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Disambiguate various types of Mercurial remote markers with "hg arc-ls-remote"

Authored by epriestley on Jun 9 2020, 5:23 PM.

Description

Disambiguate various types of Mercurial remote markers with "hg arc-ls-remote"

Summary: Ref T13546. Ref T9948. It seems challenging to examine a remote in vanilla Mercurial. Provide an "hg arc-ls-remote" command which functions like "git ls-remote" so we can figure out if "--into X" is a bookmark, branch, both, neither, or a branch with multiple heads without mutating the working copy as a side effect.

Test Plan: Ran various "arc land --into ..." commands in a Mercurial working copy, saw apparently-sensible resolution of remote marker names.

Maniphest Tasks: T13546, T9948

Differential Revision: https://secure.phabricator.com/D21343