1601170 - Update the version of mercurial on the transplant server

Status: RESOLVED WONTFIX

(Conduit Graveyard :: Transplant, task)

Description

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The transplant server is running a very old version of Mercurial (4.5.3).

We should switch from installing it via yum to pip, and install the latest version.

Comment 1

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Attachment: Bug 1601170 - update hgext/rewrite.py; r=smacleod

Update the vendored copy of rewrite.py from VCT (autoformatted with
black).

Comment 2

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Attachment: Bug 1601170 - Remove system-wide hg, link system hg to autoland's; r=smacleod

Currently there's three possible methods for installing Mercurial, yum,
system-pip, and into autoland's venv (although on production only yum
and autoland_venv are present). It's possible for the Mercurial
version to be different in each of these locations.

To make it easier to reason about the version of Mercurial used by
autoland, and to make it easier to upgrade, remove the system-wide
packages and symlink /usr/bin/hg to the version of hg installed into
autoland's virtualenv.

Depends on D55814

Comment 3

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Attachment: Bug 1601170 - Bump the version of Mercurial to 5.2; r=smacleod

Bump the version of Mercurial, updating hgexts to match.

The change to test-rewrite-commit-descriptions.t allows the test suite
to take the same path as production requests - where a truncated sha is
always provided as the base revision, which requires expansion to a full
node in newer Mercurial versions.

Depends on D55815