diff --git a/src/librustpkg/api.rs b/src/librustpkg/api.rs
index 5233b87f7e4..17cb3521eb7 100644
--- a/src/librustpkg/api.rs
+++ b/src/librustpkg/api.rs
@@ -28,8 +28,8 @@ pub fn build_lib(sysroot: @Path, root: Path, dest: Path, name: ~str, version: Ve
 
     let pkg_src = PkgSrc {
         root: root,
-        dst_dir: dest,
-        id: PkgId{ version: version, ..PkgId::new(name)},
+        dst_dir: dest.clone(),
+        id: PkgId{ version: version, ..PkgId::new(name, &dest.pop())},
         libs: ~[mk_crate(lib)],
         mains: ~[],
         tests: ~[],
@@ -42,8 +42,8 @@ pub fn build_exe(sysroot: @Path, root: Path, dest: Path, name: ~str, version: Ve
                  main: Path) {
     let pkg_src = PkgSrc {
         root: root,
-        dst_dir: dest,
-        id: PkgId{ version: version, ..PkgId::new(name)},
+        dst_dir: dest.clone(),
+        id: PkgId{ version: version, ..PkgId::new(name, &dest.pop())},
         libs: ~[],
         mains: ~[mk_crate(main)],
         tests: ~[],
@@ -62,7 +62,7 @@ pub fn install_lib(sysroot: @Path,
     debug!("sysroot = %s", sysroot.to_str());
     debug!("workspace = %s", workspace.to_str());
     // make a PkgSrc
-    let pkg_id = PkgId{ version: version, ..PkgId::new(name)};
+    let pkg_id = PkgId{ version: version, ..PkgId::new(name, &workspace)};
     let build_dir = workspace.push("build");
     let dst_dir = build_dir.push_rel(&*pkg_id.local_path);
     let pkg_src = PkgSrc {
@@ -81,7 +81,7 @@ pub fn install_lib(sysroot: @Path,
 
 pub fn install_exe(sysroot: @Path, workspace: Path, name: ~str, version: Version) {
     default_ctxt(sysroot).install(&workspace, &PkgId{ version: version,
-                                            ..PkgId::new(name)});
+                                            ..PkgId::new(name, &workspace)});
 
 }
 
diff --git a/src/librustpkg/installed_packages.rs b/src/librustpkg/installed_packages.rs
index 980b00d3864..6b28b7ed6a1 100644
--- a/src/librustpkg/installed_packages.rs
+++ b/src/librustpkg/installed_packages.rs
@@ -18,11 +18,11 @@ pub fn list_installed_packages(f: &fn(&PkgId) -> bool) -> bool  {
     for workspaces.iter().advance |p| {
         let binfiles = os::list_dir(&p.push("bin"));
         for binfiles.iter().advance() |exec| {
-            f(&PkgId::new(*exec));
+            f(&PkgId::new(*exec, p));
         }
         let libfiles = os::list_dir(&p.push("lib"));
         for libfiles.iter().advance() |lib| {
-            f(&PkgId::new(*lib));
+            f(&PkgId::new(*lib, p));
         }
     }
     true
diff --git a/src/librustpkg/package_id.rs b/src/librustpkg/package_id.rs
index b11f9820960..d1000f7f845 100644
--- a/src/librustpkg/package_id.rs
+++ b/src/librustpkg/package_id.rs
@@ -9,7 +9,8 @@
 // except according to those terms.
 
 pub use package_path::{RemotePath, LocalPath, normalize, hash};
-use version::{try_getting_version, Version, NoVersion, split_version};
+use version::{try_getting_version, try_getting_local_version,
+              Version, NoVersion, split_version};
 
 /// Path-fragment identifier of a package such as
 /// 'github.com/graydon/test'; path must be a relative
@@ -40,7 +41,10 @@ impl Eq for PkgId {
 }
 
 impl PkgId {
-    pub fn new(s: &str) -> PkgId {
+    // The PkgId constructor takes a Path argument so as
+    // to be able to infer the version if the path refers
+    // to a local git repository
+    pub fn new(s: &str, work_dir: &Path) -> PkgId {
         use conditions::bad_pkg_id::cond;
 
         let mut given_version = None;
@@ -71,9 +75,12 @@ impl PkgId {
 
         let version = match given_version {
             Some(v) => v,
-            None => match try_getting_version(&remote_path) {
+            None => match try_getting_local_version(&work_dir.push_rel(&*local_path)) {
                 Some(v) => v,
-                None => NoVersion
+                None => match try_getting_version(&remote_path) {
+                    Some(v) => v,
+                    None => NoVersion
+                }
             }
         };
 
diff --git a/src/librustpkg/package_source.rs b/src/librustpkg/package_source.rs
index 54ad888e2ae..668157bebb9 100644
--- a/src/librustpkg/package_source.rs
+++ b/src/librustpkg/package_source.rs
@@ -15,6 +15,7 @@ use std::{os, run, str};
 use context::*;
 use crate::Crate;
 use messages::*;
+use source_control::git_clone;
 use path_util::pkgid_src_in_workspace;
 use util::compile_crate;
 use version::{ExactRevision, SemanticVersion, NoVersion};
@@ -76,9 +77,10 @@ impl PkgSrc {
         dir
     }
 
-    /// Try interpreting self's package id as a remote package, and try
+    /// Try interpreting self's package id as a git repository, and try
     /// fetching it and caching it in a local directory. Return the cached directory
-    /// if this was successful, None otherwise
+    /// if this was successful, None otherwise. Similarly, if the package id
+    /// refers to a git repo on the local version, also check it out.
     /// (right now we only support git)
     pub fn fetch_git(&self) -> Option<Path> {
 
@@ -87,6 +89,18 @@ impl PkgSrc {
         // Git can't clone into a non-empty directory
         os::remove_dir_recursive(&local);
 
+        debug!("Checking whether %s exists locally. Cwd = %s, does it? %?",
+               self.id.local_path.to_str(),
+               os::getcwd().to_str(),
+               os::path_exists(&*self.id.local_path));
+
+        if os::path_exists(&*self.id.local_path) {
+            debug!("%s exists locally! Cloning it into %s",
+                   self.id.local_path.to_str(), local.to_str());
+            git_clone(&*self.id.local_path, &local, &self.id.version);
+            return Some(local);
+        }
+
         let url = fmt!("https://%s", self.id.remote_path.to_str());
         let branch_args = match self.id.version {
                       NoVersion => ~[],
diff --git a/src/librustpkg/path_util.rs b/src/librustpkg/path_util.rs
index 44bbe36feb8..e4a345733ea 100644
--- a/src/librustpkg/path_util.rs
+++ b/src/librustpkg/path_util.rs
@@ -54,6 +54,7 @@ pub fn rust_path() -> ~[Path] {
     };
     let cwd = os::getcwd();
     // now add in default entries
+    env_rust_path.push(cwd.push(".rust"));
     env_rust_path.push(copy cwd);
     do cwd.each_parent() |p| { push_if_exists(&mut env_rust_path, p) };
     let h = os::homedir();
@@ -61,6 +62,22 @@ pub fn rust_path() -> ~[Path] {
     env_rust_path
 }
 
+pub fn default_workspace() -> Path {
+    let p = rust_path();
+    if p.is_empty() {
+        fail!("Empty RUST_PATH");
+    }
+    let result = p[0];
+    if !os::path_is_dir(&result) {
+        os::mkdir_recursive(&result, U_RWX);
+    }
+    result
+}
+
+pub fn in_rust_path(p: &Path) -> bool {
+    rust_path().contains(p)
+}
+
 pub static U_RWX: i32 = (S_IRUSR | S_IWUSR | S_IXUSR) as i32;
 
 /// Creates a directory that is readable, writeable,
diff --git a/src/librustpkg/rustpkg.rs b/src/librustpkg/rustpkg.rs
index 5e9b9ffa788..46f2d5eb37e 100644
--- a/src/librustpkg/rustpkg.rs
+++ b/src/librustpkg/rustpkg.rs
@@ -38,9 +38,10 @@ use syntax::{ast, diagnostic};
 use util::*;
 use messages::*;
 use path_util::{build_pkg_id_in_workspace, first_pkgid_src_in_workspace};
-use path_util::{U_RWX, rust_path};
-use path_util::{built_executable_in_workspace, built_library_in_workspace};
+use path_util::{U_RWX, rust_path, in_rust_path};
+use path_util::{built_executable_in_workspace, built_library_in_workspace, default_workspace};
 use path_util::{target_executable_in_workspace, target_library_in_workspace};
+use source_control::is_git_dir;
 use workspace::{each_pkg_parent_workspace, pkg_parent_workspaces};
 use context::Ctx;
 use package_id::PkgId;
@@ -57,6 +58,7 @@ mod package_path;
 mod package_source;
 mod path_util;
 mod search;
+mod source_control;
 mod target;
 #[cfg(test)]
 mod tests;
@@ -201,8 +203,10 @@ impl CtxMethods for Ctx {
                 }
                 // The package id is presumed to be the first command-line
                 // argument
-                let pkgid = PkgId::new(copy args[0]);
+                let pkgid = PkgId::new(copy args[0], &os::getcwd());
                 for each_pkg_parent_workspace(&pkgid) |workspace| {
+                    debug!("found pkg %s in workspace %s, trying to build",
+                           pkgid.to_str(), workspace.to_str());
                     self.build(workspace, &pkgid);
                 }
             }
@@ -212,7 +216,7 @@ impl CtxMethods for Ctx {
                 }
                 // The package id is presumed to be the first command-line
                 // argument
-                let pkgid = PkgId::new(copy args[0]);
+                let pkgid = PkgId::new(copy args[0], &os::getcwd());
                 let cwd = os::getcwd();
                 self.clean(&cwd, &pkgid); // tjc: should use workspace, not cwd
             }
@@ -233,9 +237,10 @@ impl CtxMethods for Ctx {
 
                 // The package id is presumed to be the first command-line
                 // argument
-                let pkgid = PkgId::new(args[0]);
+                let pkgid = PkgId::new(args[0], &os::getcwd());
                 let workspaces = pkg_parent_workspaces(&pkgid);
                 if workspaces.is_empty() {
+                    debug!("install! workspaces was empty");
                     let rp = rust_path();
                     assert!(!rp.is_empty());
                     let src = PkgSrc::new(&rp[0], &build_pkg_id_in_workspace(&pkgid, &rp[0]),
@@ -245,6 +250,9 @@ impl CtxMethods for Ctx {
                 }
                 else {
                     for each_pkg_parent_workspace(&pkgid) |workspace| {
+                        debug!("install: found pkg %s in workspace %s, trying to build",
+                               pkgid.to_str(), workspace.to_str());
+
                         self.install(workspace, &pkgid);
                     }
                 }
@@ -272,7 +280,7 @@ impl CtxMethods for Ctx {
                     return usage::uninstall();
                 }
 
-                let pkgid = PkgId::new(args[0]);
+                let pkgid = PkgId::new(args[0], &os::getcwd()); // ??
                 if !installed_packages::package_is_installed(&pkgid) {
                     warn(fmt!("Package %s doesn't seem to be installed! Doing nothing.", args[0]));
                     return;
@@ -304,12 +312,29 @@ impl CtxMethods for Ctx {
     }
 
     fn build(&self, workspace: &Path, pkgid: &PkgId) {
-        debug!("build: workspace = %s pkgid = %s", workspace.to_str(),
+        debug!("build: workspace = %s (in Rust path? %? is git dir? %? \
+                pkgid = %s", workspace.to_str(),
+               in_rust_path(workspace), is_git_dir(&workspace.push_rel(&*pkgid.local_path)),
                pkgid.to_str());
         let src_dir   = first_pkgid_src_in_workspace(pkgid, workspace);
         let build_dir = build_pkg_id_in_workspace(pkgid, workspace);
         debug!("Destination dir = %s", build_dir.to_str());
 
+        // If workspace isn't in the RUST_PATH, and it's a git repo,
+        // then clone it into the first entry in RUST_PATH, and repeat
+        debug!("%? %? %s", in_rust_path(workspace),
+               is_git_dir(&workspace.push_rel(&*pkgid.local_path)),
+               workspace.to_str());
+        if !in_rust_path(workspace) && is_git_dir(&workspace.push_rel(&*pkgid.local_path)) {
+            let out_dir = default_workspace().push("src").push_rel(&*pkgid.local_path);
+            source_control::git_clone(&workspace.push_rel(&*pkgid.local_path),
+                                      &out_dir, &pkgid.version);
+            let default_ws = default_workspace();
+            debug!("Calling build recursively with %? and %?", default_ws.to_str(),
+                   pkgid.to_str());
+            return self.build(&default_ws, pkgid);
+        }
+
         // Create the package source
         let mut src = PkgSrc::new(workspace, &build_dir, pkgid);
         debug!("Package src = %?", src);
diff --git a/src/librustpkg/source_control.rs b/src/librustpkg/source_control.rs
new file mode 100644
index 00000000000..8d125300a33
--- /dev/null
+++ b/src/librustpkg/source_control.rs
@@ -0,0 +1,48 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Utils for working with version control repositories. Just git right now.
+
+use std::{io, os, run, str};
+use version::*;
+
+/// For a local git repo
+pub fn git_clone(source: &Path, target: &Path, v: &Version) {
+    assert!(os::path_is_dir(source));
+    assert!(is_git_dir(source));
+    if !os::path_exists(target) {
+        let version_args = match v {
+            &ExactRevision(ref s) => ~[~"--branch", s.to_owned()],
+            _ => ~[]
+        };
+        debug!("Running: git clone %s %s %s", version_args.to_str(), source.to_str(),
+               target.to_str());
+        let outp = run::process_output("git", ~[~"clone"] + version_args +
+                                       ~[source.to_str(), target.to_str()]);
+        if outp.status != 0 {
+            io::println(str::from_bytes_owned(outp.output.clone()));
+            io::println(str::from_bytes_owned(outp.error));
+            fail!("Couldn't `git clone` %s", source.to_str());
+        }
+    }
+    else {
+        // Pull changes
+        debug!("Running: git --work-tree=%s --git-dir=%s pull --no-edit %s",
+               target.to_str(), target.push(".git").to_str(), source.to_str());
+        let outp = run::process_output("git", [fmt!("--work-tree=%s", target.to_str()),
+                                               fmt!("--git-dir=%s", target.push(".git").to_str()),
+                                               ~"pull", ~"--no-edit", source.to_str()]);
+        assert!(outp.status == 0);
+    }
+}
+
+pub fn is_git_dir(p: &Path) -> bool {
+    os::path_is_dir(&p.push(".git"))
+}
diff --git a/src/librustpkg/tests.rs b/src/librustpkg/tests.rs
index c1bf72e8509..722f01a2564 100644
--- a/src/librustpkg/tests.rs
+++ b/src/librustpkg/tests.rs
@@ -18,7 +18,6 @@ use std::run::ProcessOutput;
 use installed_packages::list_installed_packages;
 use package_path::*;
 use package_id::{PkgId};
-use package_source::*;
 use version::{ExactRevision, NoVersion, Version};
 use path_util::{target_executable_in_workspace, target_library_in_workspace,
                target_test_in_workspace, target_bench_in_workspace,
@@ -52,8 +51,8 @@ fn fake_pkg() -> PkgId {
     }
 }
 
-fn remote_pkg() -> PkgId {
-    let remote = RemotePath(Path("github.com/catamorphism/test-pkg"));
+fn git_repo_pkg() -> PkgId {
+    let remote = RemotePath(Path("mockgithub.com/catamorphism/test-pkg"));
     PkgId {
         local_path: normalize(copy remote),
         remote_path: remote,
@@ -109,6 +108,86 @@ fn mk_temp_workspace(short_name: &LocalPath, version: &Version) -> Path {
     package_dir
 }
 
+/// Should create an empty git repo in p, relative to the tmp dir, and return the new
+/// absolute path
+fn init_git_repo(p: &Path) -> Path {
+    assert!(!p.is_absolute());
+    let tmp = mkdtemp(&os::tmpdir(), "git_local").expect("couldn't create temp dir");
+    let work_dir = tmp.push_rel(p);
+    let work_dir_for_opts = work_dir.clone();
+    assert!(os::mkdir_recursive(&work_dir, U_RWX));
+    debug!("Running: git init in %s", work_dir.to_str());
+    let opts = run::ProcessOptions {
+        env: None,
+        dir: Some(&work_dir_for_opts),
+        in_fd: None,
+        out_fd: None,
+        err_fd: None
+    };
+    let mut prog = run::Process::new("git", [~"init"], opts);
+    let mut output = prog.finish_with_output();
+    if output.status == 0 {
+        // Add stuff to the dir so that git tag succeeds
+        writeFile(&work_dir.push("README"), "");
+        prog = run::Process::new("git", [~"add", ~"README"], opts);
+        output = prog.finish_with_output();
+        if output.status == 0 {
+            prog = run::Process::new("git", [~"commit", ~"-m", ~"whatever"], opts);
+            output = prog.finish_with_output();
+            if output.status == 0 {
+                tmp
+            }
+            else {
+                fail!("Couldn't commit in %s", work_dir.to_str());
+            }
+        }
+        else {
+            fail!("Couldn't add in %s", work_dir.to_str());
+        }
+    }
+    else {
+        fail!("Couldn't initialize git repository in %s", work_dir.to_str())
+    }
+}
+
+fn add_git_tag(repo: &Path, tag: ~str) {
+    assert!(repo.is_absolute());
+    let mut prog = run::Process::new("git", [~"add", ~"-A"],
+                                     run::ProcessOptions { env: None,
+                                                          dir: Some(repo),
+                                                          in_fd: None,
+                                                          out_fd: None,
+                                                          err_fd: None
+                                                         });
+    let output = prog.finish_with_output();
+    if output.status != 0 {
+        fail!("Couldn't add all files in %s", repo.to_str())
+    }
+    prog = run::Process::new("git", [~"commit", ~"-m", ~"whatever"],
+                                     run::ProcessOptions { env: None,
+                                                          dir: Some(repo),
+                                                          in_fd: None,
+                                                          out_fd: None,
+                                                          err_fd: None
+                                                         });
+    let output = prog.finish_with_output();
+    if output.status != 0 {
+        fail!("Couldn't commit in %s", repo.to_str())
+    }
+
+    prog = run::Process::new("git", [~"tag", tag.clone()],
+                                     run::ProcessOptions { env: None,
+                                                          dir: Some(repo),
+                                                          in_fd: None,
+                                                          out_fd: None,
+                                                          err_fd: None
+                                                         });
+    let output = prog.finish_with_output();
+    if output.status != 0 {
+        fail!("Couldn't add git tag %s in %s", tag, repo.to_str())
+    }
+}
+
 fn is_rwx(p: &Path) -> bool {
     use std::libc::consts::os::posix88::{S_IRUSR, S_IWUSR, S_IXUSR};
 
@@ -168,16 +247,6 @@ to make sure the command succeeded
     output
 }
 
-fn make_git_repo(short_name: &str) -> Path {
-    let temp_d = mk_temp_workspace(&normalize(RemotePath(Path(short_name))), &NoVersion);
-    debug!("Dry run: would initialize %s as a git repository", temp_d.pop().pop().to_str());
-    temp_d.pop().pop()
-}
-
-fn add_git_tag(repo: &Path, tag: &str) {
-    debug!("Dry run: would add tag %s to repo %s", tag, repo.to_str());
-}
-
 fn create_local_package(pkgid: &PkgId) -> Path {
     let parent_dir = mk_temp_workspace(&pkgid.local_path, &pkgid.version);
     debug!("Created empty package dir for %s, returning %s", pkgid.to_str(), parent_dir.to_str());
@@ -236,16 +305,19 @@ fn create_local_package_with_custom_build_hook(pkgid: &PkgId,
 
 }
 
-fn assert_lib_exists(repo: &Path, short_name: &str) {
+fn assert_lib_exists(repo: &Path, short_name: &str, v: Version) {
     debug!("assert_lib_exists: repo = %s, short_name = %s", repo.to_str(), short_name);
-    let lib = target_library_in_workspace(&PkgId::new(short_name), repo);
+    let lib = target_library_in_workspace(&(PkgId {
+        version: v, ..PkgId::new(short_name, repo)}
+                                           ), repo);
+    debug!("assert_lib_exists: checking whether %s exists", lib.to_str());
     assert!(os::path_exists(&lib));
     assert!(is_rwx(&lib));
 }
 
 fn assert_executable_exists(repo: &Path, short_name: &str) {
     debug!("assert_executable_exists: repo = %s, short_name = %s", repo.to_str(), short_name);
-    let exec = target_executable_in_workspace(&PkgId::new(short_name), repo);
+    let exec = target_executable_in_workspace(&PkgId::new(short_name, repo), repo);
     assert!(os::path_exists(&exec));
     assert!(is_rwx(&exec));
 }
@@ -394,38 +466,54 @@ fn test_install_invalid() {
     assert!(error_occurred && error1_occurred);
 }
 
+// Tests above should (maybe) be converted to shell out to rustpkg, too
+
 #[test] #[ignore(cfg(target_arch = "x86"))]
-fn test_install_url() {
-    let workspace = mkdtemp(&os::tmpdir(), "test").expect("couldn't create temp dir");
+fn test_install_git() {
     let sysroot = test_sysroot();
     debug!("sysroot = %s", sysroot.to_str());
-    let ctxt = fake_ctxt(Some(@sysroot));
-    let temp_pkg_id = remote_pkg();
+    let temp_pkg_id = git_repo_pkg();
+    let repo = init_git_repo(&Path(temp_pkg_id.local_path.to_str()));
+    let repo_subdir = repo.push("mockgithub.com").push("catamorphism").push("test_pkg");
+    writeFile(&repo_subdir.push("main.rs"),
+              "fn main() { let _x = (); }");
+    writeFile(&repo_subdir.push("lib.rs"),
+              "pub fn f() { let _x = (); }");
+    writeFile(&repo_subdir.push("test.rs"),
+              "#[test] pub fn f() { (); }");
+    writeFile(&repo_subdir.push("bench.rs"),
+              "#[bench] pub fn f() { (); }");
+    add_git_tag(&repo_subdir, ~"0.1"); // this has the effect of committing the files
+
+    debug!("test_install_git: calling rustpkg install %s in %s",
+           temp_pkg_id.local_path.to_str(), repo.to_str());
     // should have test, bench, lib, and main
-    ctxt.install(&workspace, &temp_pkg_id);
+    command_line_test([~"install", temp_pkg_id.local_path.to_str()], &repo);
     // Check that all files exist
-    let exec = target_executable_in_workspace(&temp_pkg_id, &workspace);
+    let ws = repo.push(".rust");
+    debug!("Checking for files in %s", ws.to_str());
+    let exec = target_executable_in_workspace(&temp_pkg_id, &ws);
     debug!("exec = %s", exec.to_str());
     assert!(os::path_exists(&exec));
     assert!(is_rwx(&exec));
     let _built_lib =
         built_library_in_workspace(&temp_pkg_id,
-                                   &workspace).expect("test_install_url: built lib should exist");
-    let lib = target_library_in_workspace(&temp_pkg_id, &workspace);
+                                   &ws).expect("test_install_git: built lib should exist");
+    let lib = target_library_in_workspace(&temp_pkg_id, &ws);
     debug!("lib = %s", lib.to_str());
     assert!(os::path_exists(&lib));
     assert!(is_rwx(&lib));
     let built_test = built_test_in_workspace(&temp_pkg_id,
-                         &workspace).expect("test_install_url: built test should exist");
+                         &ws).expect("test_install_git: built test should exist");
     assert!(os::path_exists(&built_test));
     let built_bench = built_bench_in_workspace(&temp_pkg_id,
-                          &workspace).expect("test_install_url: built bench should exist");
+                          &ws).expect("test_install_git: built bench should exist");
     assert!(os::path_exists(&built_bench));
     // And that the test and bench executables aren't installed
-    let test = target_test_in_workspace(&temp_pkg_id, &workspace);
+    let test = target_test_in_workspace(&temp_pkg_id, &ws);
     assert!(!os::path_exists(&test));
     debug!("test = %s", test.to_str());
-    let bench = target_bench_in_workspace(&temp_pkg_id, &workspace);
+    let bench = target_bench_in_workspace(&temp_pkg_id, &ws);
     debug!("bench = %s", bench.to_str());
     assert!(!os::path_exists(&bench));
 }
@@ -445,18 +533,18 @@ fn test_package_ids_must_be_relative_path_like() {
 
     */
 
-    let whatever = PkgId::new("foo");
+    let whatever = PkgId::new("foo", &os::getcwd());
 
     assert_eq!(~"foo-0.1", whatever.to_str());
     assert!("github.com/catamorphism/test_pkg-0.1" ==
-            PkgId::new("github.com/catamorphism/test-pkg").to_str());
+            PkgId::new("github.com/catamorphism/test-pkg", &os::getcwd()).to_str());
 
     do cond.trap(|(p, e)| {
         assert!("" == p.to_str());
         assert!("0-length pkgid" == e);
         copy whatever
     }).in {
-        let x = PkgId::new("");
+        let x = PkgId::new("", &os::getcwd());
         assert_eq!(~"foo-0.1", x.to_str());
     }
 
@@ -465,7 +553,8 @@ fn test_package_ids_must_be_relative_path_like() {
         assert!("absolute pkgid" == e);
         copy whatever
     }).in {
-        let z = PkgId::new(os::make_absolute(&Path("foo/bar/quux")).to_str());
+        let z = PkgId::new(os::make_absolute(&Path("foo/bar/quux")).to_str(),
+                           &os::getcwd());
         assert_eq!(~"foo-0.1", z.to_str());
     }
 
@@ -473,39 +562,71 @@ fn test_package_ids_must_be_relative_path_like() {
 
 #[test] #[ignore(cfg(target_arch = "x86"))]
 fn test_package_version() {
-    let temp_pkg_id = PkgId::new("github.com/catamorphism/test_pkg_version");
+    let local_path = "mockgithub.com/catamorphism/test_pkg_version";
+    let repo = init_git_repo(&Path(local_path));
+    let repo_subdir = repo.push("mockgithub.com").push("catamorphism").push("test_pkg_version");
+    debug!("Writing files in: %s", repo_subdir.to_str());
+    writeFile(&repo_subdir.push("main.rs"),
+              "fn main() { let _x = (); }");
+    writeFile(&repo_subdir.push("lib.rs"),
+              "pub fn f() { let _x = (); }");
+    writeFile(&repo_subdir.push("test.rs"),
+              "#[test] pub fn f() { (); }");
+    writeFile(&repo_subdir.push("bench.rs"),
+              "#[bench] pub fn f() { (); }");
+    add_git_tag(&repo_subdir, ~"0.4");
+
+    let temp_pkg_id = PkgId::new("mockgithub.com/catamorphism/test_pkg_version", &repo);
     match temp_pkg_id.version {
         ExactRevision(~"0.4") => (),
         _ => fail!(fmt!("test_package_version: package version was %?, expected Some(0.4)",
                         temp_pkg_id.version))
     }
-    let temp = mk_empty_workspace(&LocalPath(Path("test_pkg_version")), &temp_pkg_id.version);
-    let ctx = fake_ctxt(Some(@test_sysroot()));
-    ctx.build(&temp, &temp_pkg_id);
-    assert!(match built_library_in_workspace(&temp_pkg_id, &temp) {
+    // This should look at the prefix, clone into a workspace, then build.
+    command_line_test([~"install", ~"mockgithub.com/catamorphism/test_pkg_version"],
+                      &repo);
+    assert!(match built_library_in_workspace(&temp_pkg_id,
+                                             &repo.push(".rust")) {
         Some(p) => p.to_str().ends_with(fmt!("0.4%s", os::consts::DLL_SUFFIX)),
         None    => false
     });
-    assert!(built_executable_in_workspace(&temp_pkg_id, &temp)
-            == Some(temp.push("build").
-                    push("github.com").
+    assert!(built_executable_in_workspace(&temp_pkg_id, &repo.push(".rust"))
+            == Some(repo.push(".rust").push("build").
+                    push("mockgithub.com").
                     push("catamorphism").
                     push("test_pkg_version").
                     push("test_pkg_version")));
 }
 
-// FIXME #7006: Fails on linux for some reason
-#[test]
-#[ignore]
 fn test_package_request_version() {
-    let temp_pkg_id = PkgId::new("github.com/catamorphism/test_pkg_version#0.3");
-    let temp = mk_empty_workspace(&LocalPath(Path("test_pkg_version")), &ExactRevision(~"0.3"));
-    let pkg_src = PkgSrc::new(&temp, &temp, &temp_pkg_id);
+    let local_path = "mockgithub.com/catamorphism/test_pkg_version";
+    let repo = init_git_repo(&Path(local_path));
+    let repo_subdir = repo.push("mockgithub.com").push("catamorphism").push("test_pkg_version");
+    debug!("Writing files in: %s", repo_subdir.to_str());
+    writeFile(&repo_subdir.push("main.rs"),
+              "fn main() { let _x = (); }");
+    writeFile(&repo_subdir.push("lib.rs"),
+              "pub fn f() { let _x = (); }");
+    writeFile(&repo_subdir.push("test.rs"),
+              "#[test] pub fn f() { (); }");
+    writeFile(&repo_subdir.push("bench.rs"),
+              "#[bench] pub fn f() { (); }");
+    writeFile(&repo_subdir.push("version-0.3-file.txt"), "hi");
+    add_git_tag(&repo_subdir, ~"0.3");
+    writeFile(&repo_subdir.push("version-0.4-file.txt"), "hello");
+    add_git_tag(&repo_subdir, ~"0.4");
+
+/*
+
+    let pkg_src = PkgSrc::new(&repo, &repo, &temp_pkg_id);
     match temp_pkg_id.version {
         ExactRevision(~"0.3") => {
+            debug!("Version matches, calling fetch_git");
             match pkg_src.fetch_git() {
                 Some(p) => {
+                    debug!("does version-0.3-file exist?");
                     assert!(os::path_exists(&p.push("version-0.3-file.txt")));
+                    debug!("does version-0.4-file exist?");
                     assert!(!os::path_exists(&p.push("version-0.4-file.txt")));
 
                 }
@@ -518,24 +639,31 @@ fn test_package_request_version() {
         _ => fail!(fmt!("test_package_version: package version was %?, expected ExactRevision(0.3)",
                         temp_pkg_id.version))
     }
-    let c = fake_ctxt(Some(@test_sysroot()));
-    c.install(&temp, &temp_pkg_id);
-    debug!("installed_library_in_workspace(%s, %s) = %?", temp_pkg_id.short_name, temp.to_str(),
-           installed_library_in_workspace(temp_pkg_id.short_name, &temp));
-    assert!(match installed_library_in_workspace(temp_pkg_id.short_name, &temp) {
+*/
+
+    command_line_test([~"install", fmt!("%s#0.3", local_path)], &repo);
+
+    assert!(match installed_library_in_workspace("test_pkg_version", &repo.push(".rust")) {
         Some(p) => {
             debug!("installed: %s", p.to_str());
             p.to_str().ends_with(fmt!("0.3%s", os::consts::DLL_SUFFIX))
         }
         None    => false
     });
-    assert!(target_executable_in_workspace(&temp_pkg_id, &temp)
-            == temp.push("bin").push("test_pkg_version"));
+    let temp_pkg_id = PkgId::new("mockgithub.com/catamorphism/test_pkg_version#0.3", &repo);
+    assert!(target_executable_in_workspace(&temp_pkg_id, &repo.push(".rust"))
+            == repo.push(".rust").push("bin").push("test_pkg_version"));
 
+    assert!(os::path_exists(&repo.push(".rust").push("src")
+                            .push("mockgithub.com").push("catamorphism")
+                            .push("test_pkg_version-0.3")
+                            .push("version-0.3-file.txt")));
+    assert!(!os::path_exists(&repo.push(".rust").push("src")
+                            .push("mockgithub.com").push("catamorphism")
+                             .push("test_pkg_version-0.3")
+                            .push("version-0.4-file.txt")));
 }
 
-// Tests above should (maybe) be converted to shell out to rustpkg, too
-
 #[test]
 #[ignore (reason = "http-client not ported to rustpkg yet")]
 fn rustpkg_install_url_2() {
@@ -546,15 +674,27 @@ fn rustpkg_install_url_2() {
 
 #[test]
 fn rustpkg_library_target() {
-    let foo_repo = make_git_repo("foo");
-    add_git_tag(&foo_repo, "1.0");
+    let foo_repo = init_git_repo(&Path("foo"));
+    let package_dir = foo_repo.push("foo");
+
+    debug!("Writing files in: %s", package_dir.to_str());
+    writeFile(&package_dir.push("main.rs"),
+              "fn main() { let _x = (); }");
+    writeFile(&package_dir.push("lib.rs"),
+              "pub fn f() { let _x = (); }");
+    writeFile(&package_dir.push("test.rs"),
+              "#[test] pub fn f() { (); }");
+    writeFile(&package_dir.push("bench.rs"),
+              "#[bench] pub fn f() { (); }");
+
+    add_git_tag(&package_dir, ~"1.0");
     command_line_test([~"install", ~"foo"], &foo_repo);
-    assert_lib_exists(&foo_repo, "foo");
+    assert_lib_exists(&foo_repo.push(".rust"), "foo", ExactRevision(~"1.0"));
 }
 
 #[test]
 fn rustpkg_local_pkg() {
-    let dir = create_local_package(&PkgId::new("foo"));
+    let dir = create_local_package(&PkgId::new("foo", &os::getcwd()));
     command_line_test([~"install", ~"foo"], &dir);
     assert_executable_exists(&dir, "foo");
 }
@@ -562,7 +702,7 @@ fn rustpkg_local_pkg() {
 #[test]
 #[ignore] // XXX Failing on dist-linux bot
 fn package_script_with_default_build() {
-    let dir = create_local_package(&PkgId::new("fancy-lib"));
+    let dir = create_local_package(&PkgId::new("fancy-lib", &os::getcwd()));
     debug!("dir = %s", dir.to_str());
     let source = test_sysroot().pop().pop().pop().push("src").push("librustpkg").
         push("testsuite").push("pass").push("src").push("fancy-lib").push("pkg.rs");
@@ -572,7 +712,7 @@ fn package_script_with_default_build() {
         fail!("Couldn't copy file");
     }
     command_line_test([~"install", ~"fancy-lib"], &dir);
-    assert_lib_exists(&dir, "fancy-lib");
+    assert_lib_exists(&dir, "fancy-lib", NoVersion);
     assert!(os::path_exists(&dir.push("build").push("fancy_lib").push("generated.rs")));
 }
 
@@ -633,12 +773,12 @@ fn rust_path_parse() {
 
 #[test]
 fn test_list() {
-    let foo = PkgId::new("foo");
     let dir = mkdtemp(&os::tmpdir(), "test_list").expect("test_list failed");
+    let foo = PkgId::new("foo", &dir);
     create_local_package_in(&foo, &dir);
-    let bar = PkgId::new("bar");
+    let bar = PkgId::new("bar", &dir);
     create_local_package_in(&bar, &dir);
-    let quux = PkgId::new("quux");
+    let quux = PkgId::new("quux", &dir);
     create_local_package_in(&quux, &dir);
 
     command_line_test([~"install", ~"foo"], &dir);
@@ -660,10 +800,10 @@ fn test_list() {
 
 #[test]
 fn install_remove() {
-    let foo = PkgId::new("foo");
-    let bar = PkgId::new("bar");
-    let quux = PkgId::new("quux");
     let dir = mkdtemp(&os::tmpdir(), "install_remove").expect("install_remove");
+    let foo = PkgId::new("foo", &dir);
+    let bar = PkgId::new("bar", &dir);
+    let quux = PkgId::new("quux", &dir);
     create_local_package_in(&foo, &dir);
     create_local_package_in(&bar, &dir);
     create_local_package_in(&quux, &dir);
@@ -688,7 +828,7 @@ fn install_check_duplicates() {
     // ("Is already installed -- doing nothing")
     // check invariant that there are no dups in the pkg database
     let dir = mkdtemp(&os::tmpdir(), "install_remove").expect("install_remove");
-    let foo = PkgId::new("foo");
+    let foo = PkgId::new("foo", &dir);
     create_local_package_in(&foo, &dir);
 
     command_line_test([~"install", ~"foo"], &dir);
@@ -709,7 +849,7 @@ fn install_check_duplicates() {
 #[test]
 #[ignore(reason = "Workcache not yet implemented -- see #7075")]
 fn no_rebuilding() {
-    let p_id = PkgId::new("foo");
+    let p_id = PkgId::new("foo", &os::getcwd());
     let workspace = create_local_package(&p_id);
     command_line_test([~"build", ~"foo"], &workspace);
     let date = datestamp(&built_library_in_workspace(&p_id,
@@ -723,8 +863,8 @@ fn no_rebuilding() {
 #[test]
 #[ignore(reason = "Workcache not yet implemented -- see #7075")]
 fn no_rebuilding_dep() {
-    let p_id = PkgId::new("foo");
-    let dep_id = PkgId::new("bar");
+    let p_id = PkgId::new("foo", &os::getcwd());
+    let dep_id = PkgId::new("bar", &os::getcwd());
     let workspace = create_local_package_with_dep(&p_id, &dep_id);
     command_line_test([~"build", ~"foo"], &workspace);
     let bar_date = datestamp(&lib_output_file_name(&workspace,
@@ -736,8 +876,8 @@ fn no_rebuilding_dep() {
 
 #[test]
 fn do_rebuild_dep_dates_change() {
-    let p_id = PkgId::new("foo");
-    let dep_id = PkgId::new("bar");
+    let p_id = PkgId::new("foo", &os::getcwd());
+    let dep_id = PkgId::new("bar", &os::getcwd());
     let workspace = create_local_package_with_dep(&p_id, &dep_id);
     command_line_test([~"build", ~"foo"], &workspace);
     let bar_date = datestamp(&lib_output_file_name(&workspace, "build", "bar"));
@@ -749,8 +889,8 @@ fn do_rebuild_dep_dates_change() {
 
 #[test]
 fn do_rebuild_dep_only_contents_change() {
-    let p_id = PkgId::new("foo");
-    let dep_id = PkgId::new("bar");
+    let p_id = PkgId::new("foo", &os::getcwd());
+    let dep_id = PkgId::new("bar", &os::getcwd());
     let workspace = create_local_package_with_dep(&p_id, &dep_id);
     command_line_test([~"build", ~"foo"], &workspace);
     let bar_date = datestamp(&lib_output_file_name(&workspace, "build", "bar"));
@@ -764,8 +904,8 @@ fn do_rebuild_dep_only_contents_change() {
 #[test]
 #[ignore(reason = "list not yet implemented")]
 fn test_versions() {
-    let workspace = create_local_package(&PkgId::new("foo#0.1"));
-    create_local_package(&PkgId::new("foo#0.2"));
+    let workspace = create_local_package(&PkgId::new("foo#0.1", &os::getcwd()));
+    create_local_package(&PkgId::new("foo#0.2", &os::getcwd()));
     command_line_test([~"install", ~"foo#0.1"], &workspace);
     let output = command_line_test_output([~"list"]);
     // make sure output includes versions
@@ -775,7 +915,8 @@ fn test_versions() {
 #[test]
 #[ignore(reason = "do not yet implemented")]
 fn test_build_hooks() {
-    let workspace = create_local_package_with_custom_build_hook(&PkgId::new("foo"), "frob");
+    let workspace = create_local_package_with_custom_build_hook(&PkgId::new("foo", &os::getcwd()),
+                                                                "frob");
     command_line_test([~"do", ~"foo", ~"frob"], &workspace);
 }
 
@@ -784,7 +925,7 @@ fn test_build_hooks() {
 #[ignore(reason = "info not yet implemented")]
 fn test_info() {
     let expected_info = ~"package foo"; // fill in
-    let workspace = create_local_package(&PkgId::new("foo"));
+    let workspace = create_local_package(&PkgId::new("foo", &os::getcwd()));
     let output = command_line_test([~"info", ~"foo"], &workspace);
     assert_eq!(str::from_bytes(output.output), expected_info);
 }
@@ -793,7 +934,7 @@ fn test_info() {
 #[ignore(reason = "test not yet implemented")]
 fn test_rustpkg_test() {
     let expected_results = ~"1 out of 1 tests passed"; // fill in
-    let workspace = create_local_package_with_test(&PkgId::new("foo"));
+    let workspace = create_local_package_with_test(&PkgId::new("foo", &os::getcwd()));
     let output = command_line_test([~"test", ~"foo"], &workspace);
     assert_eq!(str::from_bytes(output.output), expected_results);
 }
@@ -801,7 +942,7 @@ fn test_rustpkg_test() {
 #[test]
 #[ignore(reason = "uninstall not yet implemented")]
 fn test_uninstall() {
-    let workspace = create_local_package(&PkgId::new("foo"));
+    let workspace = create_local_package(&PkgId::new("foo", &os::getcwd()));
     let _output = command_line_test([~"info", ~"foo"], &workspace);
     command_line_test([~"uninstall", ~"foo"], &workspace);
     let output = command_line_test([~"list"], &workspace);
diff --git a/src/librustpkg/util.rs b/src/librustpkg/util.rs
index 1ee7caf6d24..c9b9415f872 100644
--- a/src/librustpkg/util.rs
+++ b/src/librustpkg/util.rs
@@ -344,7 +344,7 @@ pub fn find_and_install_dependencies(ctxt: &Ctx,
                     }
                     None => {
                         // Try to install it
-                        let pkg_id = PkgId::new(lib_name);
+                        let pkg_id = PkgId::new(lib_name, &os::getcwd());
                         my_ctxt.install(&my_workspace, &pkg_id);
                         // Also, add an additional search path
                         debug!("let installed_path...")
diff --git a/src/librustpkg/version.rs b/src/librustpkg/version.rs
index 28c3143d8de..5b291164287 100644
--- a/src/librustpkg/version.rs
+++ b/src/librustpkg/version.rs
@@ -89,6 +89,29 @@ pub fn parse_vers(vers: ~str) -> result::Result<semver::Version, ~str> {
     }
 }
 
+/// If `local_path` is a git repo, and the most recent tag in that repo denotes a version,
+/// return it; otherwise, `None`
+pub fn try_getting_local_version(local_path: &Path) -> Option<Version> {
+    debug!("in try_getting_local_version");
+    let outp = run::process_output("git",
+                                   [fmt!("--git-dir=%s", local_path.push(".git").to_str()),
+                                    ~"tag", ~"-l"]);
+
+    debug!("git --git-dir=%s tag -l ~~~> %?", local_path.push(".git").to_str(), outp.status);
+
+    if outp.status != 0 {
+        return None;
+    }
+
+    let mut output = None;
+    let output_text = str::from_bytes(outp.output);
+    for output_text.line_iter().advance |l| {
+        if !l.is_whitespace() {
+            output = Some(l);
+        }
+    }
+    output.chain(try_parsing_version)
+}
 
 /// If `remote_path` refers to a git repo that can be downloaded,
 /// and the most recent tag in that repo denotes a version, return it;