Add function to read files from repository

benchmark-new/benchmark_repository/examples/test.rs

@@ -3,6 +3,7 @@ extern crate pretty_env_logger;
 
 use benchmark_repository::{BenchmarkRepository, TargetPath};
 
+use std::io::{self, copy};
 use std::path::Path;
 
 fn main()
@@ -11,11 +12,15 @@ fn main()
 
 	let benchmark_repository = BenchmarkRepository::new("git@git.luehne.de:patrick/tplp-planning-benchmark.git", Path::new("storage"), "git", "Potassco Bot", "bot@potassco.org");
 
-	let files = vec!
+	/*let files = vec!
 		[
 			TargetPath{source: &Path::new("/tmp/test"), destination: &Path::new("foobar/test")},
 			TargetPath{source: &Path::new("/tmp/test2"), destination: &Path::new("foobar/test-2")},
 		];
 
-	benchmark_repository.commit_files(&files[..], "test-results");
+	benchmark_repository.commit_files(&files[..], "test-results");*/
+
+	let mut file = benchmark_repository.read_file(Path::new("configurations.yml"), "test-config").unwrap();
+
+	copy(&mut file, &mut io::stdout());
 }

benchmark-new/benchmark_repository/src/lib.rs

@@ -7,6 +7,7 @@ extern crate indicatif;
 use git2::{Cred, Error, FetchOptions, Index, IndexEntry, IndexTime, Progress, PushOptions, RemoteCallbacks, ResetType, Repository, Signature, TreeBuilder};
 use git2::build::{CheckoutBuilder, RepoBuilder};
 use std::fs::read;
+use std::io::Cursor;
 use std::path::Path;
 use std::string::String;
 use std::str;
@@ -326,6 +327,36 @@ impl BenchmarkRepository
 		let mut remote = self.repository.find_remote("origin").expect("");
 		remote.push(&[&push_refspec], Some(&mut push_options)).expect("couldn’t push");
 	}
+
+	pub fn read_file(&self, file_path: &Path, branch_name: &str) -> Option<Cursor<Vec<u8>>>
+	{
+		let tip_reference_name = format!("refs/remotes/origin/{}", branch_name);
+		let tip_reference = match self.repository.find_reference(&tip_reference_name)
+		{
+			Ok(value) => value,
+			Err(error) => panic!("Could not find reference “{}”: {}", tip_reference_name, error),
+		};
+
+		let tree = match tip_reference.peel_to_tree()
+		{
+			Ok(value) => value,
+			Err(error) => panic!("Could not peel reference to tree: {}", error),
+		};
+
+		let object_id = match tree.get_path(file_path)
+		{
+			Ok(tree_entry) => tree_entry.id(),
+			Err(error) => return None,
+		};
+
+		let blob = match self.repository.find_blob(object_id)
+		{
+			Ok(blob) => blob,
+			Err(error) => return None,
+		};
+
+		Some(Cursor::new(blob.content().to_owned()))
+	}
 }
 
 #[cfg(test)]