Add branch specifier to git config

examples/rust-git/Check.toml

@@ -1,6 +1,7 @@
 [project]
 kind = "git"
 repository = "https://gitlab.com/famedly/conduit"
+branch = "rocksdb"
 recent = 3
 language = "rust"
 config = "Cargo.toml"

src/config.rs

@@ -37,6 +37,7 @@ pub(crate) enum ProjectConfig {
     #[serde(rename = "git")]
     Git {
         repository: String,
+        branch: String,
         recent: i64,
 
         #[serde(flatten)]

src/git.rs

@@ -24,6 +24,7 @@ impl<'a> Drop for RemoveOnDrop<'a> {
 
 #[derive(Debug)]
 enum GitError {
+    Branch,
     Clone,
     Date,
 }
@@ -31,6 +32,7 @@ enum GitError {
 impl std::fmt::Display for GitError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
+            Self::Branch => write!(f, "Failed to checkout branch"),
             Self::Clone => write!(f, "Failed to clone repository"),
             Self::Date => write!(f, "Failed to fetch date from repository"),
         }
@@ -42,6 +44,7 @@ impl std::error::Error for GitError {}
 #[tracing::instrument]
 pub(crate) async fn check_git_project(
     repository: String,
+    branch: String,
     recent: i64,
     language: LanguageConfig,
 ) -> color_eyre::eyre::Result<BuildDirective> {
@@ -57,9 +60,19 @@ pub(crate) async fn check_git_project(
         return Err(GitError::Clone.into());
     }
 
-    let git_dir = format!("--git-dir={}/.git", CHECK_REPO);
     let output = tokio::process::Command::new("git")
-        .args([&git_dir, "show", "-s", "--format=%ci", "HEAD"])
+        .args(["checkout", &branch])
+        .current_dir(CHECK_REPO)
+        .output()
+        .await?;
+
+    if !output.status.success() {
+        return Err(GitError::Branch.into());
+    }
+
+    let output = tokio::process::Command::new("git")
+        .args(["show", "-s", "--format=%ci", "HEAD"])
+        .current_dir(CHECK_REPO)
         .output()
         .await?;
 

src/main.rs

@@ -31,8 +31,9 @@ async fn check_project(
         ProjectConfig::Git {
             repository,
             recent,
+            branch,
             language,
-        } => check_git_project(repository, recent, language).await,
+        } => check_git_project(repository, branch, recent, language).await,
         ProjectConfig::Alpine {
             package,
             branch,