feat(context-provider): add support for indexing multiple branches

crates/llama-cpp-server/src/lib.rs

@@ -107,7 +107,11 @@ impl CompletionServer {
 
 #[async_trait]
 impl CompletionStream for CompletionServer {
-    async fn generate(&self, prompt: &str, options: CompletionOptions) -> BoxStream<'life0, String> {
+    async fn generate(
+        &self,
+        prompt: &str,
+        options: CompletionOptions,
+    ) -> BoxStream<'life0, String> {
         self.completion.generate(prompt, options).await
     }
 }

crates/tabby-common/src/axum.rs

@@ -47,7 +47,11 @@ impl AllowedCodeRepository {
                     .into_iter()
                     .enumerate()
                     .map(|(i, repo)| {
-                        CodeRepository::new(repo.git_url(), &crate::config::config_index_to_id(i))
+                        CodeRepository::new(
+                            repo.git_url(),
+                            &crate::config::config_index_to_id(i),
+                            repo.git_refs(),
+                        )
                     })
                     .collect()
             })
@@ -85,7 +89,9 @@ mod tests {
             let candidates: Vec<_> = $candidates
                 .into_iter()
                 .enumerate()
-                .map(|(i, x)| CodeRepository::new(&x, &crate::config::config_index_to_id(i)))
+                .map(|(i, x)| {
+                    CodeRepository::new(&x, &crate::config::config_index_to_id(i), vec![])
+                })
                 .collect();
             let expect = &candidates[0];
             assert_eq!(
@@ -100,7 +106,9 @@ mod tests {
             let candidates: Vec<_> = $candidates
                 .into_iter()
                 .enumerate()
-                .map(|(i, x)| CodeRepository::new(&x, &crate::config::config_index_to_id(i)))
+                .map(|(i, x)| {
+                    CodeRepository::new(&x, &crate::config::config_index_to_id(i), vec![])
+                })
                 .collect();
             assert_eq!(closest_match($query, &candidates), None);
         };

crates/tabby-common/src/config.rs

@@ -156,13 +156,19 @@ pub fn config_id_to_index(id: &str) -> Result<usize, anyhow::Error> {
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
 pub struct RepositoryConfig {
     git_url: String,
+    #[serde(default)]
+    pub refs: Vec<String>,
 }
 
 impl RepositoryConfig {
     pub fn git_url(&self) -> &str {
         &self.git_url
     }
 
+    pub fn git_refs(&self) -> Vec<String> {
+        self.refs.clone()
+    }
+
     pub fn canonicalize_url(url: &str) -> String {
         let url = url.strip_suffix(".git").unwrap_or(url);
         url::Url::parse(url)
@@ -472,13 +478,15 @@ impl AnswerConfig {
 pub struct CodeRepository {
     pub git_url: String,
     pub source_id: String,
+    pub git_refs: Vec<String>,
 }
 
 impl CodeRepository {
-    pub fn new(git_url: &str, source_id: &str) -> Self {
+    pub fn new(git_url: &str, source_id: &str, git_refs: Vec<String>) -> Self {
         Self {
             git_url: git_url.to_owned(),
             source_id: source_id.to_owned(),
+            git_refs,
         }
     }
 
@@ -643,6 +651,7 @@ mod tests {
     fn it_parses_local_dir() {
         let repo = RepositoryConfig {
             git_url: "file:///home/user".to_owned(),
+            refs: vec![],
         };
         let _ = repo.dir();
     }
@@ -651,6 +660,7 @@ mod tests {
     fn test_repository_config_name() {
         let repo = RepositoryConfig {
             git_url: "https://github.com/TabbyML/tabby.git".to_owned(),
+            refs: vec![],
         };
         assert!(repo.dir().ends_with("https_github.com_TabbyML_tabby"));
     }

crates/tabby-git/src/lib.rs

@@ -3,8 +3,9 @@ mod file_search;
 mod grep;
 mod serve_git;
 
-use std::path::Path;
+use std::{fs, path::Path, process::Command};
 
+use anyhow::bail;
 use axum::{
     body::Body,
     http::{Response, StatusCode},
@@ -13,6 +14,7 @@ pub use commit::{stream_commits, Commit};
 use file_search::GitFileSearch;
 use futures::Stream;
 pub use grep::{GrepFile, GrepLine, GrepSubMatch, GrepTextOrBase64};
+use tracing::warn;
 
 pub async fn search_files(
     root: &Path,
@@ -56,6 +58,7 @@ pub fn serve_file(
     serve_git::serve(&repository, commit, path)
 }
 
+#[derive(Debug)]
 pub struct GitReference {
     pub name: String,
     pub commit: String,
@@ -76,6 +79,78 @@ pub fn list_refs(root: &Path) -> anyhow::Result<Vec<GitReference>> {
         .collect())
 }
 
+pub fn get_head_name(root: &Path) -> anyhow::Result<String> {
+    let repository = git2::Repository::open(root)?;
+    let head = repository.head()?;
+    let name = head.name().ok_or(anyhow::anyhow!("HEAD has no name"))?;
+    Ok(name.to_string())
+}
+
+pub fn sync_refs(root: &Path, url: &str, refs: &Vec<String>) -> anyhow::Result<()> {
+    if !root.exists() {
+        fs::create_dir_all(root)?;
+        let status = Command::new("git")
+            .current_dir(root.parent().expect("Must not be in root directory"))
+            .arg("clone")
+            .arg(url)
+            .arg(root)
+            .status()?;
+
+        if let Some(code) = status.code() {
+            if code != 0 {
+                warn!(
+                    "Failed to clone `{}`. Please check your repository configuration.",
+                    url
+                );
+                fs::remove_dir_all(root).expect("Failed to remove directory");
+
+                bail!("Failed to clone `{}`", url);
+            }
+        }
+    }
+
+    for ref_name in refs {
+        let branch = ref_name.rsplit('/').next().unwrap_or(ref_name);
+        // get the current branch name without refs/ prefix
+        let output = Command::new("git")
+            .current_dir(root)
+            .arg("symbolic-ref")
+            .arg("--short")
+            .arg("HEAD")
+            .output()
+            .ok();
+
+        let current_branch = output
+            .filter(|o| o.status.success())
+            .and_then(|o| String::from_utf8(o.stdout).ok())
+            .map(|s| s.trim().to_string());
+
+        let status = if current_branch.as_deref() == Some(branch) {
+            Command::new("git")
+                .current_dir(root)
+                .arg("pull")
+                .arg("origin")
+                .arg(branch)
+                .status()?
+        } else {
+            // Use `git fetch origin +ref:ref` to create or update the local branch from the remote.
+            // The + ensures that the local branch is updated (forced) even if it's not a fast-forward,
+            //   and it creates the branch if it doesn't exist locally.
+            Command::new("git")
+                .current_dir(root)
+                .arg("fetch")
+                .arg("origin")
+                .arg(format!("+{branch}:{branch}"))
+                .status()?
+        };
+        if !status.success() {
+            return Err(anyhow::anyhow!("Failed to fetch origin {}", branch));
+        }
+    }
+
+    Ok(())
+}
+
 fn rev_to_commit<'a>(
     repository: &'a git2::Repository,
     rev: Option<&str>,

crates/tabby-index/Cargo.toml

@@ -8,6 +8,7 @@ homepage.workspace = true
 [dependencies]
 anyhow = { workspace = true }
 tabby-common = { path = "../tabby-common" }
+tabby-git ={ path = "../tabby-git" }
 tantivy = { workspace = true }
 tracing = { workspace = true }
 tree-sitter-tags = "0.22.6"

crates/tabby-index/src/code/index.rs

@@ -11,9 +11,12 @@ use tracing::warn;
 use super::{
     create_code_builder,
     intelligence::{CodeIntelligence, SourceCode},
-    CodeRepository,
+    repository, CodeRepository,
+};
+use crate::{
+    code::repository::resolve_commits,
+    indexer::{Indexer, TantivyDocBuilder},
 };
-use crate::indexer::{Indexer, TantivyDocBuilder};
 
 // Magic numbers
 static MAX_LINE_LENGTH_THRESHOLD: usize = 300;
@@ -22,13 +25,30 @@ static MIN_ALPHA_NUM_FRACTION: f32 = 0.25f32;
 static MAX_NUMBER_OF_LINES: usize = 100000;
 static MAX_NUMBER_FRACTION: f32 = 0.5f32;
 
-pub async fn index_repository(
-    embedding: Arc<dyn Embedding>,
-    repository: &CodeRepository,
-    commit: &str,
-) {
-    let total_files = Walk::new(repository.dir()).count();
-    let file_stream = stream! {
+pub async fn index_repository(embedding: Arc<dyn Embedding>, repository: &CodeRepository) {
+    let refs = resolve_commits(repository);
+    // resolve_commits would return the current default branch,
+    // so it should never be empty here.
+    if refs.is_empty() {
+        logkit::error!(
+            "no branches found for repository {}",
+            repository.canonical_git_url()
+        );
+        return;
+    }
+
+    let mut count_files = 0;
+    let mut count_chunks = 0;
+
+    for (ref_name, sha) in refs {
+        if let Err(e) = repository::checkout(repository, &ref_name) {
+            warn!("Failed to checkout ref {}: {}", ref_name, e);
+            continue;
+        }
+
+        logkit::info!("Indexing branch {} with commit {}", ref_name, &sha);
+
+        let file_stream = stream! {
         for file in Walk::new(repository.dir()) {
             let file = match file {
                 Ok(file) => file,
@@ -40,21 +60,22 @@ pub async fn index_repository(
 
             yield file;
         }
-    }
-    // Commit every 100 files
-    .chunks(100);
+        }
+        // Commit every 100 files
+        .chunks(100);
 
-    let mut file_stream = pin!(file_stream);
+        let mut file_stream = pin!(file_stream);
 
-    let mut count_files = 0;
-    let mut count_chunks = 0;
-    while let Some(files) = file_stream.next().await {
-        count_files += files.len();
-        count_chunks += add_changed_documents(repository, commit, embedding.clone(), files).await;
-        logkit::info!("Processed {count_files}/{total_files} files, updated {count_chunks} chunks",);
+        while let Some(files) = file_stream.next().await {
+            count_files += files.len();
+            count_chunks += add_changed_documents(repository, &sha, embedding.clone(), files).await;
+            logkit::info!("Processed {count_files} files, updated {count_chunks} chunks",);
+        }
     }
 }
 
+// garbage collection use blob id to check files,
+// does NOT have to checkout branch locally.
 pub async fn garbage_collection() {
     let index = Indexer::new(corpus::CODE);
     stream! {

crates/tabby-index/src/code/mod.rs

@@ -34,13 +34,13 @@ impl CodeIndexer {
         embedding: Arc<dyn Embedding>,
         repository: &CodeRepository,
     ) -> anyhow::Result<()> {
+        repository::sync_repository(repository)?;
+
         logkit::info!(
             "Building source code index: {}",
             repository.canonical_git_url()
         );
-        let commit = repository::sync_repository(repository)?;
-
-        index::index_repository(embedding, repository, &commit).await;
+        index::index_repository(embedding, repository).await;
         index::garbage_collection().await;
 
         Ok(())