Generate ref updates in Mercurial hooks
6f3a99eb392e
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Description

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