self.view(repo_id)?;
        repo.object_exists(id)
    }

    pub fn fetch(&self, repo_id: RepoId, id: &ExternalId) -> Option<RepoObject> {
        if !self.viewer.can_read(repo_id) {