DOCSLIB.ORG

SVN Pilot: CVS Replacement

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
SVN Pilot: CVS Replacement SVN Pilot: CVS Replacement Manuel Guijarro Jonatan Hugo Hugosson Artur Wiecek David Horat Jonathan Brugge Michel Manent September 2008 CERN - IT Department CH-1211 Genève 23 Switzerland www.cern.ch/it Outline • Introduction • Motivation • Subversion • Objectives • Performance Tests • Security • IlImplemen ttitation • Questions CERN - IT Department CH-1211 Genève 23 Switzerland 2 www.cern.ch/it Version Control Systems • Maintain current and historical versions of files and data (source code) • There are many commercial and Open SVCSSource VC Systems: – (Centralised) CVS/SVN – (Distributed) GIT, Bazaar, Darcs, GNU arch, Mercurial, Monotone, etc – But subversion seems to be the most popular one (used by GCC, Phyton, PuTTY, Apache, GNOME, KDE , etc) • Physics User Community: (IN2P3, ROOT, CERN - IT Department Totem.. ) CH-1211 Genève 23 Switzerland 3 www.cern.ch/it CERN Central CVS Service • Hosts over 330 Software Projects – 29 for Atl as – 46 for CMS – 8 for LHCb,….. • Over 3000 developers registered • Over 90 GBytes of source code • Creates 250 Remedy tickets per year • Over 100000 commits per month CERN - IT Department CH-1211 Genève 23 Switzerland 4 www.cern.ch/it CERN Central CVS Service CERN - IT Department CH-1211 Genève 23 Switzerland www.cern.ch/it Central CVS service features • High Availability and Load Balancing • Web interface to repositories • Usage Statistics • Repository Remote Replication + Mirroring • Daily archive of Repositories and DR • Developers Mailing list • P/PtCPre/Post Commit itAti Actions (suc h us e-mail notification, etc) • Various access method (ssh/kerberos) • Role spp(lit (CVS Admin/Librarian/Develo p)per) CERN - IT Department CH-1211 Genève 23 Switzerland 6 www.cern.ch/it Motivation for SVN Pilot • Originally designed to host less than 100 projects • Requests to provide a central SVN service: – From CMS – From ATLAS (case study in 2006) – And from many others • CVS is over 20 years old while SVN is this millennium technology • Requests for Read Access control CERN - IT Department CH-1211 Genève 23 Switzerland www.cern.ch/it SVN vs. CVS Feature SVN CVS Speed Faster Slower Permission Full Limited File types All Limited Off line operations Yes No Repository format Database File system Locks No Yes Atomic commits Yes No CERN - IT Department CH-1211 Genève 23 Switzerland 8 www.cern.ch/it New Features (SVN 1.5) • Automatic update of working copy • Merge tracking – Subversion keeps track of what changes have bdhbeen merged where • Sparse checkouts • Interactive conflict resolution CERN - IT Department CH-1211 Genève 23 Switzerland 9 www.cern.ch/it Pilot Objectives • Provide current CVS service features • Add new features (available with SVN) – Control Read access per path (module) – Authenticated Web access – Binary files handling • Ease CVS to SVN migration • Improved usage statistics (SVN Stats) • Handlinggppp of first line support via the Help Desk • Delegate administrative tasks to Software Librarians of each project • Prevent uncontrolled setup of SVN servers • Manpppjower: 1.2 FTE project CERN - IT Department CH-1211 Genève 23 Switzerland www.cern.ch/it Timetable Feb • Preliminary study 2008 May • CVS librarians feedback 2008 July • SVN Pilot 2008 • SVN service in production Dec • CVS to SVN migration 2008 Dec • CVS service close down 2009 CERN - IT Department CH-1211 Genève 23 Switzerland 11 www.cern.ch/it SVN Pilot study • Access methods – https – ssh • Shared storage – NFS 3/4 – AFS • Securing service – Restricted Shell – Chrooted hooks ((p)commit scripts) • Infrastructure: – Librarian tools, Statistics, Web Interface,… CERN - IT Department CH-1211 Genève 23 Switzerland 12 www.cern.ch/it Performance Tests • SVN check out of a 110 Mb project • Parameters – AFS/NFS3/NFS4 – HTTPS/SSH CERN - IT Department CH-1211 Genève 23 Switzerland 13 www.cern.ch/it AFS vs NFS3 (1 server) CERN - IT Department CH-1211 Genève 23 Switzerland 14 www.cern.ch/it AFS vs NFS4 (1 server) CERN - IT Department CH-1211 Genève 23 Switzerland 15 www.cern.ch/it AFS vs NFS4 (3 servers) CERN - IT Department CH-1211 Genève 23 Switzerland 16 www.cern.ch/it Preliminary Conclusions • AFS much faster than NFS • SSH much faster than https • SSH scales very well with high load • … • New tests ongoing (with mixture of read and write operations) CERN - IT Department CH-1211 Genève 23 Switzerland 17 www.cern.ch/it Security • Project Isolation • Windows/Linux clients • Worldwide access • Shared file system independent • Hooks executed on servers • Librarians may put any script into the hooks • Librarians might need file system level access to repository – being studied Security risk!! CERN - IT Department CH-1211 Genève 23 Switzerland 18 www.cern.ch/it Hooks (scripts) Client Server Svn commit Pre-commit hook is executed Post commit hook is executed SVN: Commit OK Email notification recieved CERN - IT Department CH-1211 Genève 23 Switzerland 19 www.cern.ch/it Hook scripts chrooted: Server svnserer Librarian hooks: jailed hooks/post-commit hook Usr-hooks/post- commit hook Repository (1) Repositories System files CERN - IT Department CH-1211 Genève 23 Switzerland 20 www.cern.ch/it Architecture • svn.cern.ch (rw) – SdbiSecured subversion server (only ssh) – Read and write access to repository • svnwebcernch(ro)svnweb.cern.ch (ro) – User documentation – PjProjec t reques t – SVN web interface – Usage s ta tis tics CERN - IT Department CH-1211 Genève 23 Switzerland 21 www.cern.ch/it Pilot Implementation Summary • SSH access for SVN clients – Res tr ic te d s he ll for a ll SVN c lien ts – Hooks chrooted • SVN web (ro) – Web interfaces: websvn, trac – SSO Authenticated access • Administration delegated to librarian – Access rights – Hooks – Admin tools CERN - IT Department CH-1211 Genève 23 Switzerland 22 www.cern.ch/it Conclusions • Secure service • This will replace CSCVS by end o f 2009 • The service is supported (pre-production) • Pilot setup may differ from final setup – Access method, Web interface, shared file system, etc. – Changgpes will be transparent to the users CERN - IT Department CH-1211 Genève 23 Switzerland 23 www.cern.ch/it Support http://cern.ch/svn –Try the pilot –Documentation Svn. [email protected] CERN - IT Department CH-1211 Genève 23 Switzerland 24 www.cern.ch/it Questions? Thank s F or Li s ten ing…. M. Guijarro, A. Wiecek, David Horat, Jonathan Bugge, M. Manent, H. Hugosson CERN - IT Department CH-1211 Genève 23 Switzerland 25 www.cern.ch/it.
Load more

Recommended publications
  • Efficient Algorithms for Comparing, Storing, and Sharing
    EFFICIENT ALGORITHMS FOR COMPARING, STORING, AND SHARING LARGE COLLECTIONS OF EVOLUTIONARY TREES A Dissertation by SUZANNE JUDE MATTHEWS Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY May 2012 Major Subject: Computer Science EFFICIENT ALGORITHMS FOR COMPARING, STORING, AND SHARING LARGE COLLECTIONS OF EVOLUTIONARY TREES A Dissertation by SUZANNE JUDE MATTHEWS Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, Tiffani L. Williams Committee Members, Nancy M. Amato Jennifer L. Welch James B. Woolley Head of Department, Hank W. Walker May 2012 Major Subject: Computer Science iii ABSTRACT Efficient Algorithms for Comparing, Storing, and Sharing Large Collections of Evolutionary Trees. (May 2012) Suzanne Jude Matthews, B.S.; M.S., Rensselaer Polytechnic Institute Chair of Advisory Committee: Dr. Tiffani L. Williams Evolutionary relationships between a group of organisms are commonly summarized in a phylogenetic (or evolutionary) tree. The goal of phylogenetic inference is to infer the best tree structure that represents the relationships between a group of organisms, given a set of observations (e.g. molecular sequences). However, popular heuristics for inferring phylogenies output tens to hundreds of thousands of equally weighted candidate trees. Biologists summarize these trees into a single structure called the consensus tree. The central assumption is that the information discarded has less value than the information retained. But, what if this assumption is not true? In this dissertation, we demonstrate the value of retaining and studying tree collections.
    [Show full text]
  • Distributed Configuration Management: Mercurial CSCI 5828 Spring 2012 Mark Grebe Configuration Management
    Distributed Configuration Management: Mercurial CSCI 5828 Spring 2012 Mark Grebe Configuration Management Configuration Management (CM) systems are used to store code and other artifacts in Software Engineering projects. Since the early 70’s, there has been a progression of CM systems used for Software CM, starting with SCCS, and continuing through RCS, CVS, and Subversion. All of these systems used a single, centralized repository structure. Distributed Configuration Management As opposed to traditional CM systems, Distributed Configuration Management Systems are ones where there does not have to be a central repository. Each developer has a copy of the entire repository and history. A central repository may be optionally used, but it is equal to all of the other developer repositories. Advantages of Distributed Configuration Management Distributed tools are faster than centralized ones since metadata is stored locally. Can use tool to manage changes locally while not connected to the network where server resides. Scales more easily, since all of the load is not on a central server. Allows private work that is controlled, but not released to the larger community. Distributed systems are normally designed to make merges easy, since they are done more often. Mercurial Introduction Mercurial is a cross-platform, distributed configuration management application. In runs on most modern OS platforms, including Windows, Linux, Solaris, FreeBSD, and Mac OSX. Mercurial is written 95% in Python, with the remainder written in C for speed. Mercurial is available as a command line tool on all of the platforms, and with GUI support programs on many of the platforms. Mercurial is customizable with extensions, hooks, and output templates.
    [Show full text]
  • Higher Inductive Types (Hits) Are a New Type Former!
    Git as a HIT Dan Licata Wesleyan University 1 1 Darcs Git as a HIT Dan Licata Wesleyan University 1 1 HITs 2 Generator for 2 equality of equality HITs Homotopy Type Theory is an extension of Agda/Coq based on connections with homotopy theory [Hofmann&Streicher,Awodey&Warren,Voevodsky,Lumsdaine,Garner&van den Berg] 2 Generator for 2 equality of equality HITs Homotopy Type Theory is an extension of Agda/Coq based on connections with homotopy theory [Hofmann&Streicher,Awodey&Warren,Voevodsky,Lumsdaine,Garner&van den Berg] Higher inductive types (HITs) are a new type former! 2 Generator for 2 equality of equality HITs Homotopy Type Theory is an extension of Agda/Coq based on connections with homotopy theory [Hofmann&Streicher,Awodey&Warren,Voevodsky,Lumsdaine,Garner&van den Berg] Higher inductive types (HITs) are a new type former! They were originally invented[Lumsdaine,Shulman,…] to model basic spaces (circle, spheres, the torus, …) and constructions in homotopy theory 2 Generator for 2 equality of equality HITs Homotopy Type Theory is an extension of Agda/Coq based on connections with homotopy theory [Hofmann&Streicher,Awodey&Warren,Voevodsky,Lumsdaine,Garner&van den Berg] Higher inductive types (HITs) are a new type former! They were originally invented[Lumsdaine,Shulman,…] to model basic spaces (circle, spheres, the torus, …) and constructions in homotopy theory But they have many other applications, including some programming ones! 2 Generator for 2 equality of equality Patches Patch a a 2c2 diff b d = < b c c --- > d 3 3 id a a b b
    [Show full text]
  • Distributed Revision Control with Mercurial
    Distributed revision control with Mercurial Bryan O’Sullivan Copyright c 2006, 2007 Bryan O’Sullivan. This material may be distributed only subject to the terms and conditions set forth in version 1.0 of the Open Publication License. Please refer to Appendix D for the license text. This book was prepared from rev 028543f67bea, dated 2008-08-20 15:27 -0700, using rev a58a611c320f of Mercurial. Contents Contents i Preface 2 0.1 This book is a work in progress ...................................... 2 0.2 About the examples in this book ..................................... 2 0.3 Colophon—this book is Free ....................................... 2 1 Introduction 3 1.1 About revision control .......................................... 3 1.1.1 Why use revision control? .................................... 3 1.1.2 The many names of revision control ............................... 4 1.2 A short history of revision control .................................... 4 1.3 Trends in revision control ......................................... 5 1.4 A few of the advantages of distributed revision control ......................... 5 1.4.1 Advantages for open source projects ............................... 6 1.4.2 Advantages for commercial projects ............................... 6 1.5 Why choose Mercurial? .......................................... 7 1.6 Mercurial compared with other tools ................................... 7 1.6.1 Subversion ............................................ 7 1.6.2 Git ................................................ 8 1.6.3
    [Show full text]
  • DVCS Or a New Way to Use Version Control Systems for Freebsd
    Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions DVCS or a new way to use Version Control Systems for FreeBSD Ollivier ROBERT <[email protected]> BSDCan 2006 Ottawa, Canada May, 12-13th, 2006 Ollivier ROBERT <[email protected]> DVCS or a new way to use Version Control Systems for FreeBSD Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions Agenda 1 Brief history of VCS 2 FreeBSD context & gures 3 Is Arch/baz suited for FreeBSD? 4 Mercurial to the rescue 5 New processes & policies needed 6 Conclusions Ollivier ROBERT <[email protected]> DVCS or a new way to use Version Control Systems for FreeBSD Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions The ancestors: SCCS, RCS File-oriented Use a subdirectory to store deltas and metadata Use lock-based architecture Support shared developments through NFS (fragile) SCCS is proprietary (System V), RCS is Open Source a SCCS clone exists: CSSC You can have a central repository with symlinks (RCS) Ollivier ROBERT <[email protected]> DVCS or a new way to use Version Control Systems for FreeBSD Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions CVS, the de facto VCS for the free world Initially written as shell wrappers over RCS then rewritten in C Centralised server Easy UI Use sandboxes to avoid locking Simple 3-way merges Can be replicated through CVSup or even rsync Extensive documentation (papers, websites, books) Free software and used everywhere (SourceForge for example) Ollivier ROBERT <[email protected]> DVCS or a new way to use Version Control Systems for FreeBSD Brief history of VCS FreeBSD context & gures Is Arch/baz suited for FreeBSD? Mercurial to the rescue New processes & policies needed Conclusions CVS annoyances and aws BUT..
    [Show full text]
  • GIT—A Stupid Content Tracker
    GIT—A Stupid Content Tracker Junio C. Hamano Twin Sun, Inc. [email protected] Abstract The paper gives an overview of how git evolved and discusses the strengths and weaknesses of its design. Git was hurriedly hacked together by Linus Torvalds, after the Linux kernel project lost its license to use BitKeeper as its source code management system (SCM). It has since 1 Low level design quickly grown to become capable of managing the Linux kernel project source code. Other projects have started to replace their existing Git is a “stupid content tracker.” It is designed SCMs with it. to record and compare the whole tree states ef- ficiently. Unlike traditional source code control Among interesting things that it does are: systems, its data structures are not geared to- ward recording changes between revisions, but for making it efficient to retrieve the state of in- 1. giving a quick whole-tree diff, dividual revisions. 2. quick, simple, stupid-but-safe merge, The unit in git storage is an object. It records: 3. facilitating e-mail based patch exchange workflow, and • blob – the contents of a file (either the 4. helping to pin-point the change that caused contents of a regular file, or the path a particular bug by a bisection search in pointed at by a symbolic link). the development history. • tree – the contents of a directory, by recording the mapping from names to ob- The core git functionality is implemented as a jects (either a blob object or a tree object set of programs to allow higher-layer systems that represents a subdirectory).
    [Show full text]
  • Version Control Key Points ======
    Version Control Key Points ========================== Mike Jackson, The Software Sustainability Institute. This work is licensed under the Creative Commons Attribution License. Copyright (c) Software Carpentry and The University of Edinburgh 2012. See http://software-carpentry.org/license.html for more information. Derived from Chris Cannam's original at, https://code.soundsoftware.ac.uk/projects/easyhg/wiki/SC2012BootcampPl an. .. Written in reStructuredText, http://docutils.sourceforge.net/rst.html. Prerequisites ------------- Mercurial, BitBucket. Introduction ------------ Cover VersionControl.ppt, slides 1-2. Use Mercurial command-line. EasyMercurial GUI as a visually appealing alternative - once the concepts are understood. Create a repository directory and add a file -------------------------------------------- hg and Mercury. Set an editor for providing commit messages e.g. nano. :: export EDITOR=nano Or xemacs :: export EDITOR=xemacs Or vi. :: export EDITOR=vi Create repository. :: hg init hg status file.txt "?" means repository does not know about it. :: hg add file.txt hg status file.txt "A" means repository has scheduled it for addition but not yet added it. :: hg commit file.txt abort: no username supplied message /home/user/.hgrc file contains common settings. :: [ui] username = Boot Camp <[email protected]> :: hg commit file.txt Commit message records "why" changes were made. "made a change" messages are redundant. "Commit 1, 2..." messages are redundant. Messages must have meaning to others who may read them (or the original author 6 months from now). :: hg status file.txt No information means repository knows about it and it's up-to-date. .hgignore can record files to ignore e.g. ~ files, .o files, .class files etc. :: syntax: glob *~ Add to repository.
    [Show full text]
  • Darcs 2.0.0 (2.0.0 (+ 75 Patches)) Darcs
    Darcs 2.0.0 (2.0.0 (+ 75 patches)) Darcs David Roundy April 23, 2008 2 Contents 1 Introduction 7 1.1 Features . 9 1.2 Switching from CVS . 11 1.3 Switching from arch . 12 2 Building darcs 15 2.1 Prerequisites . 15 2.2 Building on Mac OS X . 16 2.3 Building on Microsoft Windows . 16 2.4 Building from tarball . 16 2.5 Building darcs from the repository . 17 2.6 Building darcs with git . 18 2.7 Submitting patches to darcs . 18 3 Getting started 19 3.1 Creating your repository . 19 3.2 Making changes . 20 3.3 Making your repository visible to others . 20 3.4 Getting changes made to another repository . 21 3.5 Moving patches from one repository to another . 21 3.5.1 All pulls . 21 3.5.2 Send and apply manually . 21 3.5.3 Push . 22 3.5.4 Push —apply-as . 22 3.5.5 Sending signed patches by email . 23 3.6 Reducing disk space usage . 26 3.6.1 Linking between repositories . 26 3.6.2 Alternate formats for the pristine tree . 26 4 Configuring darcs 29 4.1 prefs . 29 4.2 Environment variables . 32 4.3 General-purpose variables . 33 4.4 Remote repositories . 34 3 4 CONTENTS 4.5 Highlighted output . 36 4.6 Character escaping and non-ASCII character encodings . 36 5 Best practices 39 5.1 Introduction . 39 5.2 Creating patches . 39 5.2.1 Changes . 40 5.2.2 Keeping or discarding changes . 40 5.2.3 Unrecording changes .
    [Show full text]
  • Hg Mercurial Cheat Sheet Serge Y
    Hg Mercurial Cheat Sheet Serge Y. Stroobandt Copyright 2013–2020, licensed under Creative Commons BY-NC-SA #This page is work in progress! Much of the explanatory text still needs to be written. Nonetheless, the basic outline of this page may already be useful and this is why I am sharing it. In the mean time, please, bare with me and check back for updates. Distributed revision control Why I went with Mercurial • Python, Mozilla, Java, Vim • Mercurial has been better supported under Windows. • Mercurial also offers named branches Emil Sit: • August 2008: Mercurial offers a comfortable command-line experience, learning Git can be a bit daunting • December 2011: Git has three “philosophical” distinctions in its favour, as well as more attention to detail Lowest common denominator It is more important that people start using dis- tributed revision control instead of nothing at all. The Pro Git book is available online. Collaboration styles • Mercurial working practices • Collaborating with other people Use SSH shorthand 1 Installation $ sudo apt-get update $ sudo apt-get install mercurial mercurial-git meld Configuration Local system-wide configuration $ nano .bashrc export NAME="John Doe" export EMAIL="[email protected]" $ source .bashrc ~/.hgrc on a client user@client $ nano ~/.hgrc [ui] username = user@client editor = nano merge = meld ssh = ssh -C [extensions] convert = graphlog = mq = progress = strip = 2 ~/.hgrc on the server user@server $ nano ~/.hgrc [ui] username = user@server editor = nano merge = meld ssh = ssh -C [extensions] convert = graphlog = mq = progress = strip = [hooks] changegroup = hg update >&2 Initiating One starts with initiate a new repository.
    [Show full text]
  • Bazaar, Das DVCS
    Bazaar, das DVCS Marek Kubica 20. November 2008 Marek Kubica Bazaar, das DVCS Vorweg ein paar Infos Mit was ich so spiele Bazaar in der Arbeit Mercurial für Python-Projekte Git für den Rest Welche Spielzeuge lass ich links liegen CVS wozu noch wo es SVN gibt? SVN wozu noch wenn es DVCS gibt? darcs lohnt sich nicht mehr monotone, codeville, arch obsolete das selbsgehackte, tolle DVCS deines Nachbarn ;) Marek Kubica Bazaar, das DVCS Geschichte In the beginning, there was GNU Arch Marek Kubica Bazaar, das DVCS GNU Arch Die Anfänge von DVCS CVS stinkt, wir brauchen was besseres SVN ist Evolution, keine Revolution GNU Arch war das erste DVCS mit dem ich in Kontakt kam (larch) fürchterlich kompliziert wurde dann von tla ersetzt immer noch fürchterlich Canonical hat tla 1.2 geforkt und Bazaar, baz genannt Paralell dazu: revc = Arch 2.0 Marek Kubica Bazaar, das DVCS Baz als Rettung? Von heiÿen Kartoeln baz war in C Was passiert: Canonical ruft Bazaar-NG ins Leben, bzr, lässt baz fallen Bazaar-NG wird in Bazaar umgetauft baz ist tot, tla ist tot, larch ist tot, revc ist bedeutungslos Hurra, GNU Arch ist endlich tot, es lebe bzr! Marek Kubica Bazaar, das DVCS bzr, der Retter Was bietet Bazaar? in Python geschrieben, mit einigen Speedups in Pyrex (C) reguläre Releases (quasi jeden Monat) Einfache Bedienung Meist ausreichende Performance Umfangreiche Dokumentation: Programmmeldungen, Manpages, Wiki, IRC-Channel (wenn man Geduld hat) Flexible Einsatzmöglichkeiten (verschiedene Workows) 1 Git mit Bazaar simulieren 2 SVN in Bazaar nachbauen (für Nostalgiker) freier Hoster wo man Code hochladen kann (Launchpad) Marek Kubica Bazaar, das DVCS Zeitleiste 2005 war eine aufregende Zeit 26.
    [Show full text]
  • Everything You Need to Know About Openjdk's Move to Git and Github
    Menu Topics Archives Downloads Subscribe Everything you need to know JAVA 17 about OpenJDK’s move to Git and GitHub Everything you need to know Blame or thank BitKeeper about OpenJDK’s move to Git Why not Mercurial? and GitHub Why Git? Why GitHub? Why the move, and why now? The move from Mercurial to Git Getting the source code and provided an opportunity to consolidate building the OpenJDK the source code repositories. Conclusion by Ian Darwin Dig deeper May 14, 2021 Download a PDF of this article Have you ever built your own Java Development Kit from source? Most end users of the JDK will not need to build their own JDK from the Oracle source code. I’ve needed to do that only a few times when I was running on the OpenBSD UNIX-like system, which is not one of the three supported platforms. Sure, you might want to build your own JDK to try out a new feature that you think should be added to Java. You might choose to build from source to be sure you are running a more trustworthy binary. Having the complete source code readily available, and now in a more commonly used download format, means it is easier than ever to build your own JDK. Yes, it’s a better-documented, easily configured process than in the past. But it’s still a bit confusing. The source code for the OpenJDK recently moved from the Mercurial version control system (VCS) to the Git VCS and the GitHub repository system, and that’s probably a good thing.
    [Show full text]
  • Analysis and Comparison of Distributed Version Control Systems
    Fachhochschul-Bachelorstudiengang SOFTWARE ENGINEERING A-4232 Hagenberg, Austria Analysis and Comparison of Distributed Version Control Systems Bachelorarbeit Teil 1 zur Erlangung des akademischen Grades Bachelor of Science in Engineering Eingereicht von Daniel Knittl-Frank Begutachter: DI Dr. Stefan Wagner Hagenberg, Juni 2010 Contents Abstract iii Kurzfassung iv 1 Introduction1 1.1 Motivation............................1 1.2 Goals...............................2 1.3 Content..............................2 2 Version Control in General3 2.1 Workflows.............................4 2.2 Foundations............................5 2.2.1 Glossary..........................5 2.2.2 Repository........................6 2.2.3 Working Directory....................7 2.2.4 Diff and Patch......................7 2.2.5 Merge...........................9 2.2.6 Mainline, Branches and Tags.............. 12 3 Centralized Version Control 14 3.1 Tools................................ 14 3.1.1 CVS............................ 14 3.1.2 Subversion........................ 15 4 Distributed Version Control 17 4.1 Differences............................. 17 4.2 Concepts............................. 19 4.2.1 Revision identifiers.................... 20 4.2.2 Integrity.......................... 20 4.2.3 History representation.................. 21 4.3 Tools................................ 21 4.3.1 Bazaar........................... 22 4.3.2 Git............................. 27 4.3.3 Mercurial......................... 32 i Contents ii 5 Comparison 38 5.1 Testing Scenario......................... 38 5.2 Results............................... 38 6 Conclusion 46 Abstract Version and configuration control systems have played an essential role in software development for the last decades. Starting with the new millennium a new trend surfaced, distributed version control: dedicated central servers for few authorized users lose importance in favor of a more dynamic workflow, in which every developer works with a copy of a project's complete history and changes are synchronized ad-hoc between developers.
    [Show full text]