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# GraphicsMagick Mercurial

The GraphicsMagick source code is available via Mercurial. Mercurial is a convenient way for developers from around the country or world to download the GraphicsMagick source, fix bugs, or add new features. Due to the way Mercurial works, it may also be used to manage local changes to GraphicsMagick.

# What is Mercurial?

Mercurial (also known as Hg due to the abbreviation for Mercury in the periodic table of the elements) is a modern source control system which provides anyone who clones a repository with a stand-alone local repository containing the full development history and the ability to select any version of the code. Since the local repository is fully-functional, you may use the same repository to manage your local changes to GraphicsMagick code and you may use the repository to share your changes with others.

# Web Access

The GraphicsMagick repository at SourceForge and GraphicsMagick repository at Heptapod web interfaces are available which may be used to interactively view the latest versions of files (or the changes to files) using your web browser. These two servers will be updated at about the same time so they should normally contain the same content.

# Cloning the Mercurial Repository

To get the tree and place it in a sub-directory of your current working directory, issue the command to one of the two public servers:

    hg clone http://hg.code.sf.net/p/graphicsmagick/code GM

or:

    hg clone https://foss.heptapod.net/graphicsmagick/graphicsmagick GM

The repository is large (e.g. 296M of Hg content, resulting in 450M after files are extracted), so some time may be required to transfer all the changesets. Patience is a virtue!

Please note that since the introduction of an HTTP load balancer, SourceForge has become unreliable when cloning with the default http protocol. Due to this, using ssh protocol may be required. Any SourceForge user who has submitted a SSH private key to SourceForge may use Mercurial over SSH to clone the repository. The ssh clone syntax looks like this (replacing YOURID with your SourceForge user name):

> hg clone ssh://YOURID@hg.code.sf.net/p/graphicsmagick/code GM

# Selecting a version of the code

By default the cloned directory is populated with files from the default (i.e. head) branch of the code, which is where active development happens.

If you require a specific release of GraphicsMagick (e.g. 1.3.40), you may select it like:

    hg update -r GraphicsMagick-1_3_40

or if you require a specific branch of GraphicsMagick (e.g. 1.3), you may use:

    hg update -r GraphicsMagick-1_3

or you may request the files which were current on a specific date:

    hg update -d 2009-01-14

Use:

    hg branches

to see the available branches, and:

    hg tags

to see the available release tags.

# Updating from the Mercurial Repository

To pull more changes from the repository, execute:

    hg pull

and to make them visible in your files (via a merge), execute:

    hg update

or just:

    hg pull -u

The latter pulls down any updates into your local repository and automatically does a merge.

# Mercurial Software

The best place to look for the latest version of Mercurial (Hg) is at the Mercurial web site. Most free operating systems (e.g. Linux, OpenIndiana, and *BSD) will offer a version of Mercurial as an installable package and it may already be installed on your system. We recommend use of TortoiseHg on Microsoft Windows systems since it provides a very nice graphical interface. TortoiseHg is also available on Linux and other systems.

# Mercurial for GraphicsMagick Developers

Since Mercurial is a distributed revision control system, you may clone the GraphicsMagick repository and work for days or weeks (making your own local commits) before you decide to push some or all of your changes to the GraphicsMagick development repository. GraphicsMagick developers first commit changes to their own local repository, then they push their changes to the GraphicsMagick development repository at hg.graphicsmagick.org, later on (after testing and possible fixes) I will push the changes to the stable repository at SourceForge. Pushes to the stable repository at SourceForge should occur at least as often as source code snapshots are produced.

The repository hierarchy is as follows:

1. Local

> The developer makes any local changes and commits what he likes in his own repository. It is best to commit often and whenever all the files have been updated to implement a coherent change or feature (including the ChangeLog file!) since Mercurial stores related changes as a changeset along with the change message you enter. When you push your repository, these changesets and messages are preserved.

2. Unstable

> The unstable development repository is available via ssh at "ssh://yourid@hg.GraphicsMagick.org//hg/GraphicsMagick".

> Where yourid is the Unix user ID on the GraphicsMagick server. The yourid@ part may left out if your client system uses the same user ID as on the GraphicsMagick server.

3. Stable

> The stable repository is available via http at "http://hg.code.sf.net/p/graphicsmagick/code" or "https://foss.heptapod.net/graphicsmagick/graphicsmagick". Any changes in the unstable development repository are pushed to the stable repositories (by the developer responsible for this role) once any necessary adjustments have been made, documentation files have been generated, and the software test suite has passed on at least one machine.

To build your local development repository (as quickly as possible), you may use these steps:

1. Clone the stable repository at SourceForge or Heptapod:

       hg clone http://hg.code.sf.net/p/graphicsmagick/code GM

       or

       hg clone https://foss.heptapod.net/graphicsmagick/graphicsmagick GM

2. Adjust your local repository path default to use the unstable repository.

   Edit .hg/hgrc in your local repository so that it contains:

       [paths]
       default = ssh://yourid@hg.GraphicsMagick.org//hg/GraphicsMagick

   where yourid is the Unix user ID on the GraphicsMagick server.

3. Pull any additional pending updates from the unstable repository:

       hg pull -u

Please note that when ssh access is used, Mercurial uncompresses any data and sends it in uncompressed form. Mercurial expects that compression will be enabled in ssh when needed. One way to enable ssh compression is to put this in your local .hgrc:

    [ui]
    ssh = ssh -C

but ssh also provides its own way to enable compression on a site-by-site basis (e.g. via .ssh/config). For example an entry in .ssh/config will enable use of compression:

    Host hg.GraphicsMagick.org
      Compression yes

# SSH Public Keys For hg.GraphicsMagick.org

For reference, these are the ssh public keys for the server at hg.GraphicsMagick.org:

DSS (DSA):

    ssh-dss   root@src

RSA:

    ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA1IuJDYT85qz/w6+vn5hkpzM5Ju5dsMeJD9GnATj3op5dhBWyfbaJpS7yyK2Vhhz26GBUvUtO3LGm0dQvdj83P3DX3aUuzfnC3Bc9dWeARomQPtDy9MfDikD6kqjD9/Lemgvv8I4Na9vUEmYvXUpTrtawJ4S7A7IctPnvKLPGA5+qY5XzMSE0wcOSBdbeV1PAIDOXYH2hKakZwtxXlvfTv6CZphz/jG5nmf+/Zlkr4yopNvPFbtd3vbaaqSuCoGHXKfmpRko2gXf6EGF92wXzbsE1tW3AkSJ2xdhFHRNmQEu2y9F1l9zb8IETBtKMWRJWAsPPpUSkht0DRsTXt/f+Zw== root@src

ECDSA:

    ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBOrGQ6tjmZvm8w+GP7yLFJ1/vkImKkpXv7kPNxA0+Sfx6WCqAjV0pWP5MVCraP8SNbphL8jiS/x3WADXlf+R2KQ= root@src

ED25519:

    ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAtwIcJEBiSUWsB2sydInR76gE84Jp1rxmc8lTGPg5cB root@src

# Email Notifications

An email notification is sent to the graphicsmagick-commit mailing list at SourceForge whenever a change is submitted to the development (unstable) repository. Subscribe to this list if you would like to be notified by email of changes when they occur.

# Mercurial Topics

- Merge Tool Configuration

- Keep "My" or "Their" files when doing a merge

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