upstream/mercurial-mirror Files · rust/README.rst

copies: don't filter out copy targets created on other side of merge commit...

copies: don't filter out copy targets created on other side of merge commit If file X is copied to Y on one side of merge and the other side creates Y (no copy), we would not mark that as copy. In the changeset-centric pathcopies() version, that was done by checking if the copy target existed on the other branch. Even though merge commits are pretty uncommon, it still turned out to be too expensive to load the manifest of the parents of merge commits. In a repo of mozilla-unified converted to storing copies in changesets, about 2m30s of `hg debugpathcopies FIREFOX_BETA_59_END FIREFOX_BETA_60_BASE` is spent on this check of merge commits. I tried to think of a way of storing more information in the changesets in order to cheaply detect these cases, but I couldn't think of a solution. So this patch simply removes those checks. For reference, these extra copies are reported from the aforementioned command after this patch: browser/base/content/sanitize.js -> browser/modules/Sanitizer.jsm testing/mozbase/mozprocess/tests/process_normal_finish_python.ini -> testing/mozbase/mozprocess/tests/process_normal_finish.ini testing/mozbase/mozprocess/tests/process_waittimeout_python.ini -> testing/mozbase/mozprocess/tests/process_waittimeout.ini testing/mozbase/mozprocess/tests/process_waittimeout_10s_python.ini -> testing/mozbase/mozprocess/tests/process_waittimeout_10s.ini Since these copies were created on one side of some merge, it still seems reasonable to include them, so I'm not even sure it's worse than filelog pathcopies(), just different. Differential Revision: https://phab.mercurial-scm.org/D6420

Gregory Szorc - - Load All Authors

File last commit:

r35587:96421278 default


                r42686:35d674a3

default

Download file

             README.rst
        
                    78 lines
            
             | 2.2 KiB
            
                | text/x-rst
            
             |
                RstLexer
            
             / rust / README.rst
          
                    History
                
                 |
                  Source
                 | Raw
                 |Copy content
                 |Copy permalink

        Gregory Szorc
    
rust: implementation of `hg`...

              r35587
            
      ===================

      Mercurial Rust Code

      ===================

      This directory contains various Rust code for the Mercurial project.

      The top-level ``Cargo.toml`` file defines a workspace containing

      all primary Mercurial crates.

      Building

      ========

      To build the Rust components::

         $ cargo build

      If you prefer a non-debug / release configuration::

         $ cargo build --release

      Features

      --------

      The following Cargo features are available:

      localdev (default)

         Produce files that work with an in-source-tree build.

         In this mode, the build finds and uses a ``python2.7`` binary from

         ``PATH``. The ``hg`` binary assumes it runs from ``rust/target/<target>hg``

         and it finds Mercurial files at ``dirname($0)/../../../``.

      Build Mechanism

      ---------------

      The produced ``hg`` binary is *bound* to a CPython installation. The

      binary links against and loads a CPython library that is discovered

      at build time (by a ``build.rs`` Cargo build script). The Python

      standard library defined by this CPython installation is also used.

      Finding the appropriate CPython installation to use is done by

      the ``python27-sys`` crate's ``build.rs``. Its search order is::

      1. ``PYTHON_SYS_EXECUTABLE`` environment variable.

      2. ``python`` executable on ``PATH``

      3. ``python2`` executable on ``PATH``

      4. ``python2.7`` executable on ``PATH``

      Additional verification of the found Python will be performed by our

      ``build.rs`` to ensure it meets Mercurial's requirements.

      Details about the build-time configured Python are built into the

      produced ``hg`` binary. This means that a built ``hg`` binary is only

      suitable for a specific, well-defined role. These roles are controlled

      by Cargo features (see above).

      Running

      =======

      The ``hgcli`` crate produces an ``hg`` binary. You can run this binary

      via ``cargo run``::

         $ cargo run --manifest-path hgcli/Cargo.toml

      Or directly::

         $ target/debug/hg

         $ target/release/hg

      You can also run the test harness with this binary::

         $ ./run-tests.py --with-hg ../rust/target/debug/hg

      .. note::

         Integration with the test harness is still preliminary. Remember to

         ``cargo build`` after changes because the test harness doesn't yet

         automatically build Rust code.

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

Gregory Szorc rust: implementation of `hg`...	r35587	===================
		Mercurial Rust Code
		===================

		This directory contains various Rust code for the Mercurial project.

		The top-level ``Cargo.toml`` file defines a workspace containing
		all primary Mercurial crates.

		Building
		========

		To build the Rust components::

		$ cargo build

		If you prefer a non-debug / release configuration::

		$ cargo build --release

		Features
		--------

		The following Cargo features are available:

		localdev (default)
		Produce files that work with an in-source-tree build.

		In this mode, the build finds and uses a ``python2.7`` binary from
		``PATH``. The ``hg`` binary assumes it runs from ``rust/target/<target>hg``
		and it finds Mercurial files at ``dirname($0)/../../../``.

		Build Mechanism
		---------------

		The produced ``hg`` binary is bound to a CPython installation. The
		binary links against and loads a CPython library that is discovered
		at build time (by a ``build.rs`` Cargo build script). The Python
		standard library defined by this CPython installation is also used.

		Finding the appropriate CPython installation to use is done by
		the ``python27-sys`` crate's ``build.rs``. Its search order is::

		1. ``PYTHON_SYS_EXECUTABLE`` environment variable.
		2. ``python`` executable on ``PATH``
		3. ``python2`` executable on ``PATH``
		4. ``python2.7`` executable on ``PATH``

		Additional verification of the found Python will be performed by our
		``build.rs`` to ensure it meets Mercurial's requirements.

		Details about the build-time configured Python are built into the
		produced ``hg`` binary. This means that a built ``hg`` binary is only
		suitable for a specific, well-defined role. These roles are controlled
		by Cargo features (see above).

		Running
		=======

		The ``hgcli`` crate produces an ``hg`` binary. You can run this binary
		via ``cargo run``::

		$ cargo run --manifest-path hgcli/Cargo.toml

		Or directly::

		$ target/debug/hg
		$ target/release/hg

		You can also run the test harness with this binary::

		$ ./run-tests.py --with-hg ../rust/target/debug/hg

		.. note::

		Integration with the test harness is still preliminary. Remember to
		``cargo build`` after changes because the test harness doesn't yet
		automatically build Rust code.