rustpkg: Don't assume a non-numeric refspec is a tag

Just pass it directly to git, without prefixing it with tags/

Author: catamorphism

src/librustpkg/source_control.rs

@@ -10,7 +10,8 @@
 
 // Utils for working with version control repositories. Just git right now.
 
-use std::{io, os, run, str};
+use std::{os, run, str};
+use std::run::{ProcessOutput, ProcessOptions, Process};
 use version::*;
 
 /// For a local git repo
@@ -47,7 +48,7 @@ pub fn git_clone_general(source: &str, target: &Path, v: &Version) -> bool {
     else {
         match v {
             &ExactRevision(ref s) | &Tagged(ref s) => {
-                    let outp = run::process_output_in_cwd("git", [~"checkout", fmt!("tags/%s", *s)],
+                    let outp = process_output_in_cwd("git", [~"checkout", fmt!("%s", *s)],
                                                          target);
                     if outp.status != 0 {
                         debug!(str::from_bytes_owned(outp.output.clone()));
@@ -63,6 +64,12 @@ pub fn git_clone_general(source: &str, target: &Path, v: &Version) -> bool {
         }
 }
 
+fn process_output_in_cwd(prog: &str, args: &[~str], cwd: &Path) -> ProcessOutput {
+    let mut prog = Process::new(prog, args, ProcessOptions{ dir: Some(cwd)
+                                ,..ProcessOptions::new()});
+    prog.finish_with_output()
+}
+
 pub fn is_git_dir(p: &Path) -> bool {
     os::path_is_dir(&p.push(".git"))
 }

src/librustpkg/tests.rs

@@ -1029,6 +1029,6 @@ fn test_non_numeric_tag() {
                                 "test_pkg", "testbranch_only"]);
     let file2 = repo.push_many(["mockgithub.com", "catamorphism", "test_pkg",
                                 "master_only"]);
-    assert!(os::path_exists(&file1));'
+    assert!(os::path_exists(&file1));
     assert!(!os::path_exists(&file2));
 }