message: Add debug info to git::two_deps_only_update_one test
diff: @@ -11,6 +11,7 @@ use std::thread;
  use support::paths::{self, CargoPathExt};
  use support::sleep_ms;
  use support::{basic_lib_manifest, basic_manifest, git, main_file, path2url, project};
  +use support::Project;
  #[test]
  fn cargo_compile_simple_git_dep() {
  @@ -1090,6 +1091,18 @@ fn two_deps_only_update_one() {
  ).file("src/main.rs", "fn main() {}")
  .build();
  + fn oid_to_short_sha(oid: git2::Oid) -> String {
  + oid.to_string()[..8].to_string()
  + }
  + fn git_repo_head_sha(p: &Project) -> String {
  + let repo = git2::Repository::open(p.root()).unwrap();
  + let head = repo.head().unwrap().target().unwrap();
  + oid_to_short_sha(head)
  + }
  +
  + println!("dep1 head sha: {}", git_repo_head_sha(&git1));
  + println!("dep2 head sha: {}", git_repo_head_sha(&git2));
  +
  p.cargo("build")
  .with_stderr(
  "[UPDATING] git repository `[..]`\n\
  @@ -1106,7 +1119,8 @@ fn two_deps_only_update_one() {
  .unwrap();
  let repo = git2::Repository::open(&git1.root()).unwrap();
  git::add(&repo);
  - git::commit(&repo);
  + let oid = git::commit(&repo);
  + println!("dep1 head sha: {}", oid_to_short_sha(oid));
  p.cargo("update -p dep1")
  .with_stderr(&format!(
  