Mercurial-6.8.1

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### Chapter 13. Programming

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# Mercurial-6.8.1

## Introduction to Mercurial

Mercurial is a distributed source control management tool similar to Git and Bazaar. Mercurial is written in Python and is used by projects such as Mozilla for Firefox and Thunderbird.

This package is known to build and work properly using an LFS 12.2 platform.

### Package Information

- Download (HTTP): https://www.mercurial-scm.org/release/mercurial-6.8.1.tar.gz

- Download MD5 sum: f0c076d22c07bf65ffb02753fc516084

- Download size: 7.9 MB

- Estimated disk space required: 113 MB (with docs, add 1.5 GB for tests)

- Estimated build time: 0.3 SBU (with docs; add 16 SBU for tests; both using parallelism=8)

### Mercurial Dependencies

#### Optional

docutils-0.21.2 (required to build the documentation), git-2.46.0, GPGME-1.23.2 (with Python bindings), OpenSSH-9.8p1 (runtime, to access ssh://... repositories), Pygments-2.18.0, rustc-1.80.1 (see `rust/README.rst` and `rust/rhg/README.md`), Subversion-1.14.3 (with Python bindings), Bazaar, CVS, pyflakes, pyOpenSSL, and re2

## Installation of Mercurial

Build Mercurial by issuing the following command:

    make build

To build the documentation (requires docutils-0.21.2), issue:

    make doc

If you wish to run the tests, the rust tests must be removed as they are currently broken due to syntax errors. To do this, issue:

    sed -i '138,142d' Makefile

To run the test suite, issue:

    TESTFLAGS="-j<N> --tmpdir tmp" make check

where `<N>` is an integer between one and the number of ( processor X threads ), inclusive. Tests may fail because some error messages have changed in Python or some deprecation warnings are printed that were not present when the test was designed. Two tests are known to fail: test-duplicateoptions.py and test-profile.t.

In order to investigate any apparently failing tests, you may use the run-tests.py script. To see the almost forty switches, some of them very useful, issue tests/run-tests.py --help. Running the following commands, you will execute only the tests that failed before:

    pushd tests  &&
      rm -rf tmp &&
      ./run-tests.py --tmpdir tmp test-gpg.t
    popd

Normally, the previous failures will be reproducible. However, if you add the switch `--debug` before `--tmpdir`, and run the tests again, some failures may disappear, which is a problem with the test suite. If this happens, there will be no more of these failures even if you do not pass the --debug switch again.

An interesting switch is `--time`, which will generate a table of all the executed tests and their respective start, end, user, system and real times once the tests are complete. Note that these switches may be used with make check by including them in the `TESTFLAGS` environment variable.

Install Mercurial by running the following command (as `root`):

    make PREFIX=/usr install-bin

If you built the documentation, install it by running the following command (as `root`):

    make PREFIX=/usr install-doc

After installation, two very quick and simple tests should run correctly. The first one needs some configuration:

    cat >> ~/.hgrc << "EOF"
    [ui]
    username = <user_name> <user@mail>
    EOF

where you must replace <user_name> and <your@mail> (mail is optional and can be omitted). With the user identity defined, run hg debuginstall and several lines will be displayed, the last one reading "no problems detected". Another quick and simple test is just hg, which should output basic commands that can be used with hg.

## Configuring Mercurial

### Config Files

`/etc/mercurial/hgrc` and `~/.hgrc`

The great majority of extensions are disabled by default. Run hg help extensions if you need to enable any, e.g. when investigating test failures. This will output a list of enabled and disabled extensions, as well as more information such as how to enable or disable extensions using configuration files.

If you have installed make-ca-1.14 and want Mercurial to use the certificates, as the `root` user, issue:

    install -v -d -m755 /etc/mercurial &&
    cat > /etc/mercurial/hgrc << "EOF"
    [web]
    cacerts = /etc/pki/tls/certs/ca-bundle.crt
    EOF

## Contents

Installed Programs: hg
Installed Libraries: several internal modules under /usr/lib/python3.12/site-packages/mercurial
Installed Directories: /etc/mercurial, /usr/lib/python3.12/site-packages/hgdemandimport, /usr/lib/python3.12/site-packages/hgext, /usr/lib/python3.12/site-packages/hgext3rd, /usr/lib/python3.12/site-packages/mercurial, and /usr/lib/python3.12/site-packages/mercurial-6.8.1-py3.12.egg-info

### Short Descriptions

hg | is the mercurial version control system

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