Save ApplicationSearch queries generated from GET parameters in the request

Summary:
Fixes T4239. Currently, if you go to `/maniphest/?authors=alincoln`, operations dependent on the query key (like "Save Custom Query..." and "Export to Excel...") don't have a query key to work with. Make sure they have one.

Also remove a stray `phlog()`.

Test Plan: "Save Custom Query...", etc., now work on GET queries.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4239

Differential Revision: https://secure.phabricator.com/D7777
Make it harder to misconfigure `phpmailer.smtp-protocol`

Summary: Until we implement an "enum" type for config, make this a bit harder to get wrong. A user entered "TLS", but the correct value is "tls". The documentation is consistent about this, but the behavior is sitll surprsing.

Test Plan: eyeballed it

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7778
Limit memory usage of `ssh-exec` during large pull operations

Summary: Fixes T4241. Ref T4206. See T4241 for a description here. Generally, when we connect a fat pipe (`git-upload-pack`) to a narrow one (`git` over SSH) we currently read limitless data into memory. Instead, throttle reads until writes catch up. This is now possible because of the previous changes in this sequence.

Test Plan:
  - Ran `git clone` and `git push` on the entire Wine repository.
  - Observed CPU and memory usage.
  - Memory usage was constant and low, CPU usage was high only during I/O (which is expected, since we have to actually do work, although thre might be room to further reduce this).

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4241, T4206

Differential Revision: https://secure.phabricator.com/D7776
WIP
Restructure HookEngine to use PushLog records for all operations

Summary:
Ref T4195. This pulls the central logic of HookEngine up one level and makes all the git stuff genrate PushLogs.

In future diffs, everything will generate PushLogs and we can hand those off to Herald.

Test Plan:
Pushed a pile of valid/invalid stuff:

{F89256}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7761
Generate ref updates in Mercurial hooks

Summary: Ref T4195. Mercurial is not my favorite VCS.

Test Plan:
Hit the split branches case:

  >>> orbital ~/repos/INIH $ hg push --force
  pushing to ssh://dweller@local.aphront.com/diffusion/INIH
  searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 2 changesets with 2 changes to 1 files (+1 heads)
  remote: +---------------------------------------------------------------+
  remote: |      * * * PUSH REJECTED BY EVIL DRAGON BUREAUCRATS * * *     |
  remote: +---------------------------------------------------------------+
  remote:             \
  remote:              \                    ^    /^
  remote:               \                  / \  // \
  remote:                \   |\___/|      /   \//  .\
  remote:                 \  /V  V  \__  /    //  | \ \           *----*
  remote:                   /     /  \/_/    //   |  \  \          \   |
  remote:                   @___@`    \/_   //    |   \   \         \/\ \
  remote:                  0/0/|       \/_ //     |    \    \         \  \
  remote:              0/0/0/0/|        \///      |     \     \       |  |
  remote:           0/0/0/0/0/_|_ /   (  //       |      \     _\     |  /
  remote:        0/0/0/0/0/0/`/,_ _ _/  ) ; -.    |    _ _\.-~       /   /
  remote:                    ,-}        _      *-.|.-~-.           .~    ~
  remote:   \     \__/        `/\      /                 ~-. _ .-~      /
  remote:    \____(Oo)           *.   }            {                   /
  remote:    (    (--)          .----~-.\        \-`                 .~
  remote:    //__\\  \ DENIED!  ///.----..<        \             _ -~
  remote:   //    \\               ///-._ _ _ _ _ _ _{^ - - - - ~
  remote:
  remote:
  remote: DANGEROUS CHANGE: The change you're attempting to push splits the head of branch 'default' into multiple heads: 802c785c3dd9, e73400db39b0. This is inadvisable and dangerous.
  remote: Dangerous change protection is enabled for this repository.
  remote: Edit the repository configuration before making dangerous changes.
  remote:
  remote: transaction abort!
  remote: rollback completed
  remote: abort: pretxnchangegroup.phabricator hook exited with status 1

Hit the divergent heads case:

  >>> orbital ~/repos/INIH $ hg push --force
  pushing to ssh://dweller@local.aphront.com/diffusion/INIH
  searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 1 changesets with 1 changes to 1 files (+1 heads)
  remote: +---------------------------------------------------------------+
  remote: |      * * * PUSH REJECTED BY EVIL DRAGON BUREAUCRATS * * *     |
  remote: +---------------------------------------------------------------+
  remote:             \
  remote:              \                    ^    /^
  remote:               \                  / \  // \
  remote:                \   |\___/|      /   \//  .\
  remote:                 \  /V  V  \__  /    //  | \ \           *----*
  remote:                   /     /  \/_/    //   |  \  \          \   |
  remote:                   @___@`    \/_   //    |   \   \         \/\ \
  remote:                  0/0/|       \/_ //     |    \    \         \  \
  remote:              0/0/0/0/|        \///      |     \     \       |  |
  remote:           0/0/0/0/0/_|_ /   (  //       |      \     _\     |  /
  remote:        0/0/0/0/0/0/`/,_ _ _/  ) ; -.    |    _ _\.-~       /   /
  remote:                    ,-}        _      *-.|.-~-.           .~    ~
  remote:   \     \__/        `/\      /                 ~-. _ .-~      /
  remote:    \____(Oo)           *.   }            {                   /
  remote:    (    (--)          .----~-.\        \-`                 .~
  remote:    //__\\  \ DENIED!  ///.----..<        \             _ -~
  remote:   //    \\               ///-._ _ _ _ _ _ _{^ - - - - ~
  remote:
  remote:
  remote: DANGEROUS CHANGE: The change you're attempting to push creates new, divergent heads for the branch 'default': f56af4232aa9. This is inadvisable and dangerous.
  remote: Dangerous change protection is enabled for this repository.
  remote: Edit the repository configuration before making dangerous changes.
  remote:
  remote: transaction abort!
  remote: rollback completed
  remote: abort: pretxnchangegroup.phabricator hook exited with status 1

Did a bunch of good/bad pushes:

{F89300}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7763
Support bookmark hook operations in Mercurial

Summary: Ref T4195. Turns bookmark mutations in Mercurial into log objects.

Test Plan:
Pushed a pile of bookmarks and got logs:

{F89313}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7764
Revert errant commit of example change from an earlier test.

Reverts rP488d4c509dc328ff47b44a3566edb2a15dc3ff9f.
Remove "pretag" hook support in Mercurial

Summary: Ref T4195. This doesn't actually work like I thought it did: it only fires locally, when you run `hg tag`. Mercurial tags are also weird and basically don't make any sense and everyone should use bookmarks instead. We could implement some flavor of this eventually, but I'd like to see users request it first. They can implement their own with content-based hooks once those work, anyway.

Test Plan: This code didn't do anything.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7765
Add Subversion ref and content logs to pre-commit hooks

Summary: Ref T4195. SVN has no such thing as refs (I was thinking about writing a quasi-ref anyway like `HEAD: r23 -> r24`, but I'm not sure it would actually be useful). And content is very easy to build.

Test Plan: Pushed some stuff to SVN, got logs from it.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7766
Assign PHIDs to PushLogs

Summary: Ref T4195. We need these in Herald, since HeraldTranscripts need to refer to a PHID which they acted upon.

Test Plan:
Ran migration, got PHIDs:

  mysql> select phid from repository_pushlog limit 3;
  +--------------------------------+
  | phid                           |
  +--------------------------------+
  | PHID-PSHL-25jnc6cjgzw5rwqgmr7r |
  | PHID-PSHL-2vrvmtslkrj5yv7nxsv2 |
  | PHID-PSHL-34x262zkrwoka6mplony |
  +--------------------------------+
  3 rows in set (0.00 sec)

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7780
Add `rulePHID` to HeraldEffect

Summary: Ref T4195. Herald rules gained PHIDs only recently, propagate them to HeraldEffect to make some of the hook stuff eaiser.

Test Plan: iiam

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7781
Add Herald support for blocking ref changes

Summary: Ref T4195. Allows users to write Herald rules which block ref changes. For example, you can write a rule like `alincoln can not create branches`, or `no one can push to the branch "frozen"`.

Test Plan:
This covers a lot of ground. I created and pushed a bunch of rules, then looked at transcripts, in general. Here are some bits in detail:

Here's a hook-based reject message:

  >>> orbital ~/repos/POEMS $ git push
  Counting objects: 5, done.
  Delta compression using up to 8 threads.
  Compressing objects: 100% (3/3), done.
  Writing objects: 100% (3/3), 274 bytes, done.
  Total 3 (delta 2), reused 0 (delta 0)
  remote: +---------------------------------------------------------------+
  remote: |      * * * PUSH REJECTED BY EVIL DRAGON BUREAUCRATS * * *     |
  remote: +---------------------------------------------------------------+
  remote:             \
  remote:              \                    ^    /^
  remote:               \                  / \  // \
  remote:                \   |\___/|      /   \//  .\
  remote:                 \  /V  V  \__  /    //  | \ \           *----*
  remote:                   /     /  \/_/    //   |  \  \          \   |
  remote:                   @___@`    \/_   //    |   \   \         \/\ \
  remote:                  0/0/|       \/_ //     |    \    \         \  \
  remote:              0/0/0/0/|        \///      |     \     \       |  |
  remote:           0/0/0/0/0/_|_ /   (  //       |      \     _\     |  /
  remote:        0/0/0/0/0/0/`/,_ _ _/  ) ; -.    |    _ _\.-~       /   /
  remote:                    ,-}        _      *-.|.-~-.           .~    ~
  remote:   \     \__/        `/\      /                 ~-. _ .-~      /
  remote:    \____(Oo)           *.   }            {                   /
  remote:    (    (--)          .----~-.\        \-`                 .~
  remote:    //__\\  \ DENIED!  ///.----..<        \             _ -~
  remote:   //    \\               ///-._ _ _ _ _ _ _{^ - - - - ~
  remote:
  remote:
  remote: This commit was rejected by Herald pre-commit rule H24.
  remote: Rule: No Branches Called Blarp
  remote: Reason: "blarp" is a bad branch name
  remote:
  To ssh://dweller@localhost/diffusion/POEMS/
   ! [remote rejected] blarp -> blarp (pre-receive hook declined)
  error: failed to push some refs to 'ssh://dweller@localhost/diffusion/POEMS/'

Here's a transcript, showing that all the field values populate sensibly:

{F90453}

Here's a rule:

{F90454}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7782
Work around `hg` echoing warnings to stdout under --debug

Summary:
Ref T615. Ref T4237. With `--debug`, Mercurial will echo an "ignoring untrusted configuration option" warning **to stdout** if `.hgrc` has the wrong owner.

However, we need `--debug` to make `{parents}` usable, at least until the patches I got into the upstream are widely deployed. So after getting `--debug` output, strip off any leading warnings.

These warnings should always be in English, at least, since we set `LANG` explicitly.

Test Plan: Unit tests. @asherkin, maybe you can confirm this? I can't actually get the warning, but I think my `hg` in PATH is just a bit out of date.

Reviewers: asherkin, btrahan

Reviewed By: asherkin

CC: asherkin, aran

Maniphest Tasks: T615, T4237

Differential Revision: https://secure.phabricator.com/D7784
Truncate object fields in Herald transcripts

Summary:
A few users have hit cases where Herald transcripts of large commits exceed the MySQL packet limit, because one of the fields in the transcript is an enomrous textual diff.

There's no value in saving these huge amounts of data. Transcripts are useful for understanding the action of Herald rules, but can be reconstructed later. Instead of saving all of the data, limit each field to 4KB of data.

For strings, we just truncate at 4KB. For arrays, we truncate after 4KB of values.

Test Plan: Ran unit tests. Artificially decreased limit and ran transcripts, saw them truncate properly.

Reviewers: btrahan

Reviewed By: btrahan

CC: frgtn, aran

Differential Revision: https://secure.phabricator.com/D7783
Remove many redundant implementations of `canLoadNamedObject()`

Summary:
These just got copy/pasted like crazy, the base class has the correct default implementation.

(I'm adding "H" for Herald Rules, which is why I was in this code.)

I also documented the existing prefixes at [[ Object Name Prefixes ]].

Test Plan: Verified base implementation. Typed some object names into the jump nav.

Reviewers: btrahan

Reviewed By: btrahan

CC: hach-que, aran

Differential Revision: https://secure.phabricator.com/D7785
Give Herald rules a standard "Hnnn" object name

Summary: Allow Herald rules to be referred to with `H123`, etc., like other object types are. Herald rules now have proper PHIDs and an increasingly prominent role in triggering application actions. Although I suspect users will rarely use `H123` in Remarkup to mention rules, this can simplify some of the interfaces which relate objects across systems.

Test Plan: Looked at various interfaces and saw `H123` names. Mentioned `H123` in remarkup.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7786
Provide basic commit content hooks for Herald

Summary: Ref T4195. This doesn't provide any interesting fields yet (content, affected paths, commit message) but fires the hook correctly.

Test Plan: Added a blocking hook and saw it fire.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7789
Support "changed filename" and "file content" fields for commit content Herald rules

Summary: Ref T4195. Adds support for diff content rules.

Test Plan: Pushed SVN and Git changes through, saw them generate reasonable transcripts. Mercurial still isn't hooked up to this phase.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7791
Support content pre-commit hooks in Mercurial

Summary: Ref T4195. Add Mercurial support to the content hook phase.

Test Plan:
Here are some `commit` push logs for a Mercurial repo:

{F90689}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7792