dirstate-tree: optimize HashMap lookups with raw_entry_mut This switches to using `HashMap` from the hashbrown crate, in order to use its `raw_entry_mut` method. The standard library’s `HashMap` is also based on this same crate, but `raw_entry_mut` is not yet stable there: https://github.com/rust-lang/rust/issues/56167 Using version 0.9 because 0.10 is yanked and 0.11 requires Rust 1.49 This replaces in `DirstateMap::get_or_insert_node` a call to `HashMap<K, V>::entry` with `K = WithBasename<Cow<'on_disk, HgPath>>`. `entry` takes and consumes an "owned" `key: K` parameter, in case a new entry ends up inserted. This key is converted by `to_cow` from a value that borrows the `'path` lifetime. When this function is called by `Dirstate::new_v1`, `'path` is in fact the same as `'on_disk` so `to_cow` can return an owned key that contains `Cow::Borrowed`. For other callers, `to_cow` needs to create a `Cow::Owned` and thus make a costly heap memory allocation. This is wasteful if this key was already present in the map. Even when inserting a new node this is typically the case for its ancestor nodes (assuming most directories have numerous descendants). Differential Revision: https://phab.mercurial-scm.org/D12317

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#!/usr/bin/env python3

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#

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# An example hgweb CGI script, edit as necessary

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# See also https://mercurial-scm.org/wiki/PublishingRepositories

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# Path to repo or hgweb config to serve (see 'hg help hgweb')

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config = b"/path/to/repo/or/config"

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# Uncomment and adjust if Mercurial is not installed system-wide

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# (consult "installed modules" path from 'hg debuginstall'):

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# import sys; sys.path.insert(0, "/path/to/python/lib")

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# Uncomment to send python tracebacks to the browser if an error occurs:

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# import cgitb; cgitb.enable()

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from mercurial import demandimport

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demandimport.enable()

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from mercurial.hgweb import hgweb, wsgicgi

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application = hgweb(config)

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wsgicgi.launch(application)