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GNU Arch






The GNU Arch Revision Control System







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Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>. Redistribution permitted under the GNU GPL Version 2.
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Revision Control

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Revision control involves:
	Revisions.
		A specific copy of a file or project. A revision has predecessors and successors, which gives an ordering: given two revisions for a file, one is logically 'before' the other.
	Projects AKA modules AKA categories.
		A group of files collected together, usually tightly bound to the same concept or issue.
		I.E. 'My system config'. 'Squid'. 'm4'.
	Branches aka forks.
		A set of Revisions all related by the nature of the changes involved.
			linux 2.4 / linux 2.5 / linux 2.6
			mainline / experimental / feature-X
	Merging
		Taking the some or all of the changes within a branch and applying them to another branch.
			backporting fix X from linux 2.6 to 2.4.
			applying the changes made in an experimental branch to the mainline.

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Revision Control Systems

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	Aegis
	GNU Arch
	Bitkeeper
	CVS
	Darcs
	MS Visual SCCS
	Perforce
	RCS
	SVN
	And many more.

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GNU Arch key features

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	Multiuser safe - full isolation on archive transations.
	Distributed operation
		Multiple repositories are supported by the core.
		Merging and branching across repositories is the expected norm of operation.
	Powerful merging features.
	Multiple repository access protocols
		HTTP with webDAV (vanilla apache for instance).
		HTTP without webDAV.
		SFTP
		FTP
		Unix file access.
	Local and remote archive access's
	Robust repository format.
	Automated changelog generation.
	Some Configuration managment assistance.
	Integrated mirror facilities.

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GNU Arch Resources

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	Home page: http://regexps.srparish.net/www/
	GNU Arch project page: http://www.gnu.org/directory/GNU/arch.html
	Mailing lists: http://savannah.gnu.org/mail/?group=gnu-arch
	Tutorial: http://regexps.srparish.net/tutorial-tla/arch.html
	Wiki: http://gnuarch.org/
	List of repositories: http://gnuarch.org/bin/view/Main/ArchiveRegistry

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History

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	Created by Tom Lord.
	Prototyped in sh.
	Rewritten C.
	Speed optimisations just appearing now.
		'Whats changed' on squid-3 < 3 seconds.
	User interface sugar from third parties:
		Tlator (GTK GUI).
		viewArch (web interface to repositories).

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Usage styles

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Arch is flexible... two common styles of usage:
	End user tracking a branch
		tla register-archive <location>
		tla get <branch> <local dir>
	End user doing adhoc patches
		(optional) tla make-archive --mirror-from <location> <local mirror dir>
		tla make-category -A <users-archive> <project-category>
		tla make-branch <users-archive>/<project-category>--<branchforpatches>
		tla make-version <users-archive>/<project-category>--<branchforpatches>--<version>
		tla tag <upstream-branch>  <users-archive>/<project-category>--<branchforpatches>--<version>
		tla get <users-archive>/<project-category>--<branchforpatches>--<version> <local dir>
		<hack>
		tla commit
		<hack>
		...
	

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Questions and demo

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