Throw instead of log for invalid properties

Summary: Continue work started at D3601.

Test Plan:
Commented declaration `AphrontController::$request`, saw exception.
Brought it back, didn't see exception.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4233
Fix IRC bot Dxxx Conduit call.

Summary: Some fallout from D4191.

Test Plan: Sent "D12" in IRC and got a response.

Reviewers: epriestley, vrana, zeeg

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4235
Fix bugs when saving package changes due to commit changes

Summary:
Because of the way PhabricatorOwnersPackage works, the code to save package
changes when parsing commit changes was raising a few undefined index errors,
and was throwing an exception trying to call a method on null (because not
all of the phids related to the package had their handles loaded). This fix
doesn't load the missing handles, it just avoids trying to use them.

Test Plan:
./scripts/repository/reparse.php on a commit with path changes that triggered
a package change

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4236
fix differential + diffusion for showing generated files

Summary: in the re-factor quest this got broken. Turns out NewLines (aka $this->new in the parser) gets updated right up until the very end for showing text changes so instead pass over the total line count to the renderer to get this codepath right.

Test Plan: showed content of some generated files in diffusion and all was well

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2204

Differential Revision: https://secure.phabricator.com/D4237
Make Repositories partially policy-aware

Summary: Small step toward repository hosting. No user-visible changes.

Test Plan: Looked at repositories in Diffusion.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D4227
Implement SSHD glue and Conduit SSH endpoint

Summary:
  - Build "sshd-auth" (for authentication) and "sshd-exec" (for command execution) binaries. These are callable by "sshd-vcs", located [[https://github.com/epriestley/sshd-vcs | in my account on GitHub]]. They are based on precursors [[https://github.com/epriestley/sshd-vcs-glue | here on GitHub]] which I deployed for TenXer about a year ago, so I have some confidence they at least basically work.
    - The problem this solves is that normally every user would need an account on a machine to connect to it, and/or their public keys would all need to be listed in `~/.authorized_keys`. This is a big pain in most installs. Software like Gitosis/Gitolite solve this problem by giving you an easy way to add public keys to `~/.authorized_keys`, but this is pretty gross.
    - Roughly, instead of looking in `~/.authorized_keys` when a user connects, the patched sshd instead runs `echo <public key> | sshd-auth`. The `sshd-auth` script looks up the public key and authorizes the matching user, if they exist. It also forces sshd to run `sshd-exec` instead of a normal shell.
    - `sshd-exec` receives the authenticated user and any command which was passed to ssh (like `git receive-pack`) and can route them appropriately.
    - Overall, this permits a single account to be set up on a server which all Phabricator users can connect to without any extra work, and which can safely execute commands and apply appropriate permissions, and disable users when they are disabled in Phabricator and all that stuff.
  - Build out "sshd-exec" to do more thorough checks and setup, and delegate command execution to Workflows (they now exist, and did not when I originally built this stuff).
  - Convert @btrahan's conduit API script into a workflow and slightly simplify it (ConduitCall did not exist at the time it was written).

The next steps here on the Repository side are to implement Workflows for Git, SVN and HG wire protocols. These will mostly just proxy the protocols, but also need to enforce permissions. So the approach will basically be:

  - Implement workflows for stuff like `git receive-pack`.
  - These workflows will implement enough of the underlying protocol to determine what resource the user is trying to access, and whether they want to read or write it.
  - They'll then do a permissons check, and kick the user out if they don't have permission to do whatever they are trying to do.
  - If the user does have permission, we just proxy the rest of the transaction.

Next steps on the Conduit side are more simple:

  - Make ConduitClient understand "ssh://" URLs.

Test Plan: Ran `sshd-exec --phabricator-ssh-user epriestley conduit differential.query`, etc. This will get a more comprehensive test once I set up sshd-vcs.

Reviewers: btrahan, vrana

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603, T550

Differential Revision: https://secure.phabricator.com/D4229
Fix various issues with SSH receivers

Summary:
  - Original command is in SSH_ORIGINAL_COMMAND, not normal argv.
  - Use PhutilShellLexer to parse it.
  - Fix a protocol encoding issue with ConduitSSHWorkflow. I think I'm going to make this protocol accept multiple commands anyway because SSH pipes are crazy expensive to build (even locally, they're ~300ms).

Test Plan: With other changes, successfully executed "arc list --conduit-uri=ssh://localhost:2222".

Reviewers: btrahan, vrana

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T550

Differential Revision: https://secure.phabricator.com/D4232
Merge branch 'master' into disqus