Bikeshed rustpkg

This is Tim's attempt to come up with a schedule for finishing rustpkg, with a proposed deadline for each milestone.

0. Check in concrete test cases and/or English descriptions of how to test for this, for each item below

   Due: 2013-04-17 Done (pending pull request #5920).

   1a. Clarify directory structure for package dirs (src/, lib/, build/, etc.) and make sure test cases reflect that. Also document this in English in a separate document.
   Due: 2013-04-19 Done (pending pull request #5948)

   1b. Incorporate comments at https://github.com/mozilla/rust/pull/5948 Due: 2013-04-22 Done (pending pull request #6008)

1. Fix package searching

   Look for packages in ./src and not in . (as a stopgap before fully implementing RUST_PATH). Basically, respect the directory structure as specified in the draft manual, even if we're only searching in . and not the whole RUST_PATH. In my local copy of src/librustpkg/testsuite/pass, rustpkg build hello-world should work.

   Due: 2013-04-22 Done (pending pull request #6054)

2. Implement install command

   • test cases:
     • main.rs and lib.rs files end up in package source's install dirs (lib and bin by default)
     • test/bench files end up in package source's build dir

   Pull request #6054 adds test cases

   Due: 2013-04-26 Done (pending pull request #6124)

   Except for one hitch: need to infer the sysroot properly, at least for the tests to be able to run Done

3. Full pkgids (#5679)

   • test cases:
     • deeply-nested subdirectory Already working
     • remote (github) URL Done pending pull request #6418
   • Sub-tasks:
     • Allow installing from URLs Pull request #6418
     • Ensure there's no longer any dependency on link name, URL, uuid
     • Wipe out any traces of reverse-DNS-style paths if there are any
     • Make sure, via unit tests, that "package IDs are relative-path-like" is enforced
     • Make sure, via unit tests, that "package IDs have a single stem" is enforced

   Due: 2013-05-12 Done pending #6418

4. Finding external crates (#5681)

   • test cases:
     • a file with extern mod foo where foo lives in a different directory

   Due: 2013-05-14 Done pending #6807

5. Test runner (#5683)

   Due: 2013-05-17 Done

6. Get version from VCS (#5684)

   • test case:
     • use a subdirectory containing a git version, make sure the created executable or library has the right version number in the name

   ~~Due: 2013-05-20~~~ Done pending #6905

7. Implement RUST_PATH (#5682)

   • test cases:
     • searching in ./.rust
     • install; make sure it installs to the first entry in $RUST_PATH
     • install from an entry in RUST_PATH that isn't the first one

   Due: 2013-05-22 Done pending #7397

8. Teach pkg.rs how to execute the default build logic (#6401)

   Due: 2013-05-24 Done pending #7403

9. Commands should work without an explicit package name (#6405)

   • build and install, to start with

   Due: 2013-05-25 Done pending #7419

10. Implement (or test) package database and ability to list, add, remove packages

    • test case:
      • install several packages, make sure they appear in list
      • remove one package, make sure it doesn't appear in list and other packages do

    Due: 2013-05-27

11. extern mod should name a package ID

    • fix #6407 (change what's allowed in an extern mod directive)

    Done pending #8176

12. Track dependencies between Rust packages

    • test case:
      • two packages, A and B; A depends on B with extern mod; building A automatically builds B

    Due: 2013-05-29 Done as part of previous work

13. Use workcache (#7075)

    • test cases:
      • run rustpkg build foo twice, check timestamps to make sure foo isn't built again the second time
      • build foo, which depends on bar, from scratch; check timestamps to make sure foo was built after bar
      • build foo, which depends on bar, from scratch; change bar; rebuild foo; make sure foo was actually rebuilt (i.e. foo's timestamp is later than bar's timestamp)
      • use content hashing and not just datestamps (have tests where one, but not the other, changes)
    • generally, make sure rustpkg build "works like make"
    • This depends on #4432

    Due: 2013-06-04 (Blocked on graydon doing more work on workcache)

14. Extend pkg IDs to specify version explicitly

    • test case:
      • have two versions of package A, A 0.1 and A 0.2; installing A#0.1 doesn't install 0.2, does install 0.1

    At the same time, teach rustpkg about branches and tags (#6411)

    Due: 2013-06-07 Done (#8032)

15. Expose the ability to clone a git repository (#6409)

16. Build C libraries (#6403 and #6404)

17. Finish implementing all other commands (#7242) * do, fetch, info, prefer, test, uninstall, unprefer

18. (wishlist) Track non-Rust dependencies * test case: * allow packages to declare their non-Rust dependencies; add a rustpkg command to print them all out