Auto merge of rust-lang#8778 - ehuss:update-git2, r=alexcrichton

Update git2.

Closes rust-lang#8517
Closes rust-lang#8588
Closes rust-lang#8352
Closes rust-lang#4777
Closes rust-lang#8746

I only added a test for one of these. I can add for the others if you want.

Cargo.toml

@@ -32,7 +32,7 @@ pretty_env_logger = { version = "0.4", optional = true }
 anyhow = "1.0"
 filetime = "0.2.9"
 flate2 = { version = "1.0.3", default-features = false, features = ["zlib"] }
-git2 = "0.13.5"
+git2 = "0.13.12"
 git2-curl = "0.14.0"
 glob = "0.3.0"
 hex = "0.4"
@@ -44,7 +44,7 @@ jobserver = "0.1.21"
 lazycell = "1.2.0"
 libc = "0.2"
 log = "0.4.6"
-libgit2-sys = "0.12.7"
+libgit2-sys = "0.12.14"
 memchr = "2.1.3"
 num_cpus = "1.0"
 opener = "0.4"

tests/testsuite/new.rs

@@ -602,3 +602,26 @@ If you need a crate name to not match the directory name, consider using --name
         )
         .run();
 }
+
+#[cargo_test]
+fn git_default_branch() {
+    // Check for init.defaultBranch support.
+    create_empty_gitconfig();
+    cargo_process("new foo").env("USER", "foo").run();
+    let repo = git2::Repository::open(paths::root().join("foo")).unwrap();
+    let head = repo.find_reference("HEAD").unwrap();
+    assert_eq!(head.symbolic_target().unwrap(), "refs/heads/master");
+
+    fs::write(
+        paths::home().join(".gitconfig"),
+        r#"
+        [init]
+            defaultBranch = hello
+        "#,
+    )
+    .unwrap();
+    cargo_process("new bar").env("USER", "foo").run();
+    let repo = git2::Repository::open(paths::root().join("bar")).unwrap();
+    let head = repo.find_reference("HEAD").unwrap();
+    assert_eq!(head.symbolic_target().unwrap(), "refs/heads/hello");
+}